降雨条件下顺层岩质边坡破坏模式及稳定性研究
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摘要
在降雨入渗过程中,顺层岩质边坡后缘张裂隙的充水高度应由汇入流量与地下水在层面渗流时的渗流量所共同决定。通过分析降雨作用下顺层岩质边坡的滑移-拉裂破坏模式,建立了地下水渗流量与汇入流量和张裂隙充水量之间的关系,并推导了边坡稳定性系数与降雨强度的计算公式,编制了相应的计算程序。并以某高速公路路堑边坡为例,与不考虑层面渗流量的方法进行对比分析。结果表明,文中方法能够较好地反映边坡稳定性随降雨强度而变化的程度。
In the actual process of rainfall infiltration,the water filling height of bedding rock slope trailing edge tension fissure should be decided by import flow and seepage flow when underground water in the level of seepage.Through analyzing the sliding-tension failure mode of bedding rock slope under the condition of rainfall,we established the relationship between the groundwater seepage,import flow and the tension fissure filling water.,A formula to calculate the coefficient of stability of slope and rainfall intensity was derived.The corresponding calculation program was compiled.We comparatively analyzed considering the level seepage flow method or not considering the level seepage flow method based on highway cutting slope.Results show that this method can better reflect the slope stability varies with rainfall intensity degree.
In the actual process of rainfall infiltration,the water filling height of bedding rock slope trailing edge tension fissure should be decided by import flow and seepage flow when underground water in the level of seepage.Through analyzing the sliding-tension failure mode of bedding rock slope under the condition of rainfall,we established the relationship between the groundwater seepage,import flow and the tension fissure filling water.,A formula to calculate the coefficient of stability of slope and rainfall intensity was derived.The corresponding calculation program was compiled.We comparatively analyzed considering the level seepage flow method or not considering the level seepage flow method based on highway cutting slope.Results show that this method can better reflect the slope stability varies with rainfall intensity degree.
引文
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[2]刘才华,徐健,曹传林,等.岩质边坡水力驱动型顺层滑移破坏机制分析[J].岩石力学与工程学报,2005,24(19):3529-3533.
[3]何满朝,姚爱军,鹿粗.边坡岩体水力学作用的研究[J].岩石力学与工程学报,1998,17(6):662-666.
[4]刘才华,陈从新,冯夏庭.地下水对库岸边坡稳定性的影响[J].岩土力学,2005,26(3):419-422.
[5]何满朝,姚爱军,鹿粗.边坡岩体水力学作用的研究[J].岩石力学与工程学报,1998,17(6):662-666.
[6]邓荣贵,周德培,李安洪,等.顺层岩质边坡不稳定岩层临界长度分析[J].岩土工程学报,2002,24(2):178-181.
[7]冯君,周德培,江南,等.顺层岩质边坡顺层滑动岩体范围分析[J].山地学报,2007,25(3):376-379.
[8]张倬元,王士天,王兰生.工程地质分析原理[M].北京:地质出版社,1994.
[9]JT J018-97公路排水设计规范[S].北京:人民交通出版社,1997.