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International Association of Lowland Technology In Collaboration with Hasanuddin University and Saga University Address Faculty of Engineering, Center of Technology Building, 1st Floor Jalan Poros Malino km. 6, Bontomarannu, Gowa Indonesia Postal Code: 91711
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Lowland Technology International
Published by International Association of Lowland Technology
ISSN : 13449656     EISSN : 21878870     DOI : https://doi.org/10.0001/ialt_lti
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering Transportation
The Lowland Technology International Journal presents activity and research developments in Geotechnical Engineering, Water Resources Engineering, Structural Engineering, Transportation Engineering, Urban Planning, Coastal Engineering, Disaster Prevention and Mitigation Engineering.
Arjuna Subject : Teknik (semua kategori) - Teknik Sipil dan Struktur
Articles 463 Documents
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EFFECT OF DRAINAGE GALLERY DIMENSIONS ON THE UPLIFT FORCE OF A GRAVITY DAM M. A. El-Razek; M. M. A. Elela
Lowland Technology International Vol 4 No 2, Dec (2002)
Publisher : International Association of Lowland Technology

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Abstract

Uplift pressure on the floor of the gravity dam affects the stability of the dam. Therefore minimazing the uplift pressure force can be achieved by constructing a drainage gallery. In the present work, three parameters of the drainage gallery are studied experimentally on a sand model of gravity dam to determine their effect on the total uplift force acting on the floor of the dam. These parameters are the diameter of the drainage gallery (d), spacing of the drainage gallery in the longitudinal direction of the dam (L), and the penetration depth (h). It is found that, the penetration depth of the drainage gallery is more effective in reducing the uplift force than the other two parameters. The average values of reduction in the uplift force attributed to the change of d, L, and h accounted to about 11%, 25%, and 40% respectively.
FIELD PROPERTIES AND SETTLEMENT CALCULATION OF SOIL-CEMENT COLUMN IMPROVED SOFT SUBSOIL - A CASE STUDY J. C. Chai; S. Y. Liu; Y. J. Du
Lowland Technology International Vol 4 No 2, Dec (2002)
Publisher : International Association of Lowland Technology

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Abstract

The unconfined compression strength, standard penetration test (SPT) results for soil-cement columns and the field loading tests results of the composite subsoil at Lian-Yun-Gang section, Xu - Lian expressway, China, were presented. The Methods for calculating the settlement of the soil-cement column improved soft subsoil were discussed. It is recommended that the stiffness of the "slab" on the top of the improved subsoil should be flexible "slab". the equilibrium method for the improved layer and the average stress method for the underlying unimproved soft layer are prefered, while in the case of a stiff "slab", the average modulus method for the improved layer and the combined method for the underlying unimproved layer are prefered. Finally, the settlements of the soil-cement column improved subsoil at Lian-Yun-Gang section were evaluated by the suggested methods and compared with the field data. The stress concentration ratio (n) is back-calculated, and it showed that n value increased with the increased of the area replacement ratio.
GEOTECHNICAL HAZARDS IN BANGKOK - PRESENT AND FUTURE S. Shibuya; S. B. Tamrakar; W. Manakul
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

Geotechnical hazards in Bangkok, the capital of Thailand, are cited with reference to floods, land subsidence and earthquakes, bearing the characteristic subsoil conditions in mind. First, geotechnical engineering works concerning the implementation of flood protection schemes are briefly outlined. Second, the cause of land subsidence, i.e., the drawdown of pore pressures in clay layer induced by water pumping in the aquifer, together with the current situations are described by showing the results of geotechnical site investigation performed recently. Finally, a risk of seismic hazard in Bangkok is roused by referring to a statement that “the surficial geologic setting at Bangkok is similar to the setting of Mexico City, and hence Bangkok, by analogy, appears to be susceptible to the same type of soil amplification of ground motions (Warnitchai et al. 2000)”.
THE INFLUENCE OF INITIAL STATIC SHEAR STRESS ON POST-CYCLIC DEGRADATION OF NON-PLASTIC SILT B.- W. Song
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

Using a sequential procedure of cyclic and post-cyclic direct simple shear (DSS) tests, the strength and stiffness degradation characteristics of non-plastic silt were studied during and immediately after cyclic loading. The postcyclic degradations of strength and stiffness were considered with special reference to the effects of initial static shear stress (ISSS). The findings obtained from sequential DSS testing on non-plastic silt are: (1) strength and stiffness degradation characteristics of non-plastic silt during post-cyclic loading depend on the increase of the normalized pore pressures generated during cyclic loading, which is more marked with increasing ISSS; (2) degradation of stiffness is particularly to ISSS; (3) post-cyclic degradation relations of strength and stiffness for non-plastic silt formulated against cyclic-induced excess pore pressure should include the influence of ISSS. The methods formulated for predicting post-cyclic strength and stiffness take the effect of ISSS into consideration.
PREDICTION MODEL OF INUNDATION IN PUMPED-FIELD LOWLANDS AND SCENARIOS FOR IMPROVING ITS PERFOMANCE N. Cao Don; H. Araki; H. Yamanishi; K. Koga
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

During rainy season, frequent flooding by strom water is one of the most serious problems in lowland areas, causing heavy effect on transportation, agriculture, industry, and economic activities. As a result, the required drainage water levels in this area are generally lower than the water levels of boundary rivers. Under such circumstances, pumping system should be designed from a viewpoint of integrated control floods. The Nam Ha lowland, in Vietnam, bounded by four surrounding rivers, is selected as a case study. The operation scheme in this area is a key factor for drainage and flood protection. This developed mathematical model can be used as a tool to evaluate the present drainage system as well as flooding processes in the field as well as inundation areas and water levels along drainage channels. It is found that the proposed model can be applied to evaluate integrated flood control system for pumped-field lowland. Such an operating system provides an effective tool by means of which the drainage system can be operated appropriately taking into account of tidal effects, rainfall intensity, and reaching time of the rainwater.
INSTABILITY OF COASTAL LOWLANDS DUE TO SEISMIC ACTIVITIES H. B. Poorooshasb
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

