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Analysis of Excessive Pore Water Pressure of Soil Induced by Shield Tunnelling
(1 Department of Civil Engineering, Zhejiang University City Collage, Hangzhou 310015;
2 Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500)
Abstract The surrounding soil is inevitably disturbed during the process of shield tunnelling, thus excessive pore water pressure is formed in the soil mass. In order to study the value, disturbance range, and distribution law of the excessive pore water pressure caused by shield tunnelling, the stress path method is applied to calculate the peak value of the excessive pore water pressure based on a modified Cambridge Model. The scope of the disturbance is determined by considering such factors as pressure in the soil chamber, static soil pressure at the tunnel center, and soil cohesion. According to Darcy's law, the distribution law of excessive pore water pressure is obtained without considering longitudinal seepage. The calculation and analysis show that: there is a linear relationship between the peak value of excessive pore water pressure and tunnel overburden; the scope of disturbance to the shield tunnelling and peak value of excessive pore water pressure are increased with an increased tunnel overburden; and the variation tendency of excessive pore water pressure is gradually slowed down with an increase of the tunnel overburden, and it tends to be linear as H/D is equal to 1.5.
Abstract：
The surrounding soil is inevitably disturbed during the process of shield tunnelling, thus excessive pore water pressure is formed in the soil mass. In order to study the value, disturbance range, and distribution law of the excessive pore water pressure caused by shield tunnelling, the stress path method is applied to calculate the peak value of the excessive pore water pressure based on a modified Cambridge Model. The scope of the disturbance is determined by considering such factors as pressure in the soil chamber, static soil pressure at the tunnel center, and soil cohesion. According to Darcy's law, the distribution law of excessive pore water pressure is obtained without considering longitudinal seepage. The calculation and analysis show that: there is a linear relationship between the peak value of excessive pore water pressure and tunnel overburden; the scope of disturbance to the shield tunnelling and peak value of excessive pore water pressure are increased with an increased tunnel overburden; and the variation tendency of excessive pore water pressure is gradually slowed down with an increase of the tunnel overburden, and it tends to be linear as H/D is equal to 1.5.
WANG Zhi-Liang-1,
2 ,
SHEN Lin-Fang-2 etc
.Analysis of Excessive Pore Water Pressure of Soil Induced by Shield Tunnelling[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(4): 67-72
2014, Vol. 51 