本文關鍵詞：貫通型單臺階巖體結(jié)構面剪切性質(zhì)及應用　出處：《中南大學學報(自然科學版)》2016年06期 　論文類型：期刊論文

  更多相關文章： 巖體力學 結(jié)構面 剪切變形 剪切強度 顆粒流

【摘要】：利用二維顆粒流(PFC2D)方法模擬研究臺階高長比(H/L)對貫通型單臺階巖體結(jié)構面剪切變形及強度影響。研究結(jié)果表明:臺階損傷破壞模式可分為壓切和張剪破壞2種基本類型,隨著H/L增大,壓切模式逐漸轉(zhuǎn)化為張剪模式,但其與法向應力基本無關。當臺階張剪損傷破壞時(H/L0.45),受彎矩及剪切力偶合作用,臺階根部易張裂;當臺階壓切損傷破壞時(H/L≤0.45),主要受斜向上的剪切力作用而使其尖角剪斷,沿剪切面呈現(xiàn)明顯的爬坡效應,具剪脹特性。針對實際巖體結(jié)構面臺階高長比H/L常較小(壓切模式),建立同時考慮結(jié)構面爬坡與啃斷效應的剪切強度經(jīng)驗公式,并運用于邊坡穩(wěn)定性計算的參數(shù)取值。
[Abstract]:Simulation of step height to length ratio (H- / L) by using two-dimensional particle flow PFC2D method. The effect of shear deformation and strength on the structural plane of single step rock mass is studied. The results show that the damage and failure mode of step can be divided into two basic types: compression shear and tensional shear failure. With the increase of H / L, the compression shear mode is gradually transformed into tension-shear mode, but it is independent of normal stress. When the step is damaged by tension-shear damage, H / L _ (0.45) is subjected to the coupling of bending moment and shear force. The root of step is easy to crack; When the step is damaged by compression shear damage, H / L 鈮，

本文編號：1367716