SU1129372A1 - Method of plugging the base of a hydraulic structure - Google Patents

Description

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The invention relates to the construction of hydraulic structures, perceiving the pressure of water.

There is a known method of cementing the base of a hydraulic structure, which includes drilling wells and introducing through them into the rock cracks the plugging substance III,

The disadvantage of this method is the high consumption of cement,

In the foundations of hydraulic structures, the drainage works under conditions of pressure drops measured by tens and hundreds of meters. When groundwater moves in hydrocarbonate rocks, water is saturated with carbonate salts. It is known that hydrocarbonate waters change the degree of salinity depending on the pressure of gases contained in water, i.e. the content of carbonates in a certain volume of water corresponds to pressure,. which is experiencing this volume

Reducing the temperature of the groundwater when creating the reservoir also contributes to the solubility of gases. : Thus, moving under high pressure in the carbonate rocks of the base of structures, such as dams or tunnels, water is saturated with soluble carbonates. I. .

In and around drainage wells

their pressure drops sharply and the temperature rises. Under these conditions, drained waters become supersaturated carbonates that are deposited on the walls of drainage wells and in fractures in the rock near the wells. The most favorable conditions for the salting of salts and the calming of the BO of the secondary paths (cracks in the rock) are created in the zone of action of low-dwelling wells.

The fracturing of cracks leads to a decrease in the flow rate of drainage wells.

The whole invention is to reduce the costs of carrying out workings by plugging in a zone of rocks with salts of groundwater.

This goal is achieved by the fact that, according to the method of cementing the base of a hydraulic structure, including drilling wells and introducing a plugging substance into the cracks through the rocks, the first turn of the well is initially drilled until the complete plugging of the rock zone.

FIG. 1a shows an underground structure with drainage wells of the first stage; FIG. 15 - drainage wells of the first stage with a rock packed around them} in FIG. 2, drainage wells of the second stage, FIG. 2S is the same, with the rock packed around them in FIG. Over - drainage wells of the third stage, in FIG. ST - is the same, with a rock packed around them; in fig. 4 - an underground structure with a rock material packed around it.

The method of cementing the basement of an underground structure is as follows.

After the construction of the lining t of the underground structure, drainage wells 2 of the first stage are drilled from it (Fig. IQ) and monitor their production. When moving to the seepage water wells, around them there is a calcification (tamponage) of cracks 3 due to the precipitation of carbonate salts, and the flow rate of wells decreases. When a given reduction in flow rate is reached, new wells 4 of the second stage are located between the wells of the first stage.

After plugging of the rock around wells 4 of the second stage, wells of the third stage are drilled 5, they are located between the first and second wells. After some time, the tamping of the rock and around the wells of the third stage occurs, forming a continuous impervious screen 6 around the structures.

In the case of a large flow rate of wells that impede the precipitation of salts, the well is equipped with a tip with a valve and a manometer.

After the completion of the tamping of the rock around the structure of the drill t-shallow production wells 7, they were located within the limits of the dumped rock. When these wells are clogged, they are cleaned chemically.

The implementation of the described method of cementing the breed has the following advantages; under the action of the filtration flow, the process of tamponage (calmatization) continues over time

Claims (1)

METHOD FOR TAMPOGRAPHING OF A BASIS FOR HYDROTECHNICAL STRUCTURE, including drilling wells and introducing plugging substance into the rock cracks, characterized in that, in order to reduce the cost of cementing by plugging the rock zone with groundwater salts, the first stage wells are drilled first and after the cement plugging wells of the next stage are drilled in the rock, while these operations are repeated until the grouting of the zone is> ". 1129: