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急斜煤层覆岩关键层对防水煤柱尺寸的影响
引用本文:李永明,刘长友,黄炳香.急斜煤层覆岩关键层对防水煤柱尺寸的影响[J].采矿与安全工程学报,2012,29(2):226-231.
作者姓名:李永明  刘长友  黄炳香
作者单位:1. 中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州221116;山西大同大学煤炭工程学院,山西大同037003
2. 中国矿业大学煤炭资源与安全开采国家重点实验室,江苏徐州,221116
基金项目:国家重点基础研究发展计划(973)项目
摘    要:为了对水体下急斜煤层的安全回采提供依据,基于龙湖煤矿南二采区急斜煤层的水文工程地质和煤岩层赋存条件,采用离散元UDEC2D数值计算,分析了覆岩关键层对急斜煤层开采导水裂隙分布和防水煤柱稳定性的影响,结果表明:当上覆岩层无关键层时,急斜煤层开采导水裂隙呈“耳型”分布,而当上覆岩层存在关键层时,导水裂隙以平行于岩层层面的离层裂隙为主,且随着煤层采厚的增加呈抛物线型增大趋势,硕板初次破断后导水裂隙向关键层及其上方岩层发育;急斜煤层覆岩关键层的存在,将明显增大防水煤柱的抽冒范围,水体更易沿防水煤柱塑性破坏区渗流进入工作面采空区.据此,现场设计了分带仰斜充填开采方法,并采取了加固防水煤柱的措施,有效确保了水体下急斜煤层的安全回采.

关 键 词:急斜煤层  关键层  导水裂隙  防水煤柱  流固耦合

Influence of Key Stratum on Waterproof Coal Pillar Size in Steep Seam
LI Yong-ming , LIU Chang-you , HUANG Bing-xiang.Influence of Key Stratum on Waterproof Coal Pillar Size in Steep Seam[J].Journal of Mining and Safety Engineering,2012,29(2):226-231.
Authors:LI Yong-ming  LIU Chang-you  HUANG Bing-xiang
Affiliation:1(1.State Key Laboratory of Coal Resources and safe Mining,China University of Mining & Technology,Xuzhou, Jiangsu 221116,China;2.School of Mining Engineering,Shanxi Datong University,Datong,Shanxi 037003,China)
Abstract:To provide theory basis for safety mining of steep seam under water body,the UDEC2D numerical calculation is used in this paper to analyze the influence of key stratum in overburden on wa-ter flowing fracture distribution and waterproof coal pillar stability,based on the occurrence conditions of coal-rock seams and hydrogeology conditions in South No.2 District of Longhu coal mine.The re-sults show that when there is no key stratum in overburden,the water flowing fracture in steep seam mining presents"ear style"distribution.When there exits key stratum in overburden,the water flowing fracture is mainly composed of bed separated fracture parallel to the bedding face,and will be parabolically increased in tendency with mining height.In addition,the water flowing fracture zone begins to develop upwards the key stratum and its upper strata after the first breakage of main roof.The exit of key stratum in steep seam can enlarge the falling range of waterproof pillar obviously,and the water body is more easily to enter into the goaf along the plastic failure zone of waterproof pil-lar.Hereby,the strip and up-dip backfilling mining method is designed,and the corresponding measures are adopted to reinforce the waterproof pillar,so as to ensure safety mining of steep coal seam under water body.
Keywords:steep coal seam  key stratum  water flowing fracture  waterproof pillar  fluid-solid coupling
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