首页|Compression failure conditions of concrete-granite combined body with different roughness interface

Compression failure conditions of concrete-granite combined body with different roughness interface

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Bedrock and concrete lining are typical composite structures in the engineering field and the stability of the geological body and engineering body is directly connected to the mechanical properties of the com-posite body.Under this background,the study provides the transverse isotropic equivalent model of concrete-granite double-layer composite based on the notion of strain energy equivalence.Assuming that the strength failure of concrete and granite meets the Mohr-Coulomb criterion,then the strength failure model of the combined body considering the joint roughness coefficient(JRC)is derived,and the influ-ences of JRC,the height ratio of concrete to granite,and confining pressure on the strength failure char-acteristics of the combined body are emphatically analyzed.Finally,the model applicability is illustrated by the uniaxial and triaxial compression tests on concrete monomer,granite monomer and concrete-granite composite samples(CGCSs)with different JRCs.The results revealed that the compressive strength of the composite is closer to the concrete with lower strength in the combined body under dif-ferent confining pressures.Adding interface roughness causes to raise the compressive strength of the composite due to interfacial adhesion between concrete and granite,and a slowing growth trend is observed in compressive strength as roughness.The model can provide a certain reference for the stabil-ity design and evaluation of engineering rock mass.

Concrete-granite combined bodyCompression failure conditionInterface roughnessMechanical model

Huan Gao、Yue Zhai、Tienan Wang、Yubai Li、Fandong Meng、Houquan Zhang、Yan Li

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School of Geology Engineering and Geomatics,Chang'an University,Xi'an 710064,China

Key Laboratory of Western China's Mineral Resources and Geological Engineering of Ministry of Education,Chang'an University,Xi'an 710054,China

State Key Laboratory of Geomechanics and Deep Underground Engineering,China University of Mining and Technology,Xuzhou 221116,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaDepartment of Science and Technology of Shaanxi Province"111"Center,Program of the Ministry of Education of ChinaNatural Science Foundation of Shaanxi ProvinceFundamental Research Funds for the Central Universities,CHD

41941019522741452021TD-55B180462020JQ-373300102261101

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(3)
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