| The rapid economic development and the accelerated pace of urbanization have generated a large amount of construction waste and used tires.Dealing with large amounts of construction waste and used tires has become an urgent environmental issue.Aiming at the current common methods of waste tire resource utilization,there are serious problems of secondary pollution,large energy consumption and high cost,as well as the current situation of construction waste occupying the land and polluting the environment.This paper proposes technologies for ecological disposal and resource utilization of waste tires and construction waste geotechnical engineering.Through the indoor foundation model test and numerical simulation analysis,the mechanical properties and working mechanism of the waste tire reinforced construction garbage ground are studied,and the application of this technology in geotechnical engineering is promoted.Furthermore,the level of disposal and recycling of waste tires and construction waste will be improved to promote sustainable economic and social development.In order to determine the basic performance indexes of foundation fillers and reinforced materials in indoor model tests.Through the foundation filler particle analysis test,compaction test and tendon tensile test,the construction waste filler is compared with the conventional filler sand,and the waste tire is compared with the geocell.Obtain the engineering technical indicators of the gradation curve,compaction curve and used tires and geocells of the construction waste soil and sand.In order to study the mechanical properties of the waste tire reinforced construction waste ground foundation under the square foundation,the construction waste soil was compared with sand soil,added to the geocell and the waste tire foundation was compared with the unreinforced foundation.Twelve sets of indoor flat load tests were conducted at 65%and 95% compaction degrees.The effects of different degrees of compaction,different foundation fillers and different reinforced materials on load-settlement relationship,reinforced bearing capacity ratio,bearing capacity improvement factor and settlement reduction ratio were compared and analyzed.Quantified the superiority of waste tire reinforced construction waste ground in terms of improving bearing capacity and reducing settlement.Through the indoor foundation model test,the surface soil deformation of the foundation and the vertical earth pressure distribution in the foundation were studied,and then the working mechanism of the reinforced foundation was briefly discussed.The numerical simulation software PLAXIS was used to simulate and analyze the waste tire reinforced construction waste soil foundation.Two control groups were selected to study the feasibility of using waste tires and construction waste for reinforced foundation from the point of numerical simulation analysis.The data obtained by numerical simulation is compared with the data obtained from indoor model tests to further study the mechanical properties and overall deformationcharacteristics of the reinforced foundation.The research content includes the load-settlement characteristics of the reinforced foundation,the deformation of the soil surface and the change of the internal earth pressure.Research indicates:(1)The construction waste soil filler obtained after recovery processing is a well-graded foundation filler,and the sand used in the test is well-graded sand.Construction waste soil has a good compaction effect and is a foundation filler with good performance.The ultimate tensile strength of the waste tire is greater than that of the geocell,and the ultimate elongation of the waste tire is larger and the tensile modulus is smaller.(2)The bearing capacity and initial stiffness of the foundation with increased compaction increase,while the settlement decreases.The load-settlement characteristics of construction waste soil are better than sand.Under the low settlement ratio of construction waste ground,the bearing capacity of unreinforced foundation is the highest.With the development of settlement deformation,the bearing capacity of reinforced foundation gradually exceeds that of unreinforced foundation.The construction waste soil foundation shows better reinforcement effect under high pressure.Under the same conditions,the reinforcement effect of waste tires is better than that of geocells.Reinforcement strain develops faster in high-pressure solid construction waste soil.Before and after adding used tires,the difference in settlement value of the construction waste soil foundation is not large,and the calculated settlement reduction ratio is less than the sand foundation value.In terms of reducing the settlement of the foundation,the reinforcement effect of the used tire is better.The response of the soil surface deformation away from the center to the base load is smaller than that near the center.The soil surface uplift value under high pressure solidity is greater than the value under low pressure solidity.Construction waste soil can effectively reduce the uplift of the filling surface.The addition of reinforcement makes the deformation of the soil surface more uniform.Under the same foundation load,the earth pressure value of the high-pressure solid foundation is higher than that of the low-pressure solid foundation.Compared with traditional foundations,construction waste land foundation can spread the foundation load to a wider range,thereby reducing the foundation soil pressure.After the reinforcement is added,the earth pressure value drops significantly,and the earth pressure of the tire reinforced foundation is less than that of the lattice reinforced foundation.The earth pressure inside the foundation is non-linearly distributed along the horizontal direction,and the addition of reinforcement makes the earth pressure inside the foundation more evenly distributed in the horizontal direction.(3)The numerical simulation results show that under the same load,the settlement of the waste tire reinforced construction waste soil foundation is less than that of the reinforced sand foundation,and the foundation performance is relatively good.In the construction waste soil foundation,the performance of the reinforced foundation of waste tires is better than that of the geocell reinforced foundation.The numerical calculation cannot accurately simulate the actual test conditions,but the overall trend of the simulation results is approximately the same as the indoor test,which has certainreference significance for the performance research of the waste tire reinforced construction waste ground foundation.Compared with sand,construction waste soil can reduce the deformation of the soil surface settlement caused by foundation settlement.At the end of the test,the soil surface deformation value of the reinforced foundation of the used tires is less than that of the geocell reinforced foundation,and the response of the soil away from the center of the foundation to the foundation load is less than that of the soil near the center of the foundation.Use waste tires instead of geocells,the soil surface deformation is more uniform.The use of high-strength construction waste soil as the foundation filler can reduce the soil pressure inside the foundation.Compared with geocells,the reinforced foundation of waste tires has improved the performance of the construction waste ground better.The earth pressure inside the foundation is non-linearly distributed horizontally.The numerical simulation found that the influence range of the upper load of the reinforced foundation on the earth pressure is not large. |
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