多期构造运动影响下区域地应力场特征及其对冲击地压的影响

Effects of multi-stage tectonic movement on regional tectonic stress characteristics and rockburst

通过对双鸭山煤田构造演化及成煤构造特征的分析,结合煤田内部低序次构造分布特征及7个矿井不同开采水平的22个测点的地应力实测结果,得出双鸭山煤田以东西向弧形构造和新华夏系构造控制为主并将其由西到东分为安邦河区、扁石河区和七星河区3个区段。分析了主体张性构造应力控制下雁阵式构造、帚状构造等低序次构造分布规律及伴生特征,得出煤田属以水平应力为主且最大主应力量值大多在30 MPa以上的σH>σh>σv型高地应力场。实测所得地应力数据离散型较大但最大主应力、侧向压力系数以及水平差应力整体上均随深度的增加而增大的规律。从区域构造作用及局部采场应力特征的角度分析了东保卫煤矿冲击地压事故的原因和影响因素,为煤田矿井深部区域动力区划和开拓布局提供了划分依据方向和设计建议。

Based on the characteristics of tectonic evolution and coal-forming activities, as well as the distribution of subordinate structure and the in-situ stress measurement results at 22 points in 7 coal mines of Shuangyashan coal field, it’s obtained that coal mining areas is primarily controlled by the east-west arcuate structure and new cathaysian tectonic. Meanwhile, it can be divided into three sections from east to west, i.e. Anbang river, Bianshi river and Qixing river. The distribution law of subordinate structures such as en-echelon structure, brush structure and the associated structure under principal tensional tectonic stress was analyzed. Affected by the composite superimposition of multi-stage tectonic movement, though the discreteness of stress measurement data is great. The horizontal stress increases with the increase in depth. The value of maximum horizontal principal stress is more than 30 MPa, the type of stress field follows σH>σh>σv. The causes and influence factors of rockburst accident in Dong baowei coalmine was analyzed from perspectives of regional tectonic stress and local mining stress,which could provide development direction and design suggestion for geo-dynamic division and mining layout in deep coalmining.