Abstract：
Based on a EPB shield running tunnel of Fuzhou metro line 2 in soft ground, it summarized the charac? teristics of ground settlement by analyzing the monitoring data and driving parameters during shield construction,and proposed the parameters of modified hyperbolic model for predicting ground settlement with consideration of the measured settlements. The analysis results indicate that the settlements caused by ground loss and consolidation during EPB shield construction in soft ground as well as the long-term horizontal settlements in transverse direction conform to the results by Peck equation; the affected scope during shield driving is 3D-5D ahead of the cutterhead and it results in small amount of heaving(settlement); the ground settlements are mainly the ground loss induced settlement and consolidation settlement of disturbed soil mass within 3-5 d after passing shield tail, with the percentages of 65% and 32% of the total settlement respectively in the course of measuring, and actually the percentage of final consolidation settlement is larger; the modified hyperbolic model can be used to predict ground settlements at central axis caused by EPB shield driving in soft ground of Fuzhou, and the ranges of parameter values of a, b, c are -0.14~0.67 mm/d, -0.028~0.042 mm-1 and -0.89~7.67 mm respectively.
ZHONG Junhui1,
2 YIN Peilin1,
2 LIU Jun1 etc
.Analysis on the Characteristics of Ground Surface Settlement Caused by EPB Shield Tunnelling in Fuzhou Soft Ground[J] MODERN TUNNELLING TECHNOLOGY, 2019,V56(5): 180-186
2019, Vol. 56 