Step water lowering method of phreatic water fully-penetrating well inclined shaft

Abstract

The invention discloses a step water lowering method of a phreatic water fully-penetrating well inclined shaft of an inclined shaft penetrating water-rich thick sand layer section. According to the method, the concept of water lowering units is introduced. Influence of interference between the water lowering units is considered. Inclined shaft water lowering wells are computed according to computing units successively. According to the character that water lowering depths are different at different well points during an inclined shaft building process, water lowering amounts needed by the water lower units are computed with the Darcy law and the Dupuit formula. By computing construction water lowering of a Xuemiaotan mine number two auxiliary inclined shaft, a computing result meets the construction requirement. The guiding significance in safe construction of the inclined shaft in a water-rich thick sand layer is achieved. The engineering geology conditions and the hydrogeological conditions of the Shaanxi North Yuandatan well field and the Dahaize well field and those of the Xuemiaotan mine are extremely similar, accordingly, the method can be used in building of inclined shafts of the Yuandatan well field and the Dahaize well field, powerful technical support and reference are provided for inclined shaft construction in the areas, application prospect is good, inclined shaft construction speed is increased, cost is saved, and the method is widely used for inclined shaft construction.

Description

technical field [0001] The invention relates to a dewatering method in the construction process of an inclined shaft in a coal mine. It is suitable for the estimation of precipitation in the construction process of inclined wells with gentle slopes, and guides the design of precipitation schemes. It is especially suitable for the stepped precipitation method of inclined wells in which the inclined wells pass through the water-rich thick sand layer. Background technique [0002] Existing dewatering wells are divided into complete wells and non-complete wells according to whether the bottom of the well reaches the impermeable layer; according to whether groundwater has pressure, dewatering wells are divided into pressure wells and submerged wells (no pressure wells). The corresponding dewatering theories include dewatering theory of pressure intact well, dewatering theory of pressure incomplete well, dewatering theory of submerged complete well, dewatering theory of submerged ...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for the existing precipitation theory that cannot scientifically and rationally calculate the precipitation during the construction of inclined wells, introduce the concept of precipitation unit, and calculate the precipitation of each unit according to the characteristics of different precipitation depths at different well points during the construction of inclined wells A Ladder Precipitation Method of Diving Complete Inclined Well with Required Precipitation Amount

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