岩土力学2011，Vol.32Issue(11)：3288-3294,3305,8.
单轴压缩条件下锚杆对含三维表面裂隙试样的锚固效应试验研究
Experimental study of reinforced effect of bolt in 3D surface fractured specimens under uniaxial compression
摘要
Abstract
Three-dimensional surface fracture is set in specimens composed of rock similar material. In order to get the effect of bolts on strength and propagation mode of the pre-existing fracture, uniaxial compression tests are carried out on specimens with different anchorage modes. The results show that, comparing with the specimens without bolts, compressive strength and compression modulus of reinforced specimens increase in different degrees. Compression modulus of reinforced specimen is enhanced more significantly than compressive strength. Residual strengths of four types of reinforced specimens are approaching to each other with the value being about 3 to 3.5 times that of specimen without bolt. The failure process of anchored specimen is divided into four phases: ① initial fracture compression phase; ② micro-fractures developing phase; ③ unsteady failure phase; ④ post-failure phase. And the surface macro-fractures all appear in the post-failure phase. Due to the reinforced and crack arresting effect of bolts the mode of crack propagation changes. Curved fracture plane and low-shear-strength plane are found in the reinforced specimens. Three types of cracks are found in test, namely tensile crack, shear crack and tensile-shear mixed crack.关键词
单轴压缩/锚杆/三维表面裂隙/加固止裂作用/扩展模式Key words
uniaxial compression/bolt/3D surface fracture/reinforced and crack arresting effect/propagation mode分类
建筑与水利引用本文复制引用
张宁,李术才,李明田,吕爱钟..单轴压缩条件下锚杆对含三维表面裂隙试样的锚固效应试验研究[J].岩土力学,2011,32(11):3288-3294,3305,8.基金项目
国家自然科学基金资助项目(No.50874047).国家杰出青年科学基金(A类)资助项目(No.50625927) （No.50874047）
国家自然科学基金(No.40902083). （No.40902083）
