CAJ | 학술논문

桩板结构在国内多条高速铁路软土和黄土路基中已得到广泛应用，但该结构用于处理路基采空区的研究成果不多。以合肥至福州高速铁路采空巷道上方车站桩板复合路基为研究对象，数值模拟分析路基的受力机理。研究表明：桩身轴力呈上大下小变化趋势，所有桩均为端承摩擦桩，穿过采空巷道的桩在采空巷道范围内轴力保持不变；所有桩桩侧摩阻力都呈现出先增大后减小的趋势，桩的侧摩阻力分布重心下移，穿过采空区的桩侧摩阻力分布重心要比未穿越采空区的桩要深，桩身越长侧摩阻力所占承载力比例越大；采空区复合路基的桩土应力比要比软土路基的小。
장판결구재국내다조고속철로연토화황토로기중이득도엄범응용，단해결구용우처리로기채공구적연구성과불다。이합비지복주고속철로채공항도상방차참장판복합로기위연구대상，수치모의분석로기적수력궤리。연구표명：장신축력정상대하소변화추세，소유장균위단승마찰장，천과채공항도적장재채공항도범위내축력보지불변；소유장장측마조력도정현출선증대후감소적추세，장적측마조력분포중심하이，천과채공구적장측마조력분포중심요비미천월채공구적장요심，장신월장측마조력소점승재력비례월대；채공구복합로기적장토응력비요비연토로기적소。
Sheet-pile structure had been widely used for treating the soft soil or loess soil subgrade of domestic high-speed railway, but for treating the goaf area, there was little research result. For this reason, in this study, the sheet-pile composite subgrade above a goaf roadway at a station of Hefei-Fuzhou high-speed railway was taken as research object, and the numerical simulation was conducted to analyze the stress mechanism of this subgrade. The research results show that:( a) The axial force along the pile shaft presents a change trend of large top and small bottom basically; all of the piles are end-bearing friction piles;the axial forces of pile shafts within the range of goaf roadway remain the same during passing through the goaf roadway. ( b) All of the pile side frictions present a trend of increasing first and then decreasing;and the orthocenter of pile side friction distribution is downward, especially the orthocenter of pile side friction distribution of the piles in the goaf area is much deeper than that of piles not in the goaf area; the longer the pile shaft is, the greater the proportion of side friction in bearing capacity becomes. ( c) The pile-soil stress ratio of composite subgrade in goaf area is smaller than that of subgrade in soft soil.