CN113026715A - High-fill roadbed dynamic compaction construction method - Google Patents
High-fill roadbed dynamic compaction construction method Download PDFInfo
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- CN113026715A CN113026715A CN202110351421.9A CN202110351421A CN113026715A CN 113026715 A CN113026715 A CN 113026715A CN 202110351421 A CN202110351421 A CN 202110351421A CN 113026715 A CN113026715 A CN 113026715A
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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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Abstract
The invention discloses a high fill subgrade dynamic compaction construction method, which comprises the following steps: s1, leveling field; s2, drawing a layout diagram of the first tamping point pass and the second tamping point pass by using CAD and extracting coordinates of each tamping point; s3, marking the position of the tamping point for the first time on the construction site by using a marking line according to the coordinates of the tamping point, and measuring the elevation of the tamping point; s4, the tamper is in place and carries out dynamic compaction operation on the tamping point position according to the principle of alternate line jumping from inside to outside; s5, the bulldozer flattens the tamping pit formed in the first tamping, and uses the marked line to play the position of the tamping point for the second tamping; then, completely tamping the second tamping point according to the tamping method and the sequence of the tamping operation in the S4, and intermittently performing a certain time after one strong tamping; s6, performing full-ramming construction, wherein when ramming, ramming overlap 1/4 hammer diameter ramming is performed between two ramming points; s7, tamping the first tamping point and the second tamping point again according to the construction method of S3-S6; and S8, rolling the compacted roadbed by a road roller.
Description
Technical Field
The invention relates to the field of road construction, in particular to a high fill roadbed dynamic compaction construction method.
Background
In road construction, it is generally necessary to perform dynamic compaction work on excavated earth. Specifically, the dynamic compaction method is to freely fall from a high position with a certain height through a certain heavy hammer, apply impact energy to the foundation and form shock waves and dynamic stress in the foundation to enable the foundation to be compacted and vibrated so as to reinforce foundation soil, thereby achieving the purposes of improving the strength of coarse-grained soil, reducing the compressibility of soft soil, improving the liquefaction resistance condition of sandy soil and eliminating the collapsibility of loess. The existing roadbed dynamic compaction operation mainly comprises the following steps: draining water in the early stage, rolling and reinforcing the roadbed after backfilling gravel soil, arranging a drainage ditch, and performing dynamic compaction and roadbed finishing by adopting a point compaction and full compaction combined mode.
In the concrete construction operation, when the waste slag field is constructed, because the backfill layer in the waste slag field is complex, the waste slag comprises poor backfill materials such as silt, construction waste, filling soil, silty clay and the like, when the point ramming method is adopted for construction, because the strength and the pressure resistance of the backfill layer formed by each backfill material are different, the height difference between ramming pits of two ramming points is larger than 5cm, soil in the pits splashes in the ramming process and has the clay hammer absorption phenomenon, the uplift height of the surrounding soil body is larger than 10cm, and the hammer absorption condition cannot be achieved. Meanwhile, the construction safety risk is increased due to the continuous collapse of loose soil around the rammed pit, and the vertical operation of hook personnel is inconvenient due to the fact that the rammed pit is too deep.
Disclosure of Invention
Aiming at the defects of the prior art, the technical problems to be solved by the invention are as follows: how to provide a high fill roadbed dynamic compaction construction method which can carry out dynamic compaction reinforcement on a waste slag yard backfill roadbed, ensures that soil splashing and hammer absorption can not occur during tamping, and ensures that a tamping pit has a large height difference.
