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http://dx.doi.org/10.7474/TUS.2011.21.3.181

Development of an In Situ Direct Shear Test Apparatus and Its Field Application  

Kim, Yong-Phil ((주)한국건설재료시험연구소)
Lee, Young-Kyun (대림산업주식회사 토목사업부)
Lee, Sung-Kook ((주)한국건설재료시험연구소)
Um, Jeong-Gi (부경대학교 에너지자원공학과)
Publication Information
Tunnel and Underground Space / v.21, no.3, 2011 , pp. 181-191 More about this Journal
Abstract
It is very difficult to prepare a lab. test specimen from weak rock masses affected by faults, highly fractured zone or weathered zone. In conventional method of in situ direct shear test a rock block is sheared inside galleries, where reactions for the hydraulic jacks are available. A new in situ direct shear test apparatus has been developed in this study to perform the test inside galleries as well as open pit conditions. The apparatus is composed of normal and shear reaction plates including load transfer plates, hydraulic cylinder systems, load cells, multistage shear boxes with fixing devices, and needle rollers. Maximum size of the test block is $400{\times}400{\times}460$ mm, and procedures of the test block preparation has been suggested. To explore the field applicability of in situ direct shear test apparatus, proper test block site was investigated by extensive geological field survey. In situ direct shear test has been successful in producing most of information related to strength and deformability of the weak rock.
Keywords
In situ direct shear test; Rock; Strength; Deformation;
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