哈尔滨粉质粘土地层隧道沉降规律

基于哈尔滨地铁1号线同江路站-哈尔滨南站区间地表沉降的实测数据及地层信息,分析地表沉降槽宽度和地层损失率的变化规律,并在此基础上对Peck公式回归分析,得出适用于哈尔滨粉质黏土地层隧道的地表沉降修正系数。结果表明:粉质黏土地层沉降槽宽度与隧道埋深之间可用线性关系表示,此时沉降槽宽度系数的取值范围为0. 42～0. 6;当地层损失率在0. 46%～0. 59%之间时,能够更好地预测土体的体积损失量;当地表最大沉降修正系数的范围为0. 4～0. 7、沉降槽宽度修正系数的范围为0. 9～1. 3时,通过相似地质情况的哈尔滨地铁3号线旭升街站-松江生态园站区间实测数据进行验证,发现修正后的Peck公式能够更好地预测地表沉降。

Settlement Rule of Tunnel in Harbin Silty Clay Soil Stratum

Based on the measured data and stratum information of surface settlement in Tongjiang Road Station to Harbin South Station of Harbin Metro Line 1, the variation of the width of the settlement trough and the formation loss rate is analyzed, and on this basis, the correction coefficient of surface settlement suitable for Harbin silty clay stratum tunnel is obtained by regression analysis of Peck formula. The results show that the relationship between the width of settlement trough and the buried depth of the tunnel can be expressed as a linear relationship. Furthermore, the width coefficient of settlement trough ranges from 0.42 to 0.6; when the formation loss rate is between 0.46% and 0.59%, the volume loss of soil can be better predicted; and when the maximum surface settlement correction coefficient ranged from 0.4 to 0.7 and the width correction coefficient of settlement trough ranged from 0.9 to 1.3, it was verified by the measured data between Xushengjie station and Songjiang ecological park station of Harbin metro line 3 under similar geological conditions, and found that the revised Peck formula could better predict surface settlement.