基于双曲线法云南地区深厚人工填土沉降预测分析

以中石油云南省某专用铁路场坪堆载预压下人工填土地基沉降现场试验数据,分析了深厚人工填土地基在堆载预压下沉降变形规律,研究了时间因素对双曲线法沉降预测结果的影响,并给出观测数据不充分时预测值的修正方法。分析结果表明:堆载完成初期人工填土地基沉降主要为瞬时沉降,堆载一段时间后沉降为固结沉降;采用双曲线法预测装卸场地基的沉降时,时间起点取21天最合适,时间终点越大、观测数据越多,预测结果越准确;在预测点观测数据不充分的情况下,采用多个试验点分析得到的修正系数修正预测值可有效地减小预测误差。

Analysis on Settlement Prediction of Deep Artificial Fill in Yunnan Regions Based on Hyperbola Method

With the data from field test on foundation settlement of artificial fill under surcharge preloading at CNPC private railway station yard in Yunnan, this paper analyzed the deformation law of foundation in deep artificial fill under surcharge preloading, studied the influence of time factor on settlement prediction by hyperbola method, and gave the correction method for underprediction of observations. The results show that the settlement of artificial fill foundation at the initial stage after preloading is of immediate settlement mainly and then consolidated settlement after loaded for a period of time; when the prediction of settlement at the handling yard is conducted by hyperbola method, the starting point of time prefers 21 days, and the later the ending point and the more the observations, the more accurate the predictions; when the observations at the predicted point are insufficient, the predicted values corrected by the correction factor from multiple test point may reduce the prediction error effectively.