条带式加筋土挡墙力学性能模型试验及数值模拟
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摘要
通过室内模型试验对条带式加筋土挡墙的作用机理进行探讨.测试挡墙面板的水平位移、侧向土压力以及筋带轴向应变在填土表面局部逐级加载情况下的变化情况,并利用有限元软件进行数值模拟.数值模拟与模型试验结果一致表明,土体中加入筋体材料能明显提高其稳定性;在各级荷载作用下挡墙面板的侧向土压力沿墙高向下逐渐增大,而侧向位移沿墙高向下则逐渐减小;筋带的轴向应变呈单峰状分布.模型试验中,局部逐级荷载作用下,挡墙面板的侧向土压力增量沿墙高向下逐渐增大;侧向位移增量明显上部大于下部;筋带沿其轴向应变的增量先增大后减小.
The functional mechanism of striped bar-reinforced earth retaining wall was explored by means of indoor model test. On the basis of it, the variation of horizontal displacement of the wall-panel, lateral earth pressure, and axial strain of reinforcing stripe was tested under condition of partial stepwise loading onto fill surface. And then its numerical simulation was conducted with finite element software. The results of numerical simulation and model test were consistent with each other and it was shown that adding reinforcement material to soil could obviously improve its stability. Under the action of the load at all levels, the vertical lateral earth pressure on the wall panel would increase gradually downward, the vertical lateral displacement of the wall panel would decrease downward, but the axial strain of the reinforcing stripe would exhibit a single peak distribution. In the model test under action of partial stepwise loading, the increment of vertical lateral earth pressure on wall panel would gradually increase from top to bottom, the increment of lateral displacement would be greater at upper part than that at lower part, and, however, the increment of axial strain of the reinforcing stripe would increase first and then decrease.
The functional mechanism of striped bar-reinforced earth retaining wall was explored by means of indoor model test. On the basis of it, the variation of horizontal displacement of the wall-panel, lateral earth pressure, and axial strain of reinforcing stripe was tested under condition of partial stepwise loading onto fill surface. And then its numerical simulation was conducted with finite element software. The results of numerical simulation and model test were consistent with each other and it was shown that adding reinforcement material to soil could obviously improve its stability. Under the action of the load at all levels, the vertical lateral earth pressure on the wall panel would increase gradually downward, the vertical lateral displacement of the wall panel would decrease downward, but the axial strain of the reinforcing stripe would exhibit a single peak distribution. In the model test under action of partial stepwise loading, the increment of vertical lateral earth pressure on wall panel would gradually increase from top to bottom, the increment of lateral displacement would be greater at upper part than that at lower part, and, however, the increment of axial strain of the reinforcing stripe would increase first and then decrease.
引文
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[3] ENSAN M N,SHAHROUR I.A simplified elastoplastic macroscopic model for the reinforced earth material [J].Mechanics Research Communications,2000,27(1):79-86.
[4] BENNIS M,DE BUHAN P.A multiphase constitutive model of reinforced soils accounting for soil-inclusion interaction behavior [J].Mathematical and Computer Modeling,2003,37:469-475.
[5] 刘华北,LING H I.土工格栅加筋土挡土墙设计参数的弹塑性有限元研究 [J].岩土工程学报,2004,26(5):668-673.
[6] 王淑红.基于三剪统一强度理论的挡土墙土压力计算的水平层分析法及加筋挡土墙计算理论研究 [D].西安:长安大学,2013.
[7] 朱彦鹏,毕东涛,周勇.直立式加筋挡土墙稳定性数值模拟分析 [J].兰州理工大学学报,2011,37(2):106-110.
[8] 杨长卫,张建经,陈强,等.加筋重力式挡土墙抗震设计方法研究 [J].土木工程学报,2015,48(8):77-85.
[9] 贾亮,朱彦鹏,来春景.地震作用下加筋挡土墙筋带拉力计算研究 [J].岩土工程学报,2013,35(增刊1):412-417.
[10] 贾亮,朱彦鹏,来春景.地震作用下加筋挡土墙稳定性分析 [J].西南交通大学学报,2016,51(4):697-703.
[11] 陈祖煜,章吟秋,宗露丹,等.加筋土边坡稳定分析安全判据和标准研究 [J].中国公路学报,2016,29(9):1-12.
[12] 王成皿,王中文.基于规范法的加筋土挡土墙边坡加固稳定性计算研究 [J].中外公路,2017(2):24-26.
[13] 张智超,陈育民,刘汉龙,等.微型桩-加筋土挡墙应力变形特性的多因素分析 [J].岩土力学,2017,38(7):1911-1918.
[14] 黄向京,许桂林,杨果林,等.加筋格宾新型组合支挡结构试验研究 [J].公路交通科技,2011,28(2):7-13.
[15] 王万平,翁光远.条带式加筋土挡墙的拉筋原型观测试验研究 [J].水利与建筑工程学报,2011,9(6):68-72.
[16] 曹礼聪,张建经,付晓,等.条带式刚性面板加筋土挡墙筋带应变响应特性研究 [J].岩石力学与工程学报,2017,36(7):1768-1779.