Study On Static And Dynamic Shear Test Characteristics Of Construction Waste Under Different Levels

Since the reform and opening up,with the rapid development of the domestic economy,the urbanization process is advancing rapidly,and the construction of old cities,new urban development zones and infrastructure construction activities are increasing;plus the construction of infrastructure such as urban roads and bridges,maintenance.In the process,a large amount of concrete blocks and waste bricks(hereinafter collectively referred to as construction waste)are increasing.In this paper,through the large-scale direct shear test in the room,the characteristics of the shear interface of different grades of concrete and brick construction waste are studied in detail.The main work is as follows:(1)The performance of different grades as subgrade fillers was studied.The data analysis showed that the construction waste T4 group gradation achieved the best effect.(2)The characteristics of different shear rates were analyzed.The curves of the results obtained by each shear rate were close,indicating that the shear rate had little effect on the monotonic shear characteristicsof the interface.(3)Under cyclic shear,under different vertical stresses,the shear strength of each turn increases with the increase of vertical stress,but the increase is gradually reduced;under high stress,the interface undergoes irreversible The higher the degree of shear shrinkage,the opposite of low stress.The shear strength of the interface will increase with the increase of the shear amplitude.When the amplitude of the large displacement is large,the cyclic shear strength of the single ring will be softened.When the amplitude of the cyclic shear displacement is low,the interface has experienced The longer shear body changes and then the shorter dilatant body changes,while the larger the displacement amplitude is the opposite.