古今构造应力的对比与危险性评价研究

Comparicon of ancient and present tectonic stress and risk evaluation

以山西晋城成庄煤矿区为例,根据历史构造作用留下的褶皱、节理、断裂等构造形迹,建立构造格架,推断晋城成庄矿区历史上曾发生先南北向、后东西向的两期大的构造运动,古构造作用为先东西向加载60MPa,再南北向加载110 MPa,现今构造应力是与古构造应力方向一致.岩石内摩擦角是描述地质体抵抗破坏能力的重要参数,探讨了由于内摩擦角的不均匀性导致均匀古应力场作用下煤矿区的危险性分区,以及现今构造应力作用下矿区的稳定性问题,为煤矿区安全问题提供新的研究思路.数值模拟揭示晋城成庄煤矿危险区分东、西两带,该结论对煤层地质体应力集中带和瓦斯突出区的预测具有重要的意义.

Taking Chengzhuang coal mining of Jincheng in Shanxi province as an exampie,according to, the structural features formed by anicent tectonism such as fold, joint, cracking and son on, the tectonic framework was established to deduce the two large tectonic movement whcih was north-south direction at first and then east-west direction happened in Chengzhuang coal mining of Jincheng. The ancient tectonism stressed 60 MPa along east-west direction firstly and then 110 MPa along north-south direction. And the direction of present tectonic stress was the same as that of ancient one. The internal friction anagle of lock （φ） is an important parameter for describing the capacity of geologic body to hesist damage, so the effects of φ on lisk area under the homogeneous ancient tectonic stress field and the stability of mining area under the present tectonic stress dere discussed to provide novel approach for the mining area salty. The numerical simulation revealed that the possible risk area of Chengzhuang Coal Mining of Jincheng in Shanxi Province was separated into eastern zone and western zone, which has great significance in prediction of tectonic stress belt and firedamp area of loal geologic body.