自然及饱水状态下煌斑岩力学特性试验研究  

Experiment Research on Mechanical Property of Lamprophyre in Nature and Saturated Conditions

作　　者：李振[1] 郭军[1] 冯佳瑞 冯国瑞[1] 郭育霞[1] 

机构地区：[1]太原理工大学矿业工程学院,太原030024

出　　处：《地下空间与工程学报》2014年第5期1039-1046,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金面上项目(51174142);国家科技支撑计划项目(2009BAB48B02;2009BAB48B03);教育部新世纪优秀人才支持计划资助项目(NCET-11-1036);霍英东教育基金2011年高等院校青年教师基金应用研究课题(132023);山西省科技成果推广项目(2013071050)

摘　　要：为了探究煌斑岩层状大面积侵入条件下特厚煤层综放开采矿压显现异常的机理,分别对自然及饱水状态下煌斑岩进行了单轴压缩、巴西劈裂和变角剪切试验等力学试验研究。结果表明:两种状态下煌斑岩在单轴压缩试验峰前均经历了孔隙压密、弹性变形、塑性变形三个阶段,但自然状态下煌斑岩弹性变形阶段很长、塑性变形阶段很短,由峰后曲线可知饱水和自状态下煌斑岩分别属于Ⅰ类稳定破裂型岩石和Ⅱ类非稳定破裂型岩石;自然状态下煌斑岩单轴抗压强度平均为114.53 MPa,饱水抗压强度比自然状态降低了39.7%;由巴西劈裂试验知自然状态下煌斑岩平均抗拉强度为8.63 MPa,饱水后煌斑岩的抗拉强度比自然状态降低了42.4%;由变角剪切试验分别获得了两种状态下煌斑岩的强度曲线方程,并得到了两种状态下煌斑岩的内聚力和内摩擦角,饱水后内聚力内摩擦角分别下降了21.8%和1.6%。To explore the mechanism of abnormal mining press under special thick seam mining with lots of lamprophyre layered invade conditions, we made uniaxial compressive indirect tensile and angle changed shear tests on lamprophyre in natural and saturated states. The study shows： there are three deformation sections for both natural and saturated lamprophyre under uniaxial compressive deformation before the peak strength, but the nature one has long elastic but short plastic sections , after peak strength the saturated lamprophyre and natural one have the property as shown in Curve I and Curve II, respectively; The average compressive strength of natural lamprophyre is 114. 53 MPa and that for saturated specimens is lower than the natural state by 39.7% ; indirect tensile tests show that the average tensile strength of natural lamprophyre is 8.63 MPa and reduced by 42.4% after saturation; the angle changed shear tests gave the strength curve equation of lamprophyre in two states, and the cohesion and friction angle of the lamprophyre in two states were found, the cohesion and friction angle of saturated lamprophyre reduced by 21.8% and 1.6% compared with those of natural ones.

关 键 词：煌斑岩 自然状态 饱水状态 力学特性 试验研究 

分 类 号：TU452[建筑科学—岩土工程]