SU1346728A1 - Method of reducing negative friction forces - Google Patents

Abstract

The invention relates to the construction, in particular to the reduction of negative friction during the settling of the subsidence soil, at least under the action of its own weight during soaking, and is aimed at increasing efficiency. This is achieved by drilling in parallel located wells, forming a vertical slot, at an angle of 45 in the slot plane with a step equal to two bore diameters. 5 ill., 2 tab.

Description

The invention relates to the construction and, in particular, to the reduction of the forces of negative friction during the settling of the subsidence soil at least under its own weight during soaking.

The purpose of the invention is povpnenie efficiency,

Fig. 1 shows a diagram of the location of inclined wells around an array of pre-reinforced soil in Fig. 2 - section A-A in Fig. 1; Fig. 3 shows the layout of inclined and drainage-explosive wells at the site of strengthening of loess subsidence under its own weight during soaking; figure 4 - section bB in fig.Z; on fig.Z - section bb In fig. 3

A method for reducing negative friction is as follows.

The contour, for example, of a pre-hardened soil mass 1, by injecting a fixing solution or otherwise using an inclined auger drilling machine of the SBM-3 type, drills in unconsolidated soil 2 wells tilted at an angle of 45 ° and placed in parallel one another in a vertical plane with schagom equal to two borehole diameters 3.

In the case of a decrease in negative or around area 1, within

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Secondly, the sowing subsidence soil is hardened by soaking it (Fig. 3), before drilling wells 3, the neck 1 section 4 can be made along the contour. Inclined wells 3 are drilled from the bottom of the trench 4 to the full depth of the subsidence. In order to accelerate the soaking processes and subsequent sedimentation of the soil 1, vertical drainage wells 5 are drilled with filling them with coarse drainage material 6 after placement of charges 7 of the explosive.

When the soil is soaked 1 to the STATE or a fluid consistency and the subsequent initiation of the explosion of charges 7, the wetted subsiding soil 1 is deposited under its own surface.

at the same time, along the slit formed by the inclination of the wells 3, there is a cut of 8 practically without friction between the settling ground 1 and the remaining natural ground 2.

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The same cut 8 occurs in the case of precipitation of the soil 2 around or partially relative to the pre-reinforced soil 1 (Figures 1 and 2). At the same time, less friction between the soil massifs can be achieved with a smaller inclination angle of the wells 3, but this will require additional energy and time.

Example 1. On a plot composed of loess subsided soil of the P type, with a capacity of 12.4 m, two parallel walls of fixed soil 10 m long and 1 m wide were formed to a depth of 8 m. After the walls were formed at the border of the first wall to on the side standing front to the other wall, the loose ground was drilled to a wall depth by vertical wells with a diameter of 150 mm with equal pitch, the clearance between the wells was 80 mm. On Granin, adjoining the second wall to the loose ground, inclined wells were also drilled from the inner side at an angle of 45 with a diameter of 150 mm with an equal pitch equal to 300 mm. Four drainage wells to a depth of 6 m were drilled inside the area formed between the two walls, through which the estimated amount of water was fed into the soil mass to bring subsurface loess soil between the walls to a fluid consistency. To accelerate the process of subsidence of the wetted soil on the surface of the latter, heavy w / concrete blocks and plts were installed. After 6.5 months after the lock, a study of this area was carried out.

The research results are summarized in table. one .

As can be seen from the table above, according to the proposed method, the amount of precipitation of the wetted area adjacent to the wall is almost the same as in the middle of the section, while by a known method the overhanging soil on the fixed ground (wall) is observed. Dug shchurfy at each of the walls to the full depth of consolidation, showed that when the slot made by the proposed method, proizopsha complete cutting of subsiding soil in contact with a fixed section of the crack, and roll in 13346728

fortified soil (wall). Not observed. When norerezke made by a known method, full cutting was observed, only to a depth of 5.2-5.7 m. Oblique and horizontal cracks up to 0.5 cm wide were observed in fixed soil (wall), starting from 3.8 meters depth. Also marked

roll the top of the wall towards the sagging array with a mix of 4-7 cm.

Example 2. Four test sites, 6 m long and wide in m, were selected on a plot of 14.5 m loess of subsidence P type with a thickness of 14.5 m. Two of them were compacted. According to a known method, contour trenches 0 , 25 and 5 m deep. From the bottom of the contour trenches, vertical wells with a diameter of 150 mm were drilled with equal pitch and a gap between them equal to 80 mm. The bursts of 5 kg (ammonite tf 6) stirred at a depth of 10 m in the drainage-spring squashes formed in the squares nodes grids with a pitch of 2 m. On the other two ploshad, the compaction was carried out according to the proposed method, i.e. instead of vertical, as close as possible wells, wells of 150 mm in diameter inclined at an angle of 45 mm were drilled with a clearance between the wells equal to the diameter of the wells. As a result of such drilling in the vertical planes passing along the contour lines of the compacted area from the bottom of the contour lines to the end of the subsidence, cavities were formed.

All four areas were soaked to a flowing consistency through drainage well wells by supplying a calculated amount of water.

After that, deep explosions were carried out. At each site, explosions were carried out with a time interval of 5 seconds, with two explosions simultaneously in adjacent wells. Over a period of 3.5 months, consolidation of the sealed areas was observed.

In tab. 2 shows the results of comparative studies.

The results show that according to the proposed method, the degree of soil compaction is higher and the drawdown

runs more evenly than the known.

According to the proposed method, a full drawdown along the slit occurred, and in the areas compacted by the known method, the full cutting was only up to a depth of 6.2-6.5 m from the bottom of the contour trenches, while oblique cracks were observed, going as inside the section , and in the direction of the adjacent array.

Claims (1)

Invention Formula A method of reducing negative friction forces, mainly when a subsidence soil sinks at least under its own weight when soaking, including the formation of vertical cuts to the depth of the subsidence layer by drilling parallel wells with a step equal to two bore diameters, different in that , wells are drilled at an angle of 45 in the slot plane, i T a b l i c a 1 Slot type The amount of precipitation of loose soil along the slot line after 6.5 months, cm The difference between the draft of the middle of the wetted area and the surfaces of the same area adjacent to the walls, cm Slot formed by vertical wells 26 Slit formed by inclined wells40 sixteen compacted Maximum surface sediment, cm, after 3.5 months 65, 5 8.6-9.5 70, 6 7.8-12.8 82.4 0.6-2.2 84.8 0.4-1.9 The difference in precipitation is averaged over the surfaces of the area being compacted with its edges, cm 45 ° S / L / about About About About About About oh oh oh oh q oh oh About About About About About about oh ohhhh ABOUT five oh oh t-gg7t ttt 5 5 in oh :) J 4f .J five oh oh oh oh t It Q 6 5 5  Fi9.5 Editor A. Shandor Compiled by M. Hasin Tehred A. Kravchuk Proofreader M. Sharoshi Order 5102/29 Circulation 606 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab, 4/5 Production and printing company, Uzhgorod, st. Design, And