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OPTIMASI LERENG TERASERING UNTUK PENANGGULANGAN LONGSOR DENGAN ANALISIS METODE FELLENIUS mawardi mawardi
Inersia: Jurnal Teknik Sipil Vol. 12 No. 1 (2020)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.12.1.37-44

Kawasan Pembangkit Listrik Tenaga Air (PLTA) Musi Kabupaten Kepahiang merupakan kawasan perbukitan yang memiliki lereng-lereng curam yang rawan terhadap kelongsoran. Salah satu peristiwa longsor terjadi pada awal bulan Oktober 2017 tepatnya terjadi di jalan lintas antara Desa Susup Kabupaten Bengkulu Tengah dan Kecamatan Ujan Mas Kabupaten Kepahiang. Penelitian ini bertujuan untuk menganalisisa stabilitas lereng terasering dengan menggunakan Metode Fellenius. Hasil pengujian sifat fisis tanah menunjukan bahwa tanah pada lereng dikawasan PLTA Musi Kepahiang adalah tanah lempung. Lereng yang diteliti di kawasan PLTA Musi semuanya rawan terhadap kelongsor karena faktor keamanan, FK < 1,5. Berdasarkan hasil penelitian pada lereng 1 tipe lereng yang paling aman nilai faktor keamanan adalah tipe lereng terasering trap 3 kemiringan 19o, FK = 1,61 lebih besar dari nilai faktor keamanan tipe lereng terasering trap 2 kemiringan 19o, FK = 1,57 dan nilai faktor keamanan tipe lereng aman kemiringan 19o, FK = 1,519 serta nilai faktor keamanan tipe lereng asli kemiringan 30o, FK = 0,88.Kata Kunci :Metode Fellenius, Faktor keamana lereng (FK), TeraseringABSTRACTThe Musi Hydroelectric Power Plant area in Kepahiang Regency is a hilly area that has steep slopes that are prone to landslides. One of the landslides that occurred at October 2017 precisely occurred on a highway between Susup Village, Bengkulu Tengah Regency and Ujan Mas District, Kepahiang Regency. This study aims to analyze the slope stability of the terraces using the Fellenius Method. The results of testing the physical properties of the soil indicate that the soil on the slopes of the area of the Musi Hydroelectric Power Plant is clay. The slopes studied in the Musi hydropower area are all prone to landslides because safety factor, FK <1.5. Based on the results of the research on the slopes of the safest type 1 slope the value of the safety factor is the type of slope of the slope trap 3, 19o,FK = 1,61 greater than the safety factor value of slope type 2 slope trap 19o, FK = 1,57 and safe slope type safety factor value slope of 19o, FK = 1.519 and the value of the safety factor of the original slope type of slope 30o, FK = 0.88.Keywords: Fellenius Method, Safe Factor (SF), Terraces

ANALISIS STABILITAS LERENG MODIFIKASI- STABILISASI TANAH DENGAN PENAMBAHAN KAPUR (Studi Kasus Area Kantor Pemda Seluma) mawardi mawardi
Inersia: Jurnal Teknik Sipil Vol. 14 No. 1 (2022)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.14.1.54-62

ABSTRACTSeluma regency area often occurs landslide disaster and one of them is located in Local Government Authority Seluma area. This study aims to analyze the stability of the slope by using finite element method, so it is known that the safety factor (SF) and the soil type. The study was started by testing physical and mechanical properties of the soil, then slope stability analysis was done by finite element method program to find out FK. The result of soil physical properties test shows that the land on the slope of Local Government Authority Seluma area is clay soil. Calculation of slope stability analysis using finite element method by considering the effect of pore water to get the safest result on slope cement stabilization soil 1 Contour A, SF= 1,817 with a slope angle of 34o. The slopes studied in the Local Government Authority in Seluma Regency are all prone to landslides or unsafe because SF is < 1,5. Based on the results of the research from the safest slope, it was concluded that the value of the Safety Factor (SF) of soil stabilization of limestone was 1,817 bigger than the value of the safety Factor (SF) of soil compaction was 1,619 and the value of the safety Factor (SF) of soil compaction was 1,399 bigger than the value of the safety Factor (SF) of the original soil was 1,483.Key Words : Finite Element Method, Safety Factor, Modifications slope, Slope StabilityABSTRAKAreal Kabupaten Seluma sering terjadi peristiwa longsor dan salah satunya berada di kawasan Kantor Pemda Seluma. Penelitian ini bertujuan untuk menganalisis stabilitas lereng dengan menggunakan metode finite element, sehingga diketahui faktor keamanan (FK) dan jenis tanah. Penelitian dimulai dengan melakukan uji sifat fisis dan mekanik tanah, kemudian dilakukan analaisis stabilitas lereng dengan metode finite element untuk mengetahui FK. Hasil pengujian sifat fisis tanah menunjukan bahwa tanah pada lereng dikawasan Kantor Pemda Seluma adalah tanah lempung. Perhitungan analisis stabilitas lereng menggunakan metode finite element dengan mempertimbangkan pengaruh air pori mendapatkan hasil yang paling aman pada tanah stabilisasi Kapur lereng 1 Kontur A, FK= 1,817 dengan kemiringan sudut lereng 34o. Lereng yang diteliti di kawasan Kantor Pemda Seluma semuanya rawan longsor atau tidak aman karena FK < 1,5. Berdasarkan hasil penelitian dari lereng yang paling aman disimpulkan bahwa nilai Faktor Keamanan (FK) tanah stabilisasi Kapur adalah 1,817 lebih besar dari nilai Faktor Keamanan (FK) Tanah pemadatan adalah 1,619 dan nilai Faktor Keamanan (FK) tanah pemadatan adalah 1,619 lebih besar dari nilai Faktor Keamanan (FK) tanah asli adalah 1,483Kata Kunci : Metode Finite Element, Faktor Aman, lereng modifikasi, Stabilitas Lereng

