推覆构造的动力学特征及其对瓦斯突出的作用机制  

Nappe structure's kinetic features and mechanisms of action to coal and gas outburst

作　　者：韩军[1,2] 张宏伟[1] 张普田[2] 

机构地区：[1]辽宁工程技术大学资源与环境工程学院,辽宁阜新123000 [2]开滦(集团)有限责任公司,河北唐山063000

出　　处：《煤炭学报》2012年第2期247-252,共6页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(51104085);中国博士后科学基金资助项目(20100471477);高等学校博士学科点专项科研基金资助课题(20102121120007)

摘　　要：逆冲推覆和重力滑覆的共性特征是存在一个以相对低的强度和高的剪切应变为特征的滑脱面或拆离层,分隔着其上下力学性质和应变特征不同的两盘。推覆构造对煤与瓦斯突出的作用机制主要表现为2个方面:①推覆构造形成过程中低角度滑动对煤体产生广泛的压剪作用,使得煤层作为相对软弱层面结构发生广泛的层域破坏和面域破坏,构造煤非常发育;②推覆构造的挤压应力环境以及地层增厚效应为瓦斯赋存提供了有利条件,低角度的主滑断裂面(大多为逆断层或逆掩断层)往往构成较好的瓦斯封闭系统,对瓦斯的赋存起一定的控制作用;推覆构造派生的具有压性特征的结构面形成了对煤层瓦斯系统的封闭作用。总体上推覆构造对煤与瓦斯突出的作用机制体现在其为煤与瓦斯突出创造了物质基础——高含量的瓦斯和低强度的煤体。The common character of thrust structure and gravity sliding is that there has a detachment plane with low strength and high shearing strain, which separates the upper wall and footwall which with different mechanical property and strain characteristic. The role of nappe structure for coal and gas outburst is thought 2 ways：（!） the compression during nappe structure formation makes the coal structure destroyed, some time is whole layer included, and other is at structural plane. So the soft coal is extensively developed;（~） the compressive stress environment and strata thicken effect make a good condition for gas storage. Low-angle main slide fracture （most is reverse fault or overthrust fault） always forms a better gas closed system and it controlls gas storage. Structural with compression character derived by nappe structure form gas closed system, too. So the mechanisms of action of nappe structure to coal and gas outburst is that creating the material foundation：large quantity gas and soft coal for coal and gas outburst.

关 键 词：推覆构造 煤与瓦斯突出 动力学模式 构造煤 

分 类 号：TD713.1[矿业工程—矿井通风与安全]