Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (3): 798-804.doi: 10.13278/j.cnki.jjuese.201603201

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Experimental Study on Mechanical Properties of Frozen Soft Rock of Cretaceous Formation in Bojianghaizi Mine

Zhu Jie1, Xu Ying1, Li Dongwei1, Chen Junhao2   

  1. 1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, Anhui, China;
    2. College of Civil Engineering, Fujian University of Technology, Fuzhou 350118, China
  • Received:2015-09-03 Online:2016-05-26 Published:2016-05-26
  • Supported by:

    Supported by the National Natural Science Foundation of China (51504070), the National Natural Science Foundation of China(41301074, 41271071) and the Key Scientific and Technical Program of Anhui Province (1501041123)

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Abstract:

Triaxial compression tests at different temperatures(-20~20℃) were carried out for medium sandstone and mudstone of cretaceous formation in Bojianghaizi mine.The results show that between -20~20℃ the peak strength and modulus of elasticity of the soft rock increase with temperature decreasing and confining pressure rising. The variation degree of peak strength of medium sandstone is obviously higher than that of mudstone, that is to say the former has higher sensitivity to temperature. At the same time, the peak axial strain declines with temperature decreasing.Furthermore, the peak angle of internal friction and cohesion increase with the drop of temperature, and the increase of the shear strength index mainly reflects in the cohesion.Through the analysis of experiment results, mechanical properties and law of cretaceous frozen soft rock in the different confining pressures and low temperatures are recognized, which can provide reliable basis for the design and construction of mine with freezing method in the western region.

Key words: Cretaceous Formation, low temperature, frozen soft rock, peak strength

CLC Number: 

  • P642.14

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