PENGARUH PENAMBAHAN CAMPURAN SEMEN DAN ABU SEKAM PADI TERHADAP STABILISASI TANAH PADA RUAS JALAN BUDI UTOMO I Olandri Wijaya; Mawardi Mawardi; Yuzuar Afrizal
Inersia: Jurnal Teknik Sipil Vol 7, No 2 (2015)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.7.2.13-20

Research on the Effect of Mixed Addition of Cement And rice husk ash Against and Stabilization on Roads Budi Utomo I aims to determine the effect of Addition of Cement And rice husk ash and to finding the optimal mix levels of Addition of Cement And rice husk for land Stabilization. Tests conducted at the Laboratory of Engineering, University of Bengkulu and the types of tests as follows: natural water content, specific gravity, sieve analysis, atterberg limits, standard proctor,and CBR (California Bearing Ratio) laboratories. Based on laboratory testing, native land in Jalan Budi Utomo I was clay with high plasticity After testing the original soil coupled with a mixture of cement and rice husk ash obtained optimum results occur at levels of 12 % of the 4%, 8%, dan 12% variations. The following test results with a mixture of cement and rice husk ash with levels 12 % : on the CBR laboratories testing provide CBR value increase up to 148.42 % of the original soil CBR by weight of the dry contents increased up to 3.846 % of the dry weight of the contents of the original soil. The optimum moisture content decreased to 13.754 % of the original soil optimum water content, whereas soil plasticity index dropped to 50.084 % of the original soil plasticity index, and the specific gravity value of the land increased to 1.923 % of theoriginal soil. Improved stability of the soil caused by cement and rice husk ash containing silica elements where this element has a very large contribution as an adhesive and can harden by reaction with water so as to increase the strength of the soil stabilization.

NILAI CBR PADA STABILISASI TANAH DENGAN SEMEN JALAN BUDI UTOMO UNIB DEPAN mawardi mawardi; Makmun R. Razali; Olandri Wijaya
Inersia: Jurnal Teknik Sipil Vol 8, No 2 (2016)
Publisher : Universitas Bengkulu

CBR value research on soil stabilization with cement in the Budi Utomo UNIB Depan for influence soil properties and soil CBR original value after stabilisation with cement. Geotechnical Lab Testing was conducted at the Faculty of Engineering UNIB. Test laboratory soil properties include: density, water content, sieve analysis, Proctor standard test, Atterberg limits, and experimental value of CBR (California Bearing Ratio) laboratory. Stabilization soft soil made with cement with the addition of cement content of 0%, 2%, 4%, 8% and 12%. Based on test results propeties soil and the value of laboratory CBR. CBR maximum value at additioning cement content of 12%, the CBR value an increase of 144.21%, of the original soil conditions, dry density increase 3.85%, of the original soil, optimum moisture content decrease 13.75% of the original soil, PI value decresel 50.42% of the original soil, the value of specific gravity (Gs) increse 1.93% of the original soil. Stabilization with cement increasing the value of CBR, which means it will also boost the stability of the soil and will also increase the soil bearing capacity (qu). The increase in soil stabilization and soil bearing capacity proportional to the increase in the value of CBR amounted to 144.21%, this is due to the presence of silica, clay and limestone contained in the hydraulic cement is a binder.

