A device for measuring water pressure and limiting drainage of the surrounding rock of a wellbore constructed by freezing method and its construction method

Abstract

The invention relates to the field of shaft detection equipment and particularly relates to a device for implementing shaft surrounding rock water pressure measurement and limited drainage by a freezing method and a construction method thereof. The device for implementing shaft surrounding rock water pressure measurement and limited drainage by the freezing method is characterized by comprising a water collection pipe embedded into the outer side of shaft wall surrounding rocks; the tail end of the water collection pipe is connected with a drainage pipe penetrating through the shaft wall surrounding rocks; the drainage pipe is connected with an elbow and then is connected with a four-way joint; the other three ends of the four-way joint are respectively connected with a water pressure meter, a water pressure alarm device and an automatic drainage valve. Therefore, the device is reasonable in design, practical and convenient.

Description

(1) Technical field [0001] The invention relates to the field of wellbore detection equipment, in particular to a water pressure measurement and limited drainage device and a construction method for the surrounding rock of a wellbore constructed by freezing method. (2) Background technology [0002] In recent years, in the process of coal mining, mine construction conditions have become worse and worse, and the main problems faced are poor self-supporting capacity of surrounding rock and water leakage of shaft. The freezing method can effectively waterproof and improve the stability of the surrounding rock, and has become one of the most effective shaft special construction methods for crossing unstable thick topsoil layers, broken rock layers, and soft rock layers, and has been widely used. However, the freezing method cannot relieve the effect of the water pressure in the surrounding rock of the wellbore for a long time. After the frozen wall is thawed, the original water ...

AI Technical Summary

Problems solved by technology

However, the freezing method cannot relieve the effect of water pressure in the surrounding rock of the wellbore for a long time. After the frozen wall is thawed, the original water pressure will inevitably act on the wall of the wellbore.

Moreover, due to the penetrating effect of the frozen pipe and the frost heaving and thawing effect of the soil, the structure of the original surrounding rock aquifer has been changed. Embedded parts and other weak parts inrush water; on the other hand, the position of the aquifer is unpredictable. During the application of subsequent reinforcement measures such as segmental grouting and waterproofing, the selection of reinforcement positions is blind, and segmental reinforcement often fails to achieve the expected water blocking effect.

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