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Test Research on Soil Compaction Effect and Ultimate Bearing Capacity of Bidirectional Soil Displacement Screw Piles in Collapsible Loess Site(PDF)

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

Issue:
2022年05期
Page:
241-250
Research Field:
基础工程
Publishing date:

Info

Title:
Test Research on Soil Compaction Effect and Ultimate Bearing Capacity of Bidirectional Soil Displacement Screw Piles in Collapsible Loess Site
Author(s):
MA Tian-zhong1;  SUN Chen-dong1;  GAO Yu-guang2;  WANG Zheng-zhen1;  SU Tian-tao1;  GAO Hong1
(1. School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, Gansu, China; 2. Gansu Civil Engineering Research Institute Co., Ltd., Lanzhou 730050, Gansu, China)
Keywords:
bidirectional soil displacement screw pile;  collapsible loess;  compaction effect;  ultimate bearing capacity;  in-situ test
PACS:
TU473
DOI:
10.19815/j.jace.2022.06016
Abstract:
In order to deeply study the compaction range and compaction effect of the soil displacement screw pile on the collapsible loess around the pile before and after the hole forming in the large thickness self weight collapsible loess area, and to reveal the failure characteristics and the ultimate bearing capacity of the bidirectional soil displacement screw pile, the on-site bidirectional spiral soil compaction hole forming test and static load test were carried out in a high-order leveling site in Yuzhong of Lanzhou. Based on the correction coefficient of the ultimate resistance of the pile side of the bidirectional soil displacement screw pile in the local codes and standards, and the field measured data of typical strata in Lanzhou, the standard value of pile end ultimate resistance of different soil types in Gansu province was proposed. The results show that the surface heave and radial lateral displacement of the soil around the pile decrease with the distance from the hole forming center. The radial influence range is 3D(D is pile diameter)pile center distance, and the vertical influence range is 25 m below the surface. The physical and mechanical indexes of the soil around the pile are significantly improved in the range of 2D pile center distance. The smaller the pile center distance is, the more obvious influence of soil compaction on the physical properties of the soil around the pile is. Under the same working conditions, the ultimate bearing capacity of single pile of bidirectional soil displacement screw pile is 25% higher than that of long spiral cast-in-place pile, and they all represent the characteristics of slow-moving strength failure.

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Last Update: 2022-09-30