PENGGUNAAN ABU CANGKANG SAWIT SEBAGAI PENGGANTI PADA SEBAGIAN SEMEN UNTUK MENAMBAH KEKUATAN TEKAN MORTAR Khairil Anwar; Mawardi Mawardi
Inersia: Jurnal Teknik Sipil Vol 4, No 2 (2012)
Publisher : Universitas Bengkulu

The objective of this research was to investigate the influence of palm ash powder as a substitute for a fraction of the cement to the mortar compressive strength. Palm ash constitutes as cesspool of palm production that contains a lot of silica element (SiO) and constitutes pozzolanic material. The sample used were cubes size 50 mm x 50 mm x 50 mm. Sand that used have 2 variation are mountain sand and sea sand and have 2 processing are washing and not washing. The method that used is anava 2 way. The testing object was made by composition of mixture 1 cement : 2 sand and 1 cement : 4 sand, by variation of palm ash addition on cement 0%, 7.5%, 12.5%, 25%, and 30%. By the research showed pressure strength respectively viz 38.52 MPa, 21.85 MPa, 17.10 MPa, 7.66 MPa, and 5.59 MPa. The test was conducted after the mortar was 28 days old. The test result of mortar found that higher content of the fruit bunch ash so lower of compressive mortar strength. So that the objective of this research dont have optimum percentage of palm ash to compressive strength of mortar and palm ash dont used as a subsitute for a fraction of cement to the mortar compressive strength.

THE EFFECT OF “PANDAN PANTAI” LEAF FIBER ADDITION TO CONCRETE STRENGTH Mawardi Mawardi
Inersia: Jurnal Teknik Sipil Vol 3, No 1 (2011)
Publisher : Universitas Bengkulu

There are several fibers which can be used for improving concrete properties. Such as steel fiber, fiber glass, banana fiber. The objective of this research is to know how Pandan leaf fibers Beach affects to the concrete strength. During the experiment 2.5 mm fibers were mixed to the concrete mortar. The fiber length diameter was 0.2-0.5 mm. The concrete simple size is 15 cm x 15 cm x l60 cm. The cement water factor was 0.45 –0,6. The fiber volume proportion were 0%, 1%, 2%, and 3%.It was observed that those addition increase the strength by 18%, and decrease concrete breaks

TINJAUAN BAHAYA LONGSOR LERENG DENGAN METODE FELLENIUS mawardi mawardi
Inersia: Jurnal Teknik Sipil Vol. 13 No. 2 (2021)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.13.2.89-98

ABSTRAKDaerah kawasan Kantor Pemerintah daerah Seluma, di desa Talang Saling, Kabupaten Seluma sebagai tempat studi kasus pada penelitian ini. Tempat ini merupakan kawasan perkantoran dan jalan raya perlintasan kendaraan, yang akan terus berkembang. Tujuan penelitian ini untuk mengetahuai bahaya longsor lereng dengan memodifikasi dalam beberapa variasi dengan analisis stabilitas lereng Metode Finite Elemen, Dari analisis stabilitas lereng ini maka diketahui faktor aman (FK) dan sifat fisis tanah, jenis tanah pada lereng. Metoda penelitian ini adalah penelitian eksperimen di lab dan dilapangan. Penelitian ini dimulai dengan melakukan uji sifat fisis dan mekanik tanah, kemudian dilakukan analaisis stabilitas lereng dengan program computer untuk mengetahui nilai FK. Perhitungan analisis stabilitas lereng menggunakan Program fenite elemen pada lereng terasering trap 3 pada pada lereng 1 adalah trap 3 dengan kemiringan sudut 15o didapat angka FK=1,78 >1,5 (lereng aman). Lereng 2 adalah lereng asli dengan sudut kemiringan 13o didapat FK=1 <1,5 (lereng tidak aman). Lereng 3 adalah trap 2 dengan sudut kemiringan 14o didapat FK=1,816 >1,5 (lereng aman).Kata Kunci : Metode Fenite elemen, Stabilitas Lereng, Terasering The area of the Seluma Regional Government Office, Talang Saling village, Seluma District as a case study in this study. This area is an office area and road crossing, that will continue to grow always. This study aims to analyze modified slope stability in several variations using the Finite Element, so that it is known that the safety factor (FK) and soil type – soil physic properties. The study began by conducting physical and mechanical properties of soil tests, then analyzing slope stability with the computer programs to find out the FK.. Calculation of slope stability analysis using. Calculation of slope stability analysis using Finite elemen with the effect of pore water results on the original slope 1 is terrace trap 3 with slant of 15o, FK=1,78>1,5 (safe slope). Slope 2 is original slope with slant of 13o, FK=1 >1,5 (not safe slope). Slope 3 is terrace trap 2 with slant of 14o, FK=1,816 >1,5 (safe slope).Key Words : Finite elemen Method, Safety Factor (FK), Slope Stability, Terraces

ANALISIS LERENG TERASERING DALAM UPAYA PENANGGULANGAN LONGSOR METODE FELLENIUS DENGAN PROGRAM GEOSTUDIO SLOPE Dimas Haryadi; Mawardi Mawardi; Makmun R. Razali
Inersia: Jurnal Teknik Sipil Vol 10, No 2 (2018)
Publisher : Universitas Bengkulu

