基于UDEC的某公路顺层边坡优化设计研究
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摘要
公路建设中经常会遇到顺层边坡,结构面倾角与坡面一致,对稳定形势不利,不合理开挖会加剧这种不利影响。以某公路顺层边坡为研究对象,从地质角度分析了其稳定性和破坏机制。在此基础上,建立了相对软弱层不同坡脚埋深厚度的工况,利用UDEC离散元软件对其进行了计算。经过对安全系数、位移矢量和塑性区计算结果的分析,发现软弱层角砾岩、泥灰岩埋深大于15 m坡体才是安全的,否则坡体会直接失稳,且滑体厚度较大,很难治理。
Rocky bedding slope is usually encounted in highway construction,where the dip angle of structure plane is consistent with the slope,which is unfavourable to slope stability,especially in the unrational excavation situation.Firstly,the failure mechanism and stability for highway rocky bedding slope is analysed with the geological method in this paper.Secondly the calculation for variant buried depth of the slope toe relative to soft stratum is conducted by using UDEC.Based on the analysis of calculation results for safety factor,displacement vector and plastic zone,it is found that the soft stratum(shatter belt and marlite) with the depth over 15 m is the critical dimension for the slope stability.
Rocky bedding slope is usually encounted in highway construction,where the dip angle of structure plane is consistent with the slope,which is unfavourable to slope stability,especially in the unrational excavation situation.Firstly,the failure mechanism and stability for highway rocky bedding slope is analysed with the geological method in this paper.Secondly the calculation for variant buried depth of the slope toe relative to soft stratum is conducted by using UDEC.Based on the analysis of calculation results for safety factor,displacement vector and plastic zone,it is found that the soft stratum(shatter belt and marlite) with the depth over 15 m is the critical dimension for the slope stability.
引文
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[8]金仁祥,杨良策,任光明,等.三峡库区某公路顺层岩质边坡变形特征分析[J].地质灾害与环境保护,2003,14(2):39-42.
[9]Cundall P A.Acomputer model for simulating progressivelarge scale movements in blocky systems[C]//Proceedings ofthe Symposiumof the International Society of Rock Mechan-ics,1971,1(Ⅱ):1-8.
[2]郭志.实用岩体力学[M].北京:地震出版社,1996.
[3]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):177-182.
[4]刘均.顺层边坡溃层问题的计算方法[J].水文地质工程地质,1997,(6):37-40.
[5]李树森,任光明,左三胜.层状结构岩体顺层斜坡失稳机理的力学分析[J].地质灾害与环境保护,1995,(2):24-29.
[6]李荣强.突变理论在顺层边坡稳定分析中的应用[J].同济大学学报,1993,(3):379-386.
[7]杨天鸿,芮勇勤,李连崇,等.顺层蠕动边坡变形破坏机理及其稳定性动态分析[J].工程地质学报,2003,11(2):155-161.
[8]金仁祥,杨良策,任光明,等.三峡库区某公路顺层岩质边坡变形特征分析[J].地质灾害与环境保护,2003,14(2):39-42.
[9]Cundall P A.Acomputer model for simulating progressivelarge scale movements in blocky systems[C]//Proceedings ofthe Symposiumof the International Society of Rock Mechan-ics,1971,1(Ⅱ):1-8.
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