|
|
|
| OPTIMIZATION ANALYSIS OF EFFICIENCY OF ISOLATION PILES IN CONTROLLING THE DEFORMATION OF EXISTING TUNNELS ADJACENT TO DEEP EXCAVATION |
| ZHENG Gang1，2，DU Yiming1，2，DIAO Yu1，2 |
(1. Key Laboratory of Coast Civil Structure Safety of Ministry of Education，Tianjin University，Tianjin 300072，China；
2. School of Civil Engineering，Tianjin University，Tianjin 300072，China) |
|
|
|
|
Abstract The mechanism of effects for isolation piles on reducing displacements of soil and tunnel below the ground surface needed to be studied. Field measurements were carried out in a deep excavation project in Tianjin，which adopted the isolation piles to protect the adjacent existing tunnel. The deformations of the diaphragm wall，soil outside the excavation，isolation piles and the tunnel were obtained and analyzed. Based on the measured data，a parametric study of isolation piles using finite element method considering the small strain of soil was conducted to investigate the horizontal displacements of the tunnel and the soil below the ground surface adjacent to a deep excavation. It was shown that isolation piles had both effects of isolation and drag on the tunnel adjacent to the deep excavation. The deformation of adjacent tunnel from deep excavation can be increased when the drag effect was more remarkable. The buried isolation pile could be used to minimize the effect of drag and the horizontal displacement of tunnel. Moreover，the isolation piles had higher efficiency in reducing the tunnel displacement when the piles were located closer to the tunnel.
|
|
|
|
|
|
| [1] CHANGC T，SUN C W，DUANNSW，et al. Response of a Taipei rapid transit system(TRTS) tunnel to adjacent excavation[J]. Tunnelling and Underground Space Technology，2001，16(3)：151–158.
[2] 李大勇，龚晓南，张土乔. 软土地基深基坑周围地下管线保护措施的数值模拟[J]. 岩土工程学报，2001，23(6)：736–740.(LI Dayong，GONG Xiaonan，ZHANG Tuqiao. Numerical simulation of the buried pipelines protection adjacent to deep excavation[J]. Chinese Journal of Geotechnical Engineering，2001，23(6)：736–740.(in Chinese))
[3] 欧章煜，谢百钩. 深开挖邻产保护之探讨[J]. 岩土工程学报，2008，30(增)：509–517.(OU Zhangyu，XIE Baigou. Building protection measures in deep excavations[J]. Chinese Journal of Geotechnical Engineering，2008，30(Supp.)：509–517.(in Chinese))
[4] 雷永生. 西安地铁二号线下穿城墙及钟楼保护措施研究[J]. 岩土力学，2010，31(1)：223–236.(LEI Yongsheng. Research on protective measure of city wall and bell tower due to underneath crossing Xi'an metro line No.2[J]. Rock and Soil Mechanics，2010，31(1)：223–236. (in Chinese))
[5] 罗成恒，魏建华. 减少软土深基坑周边环境初始位移的方法探讨[J]. 岩土工程学报，2012，34(增)：49–53.(LUO Chengheng，WEI Jianhua. Method for decreasing initial displacement of surrounding environment of deep excavations in soft soils[J]. Chinese Journal of Geotechnical Engineering，2012，34(Supp.)：49–53.(in Chinese))
[6] 刘毓氚，陈福全，左广洲. 大面积堆载下软土地基的应力隔离与加固实例分析[J]. 岩土力学，2006，27(5)：846–848.(LIU Yuchuan，CHEN Fuquan，ZUO Guangzhou. Case study of synthetic method of stress isolation and ground reinforcement to handle soft ground problem induced by adjacent surcharge load[J]. Rock and Soil Mechanics，2006，27(5)：846–848.(in Chinese))
[7] 费 纬. 隔离桩在紧邻浅基础建筑的深基坑工程变形控制中的应用[J]. 岩土工程学报，2010，32(增1)：265–270.(FEI Wei. Application of isolation piles to deformation control of deep foundation pits close to buildings with shallow foundation[J]. Chinese Journal of Geotechnical Engineering，2010，32(Supp.1)：265–270.(in Chinese))
[8] 翟杰群，贾 坚，谢小林. 隔离桩在深基坑开挖保护相邻建筑物中的应用[J]. 地下空间与工程学报，2010，6(1)：162–166.(ZHAI Jiequn，JIA Jian，XIE Xiaolin. Practice of partition wall in the building protection projects deep excavation[J]. Chinese Journal of Underground Space and Engineering，2010，6(1)：162–166.(in Chinese))
[9] 郑 刚，颜志雄，雷华阳，等. 基坑开挖对临近桩基础影响的实测及有限元数值模拟分析[J]. 岩土工程学报，2007，29(5)：638–643. (ZHENG Gang，YAN Zhixiong，LEI Huayang，et al. Field observation and finite element numerical simulation analysis of effect on adjacent piles due to excavation[J]. Chinese Journal of Geotechnical Engineering，2007，29(5)：638–643.(in Chinese))
[10] BILOTTA E，BITETTI B，MCNAMARA A M，et al. Micropiles to reduce ground movements induced by tunnelling[C]// Proceedings of Physical Modeling in Geotechnics. London：[s. n.]，2006：1 139–1 144.
[11] BILOTTA E. Use of diaphragm walls to mitigate ground movements induced by tunnelling[J]. Géotechnique，2008，58(2)：143–155.
[12] 邹文浩，徐 明. 考虑土体小应变刚度特征时隔断结果保护效果的三维数值分析[J]. 岩土工程学报，2013，35(增1)：203–209. (ZOUWenhao，XU Ming. 3D numerical analysis of mitigation effect of isolation pile and diaphragm wall considering small strain stiffness of soils[J]. Chinese Journal of Geotechnical Engineering，2013，35(Supp.1)：203–209.(in Chinese))
[13] 应宏伟，李 涛，杨永文，等. 深基坑隔断墙保护邻近建筑物的效果与工程应用分析[J]. 岩土工程学报，2011，33(7)：1 123–1 128. (YING Hongwei，LI Tao，YANG Yongwen，et al. Effect and application walls in protecting adjacent buildings from deep foundation pits[J]. Chinese Journal of Geotechnical Engineering，2011，33(7)：1 123–1 128.(in Chinese))
[14] SIMPSON B. Retaining structure-displacement and design(32nd Rankine lecture)[J]. Géotechnique，1992，42(4)：541–576.
[15] LEE K M，HOU X Y，GE X W，et al. An analytical solution for a jointed shield-driven tunnel lining[J]. International Journal for Numerical and Analytical Methodsin Geomechanics，2001，25(4)：365–390.
[16] LEE K M，GE X W. The equivalence of a jointed shield-driven tunnel lining to a continuous ring structure[J]. Canadian Geotechnical Journal，2001，38(3)：461–483.
[17] CLOUGH G W，ROURKETD O. Construction induced movements of insitu walls[C]// Proceedings of the ASCE Conference on Design and Performance of Earth Retaining Structures. New York：Geotechnical Special Publisher，1990：439–470. |
|
|
|
2015, Vol. 34 
