高湿度环境下围岩松动圈形成机理探讨

Study of mechanism of EDZ in high humidity environment

为研究围岩松动圈形成和扩展机理,从环境因素入手,通过引入湿度扩散方程,以及湿度与围岩力学性质的弱化关系,建立了湿度-应力-损伤理论模型,采用数值模拟的方法再现了围岩松动圈的形成扩展过程,得到了围岩时效性变形和破坏规律及其相应的应力演化结果。结果表明:数值模拟结果与现场试验结果具有很好的一致性;湿度是影响松动圈形成的一个重要因素,这一观点不仅可以有效解释目前松动圈理论存在的问题,而且可以为完善松动圈理论提供新思路。

To identify the EZD formation and propagation mechanism,the humidity-stress-damage coupling model based on the environmental factor was established by introducing the humidity diffusion equation and the humidity weakening effect on rock characteristics.The EZD formation and propagation process was reproduced in numerical simulation,and the time-dependent de-formation and failure characteristics of surrounding rocks and their stress evolution process were analyzed.The results show that numerical result is in good agreement with that from field test.Humidity is an important factor that affects the EDZ formation, and this conclusion can not only explain the current doubts about EDZ but also provide some new ideas for the development of EDZ theory.