深部围岩非规则破裂化的温度效应分析
发布时间:2018-01-25 01:25
本文关键词: 深部巷道 非规则破裂 温度 热力学参数 FLACD 出处:《水文地质工程地质》2017年01期 论文类型:期刊论文
【摘要】: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。
[Abstract]:Using the strain softening model and the temperature model in FLAC3D, the numerical model is established, and the correction of the thermal stress in the initial ground stress is considered and embedded in the form of function. The characteristics of stress and plastic zone in irregular fracture are discussed. The influence of formation temperature and thermodynamic parameters of rock mass on irregular fracture of deep surrounding rock is considered. The maximum and minimum stresses of surrounding rock and the characteristics of plastic zone are analyzed. The numerical analysis shows that there is obvious irregular rupture in the plastic zone diagram of W1 FLAC3D, and it increases with the increase of formation temperature and the coefficient of linear expansion. The irregular fracture of deep surrounding rock tends to be serious; The wall rock with large linear expansion coefficient is greatly affected by temperature, and the specific heat capacity and thermal conductivity have a weak effect on the irregular fracture of deep surrounding rock. The maximum and minimum principal stress curves of the oscillation are obtained. The relationship between the maximum shear stress and the plastic zone is similar to and different from that of the maximum shear stress theory, that is, there exists a corresponding relationship between the outer boundary of the irregular rupture plastic zone and the main peak value of the maximum shear stress curve. However, the main peak value of the maximum shear stress curve has hysteresis with respect to the outer boundary of the plastic zone.
【作者单位】: 湖南大学土木工程学院;
【基金】:国家自然科学基金项目资助(51378195,51578232) 湖南省交通科技项目资助(201224)
【分类号】:TU45
【正文快照】: 随着矿产资源开挖深度逐渐增加,深部地下工程在社会发展过程中承担着越来越重要的角色,而对深部地下工程所产生的不同于浅部地下工程的拉-压区交替出现、间隔断裂、非规则破裂化、分层断裂等现象的研究就更显重要。以有研究成果[1]表明,深部地下工程所出现的这些超常现象与深
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