Construction method for carrying out pressure reduction water control treatment when confined groundwater bursting happens to deep foundation pit

Abstract

The invention relates to the technical field of deep foundation pit construction, in particular to a construction method for carrying out pressure reduction water control treatment when confined groundwater bursting happens to a deep foundation pit. The method comprises the following steps that S1, well hole drilling is carried out and well drilling is carried out at the bursting position of the deep foundation pit; S2, a filter material bag is put in a hole, and the filter material bag is put into the well hole for bottom pressing; S3, a well tube is manufactured and hoisted, and the well tube is overall hoisted into the well hole; S4, the space between the hole well and the well wall is filled with materials; S5, a filter material bag is put into the well tube, water is drawn, the filtermaterial bag is put into the bottom of the well tube, then an immersible pump is lowered, and confined underground water in the well tube is drawn out; and S6, well sealing is carried out, the well hole is sealed, and foundation soil is subjected to grouting filling reinforcement treatment. The method has the following effects that the confined groundwater is temporarily stored in the well hole,the confined groundwater at the bursting point is controlled, after the confined groundwater is constantly drawn out, the well hole is closed, and therefore the confined groundwater bursting quantityunder the conditions of the high pressure and the large water quantity is reduced, and the water control effect is improved.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit construction, in particular to a construction method for reducing pressure and controlling water when a deep foundation pit encounters a surge of pressurized water. Background technique [0002] In deep foundation pit engineering, due to the large excavation depth and wide range of deep foundation pits, the probability of inrush of confined water at the bottom is relatively high. When the self-weight pressure of the impermeable soil layer below the bottom of the deep foundation pit is less than the pressure of the confined water below, it will cause uplift and damage of the bottom soil of the deep foundation pit, and water spray and sand gushing will occur at the same time; or when the geological exploration hole is not effectively blocked , after the excavation of the deep foundation pit, under the action of the head pressure, the confined water will carry a large amount of mud and sa...

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned existing technical solutions have the following defects: the confining water inrush in deep foundation pits is often the situation of high pressure and large water volume. In some cases, when the construction personnel inject cement slurry into the geotechnical mold bag and wait for the cement slurry to solidify, the piping can be blocked. At this time, a large amount of pressurized water has already gushed out, and the water control treatment effect is poor.

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