Shear Damage Characteristics of Rock-Concrete Interface at Change of Temperature
The change of environment temperature changes the mechanical properties of the interface between sur-rounding rock and lining of tunnel,which directly affects the bearing characteristics of lining structure and the safety and stability of surrounding rock of tunnel.Three intervention schemes of varying temperature curing modes were designed to carry out the test of uniaxial compression of concrete and direct shear of rock-concrete.The stress-strain curves of con-crete and the interface shear stress-displacement curves of rock-concrete under the intervention of different temperature changes were obtained.And then the changing laws of mechanical properties,relative stiffness and interface shear damage evolution rate of rock-concrete under the intervention of varying temperature were analyzed.The results show that the higher the initial intervention temperature is,the greater the interface peak shear strength and shear stiffness is;The greater the relative stiffness of rock-concrete is,the better the post-peak shear brittleness of the interface is,and the grea-ter the interface shear damage evolution rate is.The influence of initial intervention temperature has been dominant.The relative stiffness of rock-concrete has been positively related with the evolution rate of interfacial shear damage.The rele-vant research results have theoretical support for the bearing performance evaluation of tunnel lining structures under high ground temperature and variable temperature environment.
environment temperature changerock concretemechanical propertiesinterface damage characteris-ticsrelative stiffness
万方数据
维普
