大尺度冲击性煤体电阻率变化规律的实验研究

英文篇名：The Experimental Study on the Apparent Resistivity of Large-scale Coal Samples with Burst Tendency
中文刊名：南华大学学报(自然科学版)
英文刊名：Journal of University of South China(Science and Technology)
作者：王云刚
英文作者：WANG Yun-Gang(School of Safety Science and Engineering ; Henan Polytechnic University ; Jiaozuo ; Henan 454003 ; China)
中文关键词：大尺度煤体 ; 冲击倾向性 ; 视电阻率 ; 前兆信息
英文关键词：large-scale coal samples ; burst tendency ; apparent resistivity ; precursory information
出版日期：2010-06-29
机构：河南理工大学安全科学与工程学院;
年：2010
期：02
出版单位：南华大学学报(自然科学版)

摘要

在未加载条件下对大尺度煤样的电阻率测试结果表明,在自然状态下煤样的电阻率较大;经过浸泡后其电阻率明显下降.在单轴压缩条件下的大尺度冲击性煤样电阻率实验表明,电阻率变化曲线整体上成不对称的"凹"型,基本符合二次曲线;煤样电阻率随压力增加逐渐减少,当达到一定的应力值时,电阻率达到最小值;继续加载,电阻率将升高,直到完全失稳.1#、3#和4#煤样单轴抗压强度与其受载过程中的视电阻率变化存在一定的正相关性;受载煤体的电阻率变化与其变形破裂过程中的裂隙分叉、发育、汇合贯通密不可分;兼有剪裂和拉裂特点的破坏类型可能是大尺度煤样较常见的破坏形式.
In this paper,the characteristics and rules of the apparent resistivity of large-scale coal samples with burst tendency are studied.Experiment results show that the apparent resistivity of coal samples are relatively large in natural state and decrease significantly after water immersion,and the apparent resistivity curves of coal samples in the uniaxial compression are like asymmetric concave type,which is basically in line with quadratic curve.The positive correlation between the uniaxial compressive strength and the apparent resistivity changes of 1#,3#,4# coal samples is studied and the apparent resistivity changes of coal samples under load are closely associated with the bifurcation,expand,confluence and connection of their cracks.The failure type with the characteristics of both shear fracture and tension crack have a good potential in the fundamental failure form of the large-scale coal samples.

引文

[1]Brace W F,Orange A S.Electrical resistivity changes insaturated rocks during fracture and frictional sliding[J].Geophys,Res,1968,73(4):1433-1445.
    [2]张天中,华正兴,徐明发.1.2千巴围压下岩样破裂和摩擦滑动过程中电阻率变化[J].地震学报,1985,7(4):428-433.
    [3]钱家栋,陈有发,金安忠.地电阻率法在地震预报中的应用[M].北京:地震出版社,1985.
    [4]Kurite K.How can we identify location of a fractureplane?-Anisotropy of electrical conductivity and seis-mic velocity in dilatancy[J].Earthq.Predict.Res.,1986,4(1/2):39-45.
    [5]陈大元,陈峰,王丽华.单轴压力下岩石电阻率的研究-电阻率的各向异性[J].地球物理学报,1983,26(增刊):783-792.
    [6]陈大元,修济刚,安金珍,等.岩石不同变形阶段电阻率变化各向异性特征研究[C]//中国地球物理学会年刊.北京:中国建材工业出版社,1996:207.
    [7]安金珍,修济刚,陈峰,等.单轴压力下有补给水岩石电阻率变化各向异性研究[J].中国地震,1996,12(3):300-306.
    [8]陈峰,修济刚,安金珍,等.用动态岩石电阻率变化各向异性探测岩石破裂前兆和确定主破裂扩展方向[J].地震学报,2000,22(2):210-213.
    [9]陈峰,安金珍,廖椿庭.原始电阻率各向异性岩石电阻率变化的方向性[J].地球物理学报,2003,46(2):271-280.
    [10]郝锦绮,冯锐,周建国,等.岩石破裂过程中电阻率变化机理的探讨[J].地球物理学报,2002,45(3):42-434.
    [11]张流,黄建国,高平.水对岩石变形过程中电阻率变化的影响[J].地震,2003,23(1):8-14.
    [12]杜云贵,鲜学福,谭学术,等.南桐煤的导电性质研究[J].重庆大学学报,1993,16(3):145-148.
    [13]何继善,吕绍林.瓦斯突出地球物理研究[M].北京:煤炭工业出版社,1999.
    [14]徐宏武.煤层电性参数测试及其与煤岩特性关系的研究[J].煤炭科学技术,2005,33(3):41-46.
    [15]王云刚.受载煤体变形破裂微波辐射规律及其机理的基础研究[D].徐州:中国矿业大学,2008.
    [16]刘贞堂,贾迎梅,王恩元,等.受载煤体电阻率变化规律研究[J].中国煤炭,2008(11):47-49.
    [17]曹亮.考虑过程区的混凝土断裂韧度尺寸效应研究[D].南京:河海大学,2006.