- ISSN 0258-2724
- CN 51-1277/U
- EI Compendex
- Scopus
- Indexed by Core Journals of China, Chinese S&T Journal Citation Reports
- Chinese S&T Journal Citation Reports
- Chinese Science Citation Database
| Citation: | ZHOU Hongfu, WEI Yuting. Mechanical Parameters of Concealed Fault Rock Mass on Nujiang River[J]. Journal of Southwest Jiaotong University, 2022, 57(1): 166-172, 199. doi: 10.3969/j.issn.0258-2724.20200314
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The rock mass in a fault zone is a special type of rock mass that has attracted wide attention in the field of civil engineering. Triaxial tests are conducted on the rock mass of a concealed fault zone of a hydropower project on the Nujiang river to obtain the mechanical parameters of the rock mass in the concealed fault zone under confining pressure. Moreover, a systematic method (rock mass sampling in a fault zone, pretreatment of the rock mass prior to test, application of initial confining pressure, triaxial test, and evaluation of mechanical parameters) is summarized. This method avoids the effects of the disintegration of the fault zone and the hydraulic fluid on the samples when the triaxial test is conducted. In this way, the obtained mechanical parameters will be closer to the actual mechanical parameters of the rock mass in the fault zone in a natural state. The results show that the deformation modulus of five samples range from 449 MPa to 921 MPa, with the average value being 665 MPa. The cohesion ranges from 0.04 MPa to 0.22 MPa, with the average value being 0.13 MPa and the standard value being 0.12 MPa at a guarantee rate of 80%. The internal friction coefficient ranges from 0.32 to 0.61, with the average value being 0.46 and the standard value being 0.35 at a guarantee rate of 80%. In addition, the test values of cohesion are more discrete than those of the internal friction coefficient, indicating that the cohesion of the fault zone rock mass is more deeply affected by the material structure, fault gouge content, and cementation degree.
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