摘要
以北京一地铁区间隧道暗挖施工引起的地表沉降分析为例,研究地表沉降分布规律及其时程分布规律。在大量实测数据的基础上,基于Peck公式进行地表沉降分布的回归分析,并通过修正,得到最大程度包络实测数据的高斯曲线,从而得到地表沉降的范围;基于Logistic函数模型,进行地表沉降随时间变化的回归分析,得到地表沉降时程分布规律和沉降速度时程分布规律。通过该方法得到的地表沉降时空预测曲线与隧道的土层性质、施工方法等密切相关。计算得到的沉降槽宽度系数、地层损失率、时间参数等可为预测沉降的时空分布提供参考数据。
Taking the ground settlements analysis caused by tunnel excavation construction in one Beijing subway as an example, this paper carried out regress analysis of ground settlements distribution based on Peck formula by a large number of measured data, and got Gaussian curves which can include the measured data to the maximal degree and the forecast range of ground settlements through modifying. The regress analysis of ground settlements with time changing based on Logistic function is also implemented and the distribution law of ground settlements with time and velocity distribution law with time are also obtained. The space-time predicting curves calculated by this method are closely associated with the construction method and tunnel soil condition, and the calculated parameters such as settlement trough width coefficient, ground loss rate, time parameter can establish the database, which could predict the space-time distribution of ground settlement well.
出处
《铁道建筑》
北大核心
2014年第4期58-62,共5页
Railway Engineering
基金
北京城建勘测设计研究院科研专项基金(2011年院基金)
