SU927897A1 - Method of thermal consolidation of soil - Google Patents

Description

one

The invention relates to the strengthening of a subsurface soil in the construction of buildings and structures, in particular, to the strengthening of the soil by thermal action and can be used to erect underground structures.

A known method of thermally strengthening the soil includes drilling a number of wells, sealing them, burning burnable mixtures in the wells, injecting hot gases into the soil and introducing filler 1 into the wells.

Closest to the proposed. is a method of thermally strengthening the soil, including drilling a number of horizontal wells, sealing them, supplying combustible mixtures to the wells, burning them, injecting hot gases into the soil, reinforcing the walls of the wells and introducing the G21 aggregate into them.

The disadvantage of these methods is that they are calculated

ONLY on equal strength reinforcement of the soil massif and do not ensure the creation of a monolithic lining from the soil in the form of a closed contour of the horizontal tunneling development, laid in the slope, and this significantly limits the technical possibilities of thermal soil reinforcement.

The purpose of the invention is to provide a monolithic lining of horizontal excavation from the ground.

The goal is achieved in that according to the method, including drilling a number of horizontal wells, sealing them, supplying combustible mixtures to wells, burning them, injecting hot gases into the Soil, reinforcing the walls of the wells and introducing a filler into them they are formed; they are formed in staggered directional grooves. Injection of hot gases into the soil is carried out simultaneously in all wells of the circuit, drainage material is used as a filler of the lower wells of the circuit, and the drilling of the wells of the circuit is performed at a distance between their centers, determined from the ratio, h f-oTW S where b well bore radius, m, well depth, m, minimum contour wall thickness, m, fortified reinforcement rate coefficient,, t - JP - fortify duration. FIG. 1 shows schematically horizontal wells placed in a slope, a longitudinal section in FIG. Of a well, and underground production, a transverse section. . The process technology is as follows. At the beginning, horizontal wells 1 are drilled from the outer side of the closed contour of the underground excavation 2 at a distance determined from relation (1). The bottom wells 3, if necessary, are drilled with a slope to provide drainage, and in the side walls of the excavation 2, vertical upward recesses k are formed in a staggered pattern. After this well 1 and 3, they are sealed with jets 5 and fed into them. They burn them, and the hot gases are injected into the reinforced soil 6 until the design rate, for example, 600–900 ° C, reaches its outer contour. 7 After that, the horizontal wells 1 are reinforced and filled with hardening mortar or concrete, and the lower wells 3 fill others niruyuschim material. Then, the unfortified soil 8 is removed from the excavation 2, and its inner surface 9 is aligned with the layer of the soil 10 heated to BOO-ZOO C and is covered, for example, with spray concrete on the grid 11. In those cases, when the side walls. The wells and overlaps of production 2 are loaded slightly, the combustion of combustible mixtures in wells 1 and 3 is carried out in stages, through one well, and reinforcement of 12 wells 1 is not performed. Drilling of wells 1 and 3 at a predetermined distance from each other makes it possible to obtain a reinforced array of one THOUSAND, and the burning of combustible mixtures in each well 1 and 3 speeds up the burning process. Alignment of the inner surface of the layer heated before is carried out in the case when the fortified soil is not directly subjected to multiple freezing-thawing, but if such freezing and subsequent thawing during operation of the structure is not excluded, the soil on the surface must be burned at temperature В The boreholes 1 forming the side walls of the excavation 2 perform depressions C for intensifying the process of strengthening the soil by reducing the technological losses in the horizontal direction. For example, in the work area, thermal ground reinforcement is carried out in an underground mine 2, located on a slope - folded from top loam. - Production perimeter 2 in a cross section of 23 m, length 8 m. Burr 16 wells 1 and 3 with a diameter of 0 , 2 m machine P8VS-15 with a horizontal prefix. The distance between the wells is 1.4 m. The lower three wells 3 are made with a slope outward, and in six wells 1, vertical cteHb production 2 is formed with the help of a depressing device, vertical recesses k with a height of 0.15 m are made. 3 cm in diameter. In wells 1 and 3, combustible mixtures of liquid fuel are burned with calorific value k2 m J / kg and compressed air supplied under a pressure of 0.06-0.1 MPa from the Mill-55 compressor. The maintenance of the valves with nozzles 5 and the monitoring of the combustion mode in wells 1 and 3 are carried out by operators from mobile platforms of portal type. Firing lasts 123 hours. After this, wells 1 are concrete-cast using a C-296 concrete pump with brand 100 concrete, and wells 3 are filled with gravel. Then, the soil from the inner part of the excavation 2 is removed, and the inner surface 9 is leveled along the firing temperature contour of 600 ° C, and a layer of concrete is applied to it using a cement gun C-320. To compare the consumption of air, fuel, and the cost of the ground, which is hardened to 927,897, equal temperatures of the ground are simultaneously carried out by firing the retaining wall in the ground in a manner known per se. The test results are shown in the table.

Consumption of energy resources per 1 m fortified soil

The application of the proposed method in practice will allow to reduce the energy consumption of compressed air by 1.58 times, the fuel - by 1.26 times and by one time to reduce the cost of roasting by 9

The method of thermal strengthening of the soil, mainly in the form of a closed-loop 30 on the slope, including storms of horizontal wells, their sealing, supplying combustible mixtures to the wells, burning, forcing hot gases into the soil, reinforcing the walls of the wells and introducing in them, a filler, characterized in that, in order to ensure the creation of a monolithic lining of the horizontal development from the ground, after drilling the side walls of the contour wells, they are formed in staggered order p recesses injecting hot gases into the ground lead odn1Evremenno all wells loop, as the core of the lower wells circuit applied draining material and drilling wells circuit produced on a distance between their centers is determined from the ratio emom

(i-iN)

- well radius, m

where is go

- well depth, m,

L b

- the minimum thickness of the contour walls, m,

CL

experimental coefficient of speed of strengthening, m / h,

t duration of soil reinforcement, hours. Sources of information taken into account in the examination

1. USSR author's certificate number 53809, cl. E 02 D C / N, IS.

2. USSR author's certificate on application ff 2821697 / 29-33,

cl. E 02 D 3/10, 1979.

Claims (2)

Claim A method of thermal strengthening of the soil, mainly in the form of a closed 30th circuit on the slope, including drilling a number of horizontal wells, sealing them, supplying combustible mixtures to the wells, ir burning, injecting hot gases into the soil, reinforcing the walls of the wells and introducing them into them aggregate, characterized in that, in order to ensure the creation of a monolithic lining of the horizontal-> Zonal development from the soil, after drilling ₄₀ wells of the side walls of the circuit, staggered px of recesses, injection of hot gases into the soil is carried out simultaneously in all wells of the circuit, drainage material is used as a filler for the lower wells of the circuit, and drilling of the circuit wells is carried out at a distance between their centers, determined from the ratio where r _Q - well radius, m b L - well depth, m, b - minimum thickness ste- a. loop foot, m - experimental coefficient soon ty of strengthening, m ^g / h, g - the duration of soil strengthening, h Sources of information, taken into account during the examination 1. USSR copyright certificate N · 538094, cl. E 02 D 3/14, 1974. 2. USSR author's certificate on application N * 2821b97 / 29 “33, cl. E 02 D S / W, 1979927897 Order 3186/39 Circulation 711 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., 4/5, PPP branch Patent, Uzhhorod, st. Project, 4