|Table of Contents|

Research on application of micro-steel pipe pile underpinning piled raft foundation of existing building(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2023年04期
Page:
171-178
Research Field:
岩土工程
Publishing date:

Info

Title:
Research on application of micro-steel pipe pile underpinning piled raft foundation of existing building
Author(s):
ZHU Yanpeng1; 2;  LYU Xiangxiang1; 2;  YANG Kuibin1; 2;  WU Linping1; 2;  WEI Zhengde1; 2;  SHI Duobang1; 2
(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, Gansu, China)
Keywords:
existing building;  underpinning technology;  micro-steel pipe pile;  construction monitoring;  reinforcement effect
PACS:
TU929
DOI:
10.19815/j.jace.2021.11114
Abstract:
In order to study the practical application of micro-steel pipe pile underpinning piled raft foundation of existing building, a foundation underpinning project of an existing piled raft foundation building in Sanmenxia city was taken as an example. The cause of the accident of the existing 16-story building that has been inclined was analyzed. Combined with the previous actual engineering case experience and the comparison of the advantages and disadvantages of each reinforcement method, and finally a reinforcement plan combining the underpinning of micro-steel pipe pile underpinning and the externally expanded raft foundation was adopted. Through the calculation of vertical bearing capacity of single pile, stability calculation and field test pile, the construction technology and control parameters of micro-steel pipe pile were determined, and the field settlement monitoring was used to evaluate the effect of the underpinning reinforcement scheme. The results show that the reinforcement scheme combining micro-steel pipe pile underpinning and externally expanded raft foundation not only has short construction period and clear reinforcement mechanism, but also has less disturbance to buildings during construction, and the comprehensive reinforcement effect is remarkable. According to the monitoring data, the cumulative settlement at the measuring points DX1, DX2 and DX7 are relatively large. The maximum cumulative settlement at the measuring point DX1 is -81.1 mm, and the maximum daily settlement at the measuring point DX7 is -1.23 mm. About 15 d after the construction of the micro-steel pipe piles, the average daily settlement of the reinforced existing building is stably controlled between 0 and 0.05 mm?d-1. The research findings can provide some reference for the reinforcement design of uneven settlement of foundation in filling area.

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Last Update: 2023-07-01