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| ANALYSIS OF DIRECT SHEAR TEST DATA BASED ON AREA AND STRESS CORRECTION |
| YU Kai1，2，YAO Xin1，ZHANG Yongshuang1，LI Chenggong3，OU Lu4 |
(1. Institute of Geomechanics，Chinese Academy of Geological Sciences，Beijing 100081，China；
2. College of Engineering and Technology，China University of Geosciences，Beijing 100083，China；
3. School of Economics and Management，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；
4. Institute of Geology and Geophysics，Chinese Academy of Sciences，Beijing 100029，China) |
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Abstract The direct shear test(DST) is widely used because of its convenience and economy. It is of great significance to improve the reliability of the DST data. Based on the summary of former test results，the DST data correction is divide into two types，single-point area correction method and multipoint area correction method. By simplifying the force analysis model of shearing soil，an area-stress correction(ASC) method is presented. The results show that this method is effective and reliable. The corrected strength parameters are more than those of other two methods. A simple discussion on the practical application of these methods is done. In the derivation process，the area correction coefficient and the normal stress correction coefficient are put forward. The correction coefficients of ASC show that the shear stress on the effective shear plane is greater than the measured results；and the normal stress on the effective shear area is less than the applied vertical stress with the shear displacement increasing. The normal stress on the non-effective shear plane is increasing. Since the disadvantages and defects of the DST，there are some differences between the corrected strength parameters and those of triaxial test. The mathematical analysis and test results indicate that ASC method is effective and reliable. It improves the accuracy of soil shear strength parameters obtained from DST.
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Received: 30 January 2013
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2014, Vol. 33 