In order to solve the technical problems, the invention adopts the following technical scheme:
a high fill roadbed dynamic compaction construction method is characterized by comprising the following steps: s1, leveling the roadbed construction area, surveying the soil condition in the backfill layer aiming at the roadbed backfill area, and surveying whether pipelines, lines and structures needing to be protected are buried in the construction area; s2, drawing a layout of the first-pass ramming points and the second-pass ramming points by applying CAD according to the investigation condition and the length and width of the construction area, and extracting coordinates of each ramming point, wherein the positions of the first-pass ramming points and the second-pass ramming points are arranged in a staggered mode, and the whole ramming points are distributed in a quincunx shape; s3, marking the position of the tamping point for the first time on the construction site by using a marking line according to the coordinates of the tamping point, and measuring the elevation of the tamping point; s4, the tamper is in place and carries out dynamic compaction operation on the tamping point position according to the principle of alternate line jumping from inside to outside; during tamping, firstly, a hoisting hook of the tamping machine is placed to the designed drop distance height, the hoisting hook is used for drawing a steel wire rope to be fixed, and the drop distance is locked; then the rammer is stably lifted and placed at a ramming point, and the top elevation of the rammer handle is measured; finally, hoisting the rammer to a preset height, and automatically unhooking the rammer and dropping the rammer to a ramming point; s5, the bulldozer flattens the tamping pit formed in the first tamping, and uses the marked line to play the position of the tamping point for the second tamping; then, completely tamping the second tamping point according to the tamping method and the sequence of the tamping operation in the S4, and intermittently performing a certain time after one strong tamping; s6, performing full-ramming construction, wherein when ramming, ramming overlap 1/4 hammer diameter ramming is performed between two ramming points; s7, tamping the positions of the tamping points of the first time and the positions of the tamping points of the second time again according to the construction method of S3-S6; and S8, rolling the compacted roadbed by a road roller. Therefore, the arrangement diagram of the tamping points is drawn by applying the CAD technology, the coordinates of the tamping points are determined on the diagram, the coordinates on the diagram are placed at the site position to determine the tamping points, the position accuracy of each tamping point during dynamic compaction can be effectively determined, and the recording and the detection of the depth of a tamping pit at the later stage are facilitated. The dynamic compaction machine is in place, the falling distance height is determined according to the tamping energy required by design for tamping, the whole dynamic compaction process adopts the principles of low energy level, multi-pass tamping, light weight first and heavy weight second and alternate jumping and beating to tamp, the shallow layer with a certain depth is reinforced by using the low energy level, the integrity and the bearing capacity of the shallow layer are improved, and the phenomena of difficulty in lifting a hammer and hooking the shallow layer with excessive depth of a tamping pit, excessive loose and raised height of a soil body at the edge of the pit, soil body collapse and poor tamping pit backfilling and compacting effects are avoided when deep layers are treated at a higher low energy level.
Further, the tamping energy of the first tamping point and the second tamping point in S4 and S5 is the same, and is 1100-1300kN.m, and 6-7 tamping points are used; in S6, the tamping energy of full tamping is 500-700kN.m, and each tamping point is 2-4 strokes; in S7, the tamping energy of the first tamping point and the second tamping point is the same, and is 3000-3500kN.m, and 6-8 tamping points are used. Like this, every ramming point tamps many times, and the ramming ability of ramming point, second time ramming point, full ramming of first time is all inequality, adopts medium ramming ability, low ramming ability and high ramming ability to ram gradually, can effectively ensure that the back ram of ramming does not hang up the soil, and the peripheral backfill layer does not collapse.
Further, after the rammer is in place, the GPS is used for checking, and the deviation of the rammer in place is within +/-15 cm. Therefore, the GPS is adopted for positioning and checking, and the accuracy of each tamping point position can be effectively ensured.
Furthermore, after the roadbed is rolled, extra-heavy cone dynamic sounding is adopted to detect the reinforcement depth and the bulk density to detect the compaction degree, and the workload of digging and exploring pits and the influence of poor pit depth backfilling effect are reduced. During compaction degree detection, 3 typical parts are selected on site to perform a roadbed large-volume density irrigation test, roadbed dry density is calculated, and the compaction degree of each experimental point is calculated; meanwhile, a plurality of exploration pits are uniformly distributed on site, the corrected shot number average value and the variation coefficient of each exploration pit are respectively calculated through an ultra-heavy cone dynamic penetration test, and the compaction degree of each hole is respectively judged; and calculating the weighted average value of the hammering numbers of the dynamic compaction roadbed at the test section, comprehensively judging the compactness of the roadbed at the test section, and judging whether the effective reinforcement depth of the test section meets the design requirement. Therefore, after the dynamic compaction is completed, the compactness of the roadbed can be detected in multiple detection modes so as to meet the set requirement. Compared with sand filling, the large-volume density water filling test water filling saves cost, but the test results are the same, and the extra-heavy cone dynamic sounding detection avoids disturbance of a deep sounding pit 7m below a dynamic compaction surface to a roadbed and potential safety hazards of collapse and burying of a soil body in a pit-down test.
Furthermore, for the dynamic compaction section along the line, when the distance between other objects such as underground pipelines, buildings, structures and the like and the edge of the dynamic compaction reinforced foundation is less than 15m, a shockproof ditch is dug at the position 5m away from the edge of the dynamic compaction. Therefore, by adopting the means, water can be effectively drained through the shockproof ditch, the influence on buildings beside the roadbed is reduced, and meanwhile, other pipelines near the roadbed or below the roadbed can be effectively protected.
Drawings
FIG. 1 is a distribution plot of a first pass tamping position and a second pass tamping position.
