中文摘要：

塑料套管混凝土桩（TC桩）是由预先打设在地基中的塑料套管内浇注混凝土组成的,适用于软土地基处理工程中,具有承载力高、施工速度快和成桩质量可靠等优点。通过TC桩承载力的模型和现场试验,研究了TC桩的工作性状,并考虑到路堤柔性荷载下刚性桩复合地基桩土存在沉降差,分别采用Mindlin应力解计算塑料套管桩群在复合地基中产生的附加应力,采用Boussinesq解计算地基土荷载产生的附加应力,叠加塑料套管桩群桩和地基土产生的附加应力,采用分层总和法计算复合地基沉降量。研究结果表明：TC桩承载力具有明显的时效性,其不同间歇期的承载特性有显著差别;所建立的TC桩沉降计算方法的计算值与实测值相一致。

英文摘要：

The plastic tube cast-in-place concrete pile （TC pile）, which is suitable for soft ground treatment, is comprised of pre-driven plastic tube filled with concrete, which has the advantages of high bearing capacity, fast construction speed and reliable pile quality etc. According to the model and in-situ tests on bearing capacity of TC piles, the working behaviors of TC piles are investigated. Taking into account the pile-soil settlement difference of rigid pile composite foundation under embankment load, the additional stresses generated by pile groups and foundation soils are separately computed by using the Mindlin stress solution and the Boussinesq solution. The two kinds of stresses are added together, and the settlement of composite foundation is calculated by using the layer-wise summation method. The results show that the bearing capacity oITC piles exhibits obvious, time-dependent behaviors, however, there are significantly different beating behaviors in different intermissions, and the calculated results of settlements of TC piles agree well with the measured data.