Abstract
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.
基金项目
National Natural Science Foundation of China(41941019)
National Natural Science Foundation of China(52274145)
Department of Science and Technology of Shaanxi Province(2021TD-55)
"111"Center,Program of the Ministry of Education of China(B18046)
Natural Science Foundation of Shaanxi Province(2020JQ-373)
Fundamental Research Funds for the Central Universities,CHD(300102261101)
NETL
NSTL
维普
万方数据