The Comparative Study Of Different Calculation Methods Of Enclosure Structure Of Row Piles

Currently, many methods are used in the calculation of enclosure structure ofrow piles. Choosing appropriate calculation method is a key factor for the safe andreasonable design of enclosure structure. In this article, based on the open-cutfoundation pit section, which is near the Shuangliu Airport, of Chengmianle specialline, depending on the monitoring datas, the calculation of enclosure structure isdone with different methods. After that, the calculated values of each method arecompared with the measured ones, so that we can analyze and evaluate thecommonly used calculation theories, and we can draw some directivity significantconclusions to the foundation and calculation of enclosure structure of row piles. Themajor researches of this article are as follows:(1) The moment of enclosure piles, lateral displacement of pile shafts, axialforce of supports, and soil pressure before and after enclosure piles are calculatedwith respectively equivalent beam method, elastic foundation beam method andnumerical stimulation method. According to the comparison between calculatedvalues and measured ones, we can analyze and evaluate the calculation methods ofenclosure structure, and figure out the most appropriate one.(2) Using tow-dimension numerical stimulation method to calculate andcomparing the internal force of enclosure structure and displacement on differentplatform width conditions, the influence rules of platform width on enclosurestructure and displacement can be evaluated. Comparing the influence depth range ofsolid pressure caused by over loading after piles between classical methods andnumerical stimulation on different platform width conditions, the influence rules ofplatform width on solid pressure after piles can be evaluated, too.(3) The foundation pit is excavated with upper and lower bench cut method.According to the calculation of enclosure structure with longitudinally different steplength and excavation progress that are based on the three-dimension numericalmodel, we can study the influence rules of step length and excavation progress on theinternal force and displacement of enclosure structure. Depending on the steps above, the proper step length and excavation progress in the construction of open cutfoundation pit section near Shuangliu Airport can be found out.(4) Finally, based on the in-situ measured values, we can analyze the keyworking procedure affecting the internal force and deformation of enclosure structure,as well as the change law of internal force and displacement of enclosure structure inthe process of construction. Afterwards, construction advice on reducing deformationof enclosure structure and improving the stability of foundation pit is given.