CN114875884A - Foundation dynamic compaction construction method for high fill of stone pit - Google Patents
Foundation dynamic compaction construction method for high fill of stone pit Download PDFInfo
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- CN114875884A CN114875884A CN202210595032.5A CN202210595032A CN114875884A CN 114875884 A CN114875884 A CN 114875884A CN 202210595032 A CN202210595032 A CN 202210595032A CN 114875884 A CN114875884 A CN 114875884A
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- 238000005056 compaction Methods 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 42
- 239000004575 stone Substances 0.000 title claims description 7
- 239000002689 soil Substances 0.000 claims description 39
- 238000000034 method Methods 0.000 claims description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 6
- 230000003068 static effect Effects 0.000 claims description 6
- 238000007689 inspection Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000003415 peat Substances 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000003908 quality control method Methods 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005096 rolling process Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000010959 steel Substances 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
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Structural Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A foundation dynamic compaction construction method for high fill of a quarry pit is characterized by comprising the following steps: a. b, dynamic compaction parameters, c and backfill requirements. The construction method for dynamic compaction of the foundation with high fill of the quarrying pit has the advantages of simple construction measures, large layering thickness, easy quality control, obvious reinforcing effect, low cost and short construction period, and can obviously improve the compactness and the bearing capacity of the foundation of the high fill in a very short time.
Description
Technical Field
The invention relates to the technical field of foundation engineering, in particular to a foundation dynamic compaction construction method for high fill of a quarry pit.
Background
With the development of economic construction and the need of external development in China, not only the construction is carried out on sites with good geological conditions in advance, but also the construction is carried out on places with poor geological conditions, so that the natural weak foundation or the high-fill foundation of a quarrying pit needs to be treated. In order to control the high fill of the quarrying pit and utilize the quarrying pit backfill site to the maximum extent to enable the backfill site to meet the geological structure requirement of the construction land, a layering rolling method is usually adopted, but the backfill rolling times are more, the construction in rainy seasons needs to be avoided, geogrids need to be laid on each layer of backfill soil, the influence of human factors is great in the construction process, the process control difficulty is great, the effect is not guaranteed, when the requirements of foundation bearing capacity cannot be met by poor grain grading, large grain size, thick filling layer and the like, the layering rolling method is thin in layering thickness, the grain size grading control requirement is strict, the process is complex, the management difficulty is very great under the condition of large-scale construction, and the quality is difficult to control.
Therefore, the known treatment method for the high-fill foundation of the quarry pit has various inconveniences and problems.
Disclosure of Invention
The invention aims to provide a safe and reliable foundation dynamic compaction construction method for high filling of a quarry pit.
In order to achieve the purpose, the technical solution of the invention is as follows:
a foundation dynamic compaction construction method for high fill of a quarry pit is characterized by comprising the following steps:
a. foundation dynamic compaction construction process
(1) After the filling soil is backfilled to the designed elevation, the field is leveled, the 4000KN energy level is leveled, the spot tamping is carried out for the first time, the rammed pit is pushed to be flat → the gap period is more than 3 days, the 4000KN energy level is leveled for the second time, the rammed pit is pushed to be flat → the 2000KN energy level is fully tamped → the static repair period is met, and the inspection and acceptance of workers are carried out after the static repair period is met;
(2) tamping the elevation interval for 6m once;
b. dynamic compaction parameter
(1) Point ramming and tamping are carried out in two times by adopting the rammer weight of 28t, the diameter of the rammer of 2.5m, the falling distance of 15m and the ramming point distance of 6m, wherein the ramming points of the first ramming point are arranged in a square shape, and the ramming points of the second ramming point are positioned at the center of the square formed by the first ramming point;
(2) the full-compaction ramming energy is 2000KNm, the hammer weight is 28t, the diameter of the rammer is 2.5m, the drop distance is 8m, the ramming frequency is 3 times, the diameter of the hammer is overlapped 1/4, and the full-compaction is carried out twice;
c. requirement for backfill
Filling cohesive soil in a building foundation range, wherein the maximum particle size of a cohesive soil block is not more than 100mm, and sludge, marsh soil, peat soil, frozen soil, organic soil, collapsible soil, expandable soil and soil containing household garbage cannot be mixed; the water content of the filler is checked before filling, and the filler is held by hand to form a ball and falls to the ground to flower; when the water content is higher, a measure of turning up and airing and uniformly doping soil is adopted; when the water content is lower, the water can be sprayed in advance to be wet, and the compaction times are increased or high-power compaction mechanical measures are used.
