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基础局部沉降会引起衬垫系统中的土工膜和无纺布产生较大的拉应变,有可能导致衬垫系统受拉破坏或性能下降。通过模拟试验,采用应变片、土压力盒和位移计,对基础发生局部沉降后土工膜和无纺布组成的衬垫系统的变形进行了研究。试验结果表明:基础发生局部沉降后,沉陷区中心处应变最大,从中心点往两侧应变逐步减小;沉陷区上覆荷载发生了变化;衬垫系统的刚度对变形影响较大。最后,对试验结果进行了讨论,得到了一些有益的结果,基础局部沉降发生后衬垫系统各点应变不同,沉陷区外衬垫系统发生了滑移以及沉陷区内上覆荷载发生了重分布。
Local subsidence will cause the geotextiles and nonwovens in the liner system to have a large tensile strain, which may cause the liner system to collapse or deteriorate in performance. The deformation of the liner system composed of geomembrane and non-woven fabric after partial subsidence was studied by means of simulation test, strain gauge, earth pressure box and displacement meter. The experimental results show that the strain at the center of the subsidence area is the largest, and the strain decreases gradually from the center point to the two sides; the overburden load in the subsidence area changes; and the stiffness of the liner system has a great influence on the deformation. Finally, the experimental results are discussed, and some beneficial results are obtained. After the local subsidence, the strain at different points of the liner system is different, the slippage occurs in the outer liner system in the subsidence area, and the overburden load in the subsidence area is redistributed .