Uplift behaviour of cylindrical anchors in sand

1998 ◽  
Vol 35 (1) ◽  
pp. 70-80 ◽  
Author(s):  
S T Hsu ◽  
H J Liao
Keyword(s):  
Numerical Analysis ◽  
Model Test ◽  
Substantial Contribution ◽  
Laboratory Model ◽  
Cylindrical Shape ◽  
Critical Depth ◽  
Pullout Capacity ◽  
Pullout Behaviour ◽  
Laboratory Model Test ◽  
Shaft Friction

A series of laboratory model tests and numerical analyses has been carried out to study the behaviour of vertically embedded cylindrical anchors in sand. Due to the cylindrical shape of the anchor, both the shaft friction and the end resistance have substantial contribution to the pullout capacity. But shaft friction and end resistance do not reach peak values at the same anchor displacement. As a result, analyzing the anchorage behaviour of cylindrical anchors is complicated. The pullout behaviour of the anchor is significantly influenced by the embedded depth. There exists a critical depth (about seven to eight times the anchor diameter D) which differentiates the behaviour of a deeply embedded cylindrical anchor from that of an anchor with shallow embedment. The complete load-displacement relationships for shallow and deep anchors can be simulated by the numerical analysis proposed herein. A minimum horizontal spacing of 10D is needed between neighbouring cylindrical anchors to be free of interference.Key words: cylindrical anchor, uplift behaviour, laboratory model test, numerical analysis, sand.

Ultimate bearing capacity of shallow foundations on sand with geogrid reinforcement

1993 ◽  
Vol 30 (3) ◽  
pp. 545-549 ◽  
Author(s):  
M.T. Omar ◽  
B.M. Das ◽  
V.K. Puri ◽  
S.C. Yen
Keyword(s):  
Bearing Capacity ◽  
Key Words ◽  
Model Test ◽  
Ultimate Bearing Capacity ◽  
Shallow Foundations ◽  
Shallow Foundation ◽  
Laboratory Model ◽  
Critical Depth ◽  
Test Results ◽  
Laboratory Model Test

Laboratory model test results for the ultimate bearing capacity of strip and square foundations supported by sand reinforced with geogrid layers have been presented. Based on the model test results, the critical depth of reinforcement and the dimensions of the geogrid layers for mobilizing the maximum bearing-capacity ratio have been determined and compared. Key words : bearing capacity, geogrid, model test, reinforced sand, shallow foundation.

Laboratory Model Test of EPB Shield Tunneling in a Cobble-Rich Soil

2020 ◽  
Vol 146 (10) ◽  
pp. 04020112 ◽  
Author(s):  
Xiongyu Hu ◽  
Chuan He ◽  
Gabriel Walton ◽  
Yong Fang ◽  
Guanghui Dai
Keyword(s):  
Model Test ◽  
Laboratory Model ◽  
Shield Tunneling ◽  
Laboratory Model Test ◽  
Epb Shield

Frost Heave and Thawing Settlement of Frozen Soils around Concrete Piles: A Laboratory Model Test

2019 ◽  
Vol 49 (2) ◽  
pp. 20180764
Author(s):  
Liyun Tang ◽  
Xiaogang Wang ◽  
Long Jin ◽  
Lijun Deng ◽  
Di Wu
Keyword(s):  
Model Test ◽  
Frost Heave ◽  
Laboratory Model ◽  
Frozen Soils ◽  
Concrete Piles ◽  
Laboratory Model Test

Laboratory Model Test Study of Tunnel Anchor

2014 ◽  
Vol 1065-1069 ◽  
pp. 333-336
Author(s):  
Bing Shen ◽  
Sai Qiong Long ◽  
Jun Chen ◽  
Yong Bing Li
Keyword(s):  
Model Test ◽  
Shear Failure ◽  
Failure Surface ◽  
Tensile Failure ◽  
Laboratory Model ◽  
Pull Out ◽  
Test Study ◽  
Cable Force ◽  
Anchor Design ◽  
Laboratory Model Test

A laboratory model test of tunnel anchor was conducted to investigate its pullout mechanism and bearing capacity. Surface and rock deformation, strain and stress were measured during the entire model test process. The results show that: under pull out load, tensile failure first occurs in top surface rock near the anchor, then shear failure occurs in anchor-rock interface and rock around the anchor. The failure surface is inverted cone from the anchor bottom. Under 50 times design cable force tunnel rock is in elastic stage, suggesting that current tunnel anchor design is quite conservative and can be further optimized.

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