CN112627163A - Soft soil foundation reinforcing method for accelerating drainage by blasting - Google Patents
Soft soil foundation reinforcing method for accelerating drainage by blasting Download PDFInfo
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- CN112627163A CN112627163A CN202011299211.1A CN202011299211A CN112627163A CN 112627163 A CN112627163 A CN 112627163A CN 202011299211 A CN202011299211 A CN 202011299211A CN 112627163 A CN112627163 A CN 112627163A
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- explosion
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- soft soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
Abstract
The invention provides a soft soil foundation reinforcing method for accelerating drainage by blasting. The method comprises the steps of covering 1-2 m of backfilled sandy soil on the ground surface of an area to be reinforced, arranging a transverse drainage plate and a vertical drainage plate, arranging a plurality of explosion holes between a drainage ditch and the drainage plate, vertically drilling each explosion hole below a soft soil layer from the ground by using a drilling machine, installing a linear explosive bag in each explosion hole, dividing all the explosion holes into two times of detonating, extruding most of the sandy soil filled in each explosion hole into the surrounding soil body under the action of explosive force after each explosion, forming a vertical strip-shaped explosion cavity, filling sandy soil or gravel soil into a cavity to form a vertical drainage channel, and after the drainage of the ground surface is finished, performing surface dynamic compaction on the area to be reinforced to reinforce shallow foundation soil to finish the reinforcement of the foundation. The invention effectively improves the transverse permeability of the soil body and quickly reduces the water content of the soft soil, thereby reinforcing the soft soil, and having high reinforcing speed, good effect and low cost.
Description
Technical Field
The invention relates to the field of foundation treatment, in particular to a soft soil foundation reinforcing method for accelerating drainage by utilizing blasting.
Background
With the development of human engineering construction, there are a large number of weak foundation soils to be treated. The existing foundation treatment technologies are various in types and mainly comprise methods such as a pad layer replacement method, a drainage consolidation method, a dynamic compaction method, a lime-soil compaction pile method, a sand pile method, a gravel pile method, a lime pile method, a cement-soil stirring method, a rammed cement-soil pile method, a high-pressure jet grouting method, a cement fly ash gravel pile method, a reinforcement method, a grouting method, an explosion method and the like. The treatment method for large-area soft soil mainly focuses on a drainage consolidation method, and the traditional drainage consolidation method mainly adopts a ground surface loading mode, so that the treatment depth is limited, and the treatment time is long; the existing method for reinforcing foundation by explosion only can reduce the water content of soil and has slow effect on increasing the soil strength, because the method utilizes an explosion sand well (or a drainage plate) for drainage, forms super-static water pressure in the soil by utilizing the explosion force, and utilizes the drainage sand well (or the drainage plate) as a drainage channel for drainage and consolidation to reinforce the foundation soil.
Disclosure of Invention
The invention provides a soft soil foundation reinforcing method for accelerating drainage by blasting, aiming at the defects of the prior art, the method utilizes the blasting force to drive sand in holes into peripheral soft soil, improves the transverse permeability of the soft soil, discharges the excess pore water pressure by combining with a vertical drainage plate, and quickly and effectively reinforces the soft soil foundation by combining with the dynamic compaction of the ground.
In order to achieve the technical purpose, the invention provides a soft soil foundation reinforcing method for accelerating drainage by blasting, which is characterized by comprising the following steps of:
(1) determining the area of a region to be reinforced, covering 1-2 m of backfill sandy soil on the ground surface of the region to be reinforced according to site geological conditions, arranging a transverse drainage ditch in the region to be reinforced, inserting a vertical drainage plate, and penetrating a soft soil layer in the vertical direction of the drainage plate;
(2) arranging a plurality of explosion holes between the drainage ditch and the drainage plate, wherein each explosion hole is vertically drilled below the soft soil layer from the ground by a drilling machine, the diameter of each explosion hole is 110-130 mm, and the distance between every two adjacent explosion holes is controlled to be 5-7 m; installing a linear explosive charge in each explosion hole, wherein the explosive charge extends from the bottom of the explosion hole to an explosion hole opening, a detonating cord is arranged outside the explosion hole, and then filling sand around the linear explosive charge;
(3) all the blast holes are detonated twice, all the blast holes are numbered according to the explosion sequence before the detonation, and the two blast holes are arranged at intervals;
(4) detonating the linear explosives in the first blast holes by adopting a differential sectional blasting mode, extruding most of the sand filled in each blast hole into the surrounding soil body under the action of explosive force, and forming a plurality of vertical strip-shaped explosion cavities;
(5) filling sandy soil or gravel soil in the plurality of explosion cavities formed in the step (4) to form vertical drainage channels;
(6) repeating the steps (4) to (5) to finish the explosion and filling work of the second explosion hole;
(7) and after the surface drainage is finished, carrying out surface dynamic compaction on the area to be consolidated, fully compacting by using the compaction energy of 2000-3000 KN, consolidating shallow foundation soil, and finishing the consolidation of the soft soil foundation.
