不同温度变化下海测滩煤矿岩体物理力学特性分析  

Analysis of physical and mechanical properties of coal and rock mass in Haichatan Coal Mine under different temperature changes

作　　者：李波 汪隆 LI Bo;WANG Long(Shaanxi Yanchang Petroleum Jingbian Coal Industry Co.,Ltd.,Yulin 719000,China)

机构地区：[1]陕西延长石油靖边煤业有限公司,陕西榆林719000

出　　处：《煤炭科技》2024年第6期20-24,共5页Coal Science & Technology Magazine

摘　　要：冻结状态下岩石的物理力学性能指标是冻结法设计的主要依据。以海测滩井田主、副井筒所穿岩层为研究对象,通过单轴、三轴压缩试验,研究了在-5、-10和-15℃3种不同温度下,中粒砂岩、泥岩以及粗粒砂岩的力学特性及破坏特征。研究结果表明,3类岩石的弹性模量和单轴抗压强度与温度呈负相关关系,泊松比与温度呈正相关关系;岩性较硬的中粒砂岩和粗粒砂岩三轴抗压强度随着温度的降低呈现出先增大后减小的趋势,而岩性较软的泥岩呈现出增大趋势;低温条件下,岩石三轴压缩试验的破坏特征主要是以斜向剪切为主。The physical and mechanical properties of rock under freezing state are the main basis for the design of freezing method.Taking the rock strata of the main and auxiliary shafts in Haicetan mine field as the research object,the mechanical properties and failure characteristics of medium-grained sandstone,mudstone and coarse-grained sandstone at three different temperatures of-5,-10 and-15℃were studied by uniaxial and triaxial compression tests.The results show that the elastic modulus and uniaxial compressive strength of the three types of rocks are negatively correlated with temperature,and Poisson′s ratio is positively correlated with temperature.The triaxial compressive strength of medium-grained sandstone and coarse-grained sandstone with hard lithology increases first and then decreases with the decrease of temperature,while the mudstone with soft lithology shows an increasing trend.The failure characteristics of rock triaxial compression test under low temperature conditions are mainly oblique shear.

关 键 词：冻结岩石 冻结温度 单轴压缩 三轴压缩 

分 类 号：TU443[建筑科学—岩土工程]