【摘要】 路桥过渡段差异沉降严重影响行车安全性和舒适性,深厚软土路段如何处理好路桥过渡段的工后沉降显得尤为重要。针对深厚软土区软基深度大、软基处理难度高、造价高的特点,总结了深厚软土区路桥过渡段刚性过渡、柔性过渡、刚–柔结合过渡三种差异沉降控制方案。针对三种过渡方案分别采用预应力管桩复合地基、真空预压+气泡混合轻质土路堤、长短桩复合地基进行工程实践,结合施工参数及监测数据对加固效果进行分析研究,并对三种软基处理过渡方案进行技术经济比较。研究表明,三种过渡方案均有效可行,但在施工周期、沉降控制效果和经济性上存在一定差异。总体上,当填土高度一定时,刚性过渡、刚–柔结合过渡造价相对较高,且处理深度越大,柔性过渡在造价上的优势越明显。更多还原

【Abstract】 The differential settlement of road bridge transition section seriously affects the safety and comfort of driving. According to the characteristics of deep soft soil area, such as large depth of soft foundation, high difficulty of soft foundation treatment and high cost, three differential settlement control schemes of rigid transition, flexible transition and rigid flexible combination transition are summarized. According to the three transition schemes, prestressed pipe pile composite foundation, vacuum preloading + air bubble mixed light soil embankment and long short pile composite foundation are respectively adopted for engineering practice. Combined with construction parameters and monitoring data, the reinforcement effect is analyzed and studied, and the technical and economic comparison of three transition schemes for soft foundation treatment is made. The results show that the three transition schemes are effective and feasible, but there are some differences in construction period, settlement control effect and economy. In general,when the filling height is fixed, the cost of rigid transition and rigid flexible transition is relatively high, and the greater the treatment depth, the more obvious the advantage of flexible transition in cost.更多还原