High-strength model material production for structural plane replica and its shear testing

• Published in: KSCE journal of civil engineering Vol. 22; no. 1; pp. 174 - 184
• Main Authors: Ji, Feng, Liu, Changjiang, Zhang, Yu, Zheng, Luobing, Pan, Kai, Tan, Xun
• Format: Journal Article
• Language: English
• Published: Seoul Korean Society of Civil Engineers 2018; Springer Nature B.V; 대한토목학회
• Subjects: Civil Engineering; Dilatancy; Engineering; Geotechnical Engineering & Applied Earth Sciences; High strength; In situ measurement; Industrial Pollution Prevention; Laboratories; Lasers; Mathematical models; Methods; Mixtures; Model testing; Molds; Morphology; Parameters; Planes; Shear strength; Shear tests; Stability; Stability analysis; Structural Engineering; Three dimensional printing; 토목공학; 3D print; physical simulation; structural plane; mix proportion; high-strength mold material; laser scanner; shear test
• ISSN: 1226-7988; 1976-3808
• DOI: 10.1007/s12205-017-0636-4

Shear strength parameters (
c
,
φ
) of a structural plane are the key factors for the stability assessment of rock masses. The shear strength parameters are obtained by a structure plane shear test carried out in laboratory. However, it is difficult to obtain test samples with the same surface morphology and to remove the effect of surface irregularity from test results. Based on the similarity principle and orthogonal test, this paper presents a new model preparation method for structural planes using a high-strength mold mixture material. Firstly, the original morphology of the structural plane is recorded by in situ measurement using a laser device and then the mold of the structural plane is reproduced using a 3D printer. Subsequently, a mix proportion test of the high-strength mold material is conducted using the orthogonal test, and the model of the structural plane is prepared by pouring this high-strength mixture material into the 3D mold. Ultimately, the shear strength parameters of this high-strength structural plane replica are obtained using a shear box test in the laboratory. The proposed method has particular advantages such as the preparation of multiple replicas for structure planes and the ability to obtain repeatable results.