A construction method for spring protection and reinjection well in sandy pebble formation

Abstract

The invention discloses a construction method for a spring protection recharge well in a sand and gravel stratum. The construction method solves the problems that a traditional recharge well system in the sand and gravel stratum is low in recharge water amount, low in recharge water quality, limited in recharge range and low in spring protection efficiency, has the beneficial effects that the recharge water amount is large, the recharge water quality control is good and the recharge influence range is wide and can well play the functions of protecting underground water in spring regions and protecting the surrounding environment. According to the technical scheme, the method comprises the steps that the level and the buried depth of underground water on the position to be recharged, the soil stratum distribution and the physical and mechanical indexes of different soil stratums are measured, and a recharge seepage pit is excavated in the position to be recharged; oblique guide holes are drilled in the bottom of the recharge seepage pit, and steel piles are put into the oblique guide holes; and a pipe well is constructed on the center position of the recharge seepage pit, clear water sand filtering layers are correspondingly laid on the parts, located under the underground water, of the steel pipes and the pile well, and an oblique recharge well and a pipe well recharge well are formed.

Description

technical field [0001] The invention relates to the field of underground engineering, in particular to a construction method for a spring-preserving and reinjection well in a sandy pebble formation. Background technique [0002] At present, in strata with good water richness and large water inflow, in order to ensure the construction safety of foundation pit engineering, generally speaking, engineering measures such as foundation pit dewatering are required. In the area of ​​the spring groundwater system, because the hydrogeological unit is relatively closed, when the foundation pit dewatering engineering measures are adopted in the underground engineering construction, the large precipitation will affect the groundwater seepage environment around the foundation pit, causing geological disasters such as surface subsidence, and at the same time It will affect the supply of spring water, and in severe cases, it will cause the spring water to stop flowing, especially for the Ji...

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Problems solved by technology

[0006] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a construction method for spring-preserving and reinjection wells in sandy pebble formations, which overcomes the small amount of reinjection water in sandy pebble formations, the low quality of reinjection water, and the limited scope of reinjection in traditional reinjection well systems. The shortcomings of limited and low spring preservation efficiency, which have the following advantages: reduce the impact of foundation pit precipitation on the groundwater in the spring area, and achieve the effect of protecting the surrounding groundwater environment

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