The Musi Hydroelectric Power Plant area in Kepahiang Regency is a hilly area that has steep slopes that are prone to landslides. One of the landslides that occurred at October 2017 precisely occurred on a highway between Susup Village, Bengkulu Tengah Regency and Ujan Mas District, Kepahiang Regency. This study aims to analyze the slope stability of the terraces using the Fellenius Method. The results of testing the physical properties of the soil indicate that the soil on the slopes of the area of the Musi Hydroelectric Power Plant is clay. The slopes studied in the Musi hydropower area are all prone to landslides because safety factor, FK <1,5. Based on the results of the research on the slopes of the safest type 1 slope the value of the safety factor is the type of slope of the slope trap 3,19o,FK = 1,61 greater than the safety factor value of slope type 2 slope trap 19o, FK = 1,57 and safe slope type safety factor value slope of 19o, FK = 1.519 and the value of the safety factor of the original slope type of slope 30o, FK =0,88.

INOVASI MENGATASI PENDANGKALAN PADA PELABUHAN TAPAK PADERI KOTA BENGKULU mawardi mawardi
Inersia: Jurnal Teknik Sipil Vol 8, No 1 (2016)
Publisher : Universitas Bengkulu

This research give solution about problem superficiality on port Tapak Paderi, Bengkulu's city. Tapak Paderi porting Bengkulu's city is finished to be built year-end 2008, but condition now was really concerns where port pool was fraught boggy and sand, port entrance was full boggy and sand. Port auxiliary building uncompleted, eventually to build that porting deplete APBN'S fund that by dozens. Process this sedimentation begets to be troubled its city coast regiongrowing Bengkulu already dicanangkan by Bengkulu's Province local government in render Bengkulu's City as “Turism's city”. On this research is assessed how to settle superficiality causative sedimentation on port entrance. Of this research, wave high break average = 0,39 m, perioda undulates average = 8,78 seconds, corner of wave break average = 0,75 degrees, undulate speed average = 0,020 m/dt, current speed average = 0,035 m/dt, Undulate energy average = 190,79 N/m, Flux is energy average = 4,63 j/m, transport is ranging sediment average = 15,75 m3/days. Current aim of north to the south. Of this research is acknowledged that aught sediment on port entrance comes from Water river sediment Bengkulu, effect erosion and effect Stone mining smolders on river upstream. Solution that is given for about problem this is: to settle sedimentation at port entrance therefore on port entrance front assembled by upright Groyns building beaches. Groyns this will prevent its happening sedimentation on portentrance. This Groyns's building functions as building of capturing and keep all sediment who will come in to porting. Cause of in height sediment content on Water river estuary Bengkulu is because mark sense changing manner bring off forest on river upstream and marks sense upriver river coal mining.

LAND SLIDE ANALYSIS USING DIGITAL ELEVATION MODELS Mawardi Mawardi; Makmun R. Razali; Cyntia Cyntia
Inersia: Jurnal Teknik Sipil Vol 10, No 2 (2018)
Publisher : Universitas Bengkulu

Landslides almost every year occur in Indonesia, this rare landslide that can be detected early. because so far the prediction of slope slope is difficult. To predict the calculation requires the analysis and stability of the slope manually. This manual calculation process is quite long and long process. The calculation data and slope stability analysis are in the form of slope measurement, the work is quite tiring and risky for the researcher, and also the scope of the slope that can be measured is only narrow. In addition to slope inclination data, for slope analysis also requires soil data to be sampled and testing in a geotechnical laboratory. This study investigated slope stability by creating landslide models using Digital Elevation Models (DEM), and Geoslope programs. Slope model was analyzed from DEM and landslide stability analysis using Geoslope. From this concept we are expected to analyze landslide / stability slope quickly and accurately without risk for researcher. The results of lab tests were obtained:water content (wN), wN1 = 39.47%, wN1 = 40.54%, wN1 = 38.89%. Specific Soil Weight (Gs) ranged from 2.60 to 2.62, wet soil volume weight ranged from 14.59 to 16.16 kN / m3, the weight of saturated soil volume ranged from 15.59 to 16.82 kN / m3, the weight of soil volume dried ranged from 09.99 to 16.82 kN / m3, soil liquid limit ranged 61.26-66.06%, plastic limit of land ranged from 39.58 to 44.88%, soil plastic index ranged from 21.18 to 21.66, so that the soil is categorized as organic clay soil, the face of the soil at a depth of -0.5m, the cohesion value (c) ranges from 29.10 to 34.90 kPa, and the frictional angle values in the range 19.51 21.100, the slope of the slope ranges from 24 to 420 and slope safety figures (FK), on slopes 1 FK = 1.87 (slope safe against landslide hazard), on slope 2 FK = 1.20 (slope unsafe against landslide hazard), on slope 3 FK = 1.52 (the slope is safe from landslide hazards).

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