一种非极限状态主、被动土压力计算方法  

A Method for Calculating Active and Passive Earth Pressures in Non-limit State

作　　者：曹海莹[1,2] 张书恒 费兴彪 刘德用 CAO Hai-ying;ZHANG Shu-heng;FEI Xing-biao;LIU De-yong(Key Lab of Green Construction and Intelligent Maintenance for Civil Engineering of Hebei Province,Yanshan University,Qinhuangdao Hebei 066004,China;School of Civil Engineering and Mechanics,Yanshan University,Qinhuangdao Hebei 066004 China)

机构地区：[1]燕山大学河北省土木工程绿色建造与智能运维重点实验室,河北秦皇岛066004 [2]燕山大学建筑工程与力学学院,河北秦皇岛066004

出　　处：《公路交通科技》2021年第5期31-40,64,共11页Journal of Highway and Transportation Research and Development

基　　金：河北省自然科学基金项目(E2020203168);河北省高等学校科学技术研究项目(ZD2020330);河北省研究生创新资助项目(CXZZSS2020042);秦皇岛市科学技术研究与发展计划项目(202005A005)。

摘　　要：为了完善非极限状态主、被动土压力计算方法中的不足,以刚性挡土墙为研究对象,采用加权组合的数学思想构建了一种非极限状态土压力计算模式。利用非极限状态土压力与静止土压力、松弛应力、挤压应力三者的关系方程,并引入松弛应力发挥系数和挤压应力发挥系数,分别推导得到非极限状态主、被动土压力的加权组合计算模型;借助非极限状态侧土压力系数与填土内摩擦角、墙土摩擦角的关系式,得到一种求解加权组合计算模型的计算方法;通过引入非极限状态墙土摩擦角与位移比的关系公式,在非极限状态土压力与挡土墙位移之间建立了对应关系。结果表明:本研究方法与经典理论计算结果基本吻合,验证了边界条件的合理性;当挡土墙位移处于非极限状态时,本研究方法较已有文献方法的计算结果更接近于试验数据;本研究方法考虑了非极限状态侧土压力系数与土体内摩擦角、墙土摩擦角的非线性关系,更适用于实际工况;在松弛应力发挥系数、挤压应力发挥系数作为加权组合计算模型中的权重,可以直观反映出应力变化对于非极限状态主、被动土压力的影响程度,为构建土压力计算模式提供了思路;由于墙土摩擦角实测数据偏少,其数值演变规律有待进一步探明,导致本研究方法的计算精度仍有一定提升空间。In order to overcome the shortcomings of the calculation method of active and passive earth pressures in non-limit state,taking rigid retaining wall as the research object,a calculation mode of earth pressure in non-limit state is constructed by using the mathematical idea of weighted combination.Based on the relationship equation of earth pressure in non-limit state with static earth pressure,relaxation stress and extrusion stress,and introducing relaxation stress exertion factor and extrusion stress exertion factor,the weighted combination calculation models of active and passive earth pressures in non-limit state are derived.With the help of the relation of lateral earth pressure coefficient with fill friction angle and wall-soil friction angle in non-limit state,a calculation method for solving the weighted combination calculation model is obtained.By introducing the formula of the relationship between wall-soil friction angle and displacement ratio in non-limit state,the corresponding relationship between earth pressure and displacement of retaining wall in non-limit state is established.The result shows that(1)the calculation results of the proposed method is in good agreement with that of classical theory,which verified the rationality of boundary conditions;(2)when the displacement of retaining wall is in non-limit state,the result of the proposed method is closer to the experimental data than those of existing literature methods;(3)the proposed method is more suitable for practical conditions,because the nonlinear relationship of lateral earth pressure coefficient with friction angles of soil and wall-soil in non-limit state are considered;(4)taking relaxation stress exertion coefficient and extrusion stress exertion coefficient as the weights in the weighted combination calculation model,can directly reflect the influence of stress change on the active and passive earth pressures in non-limit state,which provides a new way to construct the calculation mode of earth pressure;(5)due to the lack of measure

关 键 词：道路工程 非极限状态土压力 加权组合 应力发挥系数 墙土摩擦角 

分 类 号：U417.11[交通运输工程—道路与铁道工程]