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黏土-结构接触面易产生大的剪切变形,且由于场地、施工等原因,接触面部位可能存在填筑缺陷、杂质等情况,这些因素均可能对其渗流安全产生不利影响。本文采用一种接触面剪切渗流试验装置,对黏土-结构接触面大剪切变形后的渗流特性进行了试验研究,重点模拟了接触面存在填筑缺陷及含有杂质两种工况下的渗流特性,并与均质黏土接触面渗流特性进行了对比,同时对接触面正应力、剪切变形、水力坡降的影响进行了分析。结果表明:含有填筑缺陷的接触面在大剪切变形过程中渗透性降低;而含有粉土杂质的混合黏土接触面,其渗透性起初随剪切变形的增加而减小,剪切至某一程度后反向增加;存在填筑缺陷和杂质的接触面渗透性强于均质黏土接触面。
Clay-structure contact surface is easy to produce large shear deformation, and due to site, construction and other reasons, there may be filling defects, contact surfaces and other factors, which may adversely affect the seepage safety. In this paper, a contact shear shear seepage test device was used to study the seepage characteristics of clay-structure contact surface after large shear deformation. The seepage characteristics of the contact surface with filling defects and impurities were emphatically simulated And compared with the seepage characteristics of the homogeneous clay contact surface, the influences of the normal stress, shear deformation and hydraulic gradient of the contact surface were analyzed. The results show that the permeability of the contact surface containing the filling defects decreases during the large shear deformation; while the contact surface of the mixed clay containing silt impurities decreases initially with the increase of shear deformation, After a degree of reverse increase; the presence of defects and impurities fill the contact surface permeability is stronger than the homogeneous clay contact surface.