Multiple loading method for field testing drilled piers

1985 ◽  
Vol 22 (4) ◽  
pp. 592-599
Author(s):  
R. G. Horvath
Keyword(s):  
Test Procedure ◽  
Load Cell ◽  
Load Test ◽  
Test Method ◽  
Single Test ◽  
Loading Test ◽  
Shaft Resistance ◽  
Loading Method ◽  
Multiple Loading ◽  
Base Load

A multiple loading testing method is suggested, which permits testing a single drilled pier foundation under three different conditions of load support. The pier may be tested under conditions of combined shaft and end-bearing resistance, end-bearing resistance only, and shaft resistance only. The advantages of this multiple loading test method include observation of the load-transfer and displacement behaviours of the pier under these three different support conditions and verification of the values obtained for the components of load support, i.e., shaft and end-bearing resistance, all from a single test pier.A special base load cell capable of performing a different function during each cycle of loading is required. A suitable load cell, consisting of a series of Freyssi flatjacks, and the method of operation are described.A multiple loading test procedure was used successfully as part of a field investigation program on full-scale pier sockets in weak shale. Data on the load-displacement behaviour of the pier tested using the multiple loading method are reported. Information concerning piers tested using conventional single loading methods are provided for comparison.The multiple loading test results were in good agreement with results obtained from conventional testing methods. Thus the multiple loading test method provides an economical means of obtaining a large amount of design information for drilled pier foundation systems, using a single test pier. Key words: field load test, multiple loading, drilled piers and caissons, shaft resistance, end-bearing resistance, combined shaft and end-bearing resistances, base load cell, shale.

scholarly journals A Novel Incipient Evaluation Method for Postconstruction Settlement by Using a Statistic Approach with Time-Extended Loading Test

2019 ◽  
Vol 2019 ◽  
pp. 1-12
Author(s):  
Baoning Hong ◽  
Hao Shan ◽  
Xin Liu ◽  
Fenqiang Xu ◽  
Ke Sheng
Keyword(s):  
Field Test ◽  
Test Data ◽  
Evaluation Method ◽  
Early Stage ◽  
Test Procedure ◽  
Assessment Method ◽  
Assessment System ◽  
Test Method ◽  
Loading Test ◽  
Static Loading Test

This paper proposes an incipient assessment method for postconstruction settlement of highway subgrade by using statistical analysis approach with an improved static loading test method, time-extended loading test. The time-extended loading residual settlement Sr(t) and settlement rate Vs(t) are calculated from the field test data. The test procedure and the corresponding experimental validations are presented. Based on the field test data, a probabilistic model is built to bridge the final residual settlement and the actual postconstruction settlements. The proposed time-extended loading test based assessment system has been validated through three operating and well-documented road sections. According to the validation results, the construction quality can be accurately evaluated at an early stage and the corresponding remedial measures can be applied timely.

Comparison of pile load test methods

1989 ◽  
Vol 26 (4) ◽  
pp. 742-744 ◽  
Author(s):  
R. C. Joshi ◽  
H. D. Sharma ◽  
D. G. Sparrow
Keyword(s):  
Axial Force ◽  
Applied Load ◽  
Ultimate Load ◽  
Axial Loading ◽  
Test Methods ◽  
Point Load ◽  
Load Test ◽  
Force Distribution ◽  
Loading Test ◽  
Shaft Resistance

Instrumented model piles were loaded to failure using slow-maintained-load, quick-maintained-load, and constant-rate-of-penetration methods of loading. The piles were driven in a prepared dry-sand bed. The applied load, point load, and shaft resistance were measured using load cells and strain gauges, and axial force distribution was determined. Test data indicate that all the three methods give similar ultimate load at failure. Nonetheless, out of the three methods, the slow-maintained-load method of testing piles, which seems to simulate field conditions, gives the largest settlement for the same applied load. The axial force distribution and shaft resistance along the pile were observed to be identical for all the three pile test methods. Key words: model piles, laboratory study, axial loading, test methods, sands, point load, shaft resistance, ultimate load.

Review and Recommendations for Structural Testing of Buried Gravity Storm Drain Pipes and Culverts

2020 ◽  
Author(s):  
Amin Darabnoush Tehrani ◽  
Zahra Kohankar Kouchesfehani ◽  
Mo Najafi
Keyword(s):  
Large Diameter ◽  
Test Procedure ◽  
Standard Test ◽  
Test Method ◽  
Structural Testing ◽  
Loading Test ◽  
Underground Infrastructure ◽  
Storm Drain ◽  
Testing Condition ◽  
Soil Pipe

Buried pipes are important components of the underground infrastructure. Structural failure of these pipes is costly, socially and environmentally disruptive. Currently, two common standard methods are available for the structural testing of pipes: parallel-plate loading test and three-edge bearing test, in which the effect of surrounding soil and distributed load on the pipe sample are ignored. As of today, there is no standard test method available for structural testing of pipes considering the effect of soil-pipe interaction system. Therefore, the objectives of this paper are to present a literature review of full-scale structural testing methods of relatively large diameter gravity pipes ranging from 90 cm and larger, and suggest a general soil-pipe test procedure for structural evaluation of large diameter gravity pipes, such as culverts. Discussions are made for selection of a soil-pipe structural testing condition, loading method, loading rate,loading configurations and required instrumentations for capturing and recording test results

The Test Analysis of the Bearing Capacity of Foundation

2014 ◽  
Vol 962-965 ◽  
pp. 357-360
Author(s):  
Ya Jun Yin ◽  
Xue Wen Xie ◽  
Yong Mei Qian
Keyword(s):  
Bearing Capacity ◽  
Standard Penetration Test ◽  
Test Methods ◽  
Test Point ◽  
Load Test ◽  
Test Method ◽  
Penetration Test ◽  
Loading Test ◽  
Test Analysis ◽  
Foundation Soil

The test method of shallow plate load was used in the bearing capacity of foundation of Yushu City , doing two groups of loading test in different depths and doing survey and comparative test between test point nearby and sites in the same horizon.It gets the law of foundation soil bearing capacity value got by different test methods and provides the basis for Jilin Province to establish the local standards through the comparison of load test and geotechnical test , static cone penetration test and standard penetration test.

FEM Analysis and Experimental Study for Bond Strength of High-Strength Coating by Wedged Load Test Method

2010 ◽  
Vol 152-153 ◽  
pp. 1058-1061
Author(s):  
Zhou Wei ◽  
Xiao Xia Zhang
Keyword(s):  
Bond Strength ◽  
Adhesion Strength ◽  
Fem Analysis ◽  
High Strength ◽  
Pressure Head ◽  
Optical Microscope ◽  
Complex Stress ◽  
Complex Stress State ◽  
Load Test ◽  
Test Method

A wedged load test method is used to evaluate the adhesion strength of high-strength coatings, which have been processed with various sintering parameters. In this test, for stress concentration at cut tip, cracks are always induced and expanded rapidly cross the interface between coating and substrate. Macro-fracture and SEM image of coating interface of high-strength coating are characterized using optical microscope and scanning electron microscopy (SEM), respectively. In order to evaluate the bonding properties between coating and substrate effectively, corresponding finite element (FE) analysis has been conducted to evaluate the adhesion strength of high-strength coating. And stress distributions cross the interface of high-strength coating are obtained. The stress analysis can help to evaluate the bond strength of high-strength coating. Because of small specimen and contact relationship between wedged pressure head and wedged cuts, complex stress state is affected by many factors resulting from interface, and also by the thickness of coating.

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