深部围岩非规则破裂化的温度效应分析

利用FLAC3D中应变软化模型和温度模式建立数值计算模型，考虑初始地应力中温度热应力的修正并以函数的形式嵌入，讨论了非规则破裂化现象中应力及塑性区的特征。考虑地层温度和岩体热力学参数对深部围岩非规则破裂化的影响，分析围岩最大最小应力及塑性区特征。数值分析表明:FLAC3D塑性区图中呈现明显的非规则破裂化现象，而且随着地层温度升高和线膨胀系数增大，深部围岩非规则破裂化趋于严重；线膨胀系数大的围岩受温度影响较大。比热容和导热系数对深部围岩非规则破裂化影响微弱。得到了震荡的最大最小主应力曲线，最大剪应力与塑性区呈现出与最大剪应力理论相似却又不同的关系，即非规则破裂塑性区外边界和最大剪应力曲线的主峰值存在对应关系，但最大剪应力曲线主峰值相对于塑性区外边界存在滞后性。

An analysis of the temperature effect of irregular failure in deep rock mass

Numerical calculation model is set up by using the strain-softening model and the temperature pattern in FLAC3D. Considering the revision in in-situ stress related to the temperature and embedding it in the calculation model in the form of a function, we discuss the stress and the characteristics of the plastic zone of irregular failure. The influence of formation temperature and rock mass thermodynamic parameters on irregular failure in deep rock mass is considered, and the characteristics of the maximum and minimum stress and the plastic zone are analyzed. The plastic zone figure of FLAC3D presents obvious irregular failure. As formation temperature and the linear expansion coefficient increase, the irregular failure in deep rock mass tends to be more serious. The greater the coefficient of linear expansion of rock is, the more it is sensitive to temperature. The influence of specific heat and thermal conductivity on irregular failure in deep rock mass is weak. The shock of the maximum minimum principal stress curve is obtained, and the relationship between the maximum shear stress and the plastic zone is similar but different to the maximum shear stress theory. There is a corresponding relationship between the outer boundary of plastic zone and the main central peak of the maximum shear stress curve, but the main central peak of the maximum shear stress curve is lag relative to the plastic zone boundary.