残积土地区不同削坡角度边坡稳定性研究
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摘要
针对花岗岩残积土地区削坡建房引发的地质灾害,研究降雨条件下不同削坡坡度对边坡稳定性的影响。选取梅州典型边坡案例,采用大型岩土数值分析软件SEEP/W进行地下水流动稳态分析,在此基础上再进行持续降雨条件下瞬态分析,获得孔隙水压力导入SLOPE/W模块计算稳定性系数。得出降雨和削坡综合影响使得边坡稳定性急剧下降,在持续72 h暴雨条件下,建议梅州花岗岩残积土地区坡高为12 m的边坡削坡值不超过65°,为探讨边坡灾害防治提供了一定的理论依据。
In view of the geological disasters caused by the construction of houses in granite residual soil areas,the effects of different slopes on the slope stability under rainfall conditions are studied. The typical slope case of Meizhou was selected. The large-scale geotechnical numerical analysis software SEEP/W was used to analyze the steady state of groundwater flow,and then the transient analysis under continuous rainfall conditions was carried out to obtain the calculated stability coefficient of pore water pressure into SLOPE/W module. It is concluded that the comprehensive effect of rainfall and slope cutting makes the slope stability decrease sharply. Under the condition of continuous rain for 72 h,it is recommended that the slope of the slope with a slope height of 12 m in the Meizhou granite residual soil area should not exceed 65°,in order to discuss the prevention and control of slope disasters. Provide a certain theoretical basis.
In view of the geological disasters caused by the construction of houses in granite residual soil areas,the effects of different slopes on the slope stability under rainfall conditions are studied. The typical slope case of Meizhou was selected. The large-scale geotechnical numerical analysis software SEEP/W was used to analyze the steady state of groundwater flow,and then the transient analysis under continuous rainfall conditions was carried out to obtain the calculated stability coefficient of pore water pressure into SLOPE/W module. It is concluded that the comprehensive effect of rainfall and slope cutting makes the slope stability decrease sharply. Under the condition of continuous rain for 72 h,it is recommended that the slope of the slope with a slope height of 12 m in the Meizhou granite residual soil area should not exceed 65°,in order to discuss the prevention and control of slope disasters. Provide a certain theoretical basis.
引文
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[3]曾玲玉.广东梅州崩塌滑坡地质灾害成因及防治对策[J].四川地质学报,2007(3):198-200.
[4]郭果,陈筠,李明惠,等.土质滑坡发育概率与坡度间关系研究[J].工程地质学报,2013,21(4):607-612.
[5]吴能森.结构性花岗岩残积土的特性及工程问题研究[D].南京:南京林业大学,2005.
[6]弗雷德隆德.非饱和土力学[M].北京:中国建筑工业出版社,2010.
[7]高华喜,殷坤龙.降雨与滑坡灾害相关性分析及预警预报阀值之探讨[J].岩土力学,2007,28(5):1055-1060.