›› 2018, Vol. 39 ›› Issue (10): 3907-3914.doi: 10.16285/j.rsm.2017.0155

• Testing Technology • Previous Articles    

Development of assembled variable dimension direct shear apparatus

XUE Chen1, 2, 3, FU Wen-xi1, 2, HE Si-ming4   

  1. 1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 2. College of Water Resource & Hydropower, Sichuan University, Chengdu, Sichuan 610065, China; 3. China Railway First Survey Design Institute Group Ltd., Xi’an, Shaanxi 710043, China; 4. Key Laboratory of Mountain Hazards and Earth Surface Process, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, Sichuan 610041, China
  • Received:2017-04-28 Online:2018-10-11 Published:2018-11-04
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (41472325), the Science and International Cooperation Project of Sichuan Province (2018HH0082) and the National Program on Key Basic Research Project (973 Program) (2015CB057903).

Abstract: Due to the significant size effect in the direct shear test of coarse grained soil, and the incapability of the general indoor direct shear apparatus to adjust the size of the sample, it is difficult to obtain the shear strength parameters of coarse grained soil. Therefore, an assembled direct shear apparatus which can be employed to change the size of the sample is introduced. This direct shear apparatus is composed of an output device, a displacement measuring device, a reaction frame, and a shear box. By changing the number of steel rings nested in each shear box, the diameter of the sample can be set to be 6.18, 10, 15 and 20 cm. By changing layers of shear boxes, the height of the sample can be set to be 5, 10, 15 and 20 cm. The values of diameter and height of the sample can form 16 combinations in total. On this basis, abandoned slags from the diversion tunnel of Xuecheng Hydropower Station were selected as samples, and then 5 groups of parallel direct shear tests were carried out to verify repeatability of the direct shear apparatus and reliability of the test results. By changing the diameter D and height H, a series of direct shear tests was conducted to study the size effect of the sample, and to determine the reasonable size of the sample.

Key words: coarse grained soil, size effect, modified direct shear apparatus

CLC Number: 

  • TU 415
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