Abstract：Abstract ： Research purposes ： The thick compressible foundation settlement control is the key technology of subgrade in the construction of high - speed railway. Based on the in - site test data and analysis of different types of ground treatment in the test section of Tianjin - Baoding Railway， this paper reveals the relations between the subgrade settlement and the type of reinforcement pile，pile spacing，length of pile and pile top foundation structure in deep thick compression layer of ground soil，selects proper method for settlement calculation and analysis. Research conclusion ：( 1 ) Since the settlement characteristics of prestressed pipe pile reinforced foundation and CFG pile reinforced foundation， pile top raft foundation and pile cap - net foundation are similar， the same settlement calculation method can be utilized. (2 ) If the diameter of pile and reinforcement depth is same， the pipe pile reinforcement spacing shall be the spacing of CFG pile plus one times of diameter of pile to achieve close settlement control. (3) If the type of pile，diameter of pile，pile spacing and reinforcement depth is same，the subgrade settlement of cap - net foundation is 1.4 times of raft foundation. (4) The thickness of compression layer shall be selected based on 0. 1 of the stress ratio when utilizing composite modulus method for subgrade settlement calculation，and 0. 2 of the stress ratio if equivalent application method is adopted. (5 ) When combining the 0. 6 times of calculation results based on composite modulus method with the 0. 4 times of equivalent application method calculation results，the fitness between the calculation results and field data increases dramatically. (6) The research results can be the guidance of subgrade settlement control design under condition of thick compressible foundation.
崔维孝. 津保铁路试验段路基沉降特性研究[J]. 铁道工程学报, 2016, 33(10): 36-40.
CUI Wei – xiao. Research on the Settlement Characteristics of Subgrade in the Test Section of Tianjin - Baoding Railway. Journal of Railway Engineering Society, 2016, 33(10): 36-40.
2016, Vol. 33 
版权所有 © 2014 《铁道工程学报》编辑部