Field Test Research on Embankment Supported by Plastic Tube Cast-in-place Concrete Piles
Field Test Research on Embankment Supported by Plastic Tube Cast-in-place Concrete Piles
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DOI：
10.1007/s10706-013-9660-4
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发表时间：
2013-05
影响因子：
1.7
通讯作者：
Yong-hui Chen;C. Qi;H. Xu;C. Ng
中科院分区：
文献类型：
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作者：
Yong-hui Chen;C. Qi;H. Xu;C. Ng
小直径塑料管混凝土现浇桩（TC桩）是由填充混凝土的预打孔塑料管组成。以软土地基上TC桩加筋路堤为例，根据TC桩加筋路堤系统的监测数据，分析了该系统的处理效果和加固特点。现场监测结果表明，路基临界高度约为桩网距的1.1倍，小间距布置TC桩可应用于低路堤工程；荷载分担率能较好、稳定地反映土体拱起程度，监测期末荷载分担率超过70%；桩承台沉降和桩间土沉降主要发生在路堤施工阶段；当路堤高度约为2.2倍桩网距时，桩承台与土体的沉降差接近最大值，然后逐渐减小。层状沉降和孔隙水压力的变化表明，路基沉降主要是由桩长内土体的压缩引起的，约占总沉降的90%；孔隙水压力影响深度约为桩长1/3。
The plastic tube cast-in-place concrete pile (TC pile) with a small diameter consists of pre-driven plastic tube filled with concrete. Based on the case of TC pile-reinforced embankment on soft ground, and according to the monitoring data of the TC pile-reinforced embankment system, the treatment effect and reinforcement characteristics for this system were analyzed. The field monitoring results indicates that the critical height of embankment is about 1.1 times the pile net spacing, and the small-spacing arranged TC piles can be applied to low embankment engineering; the load share rate can reflect the degree of soil arching more better and steadily and exceeds 70 % at the end of monitoring period; the settlements of pile cap and soil between piles mainly occurs in the embankment construction period; the different settlement between pile cap and soil approaches the maximum and then reduces gradually when the embankment height is about 2.2 times the pile net spacing. The variation of layered settlement and pore water pressure illustrates that the embankment settlement is mainly caused by the compression of soils within pile length, which is about 90 % of the total settlement; the influence depth of pore water pressure is about 1/3 pile length.