Rock-filled Concrete Structure Construction Cold Joint Shear Performance Research

Rock-filled concrete(RFC)is a new type of mass concrete based on self-compacting concrete(SCC).Because of its low cost and convenient construction,it has been widely used in water conservancy projects in the past decade.The cold joints of rock-filled concrete have significant influence on the engineering characteristics of such structures.For this reason,this paper systematically studies the shear performance of rock-filled concrete based on the shear performance test of rock-filled concrete.This article independently designed and optimized the indoor concrete shear laboratory experiment,and conducted the RFC cold seam shear test under different vertical forces.Through the failure rule and failure mode,the shear failure mechanism was analyzed.The stress-strain equations for shear strength between concrete layers determine the shear friction coefficient and shear-resistance cohesion of RFC.At the same time,the compressive strength test of the standard concrete test block was carried out,and the failure mechanisms of the three standard test pieces of the self-compacting concrete test block,the rock-filled concrete test block,and the rock were analyzed.The numerical calculation model of rock-filled concrete was further developed.Based on the three-dimensional scanning reconstruction method of the shear plane,the contact function density of each sheared surface block stone is obtained,and a numerical model of the rock-filled concrete is constructed.By comparing the experimental failure models at 0,1,and 2 MPa,it is verified that The reliability of numerical simulations.Then carry out numerical analysis of parameter analysis,comprehensive analysis of the shear failure mechanism of rock-filled concreteThe breaking mechanism of rock-filled concrete: In the shear failure of the rock-filled concrete,as the vertical force increases,the greater the shear force,the more serious the wear and tear of the rock-filled.The damage of the specimen is caused by the shearing of the self-compacting concrete,the fracture of the internal shear surface of the rock-filled,and the damage of the grinding stone at the joint surface of the block stone and the self-compacting concrete.Due to the high strength of the rock-filled,the shear failure is caused by self-compacting wear and tear,and the grinding shears connecting the cold joint surface gradually fall off,and then the inner shear cracks are generated due to the grinding and shearing of the rock-filled,and the cracks are cut and the texture is cut.At the same time,the interface between the rock-filled and the self-compacting concrete is sheared off and the specimens are eventually destroyed.Comparing with the test of the standard concrete test block,it was verified that the strength of the block stone is high,and the damage is usually delayed.It can be seen that the existence of rock-filled plays a crucial role in the shear resistance of the specimen.The analysis did the shear calculation formula of rock-filled concrete.Based on the shear failure mechanism of rock-filled concrete,the influencing factors of the equation were analyzed.Compared with the previous research results,the scope of application was proposed.At the same time,considering the need for optimization and amplification in practical projects,it provides a reference for the application of rock-filled concrete structures in practical projects.The results of the study show that in the inter shear failure of rock-filled concrete,as the vertical force increases,the shear stress it receives is greater,and tear of the rock is more serious.The destruction of the test specimen is caused by self-compacting concrete.Grinding and shearing are crushed,the fracture of the internal shear surface of the rock is broken,and the grinding shear of the joint surface of the block stone and the self-compacting concrete is composed of three parts.Due to the high strength of the rock,the shear failure is caused by self-compacting wear and tear,and the grinding shears connecting the cold joint surface gradually fall off.After that,the internal shears are damaged by the grinding and shearing of the rock,and the cracks are cut and the texture is cut.At the same time,the interface between the rock-filled and the self-compacting concrete is sheared off and the specimens are eventually destroyed.Comparing with the test of the standard concrete test block,it was verified that the strength of the block stone is high,and the damage is usually delayed.It can be seen that the existence of rock-filled plays a crucial role in the shear resistance of the specimen.Finally,the shear failure mechanism of the rock-filled concrete is integrated,and the influencing factors of the stress-strain equation of the shear failure are analyzed and compared with the previous research results,the applicable scope is proposed,and the actual project needs to be optimized for amplification.The construction of rock-filled concrete in the actual project provides reference for the construction of cold joints.