鸡尾山特大型岩质滑坡的物理模型试验  

Physical modeling of Jiweishan Landslide from massive rock slope failure

作　　者：冯振[1] 殷跃平[2] 李滨[1] 闫金凯[1] 蔡奇鹏[3] 

机构地区：[1]中国地质科学院地质力学研究所国土资源部新构造与地质灾害实验室,北京100081 [2]中国地质环境监测院,北京100081 [3]华侨大学土木工程学院,福建泉州361021

出　　处：《中南大学学报（自然科学版）》2013年第7期2827-2835,共9页Journal of Central South University:Science and Technology

基　　金："十二五"国家科技支撑项目(2012BAK10B01);中国地质调查局地质调查工作项目(12000200610068);中国地质科学院地质力学研究所基本科研业务费项目(DZLXJK201307)

摘　　要：鸡尾山滑坡的失稳模式为斜倾厚层岩质滑坡视向滑动。为了研究这种独特的特大型岩质斜坡失稳模式,利用土工离心机,对1个包含4组结构面的地质力学模型进行物理模型试验。研究结果表明:随着离心机加速度的不断增大,后部块体首先失稳并推挤前缘关键块体,粘贴在滑块与基座之间的裂缝监测应变片从斜坡后缘到前缘相继发生破坏;当离心加速度达到80g(1g=9.8 m/s2)时,斜坡前缘关键块体发生位移突变,产生瞬时视向滑动破坏,引起整体滑坡;软弱夹层抗剪强度的降低和关键块体瞬时失稳是鸡尾山滑坡发生的主要原因,斜倾厚层岩质滑坡视向滑动具有"后部块体驱动前缘关键块体失稳"的特征,斜坡的初始变形破坏是一个从稳定到失稳渐进发展的过程。Jiweishan landslide illustrates a failure pattern of apparent dip slide from oblique inclined layered rock slope failure.Physical modeling test through geotechnical centrifuge was conducted on model consisting of four sets of joints to investigate this remarkable mechanism for landslide initiation from massive rock slope failure.Centrifuge modeling tests shows that the crack strain gauges are damaged successively from back to front as centrifuge acceleration ascends.During the process,the driving blocks in the rear lose stability and crush on the key block in the front.When acceleration reached 80g,instantaneous apparent slip failure happened to key block in the front,which led to sudden displacement rise and triggered the entire landslide.The initial failure is a progressive failure process from being the rear to the front of the slope and from stable to instable.Apparent dip slide from oblique inclined thick layered rock slope failure has a characteristic that the key block destabilized instantaneously with blocks in the rear driving and the initiation is a progressive failure process from stable to unstable.

关 键 词：离心机 物理模拟 滑坡 斜倾厚层岩质斜坡 

分 类 号：P642[天文地球—工程地质学]