Detailed Description
The invention is further illustrated with reference to the following figures and examples.
Example (b):
the dynamic compaction construction method for the high fill roadbed provided by the embodiment comprises the following steps: s1, leveling the roadbed construction area, surveying the soil condition in the backfill layer aiming at the roadbed backfill area, and surveying whether pipelines, lines and structures needing to be protected are buried in the construction area; s2, drawing a layout of the first-pass ramming points and the second-pass ramming points by applying CAD according to the investigation condition and the length and width of the construction area, and extracting coordinates of each ramming point, wherein the positions of the first-pass ramming points and the second-pass ramming points are arranged in a staggered mode, and the whole ramming points are distributed in a quincunx shape; s3, marking the position of the tamping point for the first time on the construction site by using a marking line according to the coordinates of the tamping point, and measuring the elevation of the tamping point; s4, the tamper is in place and carries out dynamic compaction operation on the tamping point position according to the principle of alternate line jumping from inside to outside; during tamping, firstly, a hoisting hook of the tamping machine is placed to the designed drop distance height, the hoisting hook is used for drawing a steel wire rope to be fixed, and the drop distance is locked; then the rammer is stably lifted and placed at a ramming point, and the top elevation of the rammer handle is measured; finally, hoisting the rammer to a preset height, and automatically unhooking the rammer and dropping the rammer to a ramming point; s5, the bulldozer flattens the tamping pit formed in the first tamping, and uses the marked line to play the position of the tamping point for the second tamping; then, completely tamping the second tamping point according to the tamping method and the sequence of the tamping operation in the S4, and intermittently performing a certain time after one strong tamping; s6, performing full-ramming construction, wherein when ramming, ramming overlap 1/4 hammer diameter ramming is performed between two ramming points; s7, tamping the first tamping point and the second tamping point again according to the construction method of S3-S6; and S8, rolling the compacted roadbed by a road roller.
The tamping energy of the first tamping point and the second tamping point in S4 and S5 is the same, and is 1100-1300kN.m, and 6-7 tamping points are used; in S6, the tamping energy of full tamping is 500-700kN.m, and each tamping point is 2-4 strokes; in S7, the tamping energy of the first tamping point and the second tamping point is the same, and is 3000-3500kN.m, and 6-8 tamping points are used. When ramming, install automatic detecting instrument in the ram couple department at rammer top, the operating system that the rammer control room configuration corresponds sets up ramming number of times and fall apart from the parameter in advance, and the system suggestion is higher than normal, lower than normal, highly suitable in the ram altitude mixture control in-process, and suitable interval is fall apart from parameter +/-300 mm. The system counts the tamping times, and when the times reach the standard, the system automatically stops, and can be adjusted to a manual mode for correction. The mode can effectively avoid the hammer leakage phenomenon in the tamping process, and improves the automatic operation of tamping.
Meanwhile, in order to ensure that the position of each ramming point is correct, after the rammer is in place, the GPS is used for checking, and the deviation of the rammer in place is within +/-15 cm.
After the roadbed is rolled, the ultra-heavy cone dynamic sounding is adopted to detect the reinforcement depth and the bulk density to detect the compaction degree, so that the workload of digging and exploring pits and the influence of poor pit depth backfilling effect are reduced. During compaction degree detection, 3 typical parts are selected on site to perform a roadbed large-volume density irrigation test, roadbed dry density is calculated, and the compaction degree of each experimental point is calculated; meanwhile, a plurality of exploration pits are uniformly distributed on site, the corrected shot number average value and the variation coefficient of each exploration pit are respectively calculated through an ultra-heavy cone dynamic penetration test, and the compaction degree of each hole is respectively judged; and calculating the weighted average value of the hammering numbers of the dynamic compaction roadbed at the test section, comprehensively judging the compactness of the roadbed at the test section, and judging whether the effective reinforcement depth of the test section meets the design requirement. Through the compactness detection, the subgrade compactness is greater than 92%, satisfies the design requirement, and the whole closely knit degree of subgrade belongs to well dense, and this test section subgrade effective treatment degree of depth can reach 7m, satisfies the design requirement.
Before tamping construction, the tamping energy can be used for calculating the drop distance of a tamping hammer according to design, and a leveling instrument is erected at a safe distance position; for the dynamic compaction section along the line, when the distance between other objects such as underground pipelines, buildings, structures and the like and the edge of the dynamic compaction reinforced foundation is less than 15m, a shockproof ditch with the depth of 1.5m and the width of 6.5m is dug at the position 5m beyond the edge of the dynamic compaction. And recording the sinking amount of the tamping pit after each tamping is finished.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and although the present invention has been described in detail by referring to the preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of the present invention can be made without departing from the spirit and scope of the technical solutions, and all the modifications and equivalent substitutions should be covered by the claims of the present invention.
