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机构地区:[1]同济大学道路与交通工程教育部重点实验室,上海201804
出 处:《华东交通大学学报》2015年第3期1-5,共5页Journal of East China Jiaotong University
摘 要:依托宁波地区某主干道周边基坑地下连续墙施工工点,通过现场取样测试土体动三轴下强度指标;采用三维有限元数值模拟判别交通和施工超载作用下槽壁整体失稳模式;并以槽壁外侧土体达到剪切塑性极限为临界条件,采用极限平衡法,推导单一土层内一字型地下连续墙槽壁整体失稳的判定公式。研究结果表明:地下连续墙槽壁呈现类似四棱锥形整体失稳形态;护壁泥浆出现补充不及时或漏浆时,槽壁将发生整体失稳破坏。Based on an underground continuous wall construction worksite near the main road in Ningbo city, this study tested the soil dynamic strength index through field sampling and analyzed the integral buckling mode of trench wall under overload transportation and construction by 3D finite element numerical simulation. Assuming it would reach critical conditions when the tank wall of the lateral soil achieved the shear plastic limit, the study used the limit equilibrium method and deduced the overall decision formula of instability of the slurry trench of under- ground continuous wall on a single soil layer. The findings indicate that overall instability presents class-four sprayed failure pattern and overall instability would appear when the supporting slurry lagged behind or had leakage.
关 键 词:软土基坑 地下连续墙 交通和施工超载 极限平衡 整体失稳
分 类 号:U417.1[交通运输工程—道路与铁道工程] TU745.3[建筑科学—建筑技术科学]
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