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|Keywords: ||液化防制;地中壁;土壤液化;地工離心機;加速度放大效應;沉陷量;超額孔隙水壓;殘餘應力;centrifuge shaking table test;underground wall;soil liquefaction|
|Issue Date: ||2014-08-11 18:11:18 (UTC+8)|
;A series of centrifuge shaking table tests was conducted to investigate the mitigating effect on soil liquefaction by the lattice-shaped underground wall. During the test, accelerometers, pore pressure transducers, linear variable differential transformers and micro earth pressure transducers were embedded in the soil layer to monitor the seismic response of soil deposit. The mitigating effect was evaluated by the measurements, including (1) maximum peak ground acceleration along the depth; (2) excess pore pressure histories at different depths; (3) ground settlement and (4) lateral total pressure applied on the underground wall.
From the test result, it can be conclude that (1) the acceleration amplitude was amplified from the base to the surface ground before soil liquefaction. The shear wave can not propagate through the liquefied soil layer to the ground surface and leading to that the acceleration amplification was smaller than 1. (2) The lattice-shaped underground wall with 5 m-width spacing was effective to mitigate the generation of pore water pressure and to decrease the settlement of surface ground. (3)The total lateral pressure acted cyclically on the underground wall and increased with increasing depth during shaking. (4) The ground settled and the lateral earth pressure acting on the underground wall increased during the pore water pressure dissipation. Therefore, there was an additional force acted on the underground wall as compared to the initial condition.
|Appears in Collections:||[土木工程研究所] 博碩士論文|
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