摘要
针对单一岩石界面的注浆加固强度问题,分析结构面剪切破坏机制以及黏结力与摩擦力的耦合效应,并开展规则锯齿状结构面剪切试验。对三维条件下结构面粗糙程度的各向异性及其表征方法进行分析。依据结构面微凸体倾角与剪切方向的关系,提出摩擦力主控区域与黏结力主控区域的划分。基于无黏结强度时结构面的抗剪强度准则,以及结构面黏结力作用机制,建立单一界面注浆加固体的抗剪强度计算公式,计算表明,注浆材料的黏结力作用受结构面粗糙度各向异性的影响显著。注浆加固后,结构面的抗剪强度沿各个方向均得到提升,但结构面的抗剪强度仍然存在明显的各向异性。研究结果为岩体注浆加固效果提供了评判依据。
To evaluate grouting reinforcement strength of single fracture surface,shearing failure mechanism of structural surface and coupling effect between cohesion force and friction force was analyzed. Shearing tests was conducted for regular saw-tooth structural surface. Anisotropy of surface roughness and its characterization methods was analyzed. According to the relationship between shearing direction and micro asperity of the structural surface,a conception of cohesion controlling area and friction controlling area was proposed. Based on failure criterion for non-cohesion structural surface and mechanism of cohesion force,a formula was established for shearing strength on one single surface of grouted rock. Calculation shows cohesion force is influenced by the asperity of surface roughness. Grouting reinforcement increases shearing strength of structural surface along all direction,while the asperity of shearing strength still exists. Research results may provide a method for evaluation on grouting reinforcement of fractured rock.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第A02期3915-3922,共8页
Chinese Journal of Rock Mechanics and Engineering
基金
国家自然科学基金青年基金项目(51309146)
教育部博士点基金(20130131120084)~~
关键词
岩石力学
注浆加固
结构面
裂隙岩体
抗剪强度
rock mechanics
grouting reinforcement
structural surface
fractured rock
shearing strength
