Abstract During shield tunnel construction, the shield attitude often deviates from the designed axis, leading to changes in tunnel loads. In view of this, a parametric analysis is conducted to study the variation law of additional earth pressure in tunnels under different geological conditions, tunnel burial depths, attitude deviations, and tunnel diameters. And it investigates the influence of various factors on the variation of additional earth pressure. The results indicate that any angle of shield deviation will cause an increase in earth pressure on the side of the deviation and a decrease in the earth pressure on the opposite side. The variation of additional earth pressure caused by shield attitude deviation is more significant in sandy soil layers than in clay soil layers. When the shield body deviation angle is -90°, 0°, and 90°, the impact on additional earth pressure in sandy soil is 199.47%, 636.08%, and 162.04%,respectively, compared to clay soil layers. As the parameter values increase, the influence of tunnel burial depth and diameter on additional earth pressure decreases, while the influence of shield attitude deviation on additional earth pressure increases. The sensitivity of additional earth pressure to changes in tunnel burial depth and diameter gradually decreases, while the sensitivity to attitude deviation remains essentially unchanged.
Abstract：
During shield tunnel construction, the shield attitude often deviates from the designed axis, leading to changes in tunnel loads. In view of this, a parametric analysis is conducted to study the variation law of additional earth pressure in tunnels under different geological conditions, tunnel burial depths, attitude deviations, and tunnel diameters. And it investigates the influence of various factors on the variation of additional earth pressure. The results indicate that any angle of shield deviation will cause an increase in earth pressure on the side of the deviation and a decrease in the earth pressure on the opposite side. The variation of additional earth pressure caused by shield attitude deviation is more significant in sandy soil layers than in clay soil layers. When the shield body deviation angle is -90°, 0°, and 90°, the impact on additional earth pressure in sandy soil is 199.47%, 636.08%, and 162.04%,respectively, compared to clay soil layers. As the parameter values increase, the influence of tunnel burial depth and diameter on additional earth pressure decreases, while the influence of shield attitude deviation on additional earth pressure increases. The sensitivity of additional earth pressure to changes in tunnel burial depth and diameter gradually decreases, while the sensitivity to attitude deviation remains essentially unchanged.
XIAO Mingqing1 FENG Kun2 XUE Guangqiao1 WANG Yunchao2 LU Zhipeng1 CHEN Long2
.Study on the Influence Factors of Additional Earth Pressure Caused by Shield Attitude Deviation in Soft Soil Strata[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(2): 141-150
2025, Vol. 62 