CN114108596A - Rapid consolidation treatment method for sludge soft foundation - Google Patents
Rapid consolidation treatment method for sludge soft foundation Download PDFInfo
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- CN114108596A CN114108596A CN202010893073.3A CN202010893073A CN114108596A CN 114108596 A CN114108596 A CN 114108596A CN 202010893073 A CN202010893073 A CN 202010893073A CN 114108596 A CN114108596 A CN 114108596A
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- blasting
- soft foundation
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- interval time
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- 238000007596 consolidation process Methods 0.000 title claims abstract description 27
- 239000010802 sludge Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000005422 blasting Methods 0.000 claims abstract description 78
- 238000003672 processing method Methods 0.000 claims abstract description 7
- 238000004062 sedimentation Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 13
- 238000005474 detonation Methods 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 6
- 230000000694 effects Effects 0.000 description 18
- 238000004880 explosion Methods 0.000 description 12
- 239000002689 soil Substances 0.000 description 10
- 238000006073 displacement reaction Methods 0.000 description 7
- 230000003068 static effect Effects 0.000 description 6
- 230000000977 initiatory effect Effects 0.000 description 5
- 239000004576 sand Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000004746 geotextile Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000002045 lasting effect Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004904 shortening Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
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Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0085—Geotextiles
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2450/00—Gaskets
- E02D2450/10—Membranes
- E02D2450/101—Membranes permeable
- E02D2450/102—Membranes permeable for liquids
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a rapid consolidation processing method for a sludge soft foundation, which comprises the following steps: a1, burying blasting tube: embedding a hollow blasting tube in the soft foundation; b2, multiple blasting: multiple blasts are carried out in the blast pipe according to the same blasting interval time. The invention has the advantages that: can greatly shorten the drainage consolidation time, save the construction period, have controllable process, do not fly mud, do not have deep-fried pits, easy operation.
Description
Technical Field
The invention relates to the technical field of soft soil foundation treatment
Background
The soft soil in coastal beach areas of China is widely distributed, the engineering property is poor, the buried depth is thick and generally exceeds 20 meters, and the soil matrix has the characteristics of high water content, low shear strength, poor bearing capacity, small permeability, high compressibility, large porosity ratio and the like. The traditional soft soil foundation treatment method comprises vacuum preloading, surcharge preloading, vacuum combined surcharge preloading and the like, the drainage consolidation time is usually more than half a year, and the defect of overlong construction period exists.
In order to accelerate the consolidation of soft soil foundation, a rapid method of performing foundation treatment by combined cycle blasting based on preloading has also been proposed, and refer to fig. 1. For the selection of the cyclic initiation time, a method of performing cyclic blasting at an interval of 2-15 days after primary initiation is adopted, and a method of performing next initiation when the hyperstatic pore water pressure dissipation caused by one-time blasting is up to more than 80% is proposed. However, in all of these methods, the initiation effects at different sites are not consistent, and the effects are not ideal.
Disclosure of Invention
The invention aims to provide a rapid consolidation processing method for a sludge soft foundation, which can greatly shorten the drainage consolidation time, save the construction period and realize controllable and predictable detonation effect.
The technical solution of the invention is as follows: a rapid consolidation treatment method for sludge soft foundation comprises the following steps: a1, burying blasting tube: embedding a hollow blasting tube in the soft foundation; b2, multiple blasting: multiple blasts are carried out in the blast pipe according to the same blasting interval time.
Carry out a lot of blasting in the blast pipe, can not fly mud, also do not have the blast pit, the settlement of ground when the drainage is even, carry out a lot of blasting according to the same blasting interval time, both can shorten the time of whole construction, also can ensure the effect of blasting drainage at every turn, under the circumstances that total displacement is confirmed, the time of the processing of can very big shortening consolidation.
Step B1 of determining the time between blasts is also included before step B2: and monitoring the sedimentation amount of the sludge soft foundation, wherein the time length when the sedimentation rate after detonation tends to be stable is the blasting interval time. When the sedimentation rate tends to be stable, the drainage effect of the last blasting is close to the maximum, and the consolidation effect and the treatment time can be fully balanced in the same foundation environment.
In step B1, a step B0 of determining the blasting interval time is further included: and before the first detonation, performing a plurality of times of pre-blasting, acquiring the time length when the settlement rate tends to be stable after each time of pre-blasting as the single pre-blasting interval time, and taking the average value of the single pre-blasting interval time of all the pre-blasting as the blasting interval time. The blasting interval time suitable for the current environment can be determined through pre-blasting, so that consolidation drainage treatment is more suitable for the environment and the foundation characteristics, and the adaptability to the environment is improved on the basis of ensuring the overall effect.
In step B2, after each burst, the drain is drawn through the burst tube. Can accelerate the drainage, improve the consolidation treatment effect and reduce the overall treatment time.
