| The double-row pile-cable supporting structure which takes the technical advantages of double-row piles and pile-anchor supports and commendably combines the two supports into a whole is a relatively novel form of supports.However,to date,there is still a lack of researches on this supporting structures and the data of actual measurement on the spot is critically deficient.In such case,the theory of the double-row pile-cable supporting structure is far behind the demand of the actual application.The finite element analysis is mostly based on two-dimensional model without considering the spatial effects,so it has certain limitations.In this study,the stress of the double-row pile-anchor supporting structure is analyzed and calculated on the basis of the common calculation methods of double-row piles and pile-anchor supporting structures.The commercial software ABAQUS is used to create a three-dimensional numerical model of the support structure that is based on the form of foundation pit engineering adopted for the Maanshan integrated passenger transport center hub station.And according to the process of excavation and support in the foundation pit,the mechanical analysis of the front and rear row piles is conducted.The main research results are as follows:(1)The status of domestic and foreign researches on double-row piles and pile-anchor retaining structures is briefly summarized,and the current problems in the research of double-row pile-anchor support structures is pointed out;(2)A calculation model of the double-row pile-anchor support structure is proposed by analogy with the calculation method of double-row piles with pile-anchor retaining structures and the rationality of the calculation results are verified with Lizheng deep foundation pit 7.0 software.(3)ABAQUS software is used to simulate the practical project of the foundation pit engineering of Maanshan integrated passenger transport center hub station project in this study.And the lateral movement of soil,soil settlement and uplift and deformation of the double row pile on different working condition under double-row pile-anchor support are detailedly analyzed.The feasibility of numerical simulation results are verified through the analysis of on-site monitoring data.(4)Double-row pile diameter,pile spacing,anchor prestress,and anchor cable inclination angle are selected as the influence factors to analyze the horizontal displacement and bending moment variation law of the front and rear row piles andthe results may provide guidelines to optimize the design of the double-row pile-cable support. |
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