|Table of Contents|

Effect of Surrounding Load on Static Load Test of Super-long Pile in Soft Soil Foundation(PDF)

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

Issue:
2021年06期
Page:
1-10
Research Field:
软土地基加固与基础工程
Publishing date:

Info

Title:
Effect of Surrounding Load on Static Load Test of Super-long Pile in Soft Soil Foundation
Author(s):
CAO Wen-zhao1; 2;  YANG Zhi-yin1;  CAI Qiao-ling1;  GAO Lei2
(1. Central Research Institute of Building and Construction(Shenzhen)Co., Ltd., Shenzhen 518055, Guangdong, China; 2. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210024, Jiangsu, China)
Keywords:
soft soil foundation;  static load test;  numerical simulation;  surrounding load of pile;  loading method;  settlement
PACS:
TU473.1
DOI:
10.19815/j.jace.2021.08049
Abstract:
The effects of surrounding load and ground deformation on the test pile were analyzed for the static load test. The measured value and actual value of the test pile settlement were defined. Relevant rules in the national, professional and regional standards about the center distances between the test pile, anchor pile(or the buttress)and benchmark pile were discussed and the method to reduce the effect of surrounding load on the test pile settlement was investigated. Based on the actual case of static load test of large-diameter super-long pile located at the reclamation area in Shenzhen, a 3D numerical model was built to analyze the effect of surrounding load and loading method on the bearing performance of test pile and the test results, including pile-soil settlement, axial force of pile, displacement of monitoring point and secant stiffness of test pile, of which ground improvement and platform with hollow square were adopted. The results show that if the actual settlement of the test pile is used, the effect of loading/unloading process of surrounding load on limit bearing capacity and bearing performance can be ignored. For static load test of large-diameter super-long pile using platform with hollow square in the soft soil foundation, leveling instrument with high precision or total station are recommended to monitor and check the actual settlement of the pile top, including the settlement induced by the surrounding load of the pile during the test preparation stage, in order to get rid of the adverse effect of loading/unloading of surrounding load on the vertical displacement of reference point.

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Last Update: 2021-11-01