Investigation of the availability of a new point load test device in characterization of rocks

The point load test and rebound tests were part of a simple rock testing methods, which together with a user-friendly, work environment characterized by less demanding test, so test the application of rock in the tunnel are very broad. Obtained by these two tests of rock uniaxial compressive strength Rc saturation level for the characterization of rock hard quantitative indicators, in the rock classification has a high status. With the computer technology in tunnel works in the field of application that can batch test data to establish the tunnel surrounding rock classification system. Article is based on two kinds of test in the same tunnel project in contrast to the use, through the rock classification system to analyze and evaluate both.

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Analysis of point load test as a method for preliminary geotechnical classification of rocks

Bulletin of Engineering Geology and the Environment ◽

10.1007/bf02635318 ◽

1973 ◽

Vol 7 (1) ◽

pp. 37-52 ◽

Cited By ~ 15

Author(s):

Guidicini G. ◽

C. M. Nieble ◽

A. T. Cornides

Keyword(s):

Point Load ◽

Load Test ◽

Point Load Test

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Point-load test and UPV for compressive strength prediction of recycled coarse aggregate concrete via generalized GMDH-class neural network

Construction and Building Materials ◽

10.1016/j.conbuildmat.2020.122143 ◽

2021 ◽

Vol 276 ◽

pp. 122143

Author(s):

Hossein Razzaghi ◽

Rahmat Madandoust ◽

Hassan Aghabarati

Keyword(s):

Neural Network ◽

Compressive Strength ◽

Coarse Aggregate ◽

Point Load ◽

Load Test ◽

Strength Prediction ◽

Aggregate Concrete ◽

Recycled Coarse Aggregate ◽

Point Load Test

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Point Load Test of Half-Cylinder Core Using the Numerical Model and Laboratory Tests: Size Suggestion and Correlation with Cylinder Core

Advances in Civil Engineering ◽

10.1155/2018/3870583 ◽

2018 ◽

Vol 2018 ◽

pp. 1-11 ◽

Cited By ~ 2

Author(s):

Fengyu Ren ◽

Huan Liu ◽

Rongxing He ◽

Guanghui Li ◽

Yang Liu

Keyword(s):

Numerical Model ◽

Laboratory Tests ◽

Failure Load ◽

Field Tests ◽

Point Load ◽

Diameter Ratio ◽

Load Test ◽

Index Test ◽

Point Load Test ◽

Calculation Procedures

The point load test (PLT) is intended as an index test for rock strength classification or estimations of other strength parameters because it is economical and simple to conduct in the laboratory and in field tests. In the literature, calculation procedures for cylinder cores, blocks, or irregular lumps can be found, but no study has researched such procedures for half-cylinder cores. This paper presents the numerical model and laboratory tests for half-cylinder and cylinder specimens. The results for half-cylinder and cylinder specimens are then presented, analysed, and discussed. A correlation of failure load between half-cylinder and cylinder specimens is established with a suitable size suggestion and correction factor. It is found that the failure load becomes stable when half-cylinder specimens have a length/diameter ratio higher than 0.9. In addition, the results show that the point load strength index (PLSI) of half-cylinder cores can be calculated using the calculation procedures for diametral testing on cylinder cores, and it is necessary to satisfy the conditions that the length/diameter ratio be higher than 0.9 and the failure load be multiplied by 0.8.

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