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局部超挖对悬臂排桩基坑支护体系安全性能的影响
引用本文:雷亚伟,郑刚,程雪松,黄天明,李溪源. 局部超挖对悬臂排桩基坑支护体系安全性能的影响[J]. 长江科学院院报, 2020, 37(9): 70-78. DOI: 10.11988/ckyyb.20190563
作者姓名:雷亚伟  郑刚  程雪松  黄天明  李溪源
作者单位:1.天津大学 土木工程系,天津 300072;2.中国建筑第二工程局有限公司,北京 100160;3.天津大学滨海土木工程结构与安全教育部重点实验室,天津 300072;4.浙江浙峰工程咨询有限公司,杭州 310000
基金项目:国家重点研发计划项目(2016YFC0802008);天津市自然科学基金项目(18JCQNJC07900)
摘    要:由局部超挖引发基坑大范围破坏的工程事故时有发生,但局部超挖对基坑整体安全性能的影响及其引发连续破坏的机理尚仍缺乏研究。以悬臂排桩支护的长条形基坑为例,采用模型试验和有限差分法对基坑局部超挖引起的荷载传递规律进行探索。结果表明:随着超挖深度的增大,由于土拱效应,超挖区外支护桩内力大幅增长,而超挖区内支护桩桩身弯矩先增加后降低或持续降低;大面积开挖深度相同时,随着局部超挖范围增大,邻近支护桩桩身弯矩与位移增幅逐渐增大并趋于稳定。研究成果初步揭示了局部超挖对支护桩内力的影响等荷载传递规律,可为防超挖引发基坑连续破坏研究和局部深坑设计提供参考。

关 键 词:基坑事故  悬臂排桩  局部超挖  有限差分法  桩身弯矩  
收稿时间:2019-05-15
修稿时间:2019-07-25

Influence of Partial Over-excavation on Safety Performance of Excavation Retained by Cantilever Contiguous Retaining Piles
LEI Ya-wei,ZHENG Gang,CHENG Xue-song,HUANG Tian-ming,LI Xi-yuan. Influence of Partial Over-excavation on Safety Performance of Excavation Retained by Cantilever Contiguous Retaining Piles[J]. Journal of Yangtze River Scientific Research Institute, 2020, 37(9): 70-78. DOI: 10.11988/ckyyb.20190563
Authors:LEI Ya-wei  ZHENG Gang  CHENG Xue-song  HUANG Tian-ming  LI Xi-yuan
Affiliation:1. Department of Civil Engineering, Tianjin University, Tianjin 300072, China; 2. China Construction Second Engineering Bureau Ltd., Beijing 100160, China; 3. Ministry of Education Key Laboratory of Coast Civil Structure Safety, Tianjin University, Tianjin 300072, China; 4. Zhejiang Zhefeng Engineering Consulting Co. Ltd., Hangzhou 310000, China
Abstract:Although collapse cases caused by partial over-excavation are seen frequently, studies on the overall safety performance and the progressive collapse mechanism caused by partial over-excavation are still in lack. In this study, the load transfer mechanism of cantilever contiguous retaining piles of long strip excavation subjected to partial over-excavation were investigated by finite difference method and model test. Results revealed that with the increase of over-excavation depth, the internal force of the piles beyond over-excavation zone increased by a large margin due to soil arch effect, while the bending moment of piles within over-excavation zone increased first and then decreased or continued to decrease. When the excavation depth in a large area remained the same, the increments in bending moment and displacement of adjacent piles intensified gradually and tended to be stable along with the widening of partial over-excavation range. The research results reveal the load transfer rules reflecting the influence of partial over-excavation on internal force of piles.
Keywords:excavation collapse  cantilever contiguous piles  partial over-excavation  finite difference method  bending moment of piles  
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