基于能量理论的土钉支护结构地震主动土压力计算方法研究

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摘要地震作用下柔性支挡结构土压力的计算是个比较复杂的问题，其方法还不成熟且比较保守，为了能够比较准确合理地计算地震作用下土钉支护结构的主动土压力，以能量法和极限平衡法为基础，考虑土钉支护结构对地震土压力的影响，建立了滑动面为平面的地震主动土压力模型，推导了地震主动土压力的计算公式。结合工程实例，把公式与现有规范和方法的计算结果作比较，并进行参数分析，得到一些具有参考价值的结果。分析表明，公式计算的土压力值均比其它方法小，土钉的存在能够有效地减小地震作用下土体对支护结构的侧向压力，并使滑移面慢慢向墙后移动。通过算例验证，说明这种考虑土钉支护作用的计算方法更加合理，比较符合工程实际，为以后土钉支护结构的施工、优化和抗震设计提供参考。

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	王永胜
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关键词 ：边坡工程, 能量理论, 极限平衡法, 土钉支护结构, 地震主动土压力

Abstract：The calculation of earth pressure of flexible retaining wall under earthquake ground motion is a complex problem, and the relevant method for calculating the earth pressure is still not mature and conservative. In order to calculate the active earth pressure of soil-nailing retaining structure under earthquake ground motion accurately and reasonably based on the energy method and the limit equilibrium method, a model for the seismic active earth pressure is established, in which the sliding surface is considered as a plane, and the formula is obtained considering the influence of the role of soil-nailing retaining structure on the earth pressure. Based on an engineering example, the results obtained from the above formula are compared with those obtained from the existing norms and methods, and parametric analysis is carried out, and then some practical results are obtained. The results show that the calculated earth pressures are smaller than those from other methods. The existence of soil nails can effectively reduce the lateral pressure of supporting structures under earthquake ground motions and make the sliding surface slowly move to the wall back. The proposed method considering the role of soil nailing is more reasonable and agrees with the actual engineering. It may provide some valuable references for the construction, optimization and anti-seismic design of soil-nailing retaining structures.

Key words： slope engineering energy theory limit equilibrium method soil-nailing retaining structure seismic active earth pressure

收稿日期: 2012-11-13 出版日期: 2012-11-13

TU432

作者简介: 王永胜(1985– )，男，甘肃甘谷人，博士生，主要从事支挡结构和工程事故分析与处理方面的科研工作。

引用本文:

王永胜, 朱彦鹏, 周勇. 基于能量理论的土钉支护结构地震主动土压力计算方法研究[J]. 岩土工程学报, 2012, 34(suppl): 40-44. WANG Yong-sheng, ZHU Yan-peng, ZHOU Yong. Method for calculating seismic active earth pressure of soil-nailing retaining structures based on energy theory. Chinese J. Geot. Eng., 2012, 34(suppl): 40-44.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2012/V34/Isuppl/40

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