Claims (6)
1. A high fill roadbed dynamic compaction construction method is characterized by comprising the following steps: s1, leveling the roadbed construction area, surveying the soil condition in the backfill layer aiming at the roadbed backfill area, and surveying whether pipelines, lines and structures needing to be protected are buried in the construction area; s2, drawing a layout of the first-pass ramming points and the second-pass ramming points by applying CAD according to the investigation condition and the length and width of the construction area, and extracting coordinates of each ramming point, wherein the positions of the first-pass ramming points and the second-pass ramming points are arranged in a staggered mode, and the whole ramming points are distributed in a quincunx shape; s3, marking the position of the tamping point for the first time on the construction site by using a marking line according to the coordinates of the tamping point, and measuring the elevation of the tamping point; s4, the tamper is in place and carries out dynamic compaction operation on the tamping point position according to the principle of alternate line jumping from inside to outside; during tamping, firstly, a hoisting hook of the tamping machine is placed to the designed drop distance height, the hoisting hook is used for drawing a steel wire rope to be fixed, and the drop distance is locked; then the rammer is stably lifted and placed at a ramming point, and the top elevation of the rammer handle is measured; finally, hoisting the rammer to a preset height, and automatically unhooking the rammer and dropping the rammer to a ramming point; s5, the bulldozer flattens the tamping pit formed in the first tamping, and uses the marked line to play the position of the tamping point for the second tamping; then, completely tamping the second tamping point according to the tamping method and the sequence of the tamping operation in the S4, and intermittently performing a certain time after one strong tamping; s6, performing full-ramming construction, wherein when ramming, ramming overlap 1/4 hammer diameter ramming is performed between two ramming points; s7, tamping the positions of the tamping points of the first time and the positions of the tamping points of the second time again according to the construction method of S3-S6; and S8, rolling the compacted roadbed by a road roller.
2. The high fill subgrade dynamic compaction construction method according to the claim 1, characterized in that the tamping energy of the first tamping point and the second tamping point in S4 and S5 is the same, and is 1100-1300kN.m, 6-7 tamping points; in S6, the tamping energy of full tamping is 500-700kN.m, and each tamping point is 2-4 strokes; in S7, the tamping energy of the first tamping point position and the second tamping point position is the same, and is 3000 and 3500kN.m, and 6-8 strokes are carried out on each tamping point.
3. The high fill subgrade dynamic compaction construction method according to claim 1, characterized in that after the rammer is in place, the deviation of the rammer in place is within ± 15cm by using GPS inspection.
4. The dynamic compaction construction method for the high-fill roadbed according to claim 1, 2 or 3, characterized in that after the roadbed is rolled, extra-heavy cone dynamic sounding is adopted to detect the reinforcement depth and the bulk density to detect the compaction degree, thereby reducing the workload of digging a pit and the influence of poor pit depth backfilling effect.
5. The dynamic compaction construction method for the high-fill subgrade according to claim 4, characterized in that during compaction degree detection, 3 typical local parts are selected on site to perform a large-volume density water filling test of the subgrade, the dry density of the subgrade is calculated, and the compaction degree of each test point is calculated; meanwhile, a plurality of exploration pits are uniformly distributed on site, the corrected shot number average value and the variation coefficient of each exploration pit are respectively calculated through an ultra-heavy cone dynamic penetration test, and the compaction degree of each hole is respectively judged; and calculating the weighted average value of the hammering numbers of the dynamic compaction roadbed at the test section, comprehensively judging the compactness of the roadbed at the test section, and judging whether the effective reinforcement depth of the test section meets the design requirement.
6. The method for constructing the dynamic compaction of the high-fill subgrade according to the claim 1, characterized in that for the dynamic compaction section along the line, when the distance between underground pipelines, buildings, structures and other objects and the edge of the dynamic compaction reinforced foundation is less than 15m, a shockproof ditch is dug at the position 5m away from the edge of the dynamic compaction.
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| CN113445521A (en) * | 2021-08-14 | 2021-09-28 | 厦门中建东北设计院有限公司 | High slope construction method by filling soil |
| CN114875884A (en) * | 2022-05-29 | 2022-08-09 | 中国五冶集团有限公司 | Foundation dynamic compaction construction method for high fill of stone pit |
| CN117684541A (en) * | 2024-02-01 | 2024-03-12 | 中大(天津)建设集团有限公司 | High-bearing-capacity foundation construction method |
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