三维应力作用下单一裂缝渗流规律的理论与试验研究  

THEORETIC AND EXPERIMENTAL STUDIES ON SEEPAGE LAW OF SINGLE FRACTURE UNDER 3D STRESSES

作　　者：常宗旭[1] 赵阳升[1,2] 胡耀青[1] 杨栋[1] 

机构地区：[1]太原理工大学采矿工艺研究所 [2]中国矿业大学能源科学与技术学院徐州221008

出　　处：《岩石力学与工程学报》2004年第4期620-624,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家杰出青年科学基金(59625409);国家自然科学基金重点项目(50134040);山西省基金重点项目(98075)资助课题。

摘　　要：针对目前国内外在岩石力学学科中争议较大的关于岩体裂缝的渗透系数是否受侧向应力的影响这一焦点问题进行了深入的研究。建立了单一裂缝岩体在三维应力作用下的物理模型和严密的关系方程,推导出渗透系数计算公式,并对该公式进行了大量的三轴试验数据的验证。其简化后的仅在法向应力作用下的渗透系数计算公式,与已有的计算公式一致。分析后得出结论:裂缝侧向应力引起的裂缝侧向变形对其裂缝渗流有重要的影响,其影响规律同样是负指数规律。A thorough study is carried out to answer whether the permeability coefficient of the fracture in rock is influenced by lateral stresses. The physical model and strict relative equations of rock mass with single fracture under 3D stresses are proposed by considering the tectonic characteristics of fracture in rock. In the model,it is supposed that the fracture in rock is composed of two body matrixes and the fracture is filled by soft material,whoes elastic modulus is much less than that of the body matrixes. Under 3D stresses,the coupling deformation of fillings and body matrixes makes the fillings dense and the permeability coefficient of the fracture decreased,in which the lateral deformation of the fracture plays significant role. The lateral deformation of body matrixes is equal to that of the fillings in fracture when the fracture is very narrow. Meanwhile the density of the fillings in the fracture will be changed with the lateral deformation and consequently the permeability coefficient of the fracture will be changed. The deduced calculation formula of permeability coefficient is examined by large amount of triaxial experimental data of coal and limestone. The simplified calculation formula of permeability coefficient with only normal stress is the same as traditional one. It is concluded that the lateral deformations caused by lateral stresses make important effects on the fracture seepage,whose relation is of the form of negative exponent law.

关 键 词：岩石力学 裂缝 三维应力 渗流 试验 

分 类 号：TV223.4[水利工程—水工结构工程]