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软土地区深大基坑双环形支撑体系受力变形特性分析
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Aanlysis on Bearing and Deforming Behavior of a Large-Scale Double Annular Arched Girders Structural System in Deep Excavation
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    摘要:

    圆环型支撑结构受力以压为主,有利于发挥混凝土材料的抗压强度,受力合理,施工作业方便.其中单圆环支撑适用于长宽比接近于1的规则基坑,对于长宽比较大的不规则基坑,在工程中出现了双环甚至多环的支撑形式.上海软土地区某“L”形分布的不规则基坑,基坑面积接近50 000 m2,最大开挖深度13.15 m.设计时将基坑分为A、B、C三个区域,A区采用双环形支撑,C区采用对撑,B区是A区和C区的过渡区,采用边桁架支撑,自上而下顺作施工.基于现场监测资料,本文分析了基坑工程开挖过程中的侧墙沉降及位移,基坑周边土体位移,地表沉降等实测数据,总结了基坑开挖过程中双环形支撑体系的受力变形特性,为双环形支撑体系在深基坑工程的应用提供参考依据.

    Abstract:

    Annular arched girders structural support system bears pressure mainly, which is conducive to play compressive strength of concrete materials reasonably and convenient to conduct construction. The single annular arched girders structural support system is suitable for regular pit whose aspect ratio is close to 1. For the irregular pit with large aspect ratio, double annular and even multi-annular support has been applied in some projects. An irregular “L” shaped foundation pit in Shanghai soft soil area with area of nearly 50 000 m2 and a maximum excavation depth of 13.15 m applied double annular support system. The foundation pit used top-down method and is designed into A, B, C three zones,where zone A applied double annular support system,zone C is supported by side girders and angle diagonal brace,and zone B uses angle brace to support, working as a transition zone. Based on in-site monitoring data, this paper investigated the movement of lateral wall, subsurface horizontal movements and surface subsidence. Based on these data, this paper summarizes the deformation and force bearing characteristics of double annular support system, which can provide valuable reference for applications of it in deep foundation pit engineering.

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梁发云?覮,赵鸣一,陈尚荣.软土地区深大基坑双环形支撑体系受力变形特性分析[J].湖南大学学报:自然科学版,2018,45(S0):173~177

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  • 在线发布日期: 2018-12-29
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