摘要
从分析潘一矿的煤与瓦斯突出分布规律及其附近控制性断裂构造特点出发,建立了求解竖向凹形圆弧断裂周围构造应力的简化的二维力学模型。导出了断层上盘中水平应力和垂直附加构造应力的解析解,由此推得在断层的上盘中存在一个范围较大的垂直应力升高区,升高后的垂直应力为自重应力的 2～3 倍,且垂直应力升高区的峰值距断层很近,这与数值模拟的结果完全一致。这一结论较好地解释了发生在断层上盘和发生在地壳浅层的煤与瓦斯突出现象,将有助于进一步深入研究煤与瓦斯突出机理和提出新的预测方法。
In the light of the distribution rule of coal and gas outburst and the tectonic characteristics of neighboring dominant faults in Panyi mine, a simplified two-dimensional mechanics model is set up to obtain the tectonic stresses around the concave-circular-arc fault. Then, the analytical solutions of horizontal and vertical tectonic stresses of the top wall of fault are derived. These analytical solutions show that there is an area where the vertical stress is increased to 2-3 times more than the rock weight induced stress, which is identical with the numerical simulation result. The study result can be applied to explain why the coal and gas outburst occurs in the top wall of fault and shallow lithosphere.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2004年第23期3984-3989,共6页
Chinese Journal of Rock Mechanics and Engineering
基金
国家重点基础研究发展规划(973)项目(2002CB412708)
国家"十五"攻关项目(2001BA803B0404)资助课题。
关键词
岩石力学
构造应力
解析解
煤与瓦斯突出
Gas bursts
Numerical methods
Rock mechanics
Stresses
Two dimensional
