煤系古风化砂土岩层接触面高压剪切试验研究  

Study on high pressure shearing test on contact surfaces of coal based paleo-weathered sand-soil rock strata

作　　者：丁卿峰[1] 李文平[1,2] 白汉营[1,2] 岳艳艳[1] 

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221116 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州2211116

出　　处：《煤炭科学技术》2015年第12期40-45,共6页Coal Science and Technology

基　　金：国家自然科学基金资助项目(41172290)

摘　　要：为了研究煤系古风化砂土岩层接触面在开采扰动影响下土与岩石间的相互作用，进行了砂土-风化岩接触面在6～10MPa高应力下剪切试验，得到了高应力下砂土-风化岩接触面的应力-应变（T-γ）曲线。结果表明：高应力作用下剪切过程具有明显的阶段性，分为土岩相互咬合阶段和相互作用阶段；2阶段的转换涉及土颗粒材料和岩石材料的破碎，颗粒启动及材料破碎的,T-γ曲线斜率减小具有一致对应关系，而材料破碎效应与T-γ曲线的硬化或软化特征相关。据T-γ曲线分段特征，以初始抗剪强度和最终抗剪强度更能表征砂土-风化岩接触面剪切特征。接触面起伏特征以分形维数表示，并分析了材料破碎效应与砂土-风化岩接触面起伏特征的相关性及其响应规律。In order to study the interaction between the soil and rock of＂ the coal based paleo- weathered sand-soil rock strata contract sur- faces under the influence of the mining interference, a high pressure （6- 10MPa） shearing test was conducted on the interaction of the sandy soil-weathered rock contact surfaces. A T-γ curve of the sandy soil-weathered rock contact surfaces under the high stress was ob- tained from the test. The test showed that the shearing process under the high stress level would have obvious stages and they would be an inter-occlusion stage of the soil-rock and an interaction stage individually. The conversion of the two stages would relate to the crushing of the soil particle material and the rock material,the particle startup - material crushing T-γ curve inclined rate reduced would have a con- sistency corresponding relationship and the material crushing effect would have a closed related to the strain hardening or softening teatures of the T-γ curve. According to the sectional features of the T-γ curve, the initial shearing strength Tini and the final shearing strength T-ult would be more favorable to explain the shearing features of the sandy soil-weathered rock contact surfaces. The fluctuation features of the contact surfaces were explained with the fraetal dimension. The paper analyzed the material crushing effect and the relativity and response taw on the fluctuatiou features of the sandy soil-weathered rock contact surface.

关 键 词：深部土一风化岩接触带 相互作用 高压剪切试验 分形维数 材料破碎 

分 类 号：TD351[矿业工程—矿井建设]