软硬互层试样卸荷蠕变变形及强度特征研究  

Deformation Characteristics and Strength Characteristics of Soft and Hard Interlayer Under Unloading Creep Deformation

作　　者：闫兴田 周会信 石豫川[2] 张波 YAN Xingtian;ZHOU Huixin;SHI Yuchuan;ZHANG Bo(East China Investigation and Design Institute Co.,Ltd.(Fuzhou),Fuzhou,Fujian 350003,China;State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]华东勘测设计院(福建)有限公司,福建福州350003 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059

出　　处：《水利与建筑工程学报》2020年第6期202-207,234,共7页Journal of Water Resources and Architectural Engineering

摘　　要：以卡拉水电站为背景,人工浇筑软硬互层试样,通过卸荷蠕变试验研究卡拉水电站坝址卸荷岩体长期变形及强度特征。研究表明:软硬互层状试样在卸荷蠕变条件下,主要产生沿层面方向及垂直于层面方向的裂纹,以拉张破坏为主,局部发生剪切破坏;当初始围压相同时,卸荷蠕变条件下的内聚力和内摩擦角约为常规三轴条件下的60.9%和56.4%。考虑卸荷蠕变条件下的强度参数折减,选取卡拉水电站典型剖面进行稳定性分析,计算结果表明边坡稳定性较好,但由于水电站运行时间较长,建议对潜在不稳定块体开展监测工作。In this paper Kala hydropower station was taken as an example,manual casting of hard and soft interbedded samples,the long-term deformation and strength characteristics of the unloading rock mass at the dam site of Kara hydropower station are analyzed by unloading creep test.The results show that under the condition of unloading creep,the soft and hard interlayer specimens mainly generate cracks along the plane direction and perpendicular to the plane direction,and are mainly tensile failures,and local shear failures occur.When the initial confining pressure is the same,the cohesion and internal friction angle of the specimen under unloading creep conditions are approximately 60.9%and 56.4%under the conventional triaxial conditions.Considering the reduction of strength parameters under the condition of unloading creep,the typical profile of Kara hydropower station is selected for stability analysis.The calculation results show that the slope stability is good,but since the hydropower station has long operating time,it is recommended to monitor the potentially unstable blocks.

关 键 词：卸荷岩体 卸荷蠕变 软硬互层 变形特征 

分 类 号：TV223.21[水利工程—水工结构工程]