基于PFC2D的浅埋深煤层矿压显现规律分析  

Analysis on Ground Behavior Law of Shallow Coal Seam Based on PFC2D

作　　者：毕忠伟[1,2] 

机构地区：[1]煤炭科学研究总院矿山安全技术研究分院,北京100013 [2]煤炭资源高效开采与洁净利用国家重点实验室,北京100013

出　　处：《矿业安全与环保》2013年第3期43-46,共4页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(50904036);国家重点基础研究发展计划(973计划)项目(2012CB724208)

摘　　要：针对杨家村矿的地质条件,利用PFC2D数值计算软件,建立了一个长130 m、高100 m,分别为煤、细粒砂岩、粉砂岩、风积沙岩层的模拟模型,对浅埋深厚松散层煤层的矿压显现规律进行了分析。研究发现:回采过程中岩层的结构依次为拱结构—悬臂梁结构;矿压显现规律为拱内岩石自重—拱内岩石自重+风积沙自重(初次来压)—悬臂梁破断角下方的岩石自重(平时的矿压)—整个破坏范围内岩石的自重+破断范围内风积沙自重(周期来压)。To counter the geological conditions of Yangjiacun Mine, a 130m-long and lOOm-high simulation model composed of coal, fine-grained sandstone, sihstone and aeolian sandstone was built by using PFC2D numerical calculation software, and the analysis was conducted on the ground behavior law of the loose coal seam with shallow depth. It was found in study that the structure of the rock strata in the mining process is the arch structure-cantilever structure; the ground behavior law is the rock weight within the arch-the rock weight within the arch ＋ the weight of aeolian sand （ first weighting） -the weight of rock under the braking angle of the cantilever beam （the usual ground pressure）-the weight of rock in the whole broken scope ＋ the weight of aeolian sand in the breaking scope（ the periodical weighting）.

关 键 词：浅埋深 压力拱 风积沙 PFC2D 矿山压力 

分 类 号：TD32[矿业工程—矿井建设]