Abstract The shield tunnelling of the Red Line Light Rail project in Tel Aviv, Israel, traverses composite strata mainly composed by silty-fine sand, silty sand and sandstone. In light of the problem that it is difficult to reasonably calculate the soil chamber pressure of the shield in composite strata, the strata passed by the running tunnel are divided into four rock-soil groups, and on the basis of determining the physical and mechanical parameters of each rock-soil group, this paper combines Protodyakonov's theory with the empirical method, J&S method and A&K method commonly used in European norms to calculate the soil pressures of the four rock-soil groups, and analyzes the calculation results. The analysis shows that using the average value of the three calculation methods it can effectively avoid the limitations of calculating the soil pressure through a single method, and the soil chamber pressure varies with the height of the groundwater table but is independent of the thickness of the overburden soil layer. By comparing the calculation results of this method with the actual pressure while intervention, it verifies the accuracy of this method in calculating the soil chamber pressure of shield tunnelling in Israel composite strata, providing reference and guidance for the construction parameters of similar projects.
Abstract：
The shield tunnelling of the Red Line Light Rail project in Tel Aviv, Israel, traverses composite strata mainly composed by silty-fine sand, silty sand and sandstone. In light of the problem that it is difficult to reasonably calculate the soil chamber pressure of the shield in composite strata, the strata passed by the running tunnel are divided into four rock-soil groups, and on the basis of determining the physical and mechanical parameters of each rock-soil group, this paper combines Protodyakonov's theory with the empirical method, J&S method and A&K method commonly used in European norms to calculate the soil pressures of the four rock-soil groups, and analyzes the calculation results. The analysis shows that using the average value of the three calculation methods it can effectively avoid the limitations of calculating the soil pressure through a single method, and the soil chamber pressure varies with the height of the groundwater table but is independent of the thickness of the overburden soil layer. By comparing the calculation results of this method with the actual pressure while intervention, it verifies the accuracy of this method in calculating the soil chamber pressure of shield tunnelling in Israel composite strata, providing reference and guidance for the construction parameters of similar projects.
AN Hongbin
.Analysis on Calculation Methods for the Soil Chamber Pressure in Composite Strata Shield Tunnelling in Israel[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(1): 154-159
2021, Vol. 58 