Advanced monitoring method for ground subsidence of rock salt water-soluble mine
A ground subsidence and brine technology, applied in geophysical measurement, height/level measurement, measuring devices, etc., can solve problems such as long-term idleness, shallow well depth, and incomplete utilization of the main channel of a salt well, so as to achieve treatment avoidance and protection safe effect
Pending Publication Date: 2022-04-12
四川盐业地质钻井大队
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Problems solved by technology
In the actual mining process of the mine, although the hydrogeological observation wells are installed or the water wells in the mine are directly used as the hydrogeological observation wells, the depth of the wells is generally shallow, and the main monitoring of the changes in the hydrogeological characteristics of the shallow aquifer is not enough to detect the changes in the hydrogeological characteristics of the shallow aquifer in advance. The Bottom-up Progressive Impact of Cavity High Salt Brine Forecasting
On the other hand, the conventional disposal method for a large number of abandoned wells in brine mines is to leave them idle for a long time or seal all the wells, which has not fully utilized the value of a brine well as the main channel connecting the surface and deep strata.
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[0028] In view of the fact that the abandoned brine wells in the mined-out area are no longer used in the above-mentioned prior art, but a separate monitoring well needs to be excavated to monitor the geological conditions of the mined-out area, which not only requires a large amount of work, but also has a high cost. This embodiment is optimized to solve the problem. Problems in the prior art.
[0029] Specifically, such as figure 1 , figure 2 As shown, this embodiment provides a method for advanced monitoring of land subsidence in rock salt solution mines, including the following process:
[0030] S1: Select several abandoned brine wells as observation wells; in this embodiment, select three observation wells, numbered respectively as 001#, 002# and 003# observation wells.
[0031] S2: Conduct drilling and geophysical logging for each observation well, and determine the monitoring well section on each observation well, and seal the wellbore at the lower part of the monito...
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The invention relates to the technical field of mine geology monitoring, in particular to a rock salt water-soluble mine ground subsidence advanced monitoring method which comprises the following steps: selecting a bittern waste well as an observation well; drifting and geophysical logging are conducted on the observation well, a monitoring well section is determined in the observation well, and a well hole in the lower portion of the monitoring well section is blocked; cutting the technical casing in the monitoring well section, and removing the cement sheath through a wide hole, so that a shaft is communicated with an original stratum seepage channel; a shaft is cleaned, and well mouth waterproof sealing treatment is conducted on a well mouth; and arranging a hydrological monitoring instrument at the monitoring well section, and communicating the hydrological monitoring instrument with a ground data processing system. According to the method, the damage condition of the geological strata is monitored in real time through the abandoned well, and an alarm is given in time when the damage condition exists, so that treatment is facilitated to avoid pollution to the upper geology, the safety of the geology above the goaf is protected, and the geology, underground water and the like of a living area are prevented from being damaged.
Description
technical field [0001] The invention relates to the technical field of mine geological monitoring, in particular to an advanced monitoring method for ground subsidence in rock-salt soluble mines. Background technique [0002] During the mining process of brine mines, underground rock salt is dissolved by water to generate brine and return to the ground, forming a solution cavity filled with brine underground. With the progress of mining, the scope of the dissolved cavity is continuously expanded, and the roof rock of the dissolved cavity is continuously exposed, resulting in local stress concentration, and under the combined action of hydrodynamic forces, it is very easy to lose stability and collapse. In the roof management of mining activities, the impact range of the goaf on the overlying strata is divided from bottom to top into caving zones and fissure zones (if this trend develops to the surface, there may even be ground subsidence zones). Brine can easily infiltrate ...
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IPC IPC(8): G01C5/00G01V9/00E21B33/10E21B29/00E21B29/08E21B33/03
Inventor 王鹏黄东杰刘加杰唐巍刘晓博
Owner 四川盐业地质钻井大队