岩石流变扰动效应试验及其本构关系研究  

A RHEOLOGICAL TEST OF SANDSTONE WITH PERTURBATION EFFECT AND ITS CONSTITUTIVE RELATIONSHIP STUDY

作　　者：高延法[1] 肖华强[1] 王波[1] 章延平[1] 

机构地区：[1]中国矿业大学,北京100083

出　　处：《岩石力学与工程学报》2008年第S1期3180-3185,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家重点基础研究发展规划(973)项目(2006CB202200);国家重点基础研究发展计划(973)项目(2007CB209400);国家自然科学基金资助项目(50474029);国家科技支撑计划项目(2006BAB16B04)

摘　　要：深井软岩条件下的巷道围岩流变变形较大,且对扰动作用十分敏感,由扰动作用引起的变形不可忽略。提出岩石强度极限邻域、岩石流变扰动效应等岩石力学新概念,得出岩石处于强度极限邻域范围内时,扰动效应具有显著作用。研制岩石流变扰动效应试验仪,进行岩石流变及其扰动效应试验。试验测试岩石在其强度极限邻域内的恒定轴向荷载作用下,对岩石试件进行扰动荷载冲击扰动,得出不同蠕变阶段具有的扰动效应,绘制不同蠕变阶段的扰动次数–累积变形曲线。根据试验成果,分析岩石蠕变扰动效应的影响因素,建立蠕变不同阶段扰动作用条件下在的岩石本构方程。Large rheological deformation of softening sandstone at great depth is exclusively associated with perturbation. And the study of rock rheology and its perturbation effect becomes especially important. Two new concepts,limit neighbor of rock strength and perturbation effect of rock rheology,are proposed. An experimental result is obtained that the perturbation effect is obvious when the rock sample is in the scope of limit neighbor of rock strength,which indicates that the rock rheology and its perturbation osculate with the rock′s strain condition; and the perturbation effect is sensitive to the limit deformation. With the concept of limit neighbor of rock strength and perturbation effect of rock rheology,an alternative experimental instrument is developed for studying such a perturbation effect,and it is also used to test some sandstone samples under the conditions of constant axis-loads at different rheological phases. Some perturbation time and cumulative deformation curve of sandstone rheology at different phases are achieved for studying the rule of rock rheology and its perturbation effect. Finally,the factors of perturbation effect and a rheological constitutive equation for sandstone at different rheological phases are presented to simulate the perturbation effect. The constitutive equation can be used to calculate the rheology and its perturbation increment of the same rock;and the stability of surrounding rock can be analyzed.

关 键 词：采矿工程 深井地压 岩石流变 扰动效应 

分 类 号：TU458[建筑科学—岩土工程]