STUDY OF STRESS STATE OF COAL PILLAR IN FAILURE ZONE OF COAL SEAM UNDER DYNAMIC PRESSURE OF MINING
WANG Hongwei1，JIANG Yaodong1，2，DENG Baoping3，ZHAN Shaojian1
(1. School of Mechanics and Civil Engineering，China University of Mining and Technology，Beijing 100083，China；2. State Key Laboratory of Coal Resources and Safe Mining，China University of Mining and Technology，Beijing 100083，China；3. Shanxi Coking Coal Group Co.，Ltd.，Taiyuan，Shanxi 030000，China)
Abstract：The field investigation of the geological conditions，the physico-mechanical characteristics of the surrounding rock and the hydrological conditions of mining areas in Fenxi，together with an intensive geological detection with the method of transient electromagnetic in the typical failure zones in Xinliu coal mine was carried out. A similarity model of the failure zones was developed based on the results of the geological detection and the stress state in the pillar affected by the dynamic pressure during mining was studied. The stress state of pillar changes little and remains the initial state within a period of time in the process of longwall mining. The increase of pillar stress occurs firstly at the distance of 62.5 m ahead of the working face，while a significant accumulation appears at the pillar 12.5–25.0 m ahead of the longwall mining face. In the process of pillar extraction，the high compression stress controls the elastic core in the pillar and remains at a high level under the effect of dynamic pressure. Meanwhile，the elastic core moves forward along with the advancing of the longwall mining face and bring about the severe risks to the coal mine. Therefore，the elastic core should be destroyed by pre-unloading，so as to ensure the safety in pillar extraction.
王宏伟1，姜耀东1，2，邓保平3，詹绍建1. 工作面动压影响下老窑破坏区煤柱应力状态研究[J]. 岩石力学与工程学报, 2014, 33(10): 2056-2063.
WANG Hongwei1，JIANG Yaodong1，2，DENG Baoping3，ZHAN Shaojian1. STUDY OF STRESS STATE OF COAL PILLAR IN FAILURE ZONE OF COAL SEAM UNDER DYNAMIC PRESSURE OF MINING. , 2014, 33(10): 2056-2063.
翟新献，钱鸣高，李化敏，等. 小煤矿复采煤柱塑性区特征及采准巷道支护技术[J]. 岩石力学与工程学报，2004，23(22)：3 799-3 802. (ZHAI Xinxian，QIAN Minggao，LI Huamin，et al. Characteristics of plastic zone of second mining pillar and support technology of gateway in small mines[J]. Chinese Journal of Rock Mechanics and Engineering，2004，23(22)：3 799-3 802.(in Chinese))
[4]
白登海，MEJU M A，卢 健，等. 时间域瞬变电磁法中心方式全程视电阻率的数值计算[J]. 地球物理学报，2003，46(5)：697-704.(BAI Denghai，MEJU M A，LU Jian，et al. Numerical calculation of all-time apparent resistivity for the central loop transient electromagnetic method[J]. Chinese Journal of Geophysics，2003，46(5)：697-704.(in Chinese))
[5]
张运霞，韩自豪，周建雄，等. PROT EM67D 瞬变电磁仪器在矿井水文地质勘探中的应用效果[J]. 工程地球物理学报，2005，2(2)：123-128.(ZHANG Yunxia，HAN Zhihao，ZHOU Jianxiong，et al. The application effect of mining hydrogeological exploration using PROT EM67D system[J]. Chinese Journal of Engineering Geophysics，2005，2(2)：123-128.(in Chinese))
<body>Your browse does not support frame!</body>
2014, Vol. 33 
