Dewatering treatment method for steeply inclined strip-shaped interbed composite stratum foundation pit

Abstract

The invention discloses a dewatering treatment method for a steeply inclined strip-shaped interbed composite stratum foundation pit. The dewatering treatment method is characterized in that an open-cut hall shallow pit is included, an open-cut hall deep pit is included, a station shallow pit is included, a deep shallow pit boundary is included, an end well deep pit area is included, a rail-crossing cable deepening area is included, a water collection pit is included, an underground diaphragm wall is included, inner limestone fracture grouting is carried out, wall bottom limestone fracture grouting is carried out, a pressure reduction well is included, a drainage well is included, a confined water observation well serving as an emergency recharge well is included, and a down-turning beam pit groove is included. The dewatering treatment method is particularly suitable for underground water treatment of the composite stratum foundation pit with upper old city miscellaneous fill, middle hard plastic clay and lower bed rock. It is summarized that the dewatering treatment method can achieve total closing, partial grouting, upper drainage, lower pressure reduction, bottom collection and drainage and external measurement and irrigation. The dewatering treatment method can reduce the number of dewatering wells and the water pumping amount, and the construction period and cost are saved;and meanwhile, the safety of the foundation pit and the surrounding environment can be guaranteed, and good economic and safety benefits are obtained.

Description

technical field [0001] The invention relates to the technical fields of construction engineering, urban rail transit, tunnels and underground engineering, in particular to a precipitation treatment method for foundation pits of steeply inclined strip-shaped interbedded bedrock composite strata. Background technique [0002] With the development of urbanization, there are more and more underground foundation pit projects, and the engineering and hydrogeology encountered are becoming more and more complex. The treatment of groundwater is very important to foundation pit engineering, and the successful treatment of groundwater is the prerequisite for the safety of foundation pit engineering. [0003] Composite strata often refer to the stratum with the upper part being the soil layer and the lower part being the rock layer. According to similar engineering surveys at home and abroad, the dewatering of foundation pits in such strata is often conservative in design, increasing th...

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Problems solved by technology

[0003] Composite strata often refer to the stratum with the upper part being the soil layer and the lower part being the rock layer. According to similar engineering surveys at home and abroad, the dewatering of foundation pits in such strata is often conservative in design, increasing the cost and prolonging the construction period; in addition, if there is an upper submerged and the lower part of the confined water, the reduction of the confined water may lead to changes in the upper diving and the surrounding environment, and even cause engineering and surrounding environment safety accidents

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