三轴压缩煤岩强度及变形特征的试验研究  

Test study of coal's strength and deformation characteristics under triaxial compression

作　　者：杨永杰[1] 宋扬[1] 陈绍杰[1] 

机构地区：[1]山东科技大学资源与环境工程学院,山东青岛266510

出　　处：《煤炭学报》2006年第2期150-153,共4页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(50474029)

摘　　要：在MTS815岩石伺服试验机上对鲍店煤矿3煤进行了常规三轴压缩试验,并对试验结果进行了分析.结果表明:煤岩由于含有大量的微孔隙裂隙,在围压作用下,孔隙裂隙被压密闭合,弹性模量随之增大,但并非呈线性关系.在常规三轴压缩条件下,煤样三轴压缩强度与围压之间呈线性关系(不包括单轴压缩情况),在实验的围压范围内,煤岩破坏符合Coulomb强度准则,但由于煤样具有明显的非均质特性,其内部含有大量的随机裂隙等缺陷,且煤样黏聚力较低,煤样沿随机裂隙破裂偏离θ=45°+/2的可能性很大.The conventional triaxial compression test of No. 3 coal seam of Baodian Colliery was carried out with MTS815 servo-controlled rock mechanical test system and the strength and deformation characteristics were analyzed. The experimental results indicate that under the confining compression, fissures close due to the large quantity of micro fissures, and the modulus increase with it, but presents nonlinear relation. Under general triaxial compression, and triaxial compression strength of coal specimens and confining compression have good linear relation （the case of uniaxial compression excluded） , when the confining compression is less than maximum experimental compression, the destroy of coal mine fits the Coulomb criterion, but because of the obvious heterogenity of coal specimens, there are large quantity of flaws such as random fissures, and the cohesion is low, it is most possible for the random fissures of coal specimens deviate from θ=45°＋φ/2.

关 键 词：三轴压缩试验 煤岩强度 变形特征 围压 

分 类 号：TU458[建筑科学—岩土工程]