Abstract
This paper presents a case study on groundwater control and environmental protection during a deep excavation of the foundation pit for the Liyang Road Station of Metro Line 10 in Shanghai. A three-dimensional finite element simulation model was constructed to quantify the effects of a dewatering process on the environment around the excavation pit. To understand the decrease in the groundwater level around the foundation pit, the ground settlement and groundwater level were studied. During the excavation, environmental protection methods were used in the design of the optimal watering system to check its detrimental environmental effects. The effects of the diaphragm wall and horizontal barrier system were analyzed by varying their insertion depths and the resulting changes in the ground settlement and groundwater level were studied. It was found that increasing the insertion depth of the diaphragm wall reduced settlement near the excavation site but increased the construction costs. The diaphragm wall used in combination with a horizontal barrier was found to be effective in arresting the decrease in groundwater level and reducing settlement around the excavation site.
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