高孔低渗泥岩渗流-损伤耦合模型与数值模拟

发布时间：2018-03-03 18:44

本文选题：泥岩　切入点：开挖扰动区　出处：《中南大学学报(自然科学版)》2016年02期 　论文类型：期刊论文

【摘要】：以泥岩高放废物处置库为研究背景,在室内试验和现场试验研究的基础上,以泥岩损伤为主线,研究开挖扰动对泥岩渗透性的影响规律,通过在渗流-应力耦合控制方程中引入损伤变量,建立泥岩的渗流-损伤耦合模型,完成了有限元程序的二次开发。对泥岩巷道由于开挖施工引起的围岩卸载以及支护过程进行数值模拟,探讨开挖扰动影响下围岩的损伤分布形态以及渗透性质的演化规律。研究结果表明:计算所得的渗透率分布规律与实测结果一致,渗透性扰动区近似为椭圆形,扰动区最大渗透率约为原岩的397倍,与工程实际相吻合。
[Abstract]:On the basis of laboratory test and field test, the influence of excavation disturbance on permeability of mudstone is studied on the basis of laboratory test and field test, taking mud rock damage as the main line. By introducing the damage variable into the seepage stress coupling control equation, the seepage damage coupling model of mudstone is established. The secondary development of finite element program is completed. The unloading and supporting process of surrounding rock caused by excavation of mudstone roadway is simulated numerically. The damage distribution pattern and the evolution law of permeability properties of surrounding rock affected by excavation disturbance are discussed. The results show that the calculated permeability distribution law is consistent with the measured results, and the permeability disturbance zone is approximately elliptical. The maximum permeability of the disturbed area is about 397 times that of the original rock, which is consistent with the engineering practice.
【作者单位】：长江大学岩土力学与工程研究中心;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家自然科学基金资助项目(41102182,51174036) 湖北省自然科学基金资助项目(2015CFB194) 中国博士后科学基金资助项目(2014M551055) 岩土力学与工程国家重点实验室开放基金资助项目(Z013007)~~
【分类号】：TU45

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