煤样强度特征的浆液量效应试验研究  

The experimental study of the grout quantity effect of strength properties of coal sample

作　　者：孔德中[1] 杨胜利[1] 张锦旺[1] 徐文彬[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《采矿与安全工程学报》2015年第3期420-425,共6页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2013CB227903);国家自然科学基金煤炭联合基金重点项目(U1361209);2014博士拔尖创新人才项目(800015Z650)

摘　　要：煤壁注浆加固技术是防治煤壁片帮的有效措施,其关键环节在于注浆量的选择。针对注浆量选择这一难题,设计了"一种破碎煤体与注浆再次成型"的实验方案,采用岩石力学试验机对不同浆液比重下煤样试件进行单轴抗压与楔形剪切试验。研究结果表明:浆液的存在延续了煤样的变形,减少了煤样试件的脆性破坏;存在一个合适的浆液比重使得煤样的单轴抗压强度、残余强度达到最大,大于或小于此比重,含浆液煤样强度都未达到最大;浆液的存在增加了煤样的抗剪强度,表现在增加了煤样内聚力,而对摩擦角影响不大。研究结果为现场注浆量的选择提供了理论基础。The coal wall grouting reinforcement technique is an effective measure to prevent and con-trol rib spalling, and its key procedure is the selection of grouting quantity. To overcome the difficulty in choosing the reasonable grouting quantity, an experimental scheme“The fragmentized and broken coal molded again with mixed slurry”has been designed. The uniaxial compressive and the wedge shear test of coal sample with different proportion of grout has been performed by using the rock mechanics test-ing machine. The study has shown that：the coal shows much less brittle failure because the grout in it can continue the deformation of the coal sample;the uniaxial compressive strength and residual strength of the coal sample can reach the maximum amount with an appropriate proportion of grout;the shear strength of coal sample is increased because of the grout in it, which is shown as the phenomena that the cohesion of coal sample is increased ,while the influence of friction is little. It has been concluded that the research result can provide the theoretical foundation for the selection of grouting quantity.

关 键 词：浆液比重 煤样 单轴压缩试验 楔形剪切试验 注浆加固 

分 类 号：TD45[矿业工程—矿山机电]