含弱透水夹层饱和砂土坡体滑坡的实验研究.pdfVIP

第 22 卷 第 12 期 岩石力学与工程学报 22(12) ：2001～2005 2003 年12 月 Chinese Journal of Rock Mechanics and Engineering Dec ，2003 * 含弱透水夹层饱和砂土坡体滑坡的实验研究 张均锋 孟祥跃 俞善炳 谈庆明 ( 中国科学院力学研究所 北京 100080) 摘要 通过含有细砂夹层的饱和砂土在冲击载荷下的滑坡模拟实验，考察了土层参数不均匀的坡面的滑坡模式， 坡体变形，破坏和不均匀渗流引起的滑坡，特别是散体粒径不均匀时出现的含水层和通道与滑坡的关系，各控制 参数(载荷的和土体的)对滑坡的影响，并对这类滑坡中的现象给出了定性解释。 关键词 滑坡，饱和砂土，低渗透层 分类号 TU 475 文献标识码 A 文章编号 1000-6915(2003)12-2001-05 TESTING STUDY ON LANDSLIDE OF SATURATED SAND SLOPE SANDWICHED WITH LOW-PERMEABILITY LAYER Zhang Junfeng ，Meng Xiangyue ，Yu Shanbing ，Tan Qingming (Institute of Mechanics ，The Chinese Academy of Sciences， Beijing 100080 China) Abstract The pattern of uneven seeinduced landslide in the saturated sand slope sandwiched with a low-permeability layer under impact loading is explored by means of simulation tests. Especially，the relations between the development of landslide and the emergence of water layer and drainage pathway are described. Some major influencing factors ，such as intensity of loading，thickness of fine sand layer ，angle of slope，and densification degree of sand，are also examined. The testing results show that，under a certain impact loading ，the structure of the sand sample undergoes irrecoverable deformation，the pore water pressure is built up immediately ， and the sand sample is liquefied. The pore water is driven quickly because the permeability of the initial liquefied sand is larger than that of the origin sand，and that caused simultaneously settlement of the sand. Given that the drainage in