红层岩石微观特性与抗压强度关系试验研究  

Experimental study on the relationship between micro-characteristics and compressive strength of the red bed rock

作　　者：李硕标[1] 陈剑[1] 易国丁[2] 

机构地区：[1]中国地质大学工程技术学院,北京100083 [2]中国地质大学地球科学与资源学院,北京100083

出　　处：《工程勘察》2013年第3期1-5,共5页Geotechnical Investigation & Surveying

基　　金：国家自然科学基金青年科学基金项目(40901005);中央高校基本科研业务费资助项目(2011YXL054);大学生创新性实验计划项目(2011CXY033)联合资助

摘　　要：岩石的微观特性对其宏观力学性质具有重要影响,目前关于红层岩石微观结构与抗压强度的定量关系尚缺乏系统的研究。本文对四川屏山县红层岩石取样进行了单轴压缩试验,利用偏光显微镜和扫描电镜对其微观特性进行了观察。通过对红层砂岩、粉砂岩、泥岩的单轴抗压强度和微观特性的试验分析与对比,得出了红层岩石单轴抗压强度与矿物成分、矿物含量、胶结物类型等微观特性之间的一些函数关系。试验结果表明:石英和粘土矿物的含量对红层岩石的单轴抗压强度影响最大。石英含量与红层岩石单轴抗压强度呈现正相关,粘土矿物含量与红层岩石单轴抗压强度呈负相关。当矿物含量基本相同时,岩石内颗粒分布均匀的岩石单轴抗压强度明显高于颗粒分布不均匀的岩石。There is the close relationship between the micro-characteristics and the mechanical properties of rocks, but the comprehensive study on the relationship between micro-characteristics and compressive strength of red bed rock is lack of at present. The red bed rock samples from Pingshan County of Sichuan Province are used for uniaxial compression tests, and the polarizing microscope and scanning electron microscopy （SEM） are used to observe their micro-characteristics. The comparative analysis between the uniaxial compressive strength and the micro-characteristics of the sandstone, silty sandstone and mudstone in the red bed weak rock are carried out, and some function relationship between the micro-characteristics （mineral composition, mineral content, cementation content type and so on） and the uniaxial compressive strength are obtained. The test results show that quartz and clay mineral content are the main factors to influence the uniaxial compressive strength of red bed weak rock. The positive correlation between quartz content and uniaxial compressive strength of red bed weak rock is presented, while the negative correlation is presented between clay mineral content and uniaxial compressive strength.

关 键 词：红层 微观特性 抗压强度 相关性 

分 类 号：TU458[建筑科学—岩土工程] P585.1[建筑科学—土工工程]