隧道原位扩建对邻近建筑物影响评估的研究

›› 2012, Vol. 33 ›› Issue (S2): 251-256.

隧道原位扩建对邻近建筑物影响评估的研究

朱根桥^{1, 2}，林志²，朱育才³，杨成³

1. 重庆大学土木工程学院，重庆 400030；2. 招商局重庆交通科研设计院有限公司隧道工程所，重庆 400067； 3. 重庆交通大学土木建筑学院，重庆 400074

收稿日期:2012-02-10 出版日期:2012-11-22 发布日期:2012-12-11
作者简介:朱根桥，男，1974年生，硕士，高级工程师，长期从事岩土与地下工程科研与设计工作

Research on influences of in-situ tunnel extension project on adjacent buildings

ZHU Gen-qiao^{1, 2}, LIN Zhi², ZHU Yu-cai³, YANG Cheng³

1. School of Civil Engineering, Chongqing University, Chongqing 400030, China; 2．Tunnel Engineering Department, China Merchants Chongqing Communications Research & Design Institute Co., Ltd., Chongqing 400067, China; 3. School of Civil Engineering Architecture and Construction, Chongqing Jiaotong University, Chongqing 400074, China

Received:2012-02-10 Online:2012-11-22 Published:2012-12-11

摘要/Abstract

摘要： 以重庆机场路渝洲隧道原位车道扩建为8车道工程为背景，通过文献调研、数值分析、监控量测和爆破监测等手段，对隧道原位扩建形式比选、扩建开挖对邻近建筑物变形影响和扩建爆破作业对邻近建构筑物影响等开展研究, 得到如下结论：（1）隧道原位扩建有单侧扩建、两侧扩建和周围扩建3 种形式，从施工力学分析，单侧扩建形式最优；（2）渝州隧道地表最大沉降曲线与小净距隧道类似；（3）地表沉降槽曲线的影响半径为40 m左右；（4）渝州隧道最大地表沉降差距离中线约10 m和30 m，实测临近建筑物沉降满足规范，建筑物安全；（5）爆破振动监测显示临近隧道和建筑物的振速值均远低于规范限制值，说明既有隧道形成的临空面对于吸收和释放爆破振动能量的作用很大。该研究成果为今后类似隧道原位扩建工程的施工方案提供参考借鉴。

关键词: 隧道, 原位扩建, 沉降, 数值分析, 监控量测, 爆破监测

Abstract: The 2×2 lane Yuzhou Tunnel was extended to 4×4 lane tunnel in Chongqing airport road. Taking this project as an engineering background, the influences of in situ extension of the tunnel excavation on adjacent buildings and blasting effect on adjacent buildings are studied. The main study methods include the literature research, numerical analysis, monitoring measurement and blasting monitoring. The main conclusions are drawn as follows. (1) Unilateral expansion, both sides extension and around extension are the three tunnel extension method in situ, by construction mechanics analysis, the unilateral extension is optimal; (2) maximum surface settlement curves of extension tunnel are similar with neighborhood tunnel; (3) radius of surface settlement trough curve is about 40 m; (4) the max surface settlement differential is about 10 m and 30 m distance from the center line. The building settlement meets the specifications, and the buildings are safe; (5) blasting vibration monitoring data indicate that the vibration speed of the near building and tunnel is below the specification limit, which indicates that the free face of the existing tunnel absorbs and releases most of blasting vibration energy. The research results provide a reference for similar tunnels in situ extension project.

Key words: tunnel, expansion in situ, settlement, numerical analysis, monitoring measurement, blasting monitoring

中图分类号:

U 45

朱根桥，林志，朱育才，杨成 . 隧道原位扩建对邻近建筑物影响评估的研究[J]. , 2012, 33(S2): 251-256.

ZHU Gen-qiao , LIN Zhi , ZHU Yu-cai , YANG Cheng . Research on influences of in-situ tunnel extension project on adjacent buildings[J]. , 2012, 33(S2): 251-256.

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