非均质各向异性土体中桩加固边坡稳定性研究  

Slope stability reinforced with piles in non-uniform and anisotropic soils

作　　者：张平 韦家敬 李嘉 杨小礼[2] ZHANG Ping;WEI Jiajing;LI Jia;YANG Xiaoli(Shenzhen Tagen Pingshan Construction Engineering Co.,Ltd.,Shenzhen 518118,China;School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]深圳市天健坪山建筑工程有限公司,广东深圳518118 [2]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2023年第1期169-177,共9页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51378510)。

摘　　要：岩土工程中自然土质边坡稳定性问题是常见的基础性问题之一。自然界中的边坡常常处于一个维持自身稳定的状态,即内部的抵抗力不小于外部扰动力,而内部抵抗力和外部扰动力则随着边坡形状、施加在边坡的外力的改变而发生动态变化。如果在外力扰动较为强烈的情况下,边坡容易出现失稳,进而导致破坏。基于极限分析上限定理,通过建立对数螺线破坏机制,将边坡的局部土体视为滑动体,由对数螺旋坐标体系推导出内部抵抗力,即内部耗散率和外部扰动力,即外部工作率,从而对边坡进行三维分析。在抗滑桩加固作用下,基于非均质各向异性土体,推导出安全系数的功率计算表达式,基于强度折减理论获得最优的安全系数。研究结果表明:抗滑桩通过增强边坡的内部抵抗力,提高边坡安全系数。土体非均质各向异性表明边坡土体重要参数出现一定的增加或减少,这2个性质对边坡安全系数的影响不一致。边坡安全系数随非均质系数的增加而增加,随各向异性系数的增加而减少。通过与前人的研究成果对比,验证了本文计算方法与计算结果的正确性。将研究结果应用于实际边坡工程,研究了三维效应和桩加固作用对边坡安全系数的影响,获得了桩加固作用下边坡安全系数的分布规律,为类似的工程设计与施工提供参考。In geotechnical engineering, the natural soil slope stability problem is one of the common fundamental problems. In nature, the slope is often in a state of maintaining its own stability. That is, the internal resistance force is not less than the external disturbance force, while the internal resistance force and the external disturbance force change dynamically with the change of the shape of the slope and the external force applied to the slope. If the external disturbance is stronger, it is prone to instability and then leads to damage. Based on the upper-bound theorem, the slope was considered as a sliding body by establishing the logarithmic spiral failure mechanism, and the internal resistance force, i.e., internal dissipation rate, and the external disturbance force, i.e.,external work rate, were introduced from the logarithmic spiral coordinate system, so as to analyze the slope in three dimensions. Under the action of anti-slip pile reinforcement, the power calculation expression of factor of safety was derived. Based on the non-homogeneous anisotropic soil, the optimal factor of safety was obtained based on the theory of strength discounting. The anti-slip pile improves the slope factor of safety by improving the properties of the slope soil, thus enhancing the internal resistance of the slope. Soil non-homogeneous anisotropy indicates a certain increase or decrease of important parameters of the slope soil, and these two properties do not have the same effect on the slope safety coefficient. The slope factor of safety increases with the increase of non-homogeneous coefficient and decreases with the increase of anisotropy coefficient. By comparing with the previous research results, the calculation method and the calculation results of the article are verified to be correct. The research results are applied to the actual slope project, and the effects of three-dimensional effect and pile reinforcement on the slope safety coefficient are studied, and the distribution law of slope safety coefficient unde

关 键 词：非均质性 各向异性 桩 边坡稳定性 

分 类 号：TU452[建筑科学—岩土工程]