高孔低渗泥岩渗流-损伤耦合模型与数值模拟

来源期刊:中南大学学报(自然科学版)2016年第2期

论文作者:贾善坡 高敏 于洪丹 龚俊

文章页码:558 - 569

关键词:泥岩;开挖扰动区;渗透性演化;损伤;耦合

Key words:clay stone; excavation disturbed zone; permeability evolution; damage; coupling

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: Taking a high-level radioactive waste repository of clay stone as background, the evolution mechanism of permeability was investigated based on the permeability experiments in lab and site of excavation-disturbed zone. A coupled damage-permeability model was proposed when the damage and permeability evolution were considered as the key coupled factors that control the hydro-mechanical equations, and the secondary development of the finite element program was completed. For the process of the unloading and supporting of surrounding rock by excavation and construction, the evolution and distribution of damage, pore pressure and permeability of clay stone were simulated by the finite element method. The results show that the permeability of excavation damaged zone is 397 times than that of the original clay after excavation. The disturbed zone of permeability is elliptical shape, and the calculated values are close to the measured ones around gallery.

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