带受力盘塑料套管混凝土桩桥头处理研究

为研究带受力盘塑料套管混凝土桩(带受力盘TC桩)在桥头处理中的桩土应力比以及侧向位移情况,以上海市奉浦大道工程为依托,在桥头处理段埋设相关试验仪器。通过持续的数据监测,在积累了较多的实测数据的基础上,对所得数据进行科学分析,得出带受力盘TC桩桩土应力比分布,发现在较低的路堤填土下难以形成土拱效应;以及由于施工工艺使得路基下土层存在一个较长的土体回挤过程。最后指出在带受力盘TC桩施工完成后应施加足够的荷载并持续足够时间,使得桩周土能充分回挤,从而使得带受力盘TC桩能充分发挥其强度,减少桥头段沉降。

The research on bridgehead segment of plastic tube cast-in-place concrete pile with supporting disc

The pile-soil stress ratio and the lateral displacement of plastic tube cast-in-place concrete pile with supporting disc(TC pile with disc) in the engineering of bridgehead segment was investigated by relying on road engineering in Shanghai and laying the relevant test equipment in the engineering of bridgehead segment. Based on persisted data monitoring,the TC pile with disc's pile-soil stress ratio distribution was obtained from the measured data with scientific analysis. It was found that it is hard to form soil arching under the lower embankment; and the soil under roadbed has a long soil return extrusion because of the construction process. Then the paper pointed out that after the TC pile with disc completed should apply enough load and continued enough time,make the soil around the pile to fully return extrusion,so that the TC pile with disc can full play its strength,reducing the bridge section settlement.