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Soil Pressure of the Surrounding Rock for a Subway Tunnel across Ground Fissures under a Train Load
(1 School of Architecture and Civil Engineering, Liaocheng University, Liaocheng 252059; 2 School of Geology Engineering and Surveying, Chang′an University, Xi′an 710054)
Abstract Based on the similarity theory, a model for the dynamic interaction between the stratum and a subway tunnel across ground fissures was designed. Based on an analysis of the model test results, the soil pressure of the surrounding rock and the contact pressure between the rock mass and tunnel lining structure under the train load were systematically studied with respect to a horseshoe-shaped subway tunnel across ground fissures in different ways. After analyzing the relevant test data, the following conclusions were determined: 1) if no settlement occurs at the hanging side rock of the ground fissure, there is not a big difference between the soil pressure of the rock mass of a multi-section tunnel and that of an integral tunnel, otherwise there is a big difference between them; 2) as for a multi-section tunnel, the additional soil pressure with ground fissures is larger than that without any ground fis? sures; and 3) as for the two kinds of tunnels, the distribution and magnitude of the contact pressure produced under the action of ground fissures are very close, but the soil pressure in column Y1 of the hanging side decreases largely due to voids caused by ground fissure action compared with the soil pressure in column Y2 at the heading side.
Abstract：
Based on the similarity theory, a model for the dynamic interaction between the stratum and a subway tunnel across ground fissures was designed. Based on an analysis of the model test results, the soil pressure of the surrounding rock and the contact pressure between the rock mass and tunnel lining structure under the train load were systematically studied with respect to a horseshoe-shaped subway tunnel across ground fissures in different ways. After analyzing the relevant test data, the following conclusions were determined: 1) if no settlement occurs at the hanging side rock of the ground fissure, there is not a big difference between the soil pressure of the rock mass of a multi-section tunnel and that of an integral tunnel, otherwise there is a big difference between them; 2) as for a multi-section tunnel, the additional soil pressure with ground fissures is larger than that without any ground fis? sures; and 3) as for the two kinds of tunnels, the distribution and magnitude of the contact pressure produced under the action of ground fissures are very close, but the soil pressure in column Y1 of the hanging side decreases largely due to voids caused by ground fissure action compared with the soil pressure in column Y2 at the heading side.
.Soil Pressure of the Surrounding Rock for a Subway Tunnel across Ground Fissures under a Train Load[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(4): 63-67
2017, Vol. 54 