The foundation dynamic compaction construction method for high fill of the quarry pit can be further realized by adopting the following technical measures.
In the method, the number of times of point ramming and tamping is not less than 7.
In the method, the point ramming and tamping energy is more than or equal to 4000 KNm.
The method is characterized in that the time interval between the first-time tamping point and the second-time tamping point is more than or equal to 3 d.
The method of the preceding, wherein the compaction machine is a tracked dynamic compactor.
After the technical scheme is adopted, the foundation dynamic compaction construction method for high fill of the quarry pit has the following advantages:
1. the construction measures are simple, the layering thickness is large, and the quality is easy to control;
2. the reinforcement effect is remarkable, and the compactness and the foundation bearing capacity of the high-fill soil can be obviously improved in a very short time;
3. the cost is low, and the construction period is short.
Drawings
FIG. 1 is a block diagram of a dynamic compaction construction process according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a dynamic compaction layout point according to an embodiment of the invention;
fig. 3 is a schematic plan view of arrangement of high-fill dynamic compaction points according to an embodiment of the invention.
In the figure: 1 point tamping for the first pass and 2 point tamping for the second pass.
Detailed Description
The present invention will be further described with reference to the following examples and the accompanying drawings.
Example 1
Referring to fig. 1, fig. 1 is a block diagram of a dynamic compaction process according to an embodiment of the present invention. The invention relates to a foundation dynamic compaction construction method for high fill of a quarrying pit, which comprises the following steps:
a. foundation dynamic compaction construction process
(1) And after backfilling to the designed elevation, leveling the site → leveling at the 4000KN energy level for the first time → leveling the rammed pit → the gap period meeting more than 3 days → leveling the rammed pit at the 4000KN energy level for the second time → leveling the rammed pit → full leveling at the 2000KN energy level → the static repair period meeting the post-detection inspection and acceptance.
(2) The distance between ramming elevations (elevations) is 6 m.
b. Dynamic compaction parameter
(1) The point ramming and tamping energy is 4000KNm, the hammer weight is 28t, the diameter of the rammer is 2.5m, the drop distance is 15m, the distance between ramming points is 6m, the point ramming times is 7 times, the point ramming is carried out twice, the first-time point ramming 1 is arranged in a square, the second-time point ramming 2 is located at the centroid of the square formed by the first-time point ramming, and the interval time of the two-time point ramming is not less than 3 d. Fig. 2 is a schematic diagram of a dynamic compaction layout point according to an embodiment of the present invention.
(2) The full-compaction ramming energy is 2000KNm, the hammer weight is 28t, the diameter of the rammer is 2.5m, the drop distance is 8m, the ramming frequency is 3 times, the diameter of the hammer is overlapped 1/4, and the full-compaction is carried out twice.
c. The requirement of backfill soil:
the cohesive soil is adopted for filling in the range of building foundations, the maximum particle size of soil blocks is not more than 100mm, and sludge, marsh soil, peat soil, frozen soil, organic soil, collapsible soil, expandable soil and soil containing household garbage cannot be mixed. The water content of the filler should be checked before filling, and the filler is preferably held by hand to form a ball and fall to the ground to flower. When the water content is higher, measures such as loosening and airing, uniformly doping soil and the like can be adopted; when the water content is lower, the water can be sprayed in advance to be wet, and the number of times of compaction is increased or a high-power compaction machine is used.