Before the step A1, a step A0 of preloading is also provided: the water platform provided with the ballast tank and the blasting channel is prefabricated on land, after the water platform moves to the soft foundation, the ballast tank is filled with water to enable the platform to sit at the bottom, and the blasting pipe is put down through the blasting channel. The platform can provide lasting ballast drainage effect, combines the blasting drainage, and holistic consolidation treatment time is shorter, and the effect is better.
The invention has the advantages that: can greatly shorten the drainage consolidation time, save the construction period, have controllable process, do not fly mud, do not have deep-fried pits, easy operation.
Drawings
FIG. 1 is a graph showing the water displacement of conventional surcharge preloading and multiple blasting;
FIG. 2 is a comparison graph of the drainage curve of the scheme of the invention and the pure surcharge preloading;
FIG. 3 is a graph comparing the displacement curves of soil destruction and soil non-destruction;
FIG. 4 is a diagram of a blasting vibration test apparatus;
FIG. 5 is a graph of displacement versus time for multiple explosions;
1. the waterproof mortar comprises a cover plate, 2 parts of a sand cushion layer, 3 parts of permeable geotextile, 4 parts of a drainage plate, 5 parts of a PVC pipe, 6 parts of firecracker, 7 parts of slurry.
Detailed Description
Examples
A rapid consolidation treatment method for sludge soft foundation comprises the following steps:
a1, burying blasting tube: embedding a hollow blasting tube in the soft foundation;
b1: monitoring the sedimentation amount of the sludge soft foundation, wherein the time length when the sedimentation rate after detonation tends to be stable is the blasting interval time;
b2, multiple blasting: and blasting for multiple times in the blasting pipe according to the same blasting interval time, and after each blasting, drawing out the drainage through the blasting pipe.
Carry out a lot of blasting in the blast pipe, can not fly mud, also do not have the blast pit, the settlement of ground when the drainage is even, carry out a lot of blasting according to the same blasting interval time, both can shorten the time of whole construction, also can ensure the effect of blasting drainage at every turn, under the circumstances that total displacement is confirmed, the time of the processing of can very big shortening consolidation. When the sedimentation rate tends to be stable, the drainage effect of the last blasting is close to the maximum, and the consolidation effect and the treatment time can be fully balanced in the same foundation environment. As can be seen from fig. 1 and 2, in the case of simple preloading and multiple blasting but with a long interval time, the treatment time required for both of these two methods is longer than that of the method of the present invention under the condition of similar total amount of drainage. Referring to fig. 3, when blasting in the blasting tube, the soil is not damaged, but blasting directly in the soft soil foundation, the soil is damaged, and compared with the two, there is a significant difference in the water displacement.
In order to accurately determine the actual drainage condition of the sludge soft foundation in the environment, in step B1, a step B0 of determining the blasting interval time is performed: and before the first detonation, performing a plurality of times of pre-blasting, acquiring the time length when the settlement rate tends to be stable after each time of pre-blasting as the single pre-blasting interval time, and taking the average value of the single pre-blasting interval time of all the pre-blasting as the blasting interval time. The blasting interval time suitable for the current environment can be determined through pre-blasting, so that consolidation drainage treatment is more suitable for the environment and the foundation characteristics, and the adaptability to the environment is improved on the basis of ensuring the overall effect.
In order to carry out foundation consolidation treatment in the intertidal zone of the open sea, before the step A1, a step A0 of preloading is also provided: the water platform provided with the ballast tank and the blasting channel is prefabricated on land, after the water platform moves to the soft foundation, the ballast tank is filled with water to enable the platform to sit at the bottom, and the blasting pipe is put down through the blasting channel. The platform can provide lasting ballast drainage effect, combines the blasting drainage, and holistic consolidation treatment time is shorter, and the effect is better.
To further prove the beneficial effects of the invention, the following experiments prove that:
first, test conditions
The initial load is 0.2kN, after the sedimentation is stable, 0.2kN is added every 5min until the load reaches 5kN, and then the explosive load is applied.
Second, test protocol
(1) Firstly, preparing the slurry 7, uniformly mixing the slurry 7 as much as possible, and filling the mixture into a model barrel;
(2) a PVC pipe 5 is inserted in the middle of the device, and firecracker 6 is filled inside the device;
(3) inserting the vertical drainage plate 4, and laying the permeable geotextile 3 as shown in figure 4;
(4) paving dry fine sand on the surface of the geotextile to form a sand cushion layer 2;
(5) arranging a cover plate 1 on the top of the sand cushion layer 2, and applying pre-pressing static load on the cover plate 1 in a grading manner until the pre-pressing static load reaches 5 kN;
(6) igniting the firecracker 6 after the pre-pressing is finished, and carrying out repeated explosion treatment for 5 times;
(7) the treatment effect of the two conditions on the sludge is researched through the comparison of the sedimentation velocity.
