Study On Bearing Capacity Of Adjacent Foundations Constructed On Sand Reinforced Under Cyclic Loading

Geosynthetics reinforced structures are widely used in reinforced foundation,reinforced embankment and other construction and traffic engineering fields.The existing achievements are mainly the study of bearing capacity of foundation under independent foundation,and few studies are related to reinforced foundation under adjacent foundation.Most foundations are subjected to the interaction of adjacent overlying loads and cyclic dynamic loads.This paper takes " Study on Bearing Capacity of Adjacent Foundations Constructed on Sand Reinforced under Cyclic Loading " as the topic.In this paper,a largescale model test of reinforced adjacent foundations is designed.The working mechanism of adjacent foundations under static and cyclic dynamic loads is analyzed,the bearing capacity and failure mode of reinforced structures are studied,and the influencing factors of bearing capacity of reinforced adjacent foundations are studied from the aspects of reinforcement,foundation spacing and grid layout.In the numerical aspect,the test conditions are deeply analyzed,focusing on the relevant parameters such as the buried depth of the first layer of reinforcement,the effective length of reinforcement and the dynamic response of adjacent foundation under cyclic dynamic load.The main results are as follows:(1)A large-scale test of adjacent foundation reinforced foundation under static load was carried out for different basic spacing and presence or absence of reinforcement.The p-s curve,foundation soil pressure,and strain of the material were analyzed to study the bearing characteristics and failure modes of adjacent foundations under static load.It is concluded that the optimal spacing of adjacent foundation reinforced foundations is Δ/B=1.5.(2)On the basis of large-scale static load test in the laboratory,the experimental study on reinforced foundation of adjacent foundation under cyclic load is carried out,and bearing characteristics of reinforced foundation of adjacent foundation under dynamic and static load are compared and analyzed.The change of load property has obvious influence on the failure mode of foundation.The continuity of reinforcement has a great influence on the bearing capacity of foundation.The bearing capacity of discontinuous foundation with reinforcement is 14% lower than that of continuous foundation with reinforcement.(3)Through numerical simulation and laboratory test verification,the parameters of the reinforcement of the adjacent foundation reinforced foundation is studied.The optimal(economic)reinforcement parameters of adjacent foundation reinforced foundation under dynamic load is proposed.The first layer buried depth μ=0.6B,the length of the rib material is 1.5B from the outer edge of the adjacent foundation,and the number of reinforced layers N is 3 layers.(4)Based on the simulation study of adjacent foundation under static and dynamic loads,the conclusion is drawn.Whether pure sand foundation or reinforced foundation,there are uplifts on the outside of the foundation.The settlement or uplift between foundations is controlled by the spacing between foundations.The spacing between foundations is too small,and the soil between foundations will settle with the settlement of foundations.Increasing the number of cycles of cyclic loads will increase the soil uplift between and outside the foundation,while the reinforcement layout can reduce the uplift of the foundation soil.