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通过现场试验研究了刚柔同轴组合桩(简称CRFC桩)的桩土荷载分担比、地表沉降、深层水平位移等随路堤荷载和时间的变化规律,并与排水固结法和水泥搅拌桩进行了对比。研究结果表明:(1)路堤填筑初期荷载主要由桩间土承担,且填筑期内桩间土压力逐渐向CRFC桩转移,然而路堤荷载较小时,荷载转移不明显;(2)CRFC桩施工引起的超孔隙水压力消散较快,相比较而言复合地基中CRFC桩施工过程及路基填筑过程中上部孔隙水压力变化较大,下部变化不明显;(3)随着路堤荷载的增加,路堤侧向变形速率减低,且侧向变形在监测后期有一定的恢复变形;(4)与其他处理方式相比,CRFC桩复合地基的总沉降量和工后沉降量小,且沉降收敛快,沉降主要发生在路堤填筑期。
The load-sharing ratio of pile-soil, surface subsidence and deep horizontal displacement of embankment with rigid-soft co-axial composite piles (referred to as CRFC piles) were studied through field tests. Contrast. The results show that: (1) The initial load of embankment is mainly borne by the soil between piles, and the earth pressure between piles gradually transfer to the CRFC pile during the filling period; however, the load transfer is not obvious when the embankment load is small; (2) Compared with the construction process of CRFC pile in composite foundation and the change of pore pressure in the upper part during embankment filling, the change of lower pore pressure is not obvious. (3) With the increase of embankment load , The lateral deformation rate of the embankment is reduced, and the lateral deformation has a certain degree of recovery and deformation in the late stage of monitoring. (4) Compared with other treatment methods, the total settlement and post-construction settlement of CRFC composite foundation are small and the settlement converges quickly Subsidence occurred mainly in the embankment filling period.