Abstract The three main factors affecting ground settlement in shield tunnelling are the gap behind the tunnel lin? ing, the distribution mode of the grout and the deformation of soil at the excavation face, all of which are closely related to soil conditions and construction technology. There is not adequate quantitative research on these factors.Based on the stochastic medium theory, and the three parameters of equivalent gap value Δ1 , the distribution angle α of equivalent gap and negative ground loss value Δ2 were introduced to represent the three factors above, and a formula was deducted to predict 3D ground settlement in shield tunnelling. A quantitative analysis of the ground settlement affected by the parameters of Δ1 and α was performed. Based on the measured settlement data, a back-analysis was conducted to obtain the 3D solutions for predicting settlement values. The values of ground settlement calculated by this method were compared with the on-site measured data and the values of ground settlement calculated by a modified Peck formula, which shows the method proposed in this paper can predict the values and distribution characteristics of ground settlement more accurately, therefore verifying the reasonableness and reliability of this method.
Abstract：
The three main factors affecting ground settlement in shield tunnelling are the gap behind the tunnel lin? ing, the distribution mode of the grout and the deformation of soil at the excavation face, all of which are closely related to soil conditions and construction technology. There is not adequate quantitative research on these factors.Based on the stochastic medium theory, and the three parameters of equivalent gap value Δ1 , the distribution angle α of equivalent gap and negative ground loss value Δ2 were introduced to represent the three factors above, and a formula was deducted to predict 3D ground settlement in shield tunnelling. A quantitative analysis of the ground settlement affected by the parameters of Δ1 and α was performed. Based on the measured settlement data, a back-analysis was conducted to obtain the 3D solutions for predicting settlement values. The values of ground settlement calculated by this method were compared with the on-site measured data and the values of ground settlement calculated by a modified Peck formula, which shows the method proposed in this paper can predict the values and distribution characteristics of ground settlement more accurately, therefore verifying the reasonableness and reliability of this method.
.Stochastic Prediction Method for Ground Settlements Considering Gaps behind the Lining and Grout Distribution Modes[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(4): 137-145
2017, Vol. 54 