Study On Reinforcement Anchoring Properties Of Reinforced Retaining Wall In Panzhihua Area

Since its invention, the reinforced soil technology gains the popularity among the majority of the technical staff with small building height limit, strong adaptability to deformation, low cost, beautiful appearance, etc. Currently, the researchers in engineering and academia conducted a lot of study on the failure mode and structural properties of reinforced soil by the means of theoretical analysis, experimental study and numerical analysis, which promote the development of reinforced soil technology in the field of engineering. In the reinforced soil structure, the interface characteristics of soil and reinforcement directly determines the stability of the reinforced soil structure, so the study on the interface characteristics of soil and reinforcement has significant meaning to improve the safety of the project, reduce project cost, promote further development of the reinforced soil structures. Panzhihua area is mountainous and the terrain ups and downs obviously. The longitudinal slope of ditch bed to fill soil is big and both sides of the bank slope is steep. Since the introduction of the reinforced soil technology in1996, the technology has been widely used in Panzhihua area, spatially in municipal construction and urban roads projects. This paper will study the interfacial properties of reinforced soil structures by pull-out test combined with Panzhihua Technology Bureau project "Experimental Study on the key design parameters of reinforced soil in Panzhihua region", and then analyze the practical engineering in Panzhihua region with the numerical analysis software ABAQUS. the following conclusions are gained through the analysis:(1) The interface friction resistance increases with the vertical stress, but with the increase of the normal stress, increasing amplitude of interface friction resistance is reduced. When the moisture content increases from a small value to the optimum moisture content, the interface friction angle increases and reaches a peak, with the continuous increase of moisture content, the interface friction angle decreases. However, interfacial cohesion has been showing a decreasing trend with the increase of moisture content. The changes of moisture content have greater impact on the interfacial cohesion than the interfacial friction angle.(2) The coefficient of friction decreases with the increases of the normal stress, but the amplitude of the decrease becomes smaller. The friction coefficient decreases as the moisture content increases, the reduced magnitude of the friction coefficient is progressively smaller with the increases of the normal stress.(3) The maximum lateral displacement of reinforced earth retaining wall is located at1/3wall height, lateral displacement along the wall panel shows the trend of increasing first and then decreasing, and shows the bulging features.(4) In the lower part of the retaining wall, the stress of the reinforcement have a relative larger value at the connections panel and reinforcement, as the distance increases along the reinforcement, the stress of reinforcement decreases rapidly, then slowly decreases. In the upper part of the retaining wall, the stress of the reinforcement have a larger value at the connections panel and reinforcement, as the distance increases along the reinforcement, the stress of reinforcement increases and reaches a peak value and then gradually decreases. Meanwhile, as the distance between reinforcement and the top surface of the retaining wall decrease, the location of the maximum value of the stress is away from the panel, and the maximum value of the stress is gradually reduced.