砂岩蠕变过程中的渗流特性试验研究

Seepage experiment of sandstone during creep processes

岩体是由岩块,结构面和结构面内充填物构成的结构体,在岩体结构的控制下,岩体的变形破坏是复杂的。通过采用RLW-2000型微机控制煤岩三轴流变试验机对水压-应力耦合作用下的脆性砂岩试件蠕变特性研究,认为在实际渗流岩体中,岩体渗透系数与岩体周围应力状态关系密切相关,渗透系数伴随围压增加呈现减小趋势,孔隙水压的上升,在一定范围内使得渗透系数发生变化。且最终孔隙水存在的力学以及侵蚀作用,在试件蠕变变形的过程中加快了试件的破坏速度。

Rock body is made of rock,structural surface and fillings in the structural surface.Under the control of rock mass structure,the deformation of rock mass is complicated.By using trixial microcomputer control of coal rock rheological testing machine,the creep character of Brittle sandstone under the influence of water pressure and stress coupling was studied.It is belived the seepage parameter of rock body is related to stress condition around rock body in actual seepage rock body.It is studied that seepage parameter gets smaller with the increase of confining pressure;the seepage parameter will change with the increase of pore water pressure.At last,the effect of mechanic and erosion of pore water increased the damage speed of sample in the process of creep.