Deep foundation pit floury soil stratum deep-well well point rainfall construction method and application

A technology of well point dewatering and construction methods, applied in infrastructure engineering, construction, etc., can solve the problems of foundation pits that cannot be dug deep, construction obstacles, mud and quicksand, etc., to improve soil stability, prevent excessive settlement, The effect of preventing longitudinal landslide

CN110424430AInactive Publication Date: 2019-11-08XINJIANG COMM CONSTR GRP
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-11-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The embodiment of the invention provides a deep foundation pit floury soil stratum deep-well well point rainfall construction method and application, and relates to the field of traffic building and construction. The construction method comprises the steps of drilling a plurality of out-of-pit precipitation wells outside a foundation pit, and drilling a plurality of in-pit precipitation wells in the foundation pit; and lowering a plurality of well pipes to the corresponding out-of-pit precipitation wells and the corresponding in-pit precipitation wells to form corresponding in-pit well pipes and out-of-pit well pipes. By means of the deep foundation pit floury soil stratum deep-well well point rainfall construction method and the application, the out-of-pit precipitation wells and the in-pit precipitation wells are combined for precipitation, and the conditions that when light well points cannot meet the precipitation requirement, the number of the light well points are gradually increased, consequently the number of the well points is increased, and the excavation amount is increased are effectively avoided; and in-pit precipitation and out-of-pit precipitation are combined, the groundwater in soil within the foundation pit excavation scope is effectively drained, and construction work of construction machinery and workers in the pit are facilitated.
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Description

technical field

[0001] The invention relates to the field of traffic construction and construction, in particular to a construction method for dewatering a deep well point in a powdery soil layer of a deep foundation pit and an application thereof. Background technique

[0002] During the construction of the traffic road, if the geology of the silty clay stratum is encountered, due to its poor stability, in the excavation project of the deep foundation pit of the subway station, in order to dry the soil in the excavation range of the foundation pit Groundwater, as well as reducing the head height of the lower confined aquifer, ensure the stability of the foundation pit during construction. Traditional drainage methods can no longer meet the requirements of construction. If the dewatering construction cannot be done in time, there will be serious phenomenon of mud turning, mud and quicksand, which will not only make the foundation pit unable to dig deep, but also cause a larg...

Examples

Embodiment

[0062] The present application provides a construction method for deep well point dewatering in silty soil formations of deep foundation pits, which is especially suitable for silty clay formations.

[0063] This application specifically takes Pingchuan Road Station of Phase I Project of Urumqi Rail Transit Line 2 as a typical example for illustration. see figure 1 and figure 2 , The geology of Pingchuan Road Station of Urumqi Rail Transit Line 2 Phase I Project is mainly silty clay stratum with poor stability. According to the geological survey report, there are confined water and phreatic water in the stratum, and the distribution of aquifers is discontinuous. The diving is mainly buried in silt, with a gravel content of about 15%, and up to 20% locally. The roof is buried at a depth of 1.2-4m and a thickness of about 14-17m. The buried depth of the water level is 3-5m, the stable water level elevation is 854.6-856.1m, and the converted water inflow is 454.102m 3 / d, med...