TABLE 1 construction machinery and equipment parameters for foundation dynamic compaction of high fill of quarry pit
| Device name | Model specification | Description of the invention |
| Crawler-type dynamic compaction machine | 4000KN·m | Satisfy rammer hoisting weight and promoteAnd a safety device is arranged to prevent the arm from bending backwards during tamping. |
| Dynamic compaction rammer | 28t | The rammer uses a round flat-bottom hammer with air holes, and the shell is made of a steel plate. The bottom of the rammer is circular, the diameter of the bottom of the rammer is 2.5m, 4 vent holes are arranged, the hole diameter is 300-400mm, and the rammer is communicated up and down. |
| Unhooking device | Automatic | The device has the advantages of enough strength, no sliding groove during hoisting, flexible unhooking, capability of keeping the rammer to stably fall, and convenience and rapidness in hooking. |
| Level gauge | S3 | And measuring the tamping settlement. |
| Digging or soil-shifting machines | PC350 | And (5) leveling the ground after tamping. |
Fig. 3 is a schematic plan view of arrangement of high-fill dynamic compaction points according to an embodiment of the invention. The foundation dynamic compaction construction method for high fill of the quarrying pit requires that the average ramming amount of the last two strokes is not more than 50mm, no overlarge bulge occurs around the ramming pit, and the difficult hammering caused by the overlong depth of the ramming pit is avoided.
The invention relates to a foundation dynamic compaction construction method for high fill of a stone pit, which comprises the following cautions:
(1) the invention is suitable for the height of a quarrying pit not more than 12m and the area not more than 12000m 2 The irregular shape (or regular shape) high fill, the characteristic value fak of the bearing capacity of the foundation obtained by static load after dynamic compaction is finished is more than or equal to 140KPa, and the compactness is more than or equal to 92 percent.
(2) Selecting a block with the area of 20m in the dynamic compaction area 2 ×20m 2 =400m 2 The trial tamping area adjusts and optimizes the parameters and processes (such as tamping point distance, single-point beating number, hammer withdrawal standard, tamping pass number, intermittent time and the like) on the premise of meeting the use requirements of the foundation through small-area trial tamping, on-site monitoring, trial tamping effect detection and the like, and provides basis for large-area construction parameters and construction processes.
(3) Before the dynamic compaction construction, the positions and elevations of underground structures and various underground pipelines in the field range are found out, and necessary measures are taken to avoid damage caused by the dynamic compaction.
(4) In the dynamic compaction process, monitoring of the surrounding environment is enhanced, a compaction pit is timely backfilled, and leveling and compaction are carried out.
(5) A water interception (water interception ditch) measure is made on a high-fill side slope, and after rainfall, if the water content of the surface of the field is higher, full-tamping construction cannot be carried out, and if no water is accumulated on the surface of the field, main tamping reinforcement tamping construction can be carried out as usual.
Compared with the layering rolling method, the foundation dynamic compaction construction method for high fill of the stone pit of the invention applies different energy levels of point compaction and full compaction to a high fill backfill site with large area, wide range and deep depth, adopts backfill materials used on site, and adopts the layering backfill dynamic compaction, can apply a huge impact energy to a foundation soil body in a very short time to convert the impact energy into various wave patterns to be transmitted to the soil body, so that the soil body generates a series of physical changes, the compactness and the foundation bearing capacity of the high fill soil can be obviously improved, the land recycling of the stone pit is well promoted, the damage of open mining to the original landform is recovered, and the use requirement in the bad geological control process is met. The foundation dynamic compaction construction method for high fill of the quarrying pit has the advantages of simple process, large layering thickness, easy quality control, obvious reinforcement effect, low cost and good applicability and application effect.
The foundation dynamic compaction construction method for high fill of the quarrying pit is applied in the actual engineering project, is easy to operate, ensures the quality, has obvious reinforcing effect, is accepted by supervision units and construction units consistently, is popular with operators, obtains good economic benefit and social influence, and has great popularization value.
