岩土工程学报2024，Vol.46Issue(10)：2101-2110,10.DOI:10.11779/CJGE20230633
考虑推进过程的土压平衡盾构渗流场解析解及喷涌判别
Analytical solution for seepage field and spewing discrimination during propulsion process of earth pressure balance shield
摘要
Abstract
Considering the excess pore water pressure generated by the additional thrust on the shield front during the propulsion process,the shield spewing problem is analyzed by the analytical method.The seepage field in soil chamber is divided into two regions,the superposition principle and the separation variable method are used to obtain the explicit level solution for the water head in the soil chamber,the flow field inside the screw conveyor is regarded as one-dimensional seepage,and the analytical solution for the shield seepage field is determined by using the continuity condition of the intersection between the soil chamber and the screw conveyor.The correctness of the solution is verified through the numerical simulation results,and the parameters are analyzed.The parameter analysis shows that the ratio of shield thrust fluctuation frequency to soil consolidation coefficient in the normal tunneling state is about 0.1～10 m-2,which corresponds to the permeability coefficient 10-3～10-5 cm/s,when the ratio is greater than 20 m-2,the influences of the excess pore water pressure can be ignored,and when the ratio is less than 0.01 m-2,the water pressure distribution approximates in the steady-state seepage state,but for the ratio near 1 m-2,the excess pore water pressure will have a significant impact.Combined with the existing spewing researches,the critical permeability coefficient of a typical shield in different ratios thrust fluctuation frequency to soil consolidation coefficient is given.By comparing the shield spewing examples,the spewing discrimination of the analytical solution is proved to be effective.关键词
土压平衡盾构/喷涌/临界渗透系数/波动水压力/水流量/波动推力Key words
earth pressure balance shield/spewing/critical permeability coefficient/fluctuating water pressure/water flow/fluctuating thrust分类
建筑与水利引用本文复制引用
余俊,郑靖凡,张志中,李东凯,和振..考虑推进过程的土压平衡盾构渗流场解析解及喷涌判别[J].岩土工程学报,2024,46(10):2101-2110,10.基金项目
国家自然科学基金项目(52078496,52478427) （52078496,52478427）
