检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
作 者:张常光[1,2] 隋建浩 范家燊 徐灏 ZHANG Changguang;SUI Jianhao;FAN Jiashen;XU Hao(School of Civil Engineering,Chang'an University,Xi'an 710061,China;Stake Key Laboratory of Geohazard Prevetion and Geoenvironment Protection,Chengdu University of Technology,Chengdu 610059,China)
机构地区:[1]长安大学建筑工程学院,陕西西安710061 [2]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610059
出 处:《岩土工程学报》2024年第8期1762-1767,1790,共7页Chinese Journal of Geotechnical Engineering
基 金:地质灾害防治与地质环境保护国家重点实验室开放基金项目(SKLGP2020K022);长安大学中央高校基本科研业务费专项资金项目(300102282206)。
摘 要:鉴于基坑周围土体常处于非饱和状态以及挡墙位移多发生绕墙底RB模式转动,首先采用非饱和土双应力状态变量理论推导墙底条形基础单侧滑动的承载力与RB位移模式下墙-土整体下滑时的竖向抗滑力,继而基于极限平衡法提出均布/线性吸力下非饱和土基坑抗隆起安全系数的求解过程,最后对比文献理论解答进行基坑工程实例应用与验证和挡墙位移模式探讨。研究表明:本文基坑抗隆起安全系数能反映土体非饱和特性与挡墙RB位移模式,可自然退化为饱和土结果,并得到文献地基承载力模式解答和极限上限法解答的合理性验证;挡墙RB位移模式下的竖向抗滑力小于静止状态下的,对应的基坑抗隆起安全系数亦然;非饱和土基坑若按忽略非饱和强度特性的饱和土基坑简化计算,得到的基坑抗隆起安全系数偏于保守。It is known that the soils surrounding a foundation pit are commonly in an unsaturated condition and the displacement of a retaining wall routinely rotates around wall bottom(i.e.,RB displacement mode).The bearing capacity of strip foundations at wall bottom with a single-sided sliding surface and the vertical anti-sliding force of wall-soil system under RB displacement mode with an overall down-sliding are first derived in the framework of the two-stress state variable theory for unsaturated soils.For uniform and linear suction profiles,the limit equilibrium method is then adopted to provide a solving process on the safety factor against basal heave of foundation pits in unsaturated soils,respectively.Finally,based on the verifications of the theoretical solutions reported in the literatures with an engineering case of foundation pits,the influences of different wall displacement modes are explored.The results show that the proposed safety factor against basal heave of foundation pits accounts for unsaturated characteristics of soils and RB displacement mode of a retaining wall.The proposed safety factor compares reasonably well with the available theoretical solutions of both the foundation bearing capacity model and the limit upper bound approach,and it can be naturally degraded to that of saturated soils.The vertical anti-sliding force and the safety factor against basal heave of foundation pits under RB displacement mode of retaining walls are smaller than those under an in-situ state.The safety factor against basal heave of foundation pits is conservative for simplified calculation of unsaturated soils taken as saturated soils ignoring unsaturated strength characteristics.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.222