Experimental research and numerical simulation of interface between ribbed geomembrane and geotextile
Received date: 2017-04-25
Online published: 2019-05-05
针对填埋场沿土工膜与土工布界面易出现滑移失稳的问题,设计了加肋土工膜衬垫系统的室内模型试验. 根据正交试验原理,考虑加肋土工膜的加肋形状、加肋高度和加肋间研究了10种试验工况下的衬垫系统沉降.在试验基础上, 采用基于离散元理论的颗粒流软件PFC$^{\rm2D}$进行数值模拟. 试验结果表明, 加肋间距为175$\sim $400mm、肋块高度为4.5$\sim $6.0 mm时存在最优值.数值模拟结果表明,PFC数值模拟能较好地拟合室内模型试验的荷载-沉降曲线,得出加肋土工膜衬垫系统附近砂土颗粒运行情况和应力变化情况,揭示模型内部颗粒的运动轨迹和加肋土工膜受力机理.
高俊丽, 李厚伟, 曹威 . 加肋土工膜与土工布界面模型试验与数值模拟[J]. 上海大学学报(自然科学版), 2019 , 25(2) : 317 -327 . DOI: 10.12066/j.issn.1007-2861.1928
To study the effect of ribbed geomembrane on stability of a landfill liner system, an indoor model test of the ribbed geomembrane liner system is designed. According to the principle of orthogonal test, considering shape, height and space of the rib, ten test cases are designed to study the settlement of the liner system. Analysis results show that optimal values exist. The optimal rib space is between 175 mm and 400 mm, and the optimal rib height is between 4.5 mm and 6.0 mm. On this basis, numerical simulation of the model test is carried out using the particle flow software PFC$^{\rm 2D}$. It has been shown that the PFC simulation can well fit the indoor load-settlement model. The sandy soil particles operation and stress change neared ribbed geomembrane can be obtained. The track and force mechanism of the internal particle in the model are revealed.
Key words： ribbed geomembrane; indoor model test; particle flow code
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