CN114575327A - Improvement and high-fill reinforcement construction method for flow-plastic or soft-plastic clay filler - Google Patents
Improvement and high-fill reinforcement construction method for flow-plastic or soft-plastic clay filler Download PDFInfo
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- CN114575327A CN114575327A CN202210327833.3A CN202210327833A CN114575327A CN 114575327 A CN114575327 A CN 114575327A CN 202210327833 A CN202210327833 A CN 202210327833A CN 114575327 A CN114575327 A CN 114575327A
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- 239000004927 clay Substances 0.000 title claims abstract description 32
- 238000010276 construction Methods 0.000 title claims abstract description 30
- 239000000945 filler Substances 0.000 title claims abstract description 22
- 230000002787 reinforcement Effects 0.000 title claims description 12
- 238000005056 compaction Methods 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000000465 moulding Methods 0.000 claims abstract 4
- 239000004575 stone Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 abstract description 6
- 230000001976 improved effect Effects 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003415 peat Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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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
- E02D3/046—Improving by compacting by tamping or vibrating, e.g. with auxiliary watering of the 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
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- 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)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention belongs to the technical field of building foundation treatment, and particularly relates to a construction method for improving and reinforcing a flow-plastic or soft-plastic clay filler. Comprises the following steps. S100, processing and detecting the original foundation; s200, spreading flow-molding or soft-molding clay on the base surface of the original foundation; s300, paving blocks and gravels to form a paving layer together; s400, repeating the step S300 according to the length of 3-5m in a circulating way until a working surface is formed; s500, discharging the dynamic compaction to replace a main compaction point on the working surface; s600, preparing blocks and gravels for tamping pit fillers near a main tamping point; s700, positioning the tamping machine according to the measured main tamping point machine position; s800, tamping each tamping point according to the preset number of single-point tamping times in each time; s900, performing full-tamping lofting; s1000-full ramming construction; s1100, construction detection; S1200-S200-S1100 are repeated, and the steps are repeated until backfilling is completed. The invention uses the rammer to ramme the strong mixing way to squeeze the blocks and the gravels into the concrete, thus achieving the improved effect and carrying out high-fill filling.
Description
Technical Field
The invention belongs to the technical field of building foundation treatment, and particularly relates to a construction method for improving and reinforcing a flow-plastic or soft-plastic clay filler.
Background
In engineering construction, various specifications have clear limitations on the use of high-water-content soil as a filler, such as the requirements of technical Specification for Highway subgrade construction (JTG F10-2006) 4.1.2: peat, silt, frozen soil, strong expansive soil, organic soil and soil with more than allowable content of soluble salt cannot be directly used for filling roadbed, and fine soil with liquid limit of more than 50%, plasticity index of more than 26 and water content not suitable for direct compaction cannot be directly used as embankment filler. As for the soil property, direct spoil is generally adopted and cannot be directly used for filling materials.
However, as various national infrastructures are implemented in the whole country, the engineering construction filler cannot be selected due to different geological conditions and strict environmental requirements in special regions. Some engineering supporting carriers are influenced by environmental protection requirements, and high-viscosity, high-water-content and high-compressibility soil (with high organic matter content and belonging to organic soil-medium peat soil) must be adopted for high-filling and filling, so that the technical problem in the engineering field is solved.
Disclosure of Invention
The invention provides a method for improving blending and paving reinforcement through dynamic compaction replacement, which aims at the problems and provides a construction method for improving and reinforcing a flow-plastic or soft-plastic clay filler.
The invention adopts the following technical scheme: a construction method aiming at improvement and high fill reinforcement of a flow-plastic or soft-plastic clay filler comprises the following steps of S100, processing and detecting an original foundation; s200, after the base surface is qualified, paving plastic or soft plastic clay on the base surface of the original foundation; s300, spreading plastic or soft plastic clay 3-5m in length horizontally along the length direction of a working face, and then spreading blocks and broken stones on the surface of the clay to form a spreading layer; s400, repeating the step S300 according to the length of 3-5m in a circulating way until a working surface is formed; s500, on the working surface, measuring and setting off, and discharging a dynamic compaction to replace a main compaction point; s600, preparing blocks and gravels for tamping pit fillers near a main tamping point; s700, positioning the tamping machine according to the main tamping point position determined by measurement; s800, tamping each tamping point according to the preset number of single-point tamping times in each time; s900, performing full-compaction lofting; s1000-full ramming construction: energy level 1500KN m, ramming overlap 1/4 hammer diameter, 4 hits per point; completing one-time and one-click; s1100, construction detection; s1200, repeating S200-S1100, and repeating the steps till the backfilling is finished to form a block or a broken stone pier cylinder with the diameter of more than or equal to 3.5m and the height of more than or equal to 4 m.
