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N. Miura
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Civil Engineering, Building, Construction & Architecture Engineering Transportation

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ANALYSIS OF CULVERT APPROACHES WITH PILES OF VARYING LENGTH M. R. Madhav; P. K. Basudhar; N. Miura
Lowland Technology International Vol 1 No 1, June (1999)
Publisher : International Association of Lowland Technology

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Abstract

For the construction of culverts and their approaches on soft and highly compressible soils, an innovative approach is to provide piles with length decreasing with distance from the culvert. The equivalent stiffness of the piled strip as a function of the relative length of the piles estimated from Brown and Wiesner (1976), is bounded by Linear and exponential variations with distance. An extended Pasternak type model is proposed for the culvert approaches with piles of varying length. The response of the system is shown to be governed by the relative stiffnesses of the granular bed, the culvert foundation, the approaches at the near and far ends and the relative pile length to diameter ratio. The settlement profiles are presented for the typical values of the above parameters. The relative stiffness of the granular pad has a significant effect on settlements and on the loads transferred to the culvert foundations.
EFFECT OF BASE REINFORCEMENT ON THE BEHAVIOR OF EMBANKMENT OVER SOFT SUBSOIL C. W. Yang; J. C. Chai; N. Miura; Y. S. Ye
Lowland Technology International Vol 1 No 2, Dec (1999)
Publisher : International Association of Lowland Technology

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A case history of both reinforced and unreinforced embankments on soft subsoil built to failure is described. The results of a laboratory model test about the behavior of embankment on soft soil are referred during discussions. The effect of geotextile reinforcement on embankment behavior is discussed by comparing the field data of with and without reinforcement cases. The field data as well as analysis indicate that the reinforcement had a certain effect on embankment stability. However, at working state (normally with a factor of safety of 1.2 to 1.3), the reinforcement did not have an obvious effect on subsoil response. Only under the condition that unreinforced embankment approached to failure, the effect of reinforcement on subsoil could be noticed. The laboratory model test results indicated that if the reinforcement is strong enough, the effect of reinforcement is considerable. It is suggested that although the geotextile certainly has a beneficial effect on embankment over soft subsoil, due to the relative lower stiffness of geotextile, to achieve a substantial improvement on embankment behavior, the multi-layer geotextile reinforcements or high strength geogrid may be needed. This case history also demonstrated that the rate of lateral displacement and excess pore pressure development are sensitive indexes for the stability of embankment on soft subsoil.
DEVELOPMENT AND HUMAN SETTLEMENT IN SAGA AND SHIROISHI PLAINS BY RECLAMATION M. R. Madhav; N. Miura; T. Igarashi
Lowland Technology International Vol 4 No 1, June (2002)
Publisher : International Association of Lowland Technology

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The paper describes a case study of development of a very unique region in Japan, consisting of the Ariake bay and the Saga plain, which is subjected to about 6 m of tidal fluctuations and had been reclaimed from the sea over a period of centuries. The sequences of land development, reclamations, developments of water systems, dwellings, etc. are traced. The distinct characteristics of hydrology, irrigation and water management and urban drainage are described. Lastly, the serious problem of subsidence due to excessive pumping of ground water mostly for irrigation but also for industrial and domestic use is high-lighted. The human settlements in this region have evolved along unique patterns of design especially of the water systems and the houses in spite of being subjected to construction on very soft soil, being buffeted by typhoons and subsidence.
Co-Authors C. W. Yang J. C. Chai M. R. Madhav P. K. Basudhar T. Igarashi Y. S. Ye