软土地基加筋石灰土路堤离心模型试验数值模拟  

NUMERICAL SIMULATION OF CENTRIFUGAL MODEL TEST ON REINFORCED EMBANKMENT WITH LIME-STABILIZED SOIL AS BACKFILL ON SOFT CLAY FOUNDATION

作　　者：陈建峰[1] 叶铁锋[1] 俞松波[1] 石振明[1] 

机构地区：[1]同济大学地下建筑与工程系

出　　处：《岩石力学与工程学报》2008年第9期1939-1944,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50508030);上海市重点学科建设项目(B308)

摘　　要：建立以离心试验几何尺寸的有限元数值模型,模拟变加速度加载下软土地基加筋石灰土路堤中的位移、土压力、孔隙水压力和加筋拉力随时间的变化规律,并与离心模型试验结果进行比较;同时,采用该数值模型计算了不加筋、加1,2层筋时路堤和地基位移情况。计算结果表明,加筋路堤沉降量、土压力、孔隙水压力和加筋拉力的计算值与离心试验实测值吻合很好或基本一致,表明该数值模型是合理的;不加筋路堤的中心沉降量和坡脚下地基水平位移比加1层筋时明显大一些,两者在加速度为100.0 g时地面坡脚处的水平位移差值达近2 mm,而加2层筋时位移与加1层筋接近。A finite element numerical model is established based on the dimensions of a centrifugal test model to simulate the changes of displacements, earth pressures, pore water pressures and tensile forces of reinforcements with time in the soft clay foundation on the reinforced embankment with lime-stabilized soil as backfill under the variable acceleration loadings. The computed results then are compared with those obtained from the centrifugal test. Three cases of unreinforced, one-layer reinforced and two-layer reinforced embankments are also simulated based on the calibrated numerical model. The results show that the computed displacements, earth pressures, pore water pressures and tensile forces of the reinforcements are in good agreement with the measured ones, indicating the appropriate numerical model. The vertical and lateral displacements, respectively at the center and the slope toe of the unreinforced embankment, are greater than those of one-layer reinforced embankment. The difference of the ground surface horizontal displacements at the slope toe between unreinforced and one-layer reinforced embankments reaches nearly 2 mm when the acceleration is 100.0 g; however, the displacements of the two-layer reinforced embankment are very close to those of one-layer reinforced embankment.

关 键 词：土力学 路堤 软土地基 石灰土 土工格栅 数值模拟 离心试验 

分 类 号：TU44[建筑科学—岩土工程]