Experimental Study On Bond Behavior Of Cement Soil With Reinforced Interface Based On Uniform Design

With the rapid development of China's economy,the construction of infrastructure has gradually increased to accelerate,in order to adapt to the sustainable development of domestic and foreign industries,reinforced cement soil and anchor support structure should be born.However,there is a lack of in-depth study and theoretical study on the shear deformation characteristics of steel bars and cement soil interfaces.Therefore,with the support of National Natural Science Foundation(41572298),the research work of this paper is devoted to the systematic experimental study on the bonding property of reinforced cement soil interface,in order to provide some guidance and help for the subsequent development of reinforced cement-soil pile(anchor)support structure in the use of safe use and effective recycling.Firstly,the manpower and material resources of comprehensive experimental study is limited,so the design of uniform design theory is introduced in this paper.Through a series of indoor drawing tests,the influence of soil water content and dry density on the bonding strength of anchor-soil interface was obtained,the whole process curves of shear stress-displacement of anchor-soil interface were studied,and the empirical formulas of shear strength and soil water content and dry density were established.Secondly,based on the idea of micro-element method,a set of test specimen method is designed for bonding strength of reinforced cement-soil interface.The three factors that affect the strength of cement soil(cement ratio,water content,age)are designed and tested on bonding properties of reinforced-cement-soil interface based on uniform test design.According to the test results of 12 batches of specimen drawing tests and the corresponding cube-free compressive strength test,the empirical model of the Interfacial ultimate bond strength and the non-lateral compressive strength and residual strength of the cube was established.At the same time,the regression equations between the ultimate bonding strength and the cement ratio,water content and age are obtained through the regression analysis,which can be used in the soft soil reinforcement practice,and the influence regularity of the factors in this equation is further analyzed and discussed.It is shown that the ultimate bond strength and cement ratio increases with power function,and decreases with the increase of the reinforcement water gradually,and last until the stabilization;linear relationship with logarithmic approximation of age.Finally,according to the stress-strain curves obtained from the test,a three trilinear model is applied to characterize the tensile properties of the reinforced cement soil interface,and the load transfer method is used to analyze the force deformation of full-length bonded reinforced concrete soil.At the same time,the influence of the change of peak point displacement,ultimate bond strength(cement ratio,water content,age)on the deformation behavior of the reinforced concrete soil interface is discussed.The degree of impact from large to small is cement ratio,water content,age.