局部无嵌固深度的深基坑支护方案可行性分析

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英文篇名：Feasibility Analysis on Renovation Scheme of Retaining and Protecting for Foundation Excavation which Local Unembedded Depth 作者：刘建辉 ; 郭乾坤 英文作者：Liu Jianhui;Guo Qiankun;Guangzhou Municipal Engineering Design & Research Institute; 关键词：隧道上开挖 ; 局部无嵌固深度 ; 桩墙 ; 基坑支护 ; 有限元计算 英文关键词：excavation on tunnel;;local unembedded depth in the side of foundation pit;;pile-wall;;retaining and protecting for foundation excavation;;finite element calculation 中文刊名：GDTM 英文刊名：Guangdong Architecture Civil Engineering 机构：广州市市政工程设计研究总院; 出版日期：2018-01-15 出版单位：广东土木与建筑 年：2018 期：v.25;No.299 语种：中文; 页：GDTM201801002 页数：4 CN：01 ISSN：44-1386/TU 分类号：8-11

摘要

隧道横穿深基坑,先于基坑施工,隧道初衬顶与结构底板底紧贴,导致基坑侧壁宽9.9m范围无嵌固,为解决这一难点,在桩墙+内支撑的原支护结构方案上提出,基坑侧壁局部外放并将嵌固端转移至隧道两侧,且增加无嵌固深度基坑侧壁横向受力钢筋的支护结构方案;该方案有能利用基坑内外扩后的空间进行放坡开挖,并且可利用坡体段进行基坑侧壁脚部加固、止水,同时不需要更换施工基坑侧壁的机械设备的优点,满足施工要求,此外,通过midas-Gen有限元软件和理正深基坑进行对比计算,结果表明此支护方案满足现行规范要求,综上所述方案可行。
        Due to the tunnel constructed before the deep foundation pit excavated,the tunnel passes through the foundation pit,and the initial lining of the tunnel is close to the bottom of the structural floor,result that there will be wide 9.9 m range local unembedded depth in the side of foundation pit. To solve this difficulty,we put forward the feasibility scheme base on the original support structure of pile-wall+inner support,that the side of foundation pit is partly released and the embedded end is transferred to both sides of the tunnel,as well as increasing the transverse force steel bar in the side of foundation pit wirhout embedded depth. This scheme has the following advantages:using the space inside the foundation to excavate with slop,reinforcing and sealing the side wall of the foundation pit with the slope section,even there is no need to change the mechanical equipment for constructing the side of foundation pit. In addition,by the comparison of the calculated by the finite element software midas-Gen and Lizheng,the results show that the support scheme meets the requirements of the current codes. In conclusion,the scheme is feasible.

引文

[1]郑刚,杜一鸣,等基坑开挖引起邻近既有隧道变形的影响区研究[J].岩土工程学报,2016,38(4):600-609.
    [2]闫静雅.邻近运营地铁隧道的深基坑设计施工浅谈[J].岩土工程学报,2010,32(S1):235-237.
    [3]王修春.吊脚连续墙在深基坑中的应用[J].广东土木与建筑,2013(5):23-25.
    [4]康涛.钻孔咬合桩新工艺应用中遇到的问题分析[J].土工基础,2005,19(4):6-7.
    [5]喻卫华.地下连续墙支护在紧邻珠江深基坑工程中的应用[J].广东土木与建筑,2017(1):25-28.
    [6]张前,杨霜,等.咬合桩等效刚度法在基坑工程中应用[J].低温建筑技术,2015(8):140-141.
    [7]王安龙.钻孔咬合桩——地铁工程围护结构新型式[J].铁道工程学报,2003(1):53-59.
    [8]严生灿.冲孔灌注咬合支护桩渗漏分析与堵漏[J].江西建材,2017(12):59-60.
    [9]吴铭炳.咬合桩在基坑支护中的应用与改进[J].福建建筑,2013(11):14-16.