Groundwater observation well pipe and observation method for geotechnical investigation and surveying

Abstract

The invention provides a groundwater observation well pipe and an observation method for geotechnical investigation and surveying. The groundwater observation well pipe comprises an observation well hole, a telescopic well pipe, and telescopic push rods placed in the telescopic well pipe, wherein the telescopic well pipe comprises an outer layer solid wall pipe body and one or two or more telescopic perforated pipes in mutual sleeving connection; the end of the most outer layer telescopic rod of each telescopic push rod is connected with the most inner layer telescopic perforated pipe; the length of the outer layer solid wall pipe is greater than or equal to the distance between the openings of the observation well hole and the top surface of a water containing layer to be tested; and after the telescopic well pipe is mounted in the observation well hole, a rotary switching sealing ring is arranged outside the outer layer solid wall pipe body in a sleeving manner to realize sealing ofthe outer wall of the well pipe above the water containing layer to be tested and the hole wall of the observation well hole, and after the groundwater water level in the holes is stable, observationof the water level can be performed. Clay balls do not need to be backfilled, observation accuracy can be guaranteed, primary pipe sinking in place can be realized, the problem that the well pipe is mounted to cause subsidence of the hole wall can be solved, and the groundwater level can be observed in a layering manner.

Description

technical field [0001] The invention relates to the technical field of engineering geology and hydrogeological survey, in particular to a simple and effective groundwater observation well pipe and observation method for engineering survey. [0002] technical background [0003] In the process of engineering geology and hydrogeological investigation, it is very important to conduct water level observation and long-term monitoring of groundwater on the site. It involves dynamic evaluation of groundwater and anti-floating of foundation pits, which are important aspects of engineering construction. Site Groundwater sometimes has types such as upper stagnant water, phreatic water, and confined water, all of which require special observation holes for observation during surveying. [0004] The existing conventional groundwater observation method is to use a geological drilling rig to form a hole, then install and manufacture the well pipe, install the well pipe joint by joint, back...

AI Technical Summary

Problems solved by technology

In the existing observation method, the well pipe is installed joint by joint, and it is necessary to repeatedly align the joints, which is easy to collapse the hole. Since the side wall of the well pipe needs to be backfilled with filter material and clay balls, the clay particles are easy to adhere to the filter pipe of the well pipe and block the well. tubes, resulting in distortion of the water level observation results, so it needs to be cleaned and cleaned several times; and the existing measurement methods are relatively rough for different groundwater separation methods, which will also lead to the observed water level distortion

In addition, the existing observation methods can only observe the water level of one aquifer. When there are two aquifers in the site and need to observe the groundwater level, two sets of observation wells need to be built, and the project cost is relatively high.

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