冻融及加卸荷条件下川藏交通廊道典型岩石力学特性的劣化规律

汤明高; 许强; 邓文锋; 陈旭; 周剑; 赵欢乐

doi:10.3799/dqkx.2021.260

Volume 47 Issue 6

Jun. 2022

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Article Navigation > Earth Science > 2022 > 47(6): 1917-1931

Tang Minggao, Xu Qiang, Deng Wenfeng, Chen Xu, Zhou Jian, Zhao Huanle, 2022. Degradation Law of Mechanical Properties of Typical Rock in Sichuan-Tibet Traffic Corridor under Freeze-Thaw and Unloading Conditions. Earth Science, 47(6): 1917-1931. doi: 10.3799/dqkx.2021.260

Citation:

Tang Minggao, Xu Qiang, Deng Wenfeng, Chen Xu, Zhou Jian, Zhao Huanle, 2022. Degradation Law of Mechanical Properties of Typical Rock in Sichuan-Tibet Traffic Corridor under Freeze-Thaw and Unloading Conditions. Earth Science, 47(6): 1917-1931. doi: 10.3799/dqkx.2021.260

Citation:

Tang Minggao, Xu Qiang, Deng Wenfeng, Chen Xu, Zhou Jian, Zhao Huanle, 2022. Degradation Law of Mechanical Properties of Typical Rock in Sichuan-Tibet Traffic Corridor under Freeze-Thaw and Unloading Conditions. Earth Science, 47(6): 1917-1931. doi: 10.3799/dqkx.2021.260

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Degradation Law of Mechanical Properties of Typical Rock in Sichuan-Tibet Traffic Corridor under Freeze-Thaw and Unloading Conditions

doi: 10.3799/dqkx.2021.260

State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China

Received Date: 2021-09-26
Publish Date: 2022-06-25

Abstract

Abstract

In order to explore the degradation law of typical rock along Sichuan-Tibet traffic corridor under freeze-thaw cycles, granite, gneiss and sandstone of Changdu-Linzhi section of Sichuan-Tibet traffic corridor were selected as the test objects, and the loading and unloading tests of rock with different freeze-thaw cycles were carried out. The results show follows: (1) With the increase of freeze-thaw cycles, the loss rate of rock compressive strength is 30%, the cohesion decreases by 18.4%, the internal friction angle decreases by 10.5%, the elastic modulus decreases gradually, and the Poisson's ratio increases gradually. (2) In triaxial compression test, the deformation modulus of rock sample presents the degradation law similar to compressive strength. Freeze-thaw action has the most obvious degradation effect on sandstone, followed by gneiss and granite, which is proportional to the compressive strength of rock, and the degradation range of deformation modulus is larger than that of compressive strength. (3) Compared with compression test, in unloading confining pressure test, freeze-thaw cycle also has degradation effect on unloading amount of rock, and the rock degradation is not obvious when the unloading degree is small. With the gradual increase of unloading amount, when the unloading amount is greater than 80%, the deformation modulus of rock decreases exponentially and the Poisson's ratio increases exponentially. (4) With the increase of freeze-thaw cycles, the number of cracks caused by tensile and shear failure increases in triaxial compression tests. The rock of unloading confining pressure test is mainly tensile failure. When the number of micro-cracks increases, the degree of irregularity increases, and the cementation state between mineral particles becomes worse. (5) According to the comprehensive test results, freeze-thaw action has the strongest deterioration effect on sandstone, followed by gneiss, and the weakest is granite.
- Sichuan-Tibet traffic corridor,
- loading and unloading test,
- freeze-thaw cycle,
- mechanical property,
- deterioration law,
- geotechnical engineering

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Degradation Law of Mechanical Properties of Typical Rock in Sichuan-Tibet Traffic Corridor under Freeze-Thaw and Unloading Conditions

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