Method for lowering water by combining phreatic water in footing groove with artesian aquifer - well stratifications
A technology for confined aquifers and confined water, applied in infrastructure engineering, construction, etc., can solve the problems of small treatment depth, high engineering cost, and large number of wells, and achieve significant economic benefits, reduce the number of wells, and open Effect of digging construction efficiency improvement
Active Publication Date: 2009-07-22
SUNYOUNG CONSTR GROUP
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Problems solved by technology
This dewatering method has a large number of wells, a small treatment depth, and high engineering cost. It is only limited to the dewatering reinforcement treatment of soft soil foundations, and is not suitable for foundation pit dewatering.
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[0027] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.
[0028] Embodiment Take the foundation pit dewatering project of a subway station in Shanghai as an example.
[0029] A subway station in Shanghai has two floors underground, and the main body is a three-story two-span (partial three-story three-span, second-story two-span) cast-in-place reinforced concrete structure. The main structure of the station is 313.5 meters long and 22.8 meters wide. The excavation of the foundation pit of the station is divided into two areas. The excavation depth is 22.39 meters in the south end of the well, 23.01 meters in the north end o...
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The invention relates to a method for combined dewatering of foundation pit diving and a well layered dewatering of a confined aquifer in the technical field of underground engineering construction. It includes the following steps: the dewatering well adopts a well structure; the controllable water stop valve is closed when the water is drained; it is determined by the three-dimensional groundwater seepage analysis finite element, and the determined water pumping volume and the influence radius are determined; when the excavation goes deep into the aquifer , extracting water in the confined aquifer to reduce the water pressure; according to the plane size of the foundation pit, excavation depth, buried depth of the underground wall, and aquifer structure conditions; the application of finite element calculation based on three-dimensional groundwater seepage and land subsidence Methods To determine the excavation depth, pumping volume, diameter and quantity of wells, influence radius of hydraulic gradient and surrounding land subsidence when the confined water is lowered. Compared with the existing method, the present invention can reduce the number of wells by 1 / 3 to 1 / 2, save 30 to 50% of the dewatering construction cost, and is suitable for foundation pits containing submerged layers-water-resisting layers-confined aquifers and need to be reduced. Precipitation engineering of pressurized water head.
Description
technical field [0001] The invention relates to a construction method in the technical field of underground engineering construction, in particular to a method for joint dewatering of foundation pit diving and confined aquifer-well stratification. Background technique [0002] Underground construction in soft soil foundation with high groundwater level, such as foundation pit excavation, the biggest problem in construction is that the existence of groundwater will cause water gushing at the bottom of the foundation pit. Therefore, using well points or large-diameter tube wells to artificially lower the groundwater level is a common and effective method in excavation construction of foundation pits. The method of foundation pit excavation generally adopts dry excavation, that is, the water in the soil body that needs to be excavated is drained first (keep the groundwater level at 1m below the excavation surface), and then the method of excavating the soil. In addition, when ...
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IPC IPC(8): E02D19/10
Inventor 沈水龙许烨霜张金辉高世轩马忠政蔡宽余周俊峰许锋朱继文
Owner SUNYOUNG CONSTR GROUP