In certain regions of the world the coastal lowlands consist of a two to three meters of impervious material supported by a layer of sand and underlain by a thick layer of stiff marine clay. One such region is in the vicinity of the City of Bushire (Bushehr) located in the northern shores of the Persian Gulf. Here the top layer is a two to three meter thick coquina layer, resting on a very loose sand deposit of almost constant thickness (about 50-60 cm) having a gentle slope of about 5-10 degrees towards the sea. A sever earthquake in this region several centuries ago completely destroyed the City of Siraf which, at the time, was the most important port of the Persian Gulf on the Silk Route. The present paper presents an analysis of the situation using the CANAsand Constitutive Model and the ID technique proposed by the Author and his Colleagues at Institute of Lowland Technology, Saga University, Poorooshasb et al (1996).
DISASTERS AND ENVIRONMENTAL MANAGEMENT IN THE DONGTING LAKE LOWLANDS R.– L. Yin; D.- X. Shen; Z.- G. Che
Lowland Technology International Vol 5 No 1, June (2003)
Publisher : International Association of Lowland Technology

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Abstract

Dongting Lake is one of the most important freshwater lakes in China. There is a dense population and richresources in the lake region that is also an important natural ecological system. The Dongting Lake lowlands have always been a serious flood disaster region, and human activities have impacted negatively on the ecological environment. In response, the Chinese government has adopted a series of structural and non-structural measures, resulting in mitigation of flooding disasters and improving the environmental protection in the lake region.
ANALYSIS OF SHORT RIGID CAISSONS WITH GRANULAR CORE FOR ALLUVIAL LOWLANDS S. M. Ali Jawaid; Madhira R. R. Madhav
Lowland Technology International Vol 5 No 2, Dec (2003)
Publisher : International Association of Lowland Technology

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Abstract

A new composite foundation is being proposed for foundations in saturated loose alluvial deposits. A simplified theoretical approach using linear Winkler type responses, is presented in this paper for the analysis of the proposed foundation. Extensive parametric studies in terms of load sharing and settlement reduction as functions of various parameters, e.g. length to diameter ratio and inner to outer diameter ratio of the caisson, Poission’s ratios of soil and granular core material, relative stiffnesses of core, shear and bearing stiffnesses, are presented to predict the response of the composite foundation.
APPLICATION OF ARTIFICIAL NEURAL NETWORK FOR WATER QUALITY MANAGEMENT I. Zaheer; C. - G. Bai
Lowland Technology International Vol 5 No 2, Dec (2003)
Publisher : International Association of Lowland Technology

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Abstract

A new artificial neural network based on decision-making approach for water quality management to control environmental pollution is presented. Previous research on water quality management problems has shown that traditional optimization techniques and an expert-system approach do not provide an educated solution comparing with decision making approach, which is related to the interpretation of data based on certain set of rules. Under such conditions, the Artificial Neural Network (ANN) learns the rule governing the decision-making through a series of experiments. In the present study, ANN was used to evaluate the relative effects of various pollution sources on the quality of river water. Using a backpropagation algorithm of a feed forward neural network, the relative effects of pollution sources were evaluated for strategic planning of water quality management. The case study for the Hanjiang River of China was selected to demonstrate the procedure and performance of a neural network-based approach for analysis and discussion.
BEHAVIOR OF MICROPILE FOUNDATIONS UNDER INCLINED LOADS IN LABORATORY TESTS G. - L. You; K. Miura; M. Ishito
Lowland Technology International Vol 5 No 2, Dec (2003)
Publisher : International Association of Lowland Technology

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Abstract

Subsequent to the model investigation of the load bearing mechanism of micropile foundations in sand under vertical loads, this model study aims to further investigate the load bearing behavior of micropile foundations under inclined loads in sand. Three series of model tests (footing, micropile, and micropile foundation tests, respectively) are conducted in very dense sand (Dr = 95 ± 3%) under three different load inclinations (k = Ph/P = 0.3, 0.6, and 0.9, respectively). The test results under inclined loads are comparatively analyzed using the results of the vertical loading tests (k =0.0), and discussed in terms of displacements, coefficients of subgrade reaction, and the network effect index. It is found that micropiles can effectively improve the bearing capacity of surface footings under inclined loads. However, as expected, the improvement of bearing capacity decreases with the load inclination. A positive network effect is observed in the model tests under inclined loads as in the vertical loading tests in previous studies. The network effect index, R increases gradually with settlement under different load inclinations; at a large settlement, a network effect index of 1.2 is obtained in inclined loading tests. It is found that the footing in the early loading stage tends to move toward the vertical direction in the footing tests under inclined loads, while the opposite results are observed in the micropile tests. The vertical coefficient of subgrade reaction of micropile foundations is higher than those of footings and micropiles, and its horizontal coefficient is more than twice of that of micropiles at k = 0.3. This indicates that the surface footing not only plays a role in load bearing, but also makes a remarkable contribution in positively mobilizing the interaction among footing, micropiles, and subsoil. The bearing capacity of micropile foundations is larger at small battered angles of micropiles under inclined loadings, and it decreases at large battered angles. Consequently, the coefficient of vertical subgrade reaction decreases with the battered angle in micropile foundation tests. On the other hand, the horizontal coefficient increases with the battered angle up to 45°.

Page 12 of 47 | Total Record : 463

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