The further technical scheme of the invention is as follows: the diameter of the linear explosive in each explosion hole is 15-30 mm, the charging amount is controlled to be 0.4-0.5 Kg/m, the explosive is charged continuously from top to bottom, detonating cords are adopted to be connected in series, the detonating device is arranged on the ground, and the linear explosive detonated at the same time in each row of explosion holes are connected with each other through the detonating cords.
The invention has the following excellent technical scheme: and (3) filling sand into each blast hole in the step (2) to the hole opening.
The invention has the following excellent technical scheme: the inserting distance of the drainage plates is 2-3 m, and the drainage plates are distributed at equal intervals; the setting interval of escape canal is 25 ~ 50 m.
The invention has the following excellent technical scheme: the plurality of the explosion holes are arranged in a rectangular array, are numbered as I and II according to the explosion sequence, and are horizontally and vertically separated by one explosion hole which is numbered as II; and the same row of explosion holes with the same number are detonated simultaneously, and the detonation time interval of different row of explosion holes with the same number is 0.1 s-0.2 s.
The invention has the following excellent technical scheme: and (4) performing dynamic compaction on the surface layer in the step (7) by performing two times of detonating, and performing dynamic compaction and reinforcement on the surface layer 6-8 days after filling sand or gravels.
The invention uses the explosion pressure to drive the sand into the peripheral soft soil, forms more micropores in the horizontal direction of the soft soil, can effectively improve the horizontal permeability of the soil body, forms a horizontal drainage channel, improves the structure of the soil body, increases the permeability coefficient of the soil body, accelerates the drainage, and is inserted into the vertical drainage plate, the vibration force provided by the explosion forms ultrahigh hydrostatic pressure in the soil body, the ultrahigh pore water in the soil body can be quickly discharged along the horizontal and vertical drainage systems (drainage plates), the water content of the soft soil is reduced, and the soft soil can be reinforced. In addition, a stable explosion cavity can be formed by explosion, sand filling soil or gravel soil is backfilled, so that a vertical drainage body and a reinforcement body are formed, the compaction and drainage effects can be improved by the differential control sequential explosion, and the foundation soil reinforcement efficiency is improved. And after explosion, the problem of shallow layer reinforcement loosening can be solved by combining with ground dynamic compaction, and the reinforced foundation has the characteristics of good bearing capacity, unlimited reinforcement depth and the like.
The invention greatly improves the drainage effect by changing the transverse and longitudinal water permeability of the soil body, thereby effectively improving the treatment effect, in particular the treatment effect on deep foundation soil; the invention also combines the dynamic compaction technology, solves the problem of shallow layer reinforcement and looseness, and has good bearing capacity of the reinforced foundation. The invention has simple construction operation, safety and reliability, can greatly shorten the treatment time of the foundation, saves the engineering cost, has good application value and is particularly suitable for treating deep weak foundation soil.
Drawings
FIG. 1 is a schematic plan view of the present invention;
FIG. 2 is a schematic diagram of the distribution of the blastholes in the present invention;
FIG. 3 is a longitudinal cross-sectional view of the blast hole of the present invention after charging;
FIG. 4 is a schematic longitudinal cross-sectional view of an explosive cavity in accordance with the present invention;
fig. 5 is a schematic longitudinal cross-section of an explosive cavity of the present invention after backfilling.
In the figure: 1-blast hole, 2-drain bar, 3-drainage ditch, 4-sand filling, 5-linear explosive package, 6-blast cavity, 7-cavity returning gravel, 8-undisturbed soft soil, 9-soil improvement after blasting, 10-soil filling layer, and 11-detonating device.
