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非贯通裂隙岩体试件峰后力学特性的研究
The study of post-peak mechanical properties to non-penetrating rock-like specimen
投稿时间:2019-10-28  修订日期:2020-05-12
DOI:
中文关键词:  三轴压缩  裂隙岩体  残余强度
英文关键词:Triaxial compression  Fractured rock mass  Residual strength
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
蒲诚 西安理工大学 1909488416@qq.com 
刘奉银 西安理工大学  
陈蕴生 西安理工大学  
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中文摘要:
      岩体峰后强度的研究对深部煤炭开采及隧道工程安全施工具有十分重要的意义。采用类岩石材料模拟岩体,通过预埋金属片后抽出的方式模拟岩体中的非贯通裂隙,利用三轴压缩试验获得全应力-应变曲线,研究围压及裂隙倾角对试件残余强度、试件峰后塑性、粘聚力和内摩擦角的影响。结果表明:裂隙对试件残余强度的影响主要是在高围压条件下,低围压下裂隙对试件残余强度的影响较小;试件峰后塑性特征受围压及裂隙倾角的共同影响,其中围压对试件峰后塑性特性起决定性作用,裂隙倾角仅在一定范围内影响试件峰后塑性;cr的大小与破坏方式及破坏程度有关,裂纹长度越大、试件破坏后形态越不完整,cr越小,fr的大小与裂纹表面的粗糙程度及裂纹数量有关,裂纹表面越粗糙、裂纹数量越多,fr越大;75°倾角裂隙试件在中高围压下会产生较为明显的剪切破坏进而导致峰后段应力的突然跌落。
英文摘要:
      The study of residual strength has great importance to safe tunnel construction and deep coal mining engineering. This article use rock-like materials to simulate rock mass, embedded sheet metal to simulate non-penetrating crack in rock mass, thus obtaining the stress-strain curve, analyzed the influence of confining pressure and crack inclination to the stress reduction rate, residual strength, and c and f . Finding that : The crack has little influence on the residual strength under low confining pressure, while has high influence under medium and high confining pressure. The post-peak plastic characteristics of specimen are affected by both confining pressure and crack angle, among which the confining pressure plays a decisive role in the post-peak plastic characteristics of specimen, while the crack Angle only affects the post-peak plastic within a certain range. The value of cr is related to the failure mode and failure degree, the longer the crack length and the more incomplete the specimen in after failure, the smaller cr is; and the value of fr is related to the roughness and number of cracks on the crack surface, the rougher the crack surface is and the more cracks there have, the higher the fr is. Finally, under high confining pressure, the specimen with a 75° crack angle have obvious shear failure, which will lead to the sudden drop of the stress in the post-peak section.
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