隧道矿山法施工引起的地表沉降预测研究

Prediction of Ground Surface Settlements due to Tunnel Construction Using Mining Method

借助线性回归法,研究隧道施工引起的地表沉降实测数据与Peck公式的拟合程度,根据岩石复合地层特性,对经典Peck公式进行了修正,并通过数值模拟进行了可靠性验证。结果表明,地铁施工引起的地表沉降符合Peck曲线,经过修正得到的最大地表沉降修正系数α与沉降槽宽度修正系数β的最小值分别为0.8183、0.857,最大值分别为1.1644、1.3792,可为类似地质条件下地铁施工引起的地表变形预测提供理论依据。

The linear regression method is used to study the fitting degree between actual measurement data of ground surface settlement caused by tunnel construction and Peck formula.In consideration of the characteristics of rock composite stratum,the classic Peck formula is modified,and the reliability of modified formula is verified by numerical simulation.The results show that the surface settlement caused by subway construction conforms to Peck curve.The minimum values of the maximum surface settlement correction coefficientαand the settlement trough width correction coefficientβare 0.8133 and 0.857 respectively,and the maximum values are 1.1644 and 1.3792 respectively.The prediction method is able to apply to surface deformation caused by subway construction under similar geological conditions.