高渗压条件下岩体变形特征试验研究

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。

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

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 hydro-mechanical 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.