A RHEOLOGICAL TEST OF SANDSTONE WITH PERTURBATION EFFECT AND ITS CONSTITUTIVE RELATIONSHIP STUDY
A RHEOLOGICAL TEST OF SANDSTONE WITH PERTURBATION EFFECT AND ITS CONSTITUTIVE RELATIONSHIP STUDY
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发表时间：
2008
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通讯作者：
Zhang Yan-ping
中科院分区：
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作者：
Zhang Yan-ping
大深度软化砂岩的大流变变形只与扰动有关。而岩石流变学及其扰动效应的研究就显得尤为重要。提出了岩石强度极限邻域和岩石流变扰动效应两个新概念。实验结果表明，当岩样处于岩石强度极限邻域范围内时，扰动效应明显，表明岩石流变及其扰动与岩石应变状态密切相关，且扰动效应对极限变形敏感。根据岩石强度极限邻域和岩石流变学扰动效应的概念，研制了一种研究岩石流变学扰动效应的替代实验装置，并利用该装置对不同流变阶段的砂岩试样进行了恒轴向载荷试验。为研究岩石流变规律及其扰动效应，获得了砂岩流变各阶段的扰动时间和累积变形曲线。最后，提出了扰动效应的影响因素，并建立了砂岩在不同流变阶段的流变本构方程，以模拟扰动效应。该本构方程可用于计算同一岩石的流变及其扰动增量，并可用于围岩稳定性分析。
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.