中国煤矿矿区地应力场特征与断层活动性分析

地应力场研究是岩石力学与采矿工程中的一项重要工作,随着煤矿向深部开采,地应力的作用更加凸显。通过回归分析优化处理后的中国煤矿矿区219组实测地应力数据,对中国煤矿矿区地应力场分布特征及其与断层活动性的关系有一些新的认识。目前中国煤矿矿区的地应力场类型主要以σ_H>σ_h>σ_v型和σ_H>σ_v>σ_h型为主,但σ_H>σ_v>σ_h型居多;研究区以高地应力值矿区居多,中等应力和超高应力值矿区也占有一定比例,低应力值矿区最少;最大水平主应力、最小水平主应力与垂直主应力均随深度呈几乎线性增长关系,水平构造应力处于主导地位;随着埋深的增加,3个侧压系数呈现减小的趋势,KH向1.31趋近,Kh向0.74趋近,Kav向1.03趋近;水平差应力值分布离散,其大小范围为0.85~19.51 MPa,平均为8.80 MPa;最大与最小水平主应力的比值主要集中在1.50~2.00;在当前的应力状态下,摩擦因数取0.6,1.0时,研究区断层不易出现滑动失稳现象,在整体评价研究区断层稳定性时,断层滑动失稳标准取摩擦因数为0.6比较合适。

Problems and countermeasures on main mineral resource sustainable supply in northeastern China

northeastern China is an important old industrial base in China. Mineral resources are the foundation of industry development. However, because of long-term exploitation of mineral resources in northeastern China, the mineral resources reserves decrease gradually and some mineral resources are nearly exhausted, which restricts revitalization and sustainable development of the northeast old industrial base. On the basis of the comprehensive analysis of development and utilization status of mineral resources and supply and demand situation of main mineral resources in northeastern China, the authors put forward countermeasures on main mineral resources sustainable supply in northeastern China.