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Study on Water Head Loss Pattern in Typical Stratigraphic Combination Structure in Xiamen
(1. Xiamen Rail Construction Development Group Co., Ltd., Xiamen 361000; 2. Xi'an Zhongzi Rail Transit Engineering Co., Ltd.,Xi'an 710043; 3. School of Civil Engineering, Fujian University of Technology, Fuzhou 350108)
Abstract During groundwater seepage in weakly permeable stratum, pore water pressure loss happens along the seepage path, and such loss is affected by many factors such as soil mass permeability coefficient, soil layer thickness and water head pressure. The model test on water head loss of composite stratum structure under different water head pressures has been conducted, to investigate how the pore water pressure is propagated in weakly permeable stratum. As the results indicate: In composite stratum structure, pore water pressure decreases as the soil layer thickness increases, pressure jump happens at the interfaces between the soil layers, and feeble confined water occurs in the highly permeable stratum; the water head loss is in positive correlation with water head pressure and soil layer thickness, but in negative correlation with the soil layer permeability coefficient; by using the test results, the relational expression for water head loss Δh, soil mass permeability coefficient, soil layer thickness and water head pressure has been established.
Abstract：
During groundwater seepage in weakly permeable stratum, pore water pressure loss happens along the seepage path, and such loss is affected by many factors such as soil mass permeability coefficient, soil layer thickness and water head pressure. The model test on water head loss of composite stratum structure under different water head pressures has been conducted, to investigate how the pore water pressure is propagated in weakly permeable stratum. As the results indicate: In composite stratum structure, pore water pressure decreases as the soil layer thickness increases, pressure jump happens at the interfaces between the soil layers, and feeble confined water occurs in the highly permeable stratum; the water head loss is in positive correlation with water head pressure and soil layer thickness, but in negative correlation with the soil layer permeability coefficient; by using the test results, the relational expression for water head loss Δh, soil mass permeability coefficient, soil layer thickness and water head pressure has been established.
LIU Zijian1 WANG Jia2 WANG Huayi1 ZHAO Cong2 WU Fan1 ZANG Wanjun3
.Study on Water Head Loss Pattern in Typical Stratigraphic Combination Structure in Xiamen[J] MODERN TUNNELLING TECHNOLOGY, 2024,V61(3): 212-219
2024, Vol. 61 