Third, test results
Fig. 5 is a graph of displacement versus time for multiple explosions, and it can be seen that each explosion produces instantaneous rapid settling. Selecting the prepressing time of each explosion action gap of every 2 times before and after as the static load action characteristic time T, and accumulating the settlement generated by prepressing between every 2 times of explosion as the total settlement value S of the static load; and selecting the time corresponding to 5 times of sedimentation mutation as the characteristic time t of the explosion action, and accumulating the sedimentation mutation quantity of 5 times of explosion action as the total sedimentation s of the explosion action. The specific values are shown in table 1-static load and multiple initiation settlement statistics.
Detonation effect settling rate:
vs＝s/t
the average settling rate of five explosions was 9.87X 10-4mm/s, and an average sedimentation rate under static load of 4.08X 10-4mm/s, the sedimentation rate of the sludge under the action of explosion is 2.4 times of that of static load, which shows that the time of consolidation and drainage is greatly shortened by multiple explosions。
Claims (5)
1. A rapid consolidation processing method for sludge soft foundation is characterized in that: the method comprises the following steps: a1, burying blasting tube: embedding a hollow blasting tube in the soft foundation; b2, multiple blasting: multiple blasts are carried out in the blast pipe according to the same blasting interval time.
2. The rapid consolidation processing method for sludge soft foundation according to claim 1, characterized in that: step B1 of determining the time between blasts is also included before step B2: and monitoring the sedimentation amount of the sludge soft foundation, wherein the time length when the sedimentation rate after detonation tends to be stable is the blasting interval time.
3. The rapid consolidation processing method for sludge soft foundation according to claim 2, characterized in that: in step B1, a step B0 of determining the blasting interval time is further included: and before the first detonation, performing a plurality of times of pre-blasting, acquiring the time length when the settlement rate tends to be stable after each time of pre-blasting as the single pre-blasting interval time, and taking the average value of the single pre-blasting interval time of all the pre-blasting as the blasting interval time.
4. The rapid consolidation processing method for sludge soft foundation according to claim 3, characterized in that: in step B2, after each burst, the drain is drawn through the burst tube.
5. The rapid consolidation processing method for sludge soft foundation according to claim 4, characterized in that: before the step A1, a step A0 of preloading is also provided: the water platform provided with the ballast tank and the blasting channel is prefabricated on land, after the water platform moves to the soft foundation, the ballast tank is filled with water to enable the platform to sit at the bottom, and the blasting pipe is put down through the blasting channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010893073.3A CN114108596A (en) | 2020-08-31 | 2020-08-31 | Rapid consolidation treatment method for sludge soft foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010893073.3A CN114108596A (en) | 2020-08-31 | 2020-08-31 | Rapid consolidation treatment method for sludge soft foundation |
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| Publication Number | Publication Date |
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| CN114108596A true CN114108596A (en) | 2022-03-01 |
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| CN202010893073.3A Pending CN114108596A (en) | 2020-08-31 | 2020-08-31 | Rapid consolidation treatment method for sludge soft foundation |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002047638A (en) * | 2000-08-01 | 2002-02-15 | Sato Kogyo Co Ltd | Ground improvement construction method combined with blasting construction method |
| CN1683718A (en) * | 2004-08-05 | 2005-10-19 | 铁道科学研究院 | Draining and reinforcing treating method for soft soil foundation |
| CN105201007A (en) * | 2015-09-29 | 2015-12-30 | 广州中国科学院工业技术研究院 | Building on mud flat and building method thereof |
| CN106759225A (en) * | 2016-11-29 | 2017-05-31 | 天津大学 | The deep barged-in fill vacuum pre-pressed joint explosion reinforcement means of high-moisture |
-
2020
- 2020-08-31 CN CN202010893073.3A patent/CN114108596A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002047638A (en) * | 2000-08-01 | 2002-02-15 | Sato Kogyo Co Ltd | Ground improvement construction method combined with blasting construction method |
| CN1683718A (en) * | 2004-08-05 | 2005-10-19 | 铁道科学研究院 | Draining and reinforcing treating method for soft soil foundation |
| CN105201007A (en) * | 2015-09-29 | 2015-12-30 | 广州中国科学院工业技术研究院 | Building on mud flat and building method thereof |
| CN106759225A (en) * | 2016-11-29 | 2017-05-31 | 天津大学 | The deep barged-in fill vacuum pre-pressed joint explosion reinforcement means of high-moisture |
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Address after: 511458 Nansha District seashore road, Guangzhou, Guangzhou, Guangdong Applicant after: GUANGZHOU INSTITUTE OF INDUSTRY TECHNOLOGY Address before: 511458 Nansha District seashore road, Guangzhou, Guangzhou, Guangdong Applicant before: INSTITUTE OF INDUSTRY TECHNOLOGY GUANGZHOU & CHINESE ACADEMY OF SCIENCES |
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Application publication date: 20220301 |
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