Effect of Stepped Reinforcement Size on Pile Displacement in the Passive Zone of Foundation Pit

doi:10.3969/j.issn.1001-5485.2013.07.017

Abstract

Abstract: To research the influence of stepped reinforcement size on pile displacement in the passive zone of deep foundation pit, we presented the concept of stepped reinforcement. On the basis of field test data of a foundation pit, we established a numerical model in which factors affecting the pile displacement such as the reinforcement shape and size are taken into consideration. Results showed that the simulation could well reflect the actual deformation of pile support system. The reinforcement in the passive zone has significant impact on the pile displacement. The optimum reinforcement effect can be obtained when the reinforcement width and depth at each step are approximately equal. Compared with other reinforcement approaches, the stepped reinforcement has obvious advantage, and is also highly feasible.

Key words: foundation pit, soft soil ground, stepped, passive zone, lateral deformation, numerical simulation

CLC Number:

O319.56

QU Ruo-feng, MA Yun,XU Guang-li, HU Xiao-qing. Effect of Stepped Reinforcement Size on Pile Displacement in the Passive Zone of Foundation Pit[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2013, 30(7): 86-90.

References

[1] SHIRLAW J N. Jet Grouting Soft Clays for Tunneling and Deep Excavations-Design and Construction Issues[C]∥ASCE. Proceedings of the Third International Conference on Grouting and Ground Treatment, New Orleans, Louisiana, February 10-12, 2003:257-268.
[2] LITTLEJOHN S. The Development of Practice in Permeation and Compensation Grouting: A Historical Review (1802-2002) [C]∥ASCE. Proceedings of the Third International Conference on Grouting and Ground Treatment, New Orleans, Louisiana, February 10-12, 2003: 100-116.
[3] 罗战友,刘薇,夏建中. 基坑内土体加固对围护结构变形的影响分析[J]. 岩土工程学报, 2006,(增1):1538-1540.(LUO Zhan-you, LIU Wei, XIA Jian-zhong. Effect of Improvement Soils on Lateral Deformation of Foundation Pits[J]. Chinese Journal of Geotechnical Engineering, 2006, (Sup.1): 1538-1540.(in Chinese)
[4] 寿旋,徐肖华,孙苗苗,等. 软土地区深基坑被动土体加固高度改进研究[J]. 岩土工程学报,2010,32(增):104-108.(SHOU Xuan, XU Xiao-hua, SUN Miao-miao, et al. Reinforcement Height of Passive Zone of Deep Foundation Pits in Soft Clay Regions[J]. Chinese Journal of Geotechnical Engineering,2010,32(Sup.):104-108.(in Chinese)
[5] 秦爱芳,胡中雄,彭世娟. 上海软土地区受卸荷影响的基坑工程被动区土体加固深度研究[J].岩土工程学报,2008,30(6):935-940.(QIN Ai-fang, HU Zhong-xiong, PENG Shi-juan. Depth of Soil Stabilization in Passive Area of Foundation Pits for Shanghai Soft Clay[J]. Chinese Journal of Geotechnical Engineering, 2008,30(6): 935-940.(in Chinese)
[6] 贾坚. 土体加固技术在基坑开挖工程中的应用[J]. 地下空间与工程学报,2007,3(1):132-137.(JIA Jian. The Application of Ground Treatment in Foundation Excavations[J]. Chinese Journal of Underground Space and Engineering. 2007, 3(1): 132-137.(in Chinese)
[7] DB42/159—2004, 湖北省基坑工程技术规程[S]. 武汉:湖北省建设厅, 2004.(DB42/159—2004, Technical Specification for Engineering of Foundation Excavation in Hubei Province[S]. Wuhan: Department of Housing and Urban Rural Development of Hubei Province, 2004.(in Chinese)
[8] 张辉,熊巨华,曾英俊. 长条形基坑地下连续墙侧向位移数值模拟及其影响因素分析[J]. 结构工程师,2010,26 (1):80-86.(ZHANG Hui, XIONG Ju-hua, ZENG Ying-jun. Numerical Simulation and Influence Factor Analysis on Lateral Displacement of Diaphragm Wall in Long-Narrow Pit[J]. Structural Engineers, 2010, 26 (1):80-86.(in Chinese)
[9] 郑俊杰,章荣军,丁烈云, 等. 基坑被动区加固的位移控制效果及参数分析[J]. 岩石力学与工程学报,2010,29(5):1042-1051.(ZHENG Jun-jie, ZHANG Rong-jun, DING Lie-yun, et al. Displacement Control Effects and Parameter Analysis of Passive Zone Improvement of Foundation Pits[J]. Chinese Journal of Rock Mechanics and Engineering, 2010, 29(5): 1042-1051.(in Chinese)

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