![]() Controlling groundwater level effectively during excavation has become a major research task 1, 2, 3, 4, 5, 6, 7. The majority of the accidents in foundation pit are concerned with groundwater. The contradiction between the increasing drawdown and strict requirements of surrounding land subsidence, as well as groundwater resource protection, is also expanding. The excavation depth is continuously increased under the urbanization demand, and the required drawdown is increasing correspondingly. Meanwhile, controlling the environment influence of lowering ground water level is also important. ![]() Dealing with the multi-aquifer is important for a deep excavation. Multi-aquifer and multi aquitard are often encountered during underground exploitation. In the aspect of engineering geology, engineering hydrogeology is important for a coastal city. Underground space is developed to serve the development of the city. Similar content being viewed by othersĬoastal cities are often developed in the economy because of convenient transportation. Four seepage modes were summarized considering vertical curtain penetration conditions into multi-aquifer, and the fifth seepage mode was formed for vertical curtain using man-made HSRB, which can be referred by similar engineering applications. Decreasing HSRB hydraulic conductivity was better than increasing HSRB depth. The non-separated HSRB was better than the separate HSRB. Numerical method was used to simulate and understand the influence of position, thickness, and hydraulic conductivity of HSRB on groundwater level. Microbially induced carbonate precipitation grouting technology was recommended to form an environment-friendly HSRB. 4 shaft foundation pit of Guangyuan Project, Shanghai as background, HSRB was proposed in foundation pit dewatering. In the manuscript, a man-made horizontal seepage reducing body (HSRB) was introduced to shorten the vertical curtain depth and control drawdown. ![]() However, the cost and working difficulty increases substantially with the rise in depth of vertical curtains. A vertical curtain is usually adopted to control the drawdown inside and outside a foundation pit in a built-up area. Groundwater level has to be lowered during deep excavation.
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