高渗压条件下岩体变形特征试验研究  

Study on deformation characteristic of rock mass due to seepage under high water pressure

作　　者：冯树荣[1] 蒋中明[2] 钟辉亚[1] 陈胜宏[3] 

机构地区：[1]中国水电顾问集团中南勘测设计研究院,长沙410014 [2]长沙理工大学水利工程学院,长沙410004 [3]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《水力发电学报》2012年第4期189-193,共5页Journal of Hydroelectric Engineering

基　　金：中国水电顾问集团科技计划项目(CHC-KJ-2009-08)

摘　　要：裂隙岩体在高水头作用下的变形特性关系到岩体工程安全评价结果。结合某工程高压压水试验,设计了考察岩体高压渗流引起岩体位移的原位试验方案,并进行了相应的岩体流固耦合试验。通过对试验过程中岩体孔隙压力和位移监测值的分析,揭示了高压渗流区将引起岩体产生较大的位移变形。应用流固耦合模型从理论角度解释了高压渗流引起岩体位移和孔隙压力非恒定变化过程的原因。研究表明:采用流固耦合分析模型对高水压作用下岩体变形进行分析是科学合理的,它可以正确地反映裂隙岩体渗流引起的岩体变形特性。Deformation of rock mass under high water pressure is a crucial condition to safety evaluation of rock engineering project. In this paper, an in-situ test scheme for high-pressure permeability test （HPPT） is proposed for observation of rock displacement under high-pressure seepage flow, and the results of hydromechanical coupling test using this scheme are presented. An analysis of the measured pore pressure and rock displacement shows that the test high-pressure seepage leads to great displacement deformation of rock mass. A hydro-mechanical coupling model and numerical simulations were used to explain these phenomena and the time variations of pore pressure and displacement deformation. Results show that this model well describes the deformation mechanism and coupling effect, and thus it provides better understanding of rock＂ mass deformation under high-pressure seepage.

关 键 词：岩土力学 岩体变形 原位试验 流固耦合效应 孔隙压力 

分 类 号：TV223.6[水利工程—水工结构工程]