Rock and Soil Mechanics ›› 2019, Vol. 40 ›› Issue (2): 465-473.doi: 10.16285/j.rsm.2017.1153

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Effect of confining pressure on mechanical properties of horizontal layered composite rock

ZHOU Hui1, 2, SONG Ming1, 2, ZHANG Chuan-qing1, 2, LU Jing-jing1, 2, LIU Zhen-jiang1，2

, SHI Lin-ken1, 2   

  1. 1. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China; 2.University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2017-09-06 Online:2019-02-11 Published:2019-02-13
  • Supported by:
    This work was supported by the National Program on Key Basic Research Project of China (973 Program) (2014CB046902), the National Natural Science Foundation of China (51427803，51709257) and the Scientific Instrument Developing Project of the Chinese Academy of Sciences(YZ201553).

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Abstract: In order to investigate the effect of confining pressure on deformation and failure characteristics of deep mixed ground, many specimens were made to mimic layered composite rock, considering the geological formation characteristics. Triaxial compression tests were carried out on these specimens to study the effect of confining pressure on deformation and failure characteristics of horizontal layered composite rock. The results showed that: with the increasing of confining pressure, the decreasing rate of partial stress-strain curves became slower and the degree of strain softening was gradually weakened; the damage form of horizontal layered composite rocks evolved with the increase of confining pressure and was translated from brittle to ductile. Under certain confining pressure, the constraint effect of confining pressure on soft rock expansion deformation was weaker than hard rock, which led to uncoordinated expansion deformation between the soft and hard layers. The relative dislocation occurred between the soft and hard layers under the influence of interlayer adhesion. These results can guide construction units to prevent and control the disaster of tunnel boring machine (TBM) in tunneling through deep mixed ground.

Key words: horizontal layered, composite rock, confining pressure, failure mode, swelling deformation

CLC Number: 

  • TU 454
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