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Water Science and Engineering 2009, 2(3) 48-57  DOI:   10.3882/j.issn.1674-2370.2009.03.005   ISSN: 1674-2370 CN: 32-1785/TV

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in situzz')" href="#">in situ
direct shear test
shear strength
Si-hong LIU
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Application of in situ direct shear device to shear strength measurement of rockfill materials

Si-hong LIU*1, 2

1. Research Institute of Hydraulic Structures, Hohai University, Nanjing 210098, P. R. China
2. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,
Hohai University, Nanjing 210098, P. R. China


A simplified in situ direct shear test (DST) was developed for measuring the shear strength of soils in fields. In this test, a latticed shearing frame replaces the upper half of the shear box used in the conventional direct shear box test. The latticed shearing frame is directly embedded in the ground to be tested after a construction process and is pulled with a flexible chain while a constant dead load is applied to the sample in the shearing frame. This simplified in situ DST has been validated by comparing its results with those of triaxial tests on samples with parallel gradations under normal stresses less than 100 kPa. In this study, the DST was further validated by carrying out tests on samples with the same gradations, rather than on samples with parallel gradations, under normal stresses up to 880 kPa. In addition, the DST was performed inside fills in two applications.

Keywordsin situzz')" href="#"> in situ   direct shear test   shear strength   rockfill  
Received 2009-08-06 Revised 2009-09-12 Online:  
DOI: 10.3882/j.issn.1674-2370.2009.03.005
Corresponding Authors: Si-hong LIU
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