SU757713A1 - Method of excavating crumbling rock - Google Patents

Description

The invention relates to underground construction, in particular to the excavation of workings in fractured watered rocks.

Known methods of excavation workings with plugging of fractured rocks by injection into the cracks of cement materials [1]. ^five

However, these methods are not sufficiently effective when penetrating watered rocks and do not provide a reliable reduction of water inflows in the passable workings.

There is a method of plugging rocks with a complex method using alumina-cement solutions [2].

However, this method does not allow tamponing of cracks with a size of less than 0.1 mm due to the presence of coarse cement particles in the solution. Mud without cement additive capable of penetrating into the crack size 0.02 mm, since the solutions can seep into the crack-opening larger than the size of solid phases _m is 2-3 times. The largest particles of mud solution 0.01 mm. Embedding rocks with a clay mortar without cementing leads to leaching.

2

clay from cracks larger than 0.1 mm. It is not possible to achieve the filling of cracks of all sizes through the same wells, since the first injection of cement mortar leads to the overlapping of the “mouths of all the cracks that have a message with the well, which does not allow to fill the small cracks with shale solution.

The purpose of the invention is to reduce water production in passable workings due to ensuring the filling of cracks with a size of more than 0.02 mm without the subsequent washing out of material with large cracks.

This is achieved by placing rows of wells along the production contour, and a cement slurry containing large particles of solid phases is pumped through the wells of one row; after hardening, the shear resistance is at least 50 kgf / cm ² , then the cement slurry containing small particles of solid phases.

The drawing shows the layout

wells in the plan around the trunk and spread757713

3

Neka cement materials but the cracks of rocks with the use of cement and clay solutions.

In the drawing, the following notation: the diameter of the trunk in the light; diameter of cement wells; borehole diameter for feeding the mud;

1 'is the radius of the spread of cement from a single well;

P _GL - the radius of the spread · mud from a single well;

Sc - the distance between adjacent wells, intended for the injection of cement mortar;

With Gd - the distance between adjacent wells, intended for the injection of mud;

S. - distance between the nearest wellhead

us serving to inject dissimilar materials.

The values of Г ^ and ГРС should ensure the overlap of the grouting curtains of homogeneous grouting materials (2 Hz *> £ c and 2 Г _Г d> £ _Г д), and also plugging in the zones of the nearest wells transporting different grouting materials} (and, 7bcm II GGRSGG /

The technology of the method is as follows. All the wells are drilled. The cement slurry is injected through wells of a lesser radon and the injection is stopped after it appears in the next wells of another row, then the tamping wells are drilled, and the mud is injected through the wells of the next row before the next wells of the first row appear. Drilling wells is necessary to identify the moment of closing of the grouting curtains.

After the rocks have been plugged, the drilled wells are filled with one of the plugging materials used.

The distance between the circles of the location of the wells can be reduced to O,

then the wells transporting the mud will be between the wells transporting the cement slurry.

The proposed method of excavation workings in fractured rocks reduces water inflows in the passable workings, plugging a third of the size of more than 0.02 mm and eliminates washing out of the cement material from cracks larger than 0.1 mm in size for the life of the underground excavation, which improves working conditions of the drifts, improves safety and reduces the load on the lining - development.

Claims (1)

Claim The method of excavation of workings in fractured rocks, including the drilling of workings with several rows of wells and the injection of plugging materials through them, characterized in that, in order to reduce water inflows in the passable workings, rows of wells have a working contour and through wells of one row pump the cement slurry containing large solid phase particles having a shear resistance of at least 50 kgf / cm ² after hardening, then a cement slurry containing fine particles of solid is injected through the wells of another row hard phases