Analysis of load-bearing characteristics of new composite foundation with micro steel pipe pile and anchor
In order to solve the problems of large material consumption,prominent construction safety problems,poor environmental and water protection benefits,long construction period and inconvenient transportation of traditional anchor foundation of transmission lines,a prefabricated transmission line steel group anchor foundation was proposed,including steel structure and new composite foundation with micro steel pipe pile and anchor.The three-dimensional refined numerical model of a single micro steel pipe pile and anchor combination foundation was established using finite element method,the changes in stress and displacement fields of composite foundation anchor bar,grout,steel pipe and surrounding rock under various load conditions were studied.The calculation results were compared with those of common anchor foundation.The influence of factors such as steel pipe size and rock strength on the bearing performance of the new composite foundation were analyzed.The quantitative relationship between the horizontal displacement of the new composite foundation and the strength of the rock mass was discussed.The steel pipe,concrete inside the steel pipe,and anchor bars were simplified into a holistic mechanical model.Based on the Winkler elastic foundation beam method,a horizontal displacement calculation method for single micro steel pipe pile and anchor combination foundation was established,and the calculation results were compared with numerical simulation results.The results show that under the same working conditions,the stress and displacement of the new composite foundation anchor bars,grout,and surrounding rock are smaller.The new composite foundation is suitable for situations where the rock mass grade is extremely soft.The displacement generated by the new composite foundation under various load conditions gradually increases as the rock strength decreases.When the quality of the rock mass is poor,measures such as increasing the cross-sectional area and length of the steel pipe can be taken to limit the horizontal displacement of the composite foundation.
transmission line foundationmicro steel pipe pileanchor foundationrock masscomplex load
万方数据
维普
