白鹤滩水电站层间错动带的剪切特性.docx

白鹤滩水电站层间错动带的剪切特性徐鼎平 1，冯夏庭 1，崔玉军 2，江权 1，江亚丽 3，黄可 3(1. 中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，湖北 武汉 430071；2. 法国国立路桥大学，法国 巴黎 77455；3. 中国水电工程顾问集团公司 华东勘测设计研究院，浙江 杭州 310014)摘要：基于白鹤滩水电站层间错动带的室内和现场剪切试验结果，对层间材料、层间材料/母岩接触面(土/岩接触面)的剪切力学特性进行研究。试验结果表明，层间材料和土/岩接触面都表现出无剪胀行为的理想弹塑性力学特 性；层间材料的蠕变特性不明显；土/岩接触面的抗剪强度与接触面形貌密切相关，接触面越粗糙，其抗剪强度就 越高。比较层间材料的室内和现场直剪试验的抗剪强度可知，试样具有强烈的不均匀性。试样扰动对其抗剪强度 的影响要比材料变异性的影响小。尺寸效应使得室内试验获得的内摩擦角要比现场试验获得的大。黏粒含量是影 响层间材料抗剪强度的重要因素：随着黏粒含量的增加，内摩擦角减少，黏聚力增大。层间材料的抗剪强度对初 始饱和度的变化不敏感。室内试验和现场试验结果在黏粒含量和初始饱和度影响上表现出良好的一致性，说明试 样的尺寸效应和变异性只是影响其抗剪强度的次要因素。 关键词：水利工程；白鹤滩水电站；层间错动带；剪切特性；不均匀性；饱和度；黏粒含量中图分类号：TV 62文献标识码：A文章编号：1000–6915(2012)增 1–2692–12SHEAR BEHAVIORS OF INTERLAYER STAGGERED ZONE ATBAIHETAN HYDROPOWER STATIONXU Dingping1，FENG Xiating1，CUI Yujun2，JIANG Quan1，JIANG Yali3，HUANG Ke3(1. State Key Laboratory of Geomechanics and Geotechnical Engineering，Institute of Rock and Soil Mechanics，Chinese Academy ofSciences，Wuhan，Hubei 430071，China；2. Navier/CERMES，Ecole des Ponts ParisTech，Paris 77455，France；3. HydroChina Huadong Engineering Corporation，Hangzhou，Zhejiang 310014，China)Abstract：Based on the results of in-situ direct shear tests and laboratory shear tests on interlayer staggered zonesat Baihetan hydropower station，the shear behaviors of interlayer material and interlayer material/host rock interface(soil/rock interface) were investigated. It is observed that both of interlayer material and soil/rock interface show an elastic perfect-plastic behavior without dilatancy. Creep of interlayer material is found to be insignificant.The interface roughness dependent of shear strength of soil/rock is identified，namely，the rougher the interface is，the higher the shear strength is. A comparative analysis was performed based on the shear strength parameters from in-situ and laboratory direct shear tests on the interlayer material. It is evidenced that the heterogeneity of samples is significant under both laboratory and field conditions. The sampling disturbance seems to be a factor less import