| 摘要: |
| 【目的】分析黄土地区复杂边坡局部及整体的稳定性，为该地区边坡的稳定加固及基础设施建设提供参考。【方法】引入单元安全度概念，基于摩尔库伦准则得到单元安全系数，结合有限差分法数值模型编制相应的外部计算模块，分析西气东输二期工程某黄土边坡的稳定性。【结果】计算得到了复杂边坡在动力荷载作用下的安全度分布，进而对边坡在动力荷载作用下的局部和整体稳定性的判断表明，在动力荷载作用下，边坡局部出现了先于整体的屈服，在坡体上沿和边坡坡体凸出部位出现了拉伸破坏。【结论】通过强度折减法得到边坡的整体安全系数，利用其对单元安全度方法合理性的验证表明，单元安全度方法在评价复杂边坡稳定性时优于其他方法。 |
| 关键词: 黄土边坡 地震作用 动力稳定性 单元安全度 |
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| 基金项目:国家自然科学基金项目（50779054，10872161） |
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| Dynamic stability analysis of loess slope based on the zone safety degree |
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| Abstract: |
| 【Objective】In order to make some references for improving slope and constructing infrastructures in the loess region,the local and overall stability of loess slope was analyzed.【Method】The zone safety degree concept was introduced,and then the zone safety degree was obtained based the Mohr Coulomb failure criterion.Finally,finite difference method and numerical model were used,and the corresponding external calculation module was prepared,loess slope stability was analyzed with this new method in West-East gas pipeline project.【Result】The zone safety degree distributions of general loess slope were obtained by calculating under the dynamic loads.The results showed that the local yield occured before the overall yield during dynamic loads acting,and that the tensile failure appeared along the protruding parts and the top of the loess slope.【Conclusion】The feasibility of the zone safety degree method was verified by the overall safety factor of loess slope throngh the strength reduction method,and the verified results showed that the zone safety degree method is superior to the other methods in evaluating slope stability. |
| Key words: loess slope earthquake actions dynamic stability zone safety degree |
