Destructive field tests on mobilization of end resistance of cast-in-situ bored piles

被引：13

作者：

Liu Nian-wu ^{[1
,2
]}

Zhang Zhong-miao ^{[1
,2
]}

Zhang Qian-qing ^{[3
]}

Fang Kai ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Minist Educ, Key Lab Soft Soils & Geoenvironm Engn, Hangzhou 310058, Zhejiang, Peoples R China

[2] Zhejiang Univ, Inst Geotech Engn, Hangzhou 310058, Zhejiang, Peoples R China

[3] Shandong Univ, Geotech & Struct Engn Res Ctr, Jinan 250061, Peoples R China

来源：

JOURNAL OF CENTRAL SOUTH UNIVERSITY | 2013年 / 20卷 / 04期

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

static load test; settlement; post-grouting; end resistance; socketed depth; BEARING CAPACITY; LOAD;

D O I：

10.1007/s11771-013-1586-8

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A series of well-designed full-scale destructive load tests were conducted on six bored piles to investigate the influence of loose debris at the pile tip on end resistance. The results show that soft debris below the pile tip will weaken the mobilization of end resistance. The ultimate tip resistance of post-grouted pile is 2.05 times that of the pile without post-grouting and the ultimate tip resistance in the second load cycle is 2.31 times that of pile in the first load cycle. The relationship between unit end resistance and displacement follows a linear model and a bilinear mode in the first load cycle and the second load cycle, respectively, whereas the unit end resistance. displacement response of post-grouted bored pile can be simulated using a bilinear mode. The critical end resistance ranges between 2 000 kN and 3 000 kN and the critical displacement ranges between 2.5 mm and 4.5 mm in the bilinear mode. As for piles rested on moderately-weathered peliticsiltstone, the socketed length has no effect on the end resistance because of the existence of loose debris.

引用

页码：1071 / 1078

页数：8

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