SU897942A1 - Method of providing counter-filtration screen in incoherent soils - Google Patents

Description

The invention relates to the protection of the foundations of buildings and structures from groundwater, in particular by the formation of an anti-filter screen in incoherent soils.

A known method of creating an anti-filter screen, including the formation of a narrow gap and filling it with waterproof material [1].

The disadvantages of this method is the high complexity of the work on the formation of a gap and the significant cost of a waterproof material, which reduces its effectiveness.

The closest to the invention of the known method is the formation of impervious screen in cohesionless soil, comprising drilling vertical wells using a slurry, injecting into the soil through a wellbore and the mud filled wells vo ¹ donepronitsaemym material [2].

The disadvantage of this method is the necessity of drilling large diameter holes using sophisticated equipment and a large number ^s of waterproof material, which increases the cost and lowers the work efficiency.

The purpose of the invention - increase about ¹⁰ productivity and reducing the cost of operations.

This goal is achieved by the fact that in a method that includes drilling ¹⁵ rows of vertical wells with the introduction of a clay solution into them, injecting a clay solution into the soil and filling the wells with waterproof material, before filling the wells ²⁰ with waterproof material, elongated explosive charges are placed in the wells. after which they produce a one-time temporary explosion, and the distance between the wells is determined from the ratio! ^а = 0Д ~~ 2д _{М <} (1) where Р - linear charge density, kg / m, h - screen thickness, dm; Pr - an indicator of permeable soil, d / ^ / kg.

In FIG. 1 - section along the axis of the well at the time of lowering the elongated explosive charge; in FIG. 2 - body of the impervious wall, cross section.

The proposed method is as follows.

A series of vertical wells 4 are drilled along the axis of the constructed screen 1 to the water stop 2 using clay mud 3 and are drilled at a distance of 1-1.5 m from each other, with a diameter of 100-200 mm using a rotary drilling rig.

During drilling around each well 4, a claying zone 5 of soil 6 is formed, which does not provide the necessary stability of the massif, especially on incoherent low-permeable soils (fine-grained sand, sandy loam), while the penetration depth of solution 3 is less than 0.5 m. As a result, after drilling Gin 4 injects clay mud into the soil using a piston pump, which ensures the temporary stability of the array. Then elongated charges 7 of explosive are lowered into the wells 4 to the entire depth of the wells, which can be used ammonite 6 LH.

The amount of explosive or the distance between the wells is determined according to the given ratio (1).

For example, to form a wall thickness of 0.5 m in sandy loam whose exponent Pr = prostrelivaemosti "dm ^ 200 kg, with a distance of 1 m between wells required linear charge density equals p _x 40 & J 40 * YB 5_ 5 _m g kg / mt ^g P _r .200

All charges 7 explode simultaneously ** but, as a result of which they produce

897942 4 additional compaction of the clay soil 8 and form through the bottom) density 9. Then the cavity is filled with a waterproof material 10, _5, for example, clay-cement mortar.

The application of the proposed method allows to reduce by 2-3 times the flow rate ^ for drilling wells due to the possibility of increasing the distance between 10 wells, reducing the flow rate of the mud and reducing the diameter of the wells, as well as using more productive rotary drilling machines and thereby increase 15 productivity and reduce approximately 1.5 times the cost of work.

Claims (2)

temporary explosion, and the distance between the wells is determined from the relation where P is the linear density of the charge, the screen thickness, dm, the sweep rate of the soil,. FIG. 1 is a section along the axis of the well at the time of the lowering of the elongated explosive charge in FIG. 2; the body of the impervious wall is transversely divided. The proposed method proceeds with the following. Along the axis of the constructed screen I to the water column 2 using the mud solution 3, the drill is drilled vertically at a distance of 1–1.5 meters from each other, with a diameter of 100–200 mm using a rotary drilling rig. During the drilling process, a clay zone 5 of soil 6 is formed around the borehole k, which does not provide the necessary stability of the mass, especially on non-connected low-permeable soils (fine-grained sand, sandy loam), and the penetration depth of solution 3 is less than 0.5 m. As a result after drilling the wells, k is injected into the soil of the mud using a piston pump, which ensures the temporal stability of the array. Then, in the wells 4, elongated charges of explosive 7 are lowered to the full depth of the wells, in which ammonite 6 LH can be used. The amount of explosive or the distance between the wells is determined according to the above relation (1). For example, to form a wall with a thickness of 0.5 m in sandy loam, the sweep rate of which is PP 200, with a distance between wells of 1 m, a linear charge density is equal to Го а -fo X Fo / 5 g, 6 hg / All charges 7 explode simultaneously, as a result of which 4 additional compaction of the clay soil 8 is produced and forms a through density of 9. Then the cavity is filled with a waterproof material 10, for example, with a clay-cement solution. The application of the proposed method allows reducing the drilling costs by 2-3 times due to the possibility of increasing the distance of the well borehole, reducing the mud flow and reducing the diameter of the wells, as well as using more efficient rotary drilling machines and thereby increasing productivity and reducing the example of 1.5 times the cost of work. Claims of Invention A method of forming an anti-filtration screen in non-contact soils, including drilling a number of vertical wells with the introduction of mud, injecting mud into the soil through the wells, and filling the wells with DOD6N1 (well, which is supposed to increase performance and lowering the cost of work, before filling the wells with a waterproof material, the elongated explosive charges are placed in the wells, after which they are made belt explosion, and the distance between the wells is determined from the ratio: C i-d a and one where P is the linear density of the charge, kg / m, screen thickness, dm} the sweep rate of the soil,. during examination 1. USSR author's certificate for application No. 2793618 / 29-33, class E 02 D 3/12, 1979. 2. Meshcher A.I. and Kheifets V.B. Anti-seepage and bearing walls in the ground. M., Energie, 1969, p. 35-3.7.