Study On The Distribution Of Earth Pressure Of Super High Balance Weight Retaining Wall And Its Engineering Application

With the development of construction in Western China,a large number of slope protection projects have emerged.As a form of slope support,the distribution of earth pressure behind the retaining wall is not clear,which leads to the doubt of engineering design,Therefore,this paper is based on the balance weight retaining wall support project of Tianneng coal coking expansion project,Through the combination of on-site monitoring and theoretical analysis,the research on the earth pressure distribution law and engineering application of super high balance weight retaining wall is carried out,and the following main conclusions are obtained:(1)This paper analyzes and summarizes the existing calculation and design theory of the earth pressure of the balance weight retaining wall,compares several slope support schemes according to the characteristics of the actual project and geological conditions,and finally selects the super high balance weight retaining wall support.Based on the large-scale triaxial shear test,the mechanical analysis of the soil layer of the slope is carried out,and the mechanical parameters of the slope support design are obtained.(2)The monitoring results show that:with the increase of the pouring height of the lower wall,the base pressure of the retaining wall increases linearly,and the distribution of the base pressure is "saddle shaped";after the pouring of the upper wall,the gravity center of the retaining wall gradually moves forward,and the base pressure gradually adjusts from "saddle shaped" to "inverted Z-shaped".(3)Based on the field monitoring and theoretical analysis of earth pressure behind the counterweight retaining wall,the distribution law of earth pressure on the balance weight retaining wall is studied.The results show that,compared with the straight-line retaining wall,the balance platform plays a role in changing the earth pressure distribution,and the"covering" effect is more obvious;the earth pressure behind the counterweight retaining wall is characterized by "upper wall triangle lower wall parabola" The value of resultant force of earth pressure is close to that of theoretical calculation,but the action point of resultant force of measured earth pressure is lower than that of theoretical calculation.(4)Through monitoring the horizontal displacement of the balance weight retaining wall,it is found that the slope support of the project has significant spatial effect,and the horizontal displacement distribution pattern of the top of the balance weight retaining wall is "large in the middle and small at the two ends".