In the step S300, the selected indexes of the blocks and the crushed stones are that the maximum grain diameter is less than 300mm, the uneven coefficient Cu is more than 5, the curvature coefficient 3 is more than Cc is more than 1, the strength is more than or equal to 30MPa, the mud content is more than or equal to 5 percent, and the total amount of the blocks and the crushed stones with the grain diameters of 200-300 mm is less than 30 percent.
The thickness of the flow-plastic or soft-plastic clay paved in the step S200 is h1, the thickness of the blocks and the gravels paved in the step S300 is h2, h1/h2=4, and h1+ h2 is less than or equal to 4 m.
In step S400, the working surface is 500m or more2。
In step S500, the distance between the main tamping points is 4m, and the points are distributed in a regular triangle.
In step S800, the process is finished by row-by-row point-by-point one time, the energy level is 3000KN · m, a 20t rammer is adopted, and the falling distance is 15 m.
S801, firstly tamping 5 strokes, backfilling gravel or blocks and gravels, and filling and leveling a tamping pit; s802, aligning the original main tamping point, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling the tamping pit; s803, aligning to the original point again, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling up the tamping pit; s804, finally aligning to the original point, tamping for 3 times, backfilling gravel or blocks and gravels, and filling and leveling up the tamping pit; s805, moving the machine to carry out next tamping until one-time tamping in the operation area is completed.
In step S1100, the qualified construction detection standard is: the compaction coefficient is more than or equal to 0.90, and the characteristic value f of the bearing capacity of the foundationakNot less than 150kPa, and the compression modulus Es not less than 10 MPa.
Compared with the prior art, the invention has the following beneficial effects:
1) the invention uses a rammer ramming strong mixing mode to extrude the blocks and the gravels into high-viscosity, high-water-content and high-compressibility soil (namely, clay in a flowing plastic shape to a soft plastic shape), thereby achieving the improvement effect and carrying out high-fill filling.
2) The invention adopts a strong ramming and blending and reinforcing mode, namely, the conventional construction process with more times and less hitting numbers is changed into a process of line-by-line, point-by-point, one-time and multiple completion, namely, the first point ramming and tamping → filling → origin point tamping → filling → secondary origin point tamping → filling → three-time origin point tamping → filling → full tamping is specially used for high-viscosity, high-water-content and high-compressibility soil, so as to achieve the purpose of reinforcing the high-viscosity, high-water-content and high-compressibility soil by means of strong ramming and blending blocks and broken stones simultaneously and strong ramming and extruding.
Drawings
Fig. 1 is a schematic diagram of a dynamic compaction point.
Detailed Description
An improvement and high fill reinforcement construction method aiming at a flow-plastic or soft-plastic clay filler comprises the following steps,
s100, processing and detecting the original foundation.
S200, after the foundation is qualified through detection, high-viscosity, high-water-content and high-compressibility soil (namely, the flowing plastic-soft plastic clay) with the thickness of 3.2m and the length of 3-5m is paved on the qualified foundation surface through original foundation treatment, and a forward, non-single material and direct stacking filling mode is adopted for backfilling.
S300, spreading plastic or soft plastic clay 3-5m in length horizontally along the length direction of the working surface, and then spreading blocks and gravels on the surface of the clay to form a spreading layer together, so as to form a block and a gravel layer with the thickness of 0.8 m; the selected indexes of the blocks and the crushed stones are that the maximum grain diameter is less than 300mm, the uneven coefficient Cu is more than 5, the curvature coefficient 3 is more than Cc is more than 1, the strength is more than or equal to 30MPa, the mud content is more than or equal to 5 percent, and the total amount of the blocks and the crushed stones with the grain diameters of 200-300 mm is less than 30 percent.
