基于蠕变损伤的深部泥质软岩巷道断面变化规律研究  

Variation law of roadway section in deep argillaceous soft rock based on creep damage

作　　者：王大顺 WANG Dashun(Zhongyun International Engineering Co.,Ltd.,Zhengzhou 450007,China)

机构地区：[1]中赟国际工程有限公司,河南郑州450007

出　　处：《煤炭工程》2023年第9期96-102,共7页Coal Engineering

基　　金：中国博士后科学基金委员会面上项目(2020M672224)。

摘　　要：针对深埋巷道高温、高压、高湿度环境下巷道围岩变形大、损伤提前等问题,以经典Cvisc本构模型为基础,理论推导了考虑蠕变损伤、围岩材料弱化系数的围岩本构模型,运用数值模拟、现场监测等综合方法验证了泥质软岩损伤本构模型的合理性,在此基础上对比分析了干燥状态、潮湿软化状态下的深部巷道围岩的蠕变范围及巷道断面变形。研究结果表明:考虑损伤、围岩材料弱化系数的Cvisc本构模型可以较好地描述深部环境下巷道围岩变形与时间的关系,巷道围岩在蠕变阶段中主要表现为黏弹性变形;软化状态对围岩的损伤具有明显的时间效应,使得18 d后潮湿软化状态下的蠕变范围较干燥状态下扩大;干燥、潮湿软化状态下巷道断面变化均具有非对称性,其中干燥状态下变化形状为近似的偏转菱形,潮湿软化状态下变化形状为近似的偏转梯形,且潮湿软化状态下巷道断面变化大于干燥状态下。Aiming at the problems of large deformation and early damage of surrounding rock in deep roadway under high temperature,high pressure and high humidity environment,based on the classical Cvisc constitutive model,the constitutive model of surrounding rock considering creep damage and weakening coefficient of surrounding rock material is deduced theoretically.The rationality of the constitutive model is verified by comprehensive methods such as numerical simulation and field monitoring.On this basis,the creep range and section deformation of deep tunnel surrounding rock under dry and damp softening states are compared and analyzed.The results show that,the Cvisc constitutive model considering damage and weakening coefficient of surrounding rock material can better describe the relationship between surrounding rock deformation and time in deep environment.The surrounding rock of tunnel is mainly viscoelastic deformation in creep stage.The softening state has obvious time effect on the damage of surrounding rock,which makes the creep range of damp softening state expand after 18 days compared with dry state.The change of tunnel section under dry and damp softening states is asymmetric.The change shape under dry condition is approximate deflection diamond,and the change shape under damp softening state is approximate deflection trapezoid,and the change of tunnel section under damp softening state is greater than that under dry condition.

关 键 词：泥质围岩 围岩变形 蠕变特性 时间效应 

分 类 号：TD79[矿业工程—矿井通风与安全]