摘要
为了研究岩体工程中大量出现的层状复合岩体特殊力学性质,采用电子显微镜观察了他们的三维网状微结构特征和初始损伤.分析了层间结合状态和各亚层的应力σ1+,σ2+,σ3+和应变iε以及其他力学参数E,h,I等对层状复合岩体力学特性的不利影响.试验研究表明:层状复合岩梁中的应力jσ与第j层的Et,层间抗剪强度iτ以及荷载性质密切相关,而挠度是复合岩梁尺寸及弹性模量等参数的函数.不同岩石构成的层状复合岩体表现出各自特殊的变形与破坏特性.岩体的工程强度及抗变形能力随着层间结合力的下降、层间厚度的减小和岩石约束的降低而降低,而破坏的时间及变形量则会增大.
The special mechanical characteristics of stratified composite rock commonly seen in geotechnical engineering were investigated. Their 3D reticulated microstructure and original damage were observed under the scanning electron microscopy. Influence factors on mechanical characteristics of stratified composite rock were analyzed, which include joint state between layers, stresses σ1＋ ,σ2＋, σ3＋ and strain εi and other mechanical parameters E, h, and I of secondary layers. The experiments show that the stress σi in the composite rock beam is closely related with Et of layer j, shearing strength τi between layers and the load type. The deformation of the composite rock beam is the function of their width, height, elastic modulus and other parameters. The stratified composite rock mass composed of different rocks has a particular feature of deformation and breakage different from each other. The engineering strength of the rock mass decreases with the reduction of the combination force between layers, the thinning of layers, and the decrease of side pressure of the stratified composite rock, while at the same time. the interval of breakage and deformation increases.
出处
《采矿与安全工程学报》
EI
北大核心
2006年第2期187-191,共5页
Journal of Mining & Safety Engineering
基金
四川省教育厅重点科研项目(0426108)
关键词
岩石力学
损伤
微结构
层状复合岩体
rock mechanicals
damage
microstructure
stratified composite rock