The thickness of the flow-plastic or soft-plastic clay paved in the step S200 is h1, the thickness of the blocks and the broken stones paved in the step S300 is h2, h1/h2=4, and h1+ h2 is not more than 4 m. In this example, h1 was 3.2m and h2 was 0.8 m. At this time, h1/h2=4 and h1+ h2=4 m. Through test and detection, the treatment effect can reach the best.
S400, repeating the step S300 according to the length of 3-5m in a circulating way until a working surface is formed. The method is a reasonable working surface range determined by considering the reverse progress calculation requirement according to the project progress and the basic working surface of the equipment at the same time, such as 600 square meters and 1000 square meters.
The method specifically comprises the following steps: backfilling high-viscosity, high-water-content and high-compressibility soil (namely clay in a flow plastic shape to a soft plastic shape) with the thickness of 3.2m, and paving blocks and broken stones with the thickness of 0.8 m. The thickness of the layered backfill is 3.2+0.8=4 m; and the whole section propulsion and forward backfilling is adopted in the horizontal direction, and broken stones with the thickness of 0.8m are backfilled when high-viscosity, high-water-content and high-compressibility soil (namely, flowing plastic-soft plastic clay) with the length of 3-5m is backfilled forwards so as to ensure the equipment to walk.
S500, on the working surface, measuring and paying off, discharging the dynamic compaction and replacing main compaction points, wherein the distance between the main compaction points is 4m, and the points are distributed in a regular triangle.
S600, tamping pit filler blocks and broken stones near a main tamping point.
S700, positioning the tamping machine according to the point position determined by measurement.
And S800, tamping each tamping point according to preset times and the single-point tamping number of each time, completing the tamping one time point by point line by line, wherein the energy level is 3000KN m, a 20t tamping hammer is adopted, and the falling distance is 15 m.
S801, firstly, tamping 5 strokes, backfilling gravel or blocks and broken stones, and filling and leveling a tamping pit; s802, aligning to the original point, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling up a tamping pit; s803, aligning to the original point again, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling up the tamping pit; s804, finally aligning to the original point, tamping for 3 times, backfilling gravel or blocks and gravels, and filling and leveling the tamping pit. And then moving the machine to carry out next tamping point tamping until the tamping point tamping in the operation area is completed once.
S900, performing full-tamping lofting.
S1000-full ramming construction: energy level 1500KN m, ramming overlap 1/4 hammer diameter, 4 hits per point; completing one-time and one-click;
s1100, construction detection; the compaction coefficient is more than or equal to 0.90, and the characteristic value f of the bearing capacity of the foundationakNot less than 150kPa, and the compression modulus Es not less than 10 MPa.
S1200-repeating S200-S1100, and repeating the steps until backfilling is completed to form a block and gravel pier column body with the diameter not less than 3.5 m; the height of the pier column body is not less than 4 m. The blending improvement effect is achieved for high-viscosity, high-water-content and high-compressibility soil (namely clay in a flowing plastic shape to a soft plastic shape).
Claims (8)
1. A construction method for improving and reinforcing a fluid-plastic or soft-plastic clay filler is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
s100, processing and detecting the original foundation;
s200, after the base surface is qualified, paving plastic or soft plastic clay on the base surface of the original foundation;
s300, paving the flow plastic or soft plastic clay 3-5m in length horizontally along the length direction of the working face, and paving blocks and broken stones on the surface of the clay to form a paving layer together;
s400, repeating the step S300 according to the length of 3-5m in a circulating way until a working surface is formed;
s500, on the working surface, measuring and setting off, and discharging a dynamic compaction to replace a main compaction point;
s600, preparing blocks and gravels for tamping pit fillers near a main tamping point;
s700, positioning the tamping machine according to the main tamping point position determined by measurement;
s800, tamping each tamping point according to the preset number of single-point tamping times in each time;
s900, performing full-tamping lofting;
s1000-full ramming construction: energy level 1500KN m, ramming overlap 1/4 hammer diameter, 4 hits per point; completing one-time and one-click;
s1100, construction detection;
s1200, repeating S200-S1100, and repeating the steps till the backfilling is finished to form a block or a broken stone pier cylinder with the diameter of more than or equal to 3.5m and the height of more than or equal to 4 m.
2. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 1, characterized in that: in the step S300, the selected indexes of the blocks and the crushed stones are that the maximum grain diameter is less than 300mm, the uneven coefficient Cu is more than 5, the curvature coefficient 3 is more than Cc is more than 1, the strength is more than or equal to 30MPa, the mud content is more than or equal to 5 percent, and the grain diameter of the blocks and the crushed stones is 200-300 mm is less than 30 percent of the total amount.
3. The improvement and high fill reinforcement construction method for flow-molding or soft-molding clay filler according to claim 1, characterized in that: the thickness of the flow-plastic or soft-plastic clay paved in the step S200 is h1, the thickness of the blocks and the gravels paved in the step S300 is h2, h1/h2=4, and h1+ h2 is less than or equal to 4 m.
4. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 1, characterized in that: in step S400, the working surface is greater than or equal to 500m2。
5. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 1, characterized in that: in the step S500, the distance between the main tamping points is 4m, and the points are distributed in a regular triangle.
6. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 1, characterized in that: in step S800, the process is finished by adopting row by row and point by point once, the energy level is 3000 KN.m, a 20t rammer is adopted, and the falling distance is 15 m.
7. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 6, wherein: the specific construction steps of step S800 are,
s801, firstly, tamping 5 strokes, backfilling gravel or blocks and broken stones, and filling and leveling a tamping pit;
s802, aligning the original main tamping point, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling the tamping pit;
s803, aligning to the original point again, tamping for 5 times, backfilling gravel or blocks and broken stones, and filling and leveling up the tamping pit;
s804, finally aligning to the original point, tamping for 3 times, backfilling gravel or blocks and gravels, and filling and leveling up the tamping pit;
s805, moving the machine to carry out next tamping until one-time tamping in the operation area is completed.
8. The improvement and high fill reinforcement construction method for flow-plastic or soft-plastic clay fillers according to claim 1, characterized in that: in step S1100, the qualified construction detection criteria are: the compaction coefficient is more than or equal to 0.90, and the characteristic value f of the bearing capacity of the foundationakNot less than 150kPa, and the compression modulus Es is not less than 10 MPa.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210327833.3A CN114575327A (en) | 2022-03-31 | 2022-03-31 | Improvement and high-fill reinforcement construction method for flow-plastic or soft-plastic clay filler |
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| CN202210327833.3A CN114575327A (en) | 2022-03-31 | 2022-03-31 | Improvement and high-fill reinforcement construction method for flow-plastic or soft-plastic clay filler |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098156A (en) * | 1993-07-26 | 1995-02-01 | 建设部综合勘察研究院 | Strong-ramming method by pressing additional macadam |
| JPH0734800A (en) * | 1993-07-23 | 1995-02-03 | Tsunetaro Iwabuchi | Backfilling method |
| CN101144272A (en) * | 2007-10-22 | 2008-03-19 | 山西省机械施工公司 | Strong ramming semi-replacement construction technique |
| CN111441331A (en) * | 2020-03-10 | 2020-07-24 | 中国电力工程顾问集团西南电力设计院有限公司 | High-water-content clay dynamic compaction replacement filling foundation and construction method thereof |
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2022
- 2022-03-31 CN CN202210327833.3A patent/CN114575327A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0734800A (en) * | 1993-07-23 | 1995-02-03 | Tsunetaro Iwabuchi | Backfilling method |
| CN1098156A (en) * | 1993-07-26 | 1995-02-01 | 建设部综合勘察研究院 | Strong-ramming method by pressing additional macadam |
| CN101144272A (en) * | 2007-10-22 | 2008-03-19 | 山西省机械施工公司 | Strong ramming semi-replacement construction technique |
| CN111441331A (en) * | 2020-03-10 | 2020-07-24 | 中国电力工程顾问集团西南电力设计院有限公司 | High-water-content clay dynamic compaction replacement filling foundation and construction method thereof |
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