地震荷载作用下含节理岩质边坡的破坏机理

以汶川地震为背景,采用UDEC数值模拟,以什邡八角镇实测的"5.12"汶川地震波作为原始波形,对地震荷载作用下,含一条节理面岩质边坡滑移、拉裂破坏的过程进行了研究。结果表明:岩石边坡破坏模式为块体沿节理面的滑移破坏,并伴随着上方岩体拉裂破坏;节理刚度主要影响边坡前期相对位移大小及塑性区的产生,其后期拉裂区的扩展模式基本是一致的;节理面倾角较小时,边坡岩体仅在节理与坡顶、坡面交叉区域产生小范围的拉裂破坏,随着倾角的增大,边坡的相对位移及拉裂塑性区都显著增大。

Failure Mechanism of Rock Slope with Joint Under the Seismic Load

"5 .12" Wenchuan earthquake waves measured at the site of Shifang Bajiaozhen were taken as the original waveform to study the single joint surface rock slope sliding and the process of tension damage under the seismic load by using the UDEC numerical simulation .The results shows that the rock slope failure mode is simple slip failure of rock block along joint surface which is accompanied by tension damage of the above rock ;the joint stiffness mainly affects the slope relative displacement and formation of plastic zone in earlier stage ,the expansion patterns of the tension fracture zone are basically consistent in later stage ;when the joint surface angle is small ,a small scale tension damage will occur in the cross region of joint ,top and surface of slope rock ,as the angle increases ,the slope relative displacement and ten-sion fracture plastic zone increase significantly .