软土区低施工净空条件下明挖隧道设计探讨  被引量:1

Discussion on Design of Excavated Tunnels under Low Construction Clearance in Soft Soil Area

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作  者:王佳辰 WANG Jiachen

机构地区:[1]中交第一公路勘察设计研究院有限公司,陕西西安710075

出  处:《城市道桥与防洪》2022年第4期138-140,M0013,共4页Urban Roads Bridges & Flood Control

摘  要:中山市古镇快线(沙古公路)快速化改造工程在裕祥路节点设置一座明挖下沉隧道,隧址位于深厚软土区,隧道平面投影上方有500 k V高压线走廊小角度斜交隧道路线轴线,竖向施工空间受限。以该项目为例,针对常见的软土地层基坑墙底隆起验算难以通过的问题进行研究,并借鉴他人研究成果,给出一种解决方案。同时以该项目为例,提出可采用接杆搅拌桩实现净空受限条件下隧道基坑坑底加固。该工艺既能满足搅拌桩深层加固需求,其价格也比常规低净空下普遍采用的高压旋喷桩加固工艺低廉。目前,基于上述解决方案的施工图设计文件已取得批复,将为软土地区低施工净空条件下明挖隧道设计提供有益参考。Zhongshan Guzhen Express Line(Shagu Highway)Rapid Reconstruction Project is an excavated submerged tunnel set up at the node of Yuxiang Road.The tunnel position is located in a deep soft soil area.There is a small-angle oblique tunnel line axis of the 500 k V high-voltage corridor above the plane projection of the tunnel.The vertical construction space is limited.Taking this project as an example,the common problem of foundation pit wall bottom uplift in soft soil layers hard to pass the checking calculation is studied.And with the other study results for reference,a solution is given.At the same time,taking this project as an example,it is proposed to use the connecting rod mixing pile for realizing the reinforcement of foundation pit bottom of the tunnel under the condition of limited clearance.This technology can meet the deep reinforcement needs of mixing piles,and its price is also lower than the conventional high-pressure jet grouting pile reinforcement technology commonly used under the low clearance.At present,the construction drawing design documents based on the above solutions have been approved,which will provide a useful reference for the design of excavated tunnels in soft soil areas with low construction clearance conditions.

关 键 词:抗隆起稳定性 接杆搅拌桩 明挖隧道 岩土工程 

分 类 号:U452.2[建筑科学—桥梁与隧道工程]

 

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