The above embodiments are provided only for illustrating the present invention and not for limiting the present invention, and those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Claims (5)
1. A foundation dynamic compaction construction method for high fill of a quarry pit is characterized by comprising the following steps:
a. foundation dynamic compaction construction process
(1) After the filling soil is backfilled to the designed elevation, the field is leveled, the 4000KN energy level is leveled, the spot tamping is carried out for the first time, the rammed pit is pushed to be flat → the gap period is more than 3 days, the 4000KN energy level is leveled for the second time, the rammed pit is pushed to be flat → the 2000KN energy level is fully tamped → the static repair period is met, and the inspection and acceptance of workers are carried out after the static repair period is met;
(2) tamping the elevation interval for 6m once;
b. dynamic compaction parameter
(1) Point ramming and tamping are carried out in two times by adopting the rammer weight of 28t, the diameter of the rammer of 2.5m, the falling distance of 15m and the ramming point distance of 6m, wherein the ramming points of the first ramming point are arranged in a square shape, and the ramming points of the second ramming point are positioned at the center of the square formed by the first ramming point;
(2) the full-compaction ramming energy is 2000KNm, the hammer weight is 28t, the diameter of the rammer is 2.5m, the drop distance is 8m, the ramming frequency is 3 times, the diameter of the hammer is overlapped 1/4, and the full-compaction is carried out twice;
c. requirement for backfill
Filling cohesive soil within a building foundation range, wherein the maximum particle size of a cohesive soil block is not more than 100mm, and sludge, marsh soil, peat soil, frozen soil, organic soil, collapsible soil, expandable soil and soil containing household garbage cannot be mixed; the water content of the filler is checked before filling, and the filler is held by hand to form a ball and falls to the ground to flower; when the water content is higher, a measure of turning up and airing and uniformly doping soil is adopted; when the water content is lower, the water can be sprayed in advance to be wet, and the compaction times are increased or high-power compaction mechanical measures are used.
2. The dynamic compaction construction method for the foundation of the high fill of the stone pit according to claim 1, wherein the number of times of point compaction and tamping is not less than 7.
3. The dynamic compaction construction method for foundation of quarry pit high fill according to claim 1, wherein the point-tamping energy is not less than 4000 KNm.
4. The construction method for dynamic compaction of foundation filled with high fill of stone pit according to claim 1, wherein the time interval between the first and second tamping points is not less than 3 d.
5. The dynamic compaction construction method for the foundation of the high fill of the quarry pit according to claim 1, wherein the compacting machine is a crawler-type dynamic compactor.
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| CN202210595032.5A CN114875884A (en) | 2022-05-29 | 2022-05-29 | Foundation dynamic compaction construction method for high fill of stone pit |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049407A (en) * | 2016-06-25 | 2016-10-26 | 中国水利水电第四工程局有限公司 | Foundation dynamic compaction construction method |
| CN108252291A (en) * | 2017-12-23 | 2018-07-06 | 山西机械化建设集团公司 | The construction method of the coastal backfill super thick foundation of gravelly soil of 25000KN.m heavy tamping treatments |
| CN113026715A (en) * | 2021-03-31 | 2021-06-25 | 中冶建工集团有限公司 | High-fill roadbed dynamic compaction construction method |
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- 2022-05-29 CN CN202210595032.5A patent/CN114875884A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049407A (en) * | 2016-06-25 | 2016-10-26 | 中国水利水电第四工程局有限公司 | Foundation dynamic compaction construction method |
| CN108252291A (en) * | 2017-12-23 | 2018-07-06 | 山西机械化建设集团公司 | The construction method of the coastal backfill super thick foundation of gravelly soil of 25000KN.m heavy tamping treatments |
| CN113026715A (en) * | 2021-03-31 | 2021-06-25 | 中冶建工集团有限公司 | High-fill roadbed dynamic compaction construction method |
Non-Patent Citations (1)
| Title |
|---|
| 孟宪中等: "回填块石土强夯施工工艺的确定及设计优化", 《探矿工程(岩土钻掘工程)》 * |
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Application publication date: 20220809 |
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