Detailed Description
The invention is further illustrated by the following figures and examples. Fig. 1 to 5 are drawings of embodiments, which are drawn in a simplified manner and are only used for the purpose of clearly and concisely illustrating the embodiments of the present invention. The following claims presented in the drawings are specific to embodiments of the invention and are not intended to limit the scope of the claimed invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a soft soil foundation reinforcing method for accelerating drainage by blasting, which is used for reinforcing a soft soil layer in a certain construction area, and comprises the following reinforcing steps:
(1) the construction is started, sand and soil are firstly backfilled on the soft soil surface layer to form a 1.5m thick filling layer 10, broken stones can be backfilled at the positions of the explosion holes, then a transverse drainage ditch is arranged in a region to be reinforced, a vertical drainage plate is inserted, the insertion intervals of the drainage plates are 2-3 m and are distributed at equal intervals, the soft soil layer is penetrated in the vertical direction of the drainage plates, and the intervals of the drainage ditches are about 30m
(2) As shown in fig. 1, a plurality of explosion holes are arranged between the drainage ditch and the drainage plate, each explosion hole is vertically drilled below the soft soil layer from the ground by a drilling machine, the diameter of each explosion hole is 110-130 mm, and the distance between every two adjacent explosion holes is controlled to be 5-7 m; as shown in fig. 3, a linear explosive charge is installed in each explosion hole, the linear explosive charge extends from the bottom of the explosion hole to the opening of the explosion hole, the detonating cord is placed outside the explosion hole, and then the periphery of the linear explosive charge is filled with sand; the diameter of a linear explosive charge in each explosion hole is 10-40 mm, the charge amount is controlled to be 0.4-0.5 Kg/m, the charges are continuously charged from top to bottom, detonating cords are adopted to be connected in series, and the detonating device is arranged on the ground;
(3) after the construction of the blast holes is finished, the blast holes are distributed in a rectangular array, all the blast holes are detonated twice, before the detonation, as shown in figure 2, all the blast holes are numbered as a first blast hole and a second blast hole according to the detonation sequence, and the blast holes numbered as the first blast hole are separated by the blast holes numbered as a second blast hole in the transverse direction and the vertical direction; the same row of the explosion holes with the same number are connected to the same detonating device through detonating cords and are detonated simultaneously through the detonating device;
(4) detonating the linear explosives in the first blast hole by adopting a differential sectional blasting mode, wherein the detonation time interval of different rows of blast holes with the same number is 0.1 s; most of the sandy soil filled in each blast hole is extruded into the surrounding soil body under the action of the explosive force, so that the transverse permeability of the soil body can be effectively improved, a transverse drainage channel is formed, the soil body structure is improved, the permeability coefficient of the soil body is increased, and a plurality of vertical strip-shaped explosion cavities are formed, as shown in fig. 4;
(5) as shown in fig. 5, filling sandy soil or gravel soil in the plurality of explosion cavities formed in step (4) to form vertical drainage channels;
(6) repeating the steps (4) to (5) to finish the explosion and filling work of the second explosion hole;
(7) after the explosion is completed, high pore water pressure is formed in the soft soil, underground water can be discharged into a longitudinal drainage channel along a transverse drainage channel, then is discharged out of the earth surface and enters an earth surface sand layer, then is discharged away by a drainage ditch, and after 6-8 days of drainage, a region to be reinforced is subjected to surface dynamic compaction, the compaction energy is 2000-3000 KN full compaction, shallow layer foundation soil is reinforced, and the reinforcement of the soft soil foundation is completed.
The foundation treatment method of the invention utilizes the explosion pressure to drive the sandy soil into the peripheral soft soil, forms more micropores in the horizontal direction of the soft soil, effectively improves the horizontal permeability of the soil body, and forms a horizontal drainage channel; the shaking force that the explosion provided forms super high hydrostatic pressure in the soil body, and super high pore water in the soil body will be along horizontal and vertical drainage system (drain bar) quick discharge, reduces the weak soil moisture content to make the weak soil can consolidate. The filled sand in the blast hole is driven into the surrounding soil body under the action of the explosive force, the soil body structure is improved, the permeability coefficient of the soil body is increased, the water drainage is accelerated, in addition, a stable explosion cavity can be formed, and then the filled sand or gravel soil is backfilled, so that the vertical water drainage body and the reinforcement body are formed. The differential control sequence blasting can improve the compaction and drainage effects and improve the foundation soil reinforcing efficiency.
