| 摘要: |
| 为了便于分析水位骤降对岸坡稳定性的影响,本文通过对考虑与不考虑渗透力作用时岸坡任一点的应力状态进行对比分析,得到可将渗透力对岸坡稳定性影响简化为抗剪强度参数粘聚力c降低的这一等效关系,并将此等效关系与强度折减法相结合,建立岸坡稳定性简化计算模型,提出了水位骤降影响下岸坡稳定性简化分析方法,并将该简化分析方法与已有分析方法进行对比分析。结果表明：采用本文所建立的简化分析方法、岸坡临界滑移场(GCSF)方法、Geostudio的Slope/W模块方法及传统极限平衡分析方法计算均质岸坡稳定性所得安全系数相差分别为2.6%、3.5%和3.5%,可见,本文所建立的简化分析方法与已有分析方法吻合较好；进一步采用本文建立的简化分析方法与临界滑移场(GCSF)方法计算存在软弱夹层的非均质岸坡,所得安全系数相差3.1%。表明采用本文所建立的简化分析方法计算水位骤降影响下均质、非均质岸坡稳定性均具有较好的可靠性和适用性。 |
| 关键词: 水位骤降 应力状态 等效关系 强度折减法 简化分析方法 |
| DOI： |
| 分类号:TU431 |
| 基金项目:重庆市博士后科研项目特别资助项目(No.Xm2017188)；自然资源部中国地质调查局公益性项目(No.DD20160291)；重庆交通大学国家内河航道整治工程技术研究中心暨水利水运工程教育部重点实验室开放基金(No.SLK2017A03)；重庆市基础与前沿研究科学基金(No.cstc2016jcyjA0123,cstc2018jcyjAX0559)。 |
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| Simplified analysis method for the bank slope stability with the influence of water level plummet |
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helinlin, zhouli, liangyue
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Chongqing Jiaotong University
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| Abstract: |
| In order to analyze the influence of water level plummet on the stability of bank slope, the stress state of one point in the bank slope with and without considering seepage force were analyzed, and a equivalent relationship that the influence of seepage force on bank slope stability could be seen as the decrease of the parameter of cohesion c was obtained. Combining the equivalent relationship with the strength reduction method, a simplified calculation model of bank slope stability was established, and then a simplified stability analysis method for bank slope stability under the influence of water level plummet was proposed. The homogeneous bank slope stability analyses were carried out by the simplified analysis method in this paper, bank slope critical slip field (GCSF) method , Geostudio"s Slope/W module method and the traditional ultimate equilibrium methods respectively, and the results showed that the safe factors calculated by the above-mentioned methods were in good agreement, with the differences of 2.6% , 3.5% and 3.5% respectively. Then the heterogeneous bank slope stability analyses were carried out by the simplified analysis method in this paper and lope critical slip field (GCSF) method respectively, the results showed that the safe factors calculated by the two methods were also in good agreement,with the difference of 3.1%. It indicates that the simplified calculation method proposed in this paper applied for homogeneous and heterogeneous bank slope stability analysis is reliability and feasible. |
| Key words: Water level plummet Stress state Equivalent relationship Strength reduction method Simplified calculation method |
