多场耦合作用下砂岩渗透率演化规律

发布时间：2018-01-05 00:04

本文关键词：多场耦合作用下砂岩渗透率演化规律　出处：《中南大学学报(自然科学版)》2017年09期 　论文类型：期刊论文

【摘要】：在不同温度和孔隙水压条件下,研究砂岩三轴压缩过程中渗透特性的演化规律,研究多场耦合作用下岩石渗透率与力学性质的演化规律,结合CT技术从细观角度进行验证温度和水对裂隙损伤演化的影响。研究结果表明:渗透率随着岩样的变形而变化,其变化趋势与岩样受载变形破坏的发展阶段相对应。三轴压缩状态下,渗透率对轴向力和径向变形密切相关。温度的作用降低了峰值强度、残余强度和切线模量,增大了泊松比。孔隙水压和温度的作用增大了岩体塑性,损伤减小。由于孔隙水压的增大使得有效应力减小,水楔作用、润滑作用和软化作用的存在,相同温度条件下,峰值强度、残余强度和切线模量随之减小,泊松比增大。孔隙水压的提高造成了更大的渗透率。温度的升高导致渗透率降低。
[Abstract]:Under different temperature and pore water pressure, the evolution law of permeability and mechanical properties of sandstone during triaxial compression and the evolution of rock permeability and mechanical properties under multi-field coupling are studied. The effects of temperature and water on fracture damage evolution are verified from the viewpoint of CT. The results show that the permeability varies with the deformation of rock samples. Under triaxial compression, permeability is closely related to axial force and radial deformation, and the effect of temperature reduces the peak strength. The residual strength and tangent modulus increase Poisson's ratio. The effect of pore water pressure and temperature increases the plasticity of rock mass and reduces the damage. Due to the increase of pore water pressure the effective stress decreases and the water wedge effect. With the existence of lubrication and softening, the peak strength, residual strength and tangent modulus decrease at the same temperature. The increase of Poisson's ratio and the increase of pore water pressure lead to greater permeability, and the increase of temperature leads to the decrease of permeability.
【作者单位】：东京大学土木工程系;
【基金】：国家自然科学基金资助项目(10772205)~~
【分类号】：TU45
【正文快照】： 岩土体温度场、地下水渗流场和岩土体变形场之间存在着相互作用和相互制约的复杂关系。在温度场和长期荷载共同作用下,岩体的力学特性会产生显著变化[1-4],也严重影响了岩体的渗透特性[5]。岩体的渗透性能是岩体稳定性和坝体安全的一项重要指标,这对工程建设及运行期安全起控

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