The above description is only a detailed description of specific embodiments of the present invention, and should not be taken as limiting the invention, and any modifications, equivalents, improvements, etc. made on the design concept of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A soft soil foundation reinforcing method for accelerating drainage by blasting is characterized by comprising the following steps:
(1) determining the area of a region to be reinforced, covering 1-2 m of backfill sandy soil on the ground surface of the region to be reinforced according to site geological conditions, arranging a transverse drainage ditch in the region to be reinforced, inserting a vertical drainage plate, and penetrating a soft soil layer in the vertical direction of the drainage plate;
(2) arranging a plurality of explosion holes between the drainage ditch and the drainage plate, wherein each explosion hole is vertically drilled below the soft soil layer from the ground by a drilling machine, the diameter of each explosion hole is 110-130 mm, and the distance between every two adjacent explosion holes is controlled to be 5-7 m; installing a linear explosive charge in each explosion hole, wherein the explosive charge extends from the bottom of the explosion hole to an explosion hole opening, a detonating cord is arranged outside the explosion hole, and then filling sand around the linear explosive charge;
(3) all the blast holes are detonated twice, all the blast holes are numbered according to the explosion sequence before the detonation, and the two blast holes are arranged at intervals;
(4) detonating the linear explosives in the first blast holes by adopting a differential sectional blasting mode, extruding most of the sand filled in each blast hole into the surrounding soil body under the action of explosive force, and forming a plurality of vertical strip-shaped explosion cavities;
(5) filling sandy soil or gravel soil in the plurality of explosion cavities formed in the step (4) to form vertical drainage channels;
(6) repeating the steps (4) to (5) to finish the explosion and filling work of the second explosion hole;
(7) and after the surface drainage is finished, carrying out surface dynamic compaction on the area to be consolidated, fully compacting by using the compaction energy of 2000-3000 KN, consolidating shallow foundation soil, and finishing the consolidation of the soft soil foundation.
2. A soft soil foundation reinforcing method using blasting to accelerate drainage according to claim 1, characterized in that: the diameter of the linear explosive in each explosion hole is 15-30 mm, the charging amount is controlled to be 0.4-0.5 Kg/m, the explosive is charged continuously from top to bottom, detonating cords are adopted to be connected in series, the detonating device is arranged on the ground, and the linear explosive detonated at the same time in each row of explosion holes are connected with each other through the detonating cords.
3. A soft soil foundation reinforcing method using blasting to accelerate drainage according to claim 1, characterized in that: and (3) filling sand into each blast hole in the step (2) to the hole opening.
4. A soft soil foundation reinforcing method using blasting to accelerate drainage according to claim 1, characterized in that: the inserting distance of the drainage plates is 2-3 m, and the drainage plates are distributed at equal intervals; the setting interval of escape canal is 25 ~ 50 m.
5. A soft soil foundation reinforcing method using blasting to accelerate drainage according to claim 1, characterized in that: the plurality of the explosion holes are arranged in a rectangular array, are numbered as I and II according to the explosion sequence, and are horizontally and vertically separated by one explosion hole which is numbered as II; and the same row of explosion holes with the same number are detonated simultaneously, and the detonation time interval of different row of explosion holes with the same number is 0.1 s-0.2 s.
6. A soft soil foundation reinforcing method using blasting to accelerate drainage according to claim 1, characterized in that: and (4) performing dynamic compaction on the surface layer in the step (7) by performing two times of detonating, and performing dynamic compaction and reinforcement on the surface layer 6-8 days after filling sand or gravels.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011299211.1A CN112627163A (en) | 2020-11-19 | 2020-11-19 | Soft soil foundation reinforcing method for accelerating drainage by blasting |
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| CN202011299211.1A CN112627163A (en) | 2020-11-19 | 2020-11-19 | Soft soil foundation reinforcing method for accelerating drainage by blasting |
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| CN112627163A true CN112627163A (en) | 2021-04-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375515A (en) * | 2021-07-21 | 2021-09-10 | 中国十五冶金建设集团有限公司 | Blasting compaction device and method for blasting compaction of soil slope by using same |
| CN115262651A (en) * | 2022-08-08 | 2022-11-01 | 上海建工集团股份有限公司 | Local self-collapsing water stopping method for underground continuous wall |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113375515A (en) * | 2021-07-21 | 2021-09-10 | 中国十五冶金建设集团有限公司 | Blasting compaction device and method for blasting compaction of soil slope by using same |
| CN113375515B (en) * | 2021-07-21 | 2023-01-17 | 中国十五冶金建设集团有限公司 | Blasting compaction device and method for blasting compaction of soil slope by using same |
| CN115262651A (en) * | 2022-08-08 | 2022-11-01 | 上海建工集团股份有限公司 | Local self-collapsing water stopping method for underground continuous wall |
| CN115262651B (en) * | 2022-08-08 | 2023-11-07 | 上海建工集团股份有限公司 | Underground diaphragm wall local self-collapsing type water stopping method |
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