CN112281797A - Construction method for foundation dynamic compaction test - Google Patents
Construction method for foundation dynamic compaction test Download PDFInfo
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- CN112281797A CN112281797A CN202011278368.6A CN202011278368A CN112281797A CN 112281797 A CN112281797 A CN 112281797A CN 202011278368 A CN202011278368 A CN 202011278368A CN 112281797 A CN112281797 A CN 112281797A
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- dynamic compaction
- ramming
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Soil Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a construction method of a foundation dynamic compaction test, which comprises the steps of construction preparation work, site leveling, measurement positioning paying-off, elevation recording, ramming hammer falling, detection effect, data arrangement and pushing leveling. The invention has the beneficial effects that: verifying the feasibility of the dynamic compaction reinforcement treatment of the project; determining the optimal ramming energy and the optimal ramming hammer number through trial ramming; determining the effective reinforcing depth of dynamic compaction; determining the corresponding tamping times through tests, and determining the optimal combination of the machines to ensure that the construction efficiency of the machines is optimal; and determining final construction parameters of dynamic compaction through detecting the foundation bearing capacity of the dynamic compaction test area, and taking the parameters as the basis and experience parameters of subsequent field construction after the parameters are approved by a supervision engineer so as to guide the comprehensive dynamic compaction construction and achieve the design quality standard.
Description
Technical Field
The invention relates to a foundation dynamic compaction test, in particular to a construction method of the foundation dynamic compaction test, belonging to the technical field of engineering foundation detection.
Background
The foundation refers to the soil or rock mass of the supporting foundation under the building. Soil layers as building foundations are divided into rocks, gravel soil, sandy soil, silt soil, cohesive soil and artificial filling soil. The foundation includes a natural foundation and an artificial foundation (composite foundation). Natural foundations are layers of natural soil that do not require human reinforcement. The artificial foundation needs to be reinforced by people, the artificial foundation is usually filled with a stone chip cushion layer, a sand cushion layer and mixed lime-soil, and then tamped, and the like, and during building construction, dynamic compaction of the foundation needs to be ensured to reduce settlement deformation of the foundation, so that a dynamic compaction test needs to be performed on the foundation before building construction is performed, and based on the method, the construction method for the foundation dynamic compaction test is provided.
Disclosure of Invention
The invention aims to provide a construction method for a foundation dynamic compaction test to solve the problems.
The invention realizes the purpose through the following technical scheme: a construction method for a foundation dynamic compaction test comprises the following steps:
firstly, construction preparation work is carried out, test participants are determined, and a test construction machine and a measuring device are prepared;
secondly, leveling the field, cleaning and leveling organic matters such as garbage, weeds, tree roots and the like in the field before trial tamping, and excavating a drainage ditch to facilitate drainage in the field;
measuring positioning pay-off and elevation records, positioning pay-off is carried out on the selected field to plan an operation area, and measurement records are carried out on the pay-off area and the mark of the selected operation area by adopting prepared measurement equipment;
step four, a rammer is dropped, and a 12t recombination type rammer machine is selected to carry out full-beat ramming in an operation area;
measuring the depths of a plurality of positions of the rammed pits in the operation area, and calculating an average value to obtain the average depth of the inner rammed pits;
step six, data arrangement, namely compiling, collecting and arranging measurement data records and result analysis records generated in the test process;
and seventhly, pushing and leveling, namely digging up the tested operation area by using an excavator, and leveling the ground by using a bulldozer.
As a still further scheme of the invention: in the first step, the test participants comprise: supervision unit: supervision engineers, on-site full-time supervision engineers; construction unit personnel: technical responsibility, quality and safety responsibility; laboratory test personnel.
As a still further scheme of the invention: in the first step, the test construction machine includes: crawler crane, bull-dozer, ram, excavator, measuring equipment includes: total powerstation, surveyor's level, dull and stereotyped load check out test set.
As a still further scheme of the invention: in the fourth step, a circular cast steel hammer with the hammer bottom diameter of 2.5m is selected, the lifting height of the rammer is determined according to the weight of the dynamic compactor, and the specific calculation formula is as follows:
the drop distance (h) is 1000KN · m (or experimentally determined energy)/weight per click design energy.
＝1000KN·m÷(12000kg×9.8m/s)
＝8.5m。
As a still further scheme of the invention: in the fourth step, the rammer is rammed 3 times, one-time ramming is carried out, the ramming energy is 1000KN, and the rammer is printed and overlapped with 1/4 hammers.
As a still further scheme of the invention: and in the fourth step, dynamic compaction records need to be filled in time when the rammer is used for dynamic compaction, and the serial number of the rammer needs to be recorded in the ramming records, and the ramming settlement of each rammer at each ramming point and the average penetration amount of the last two ramming points need to be accurately recorded.
As a still further scheme of the invention: the average penetration amount of the last two strokes of the rammer ranges from 40 mm to 50 mm.
The invention has the beneficial effects that: the construction method of the foundation dynamic compaction test is reasonable in design, and the feasibility of dynamic compaction reinforcement treatment of the project is verified; determining the optimal ramming energy and the optimal ramming hammer number through trial ramming; determining the effective reinforcing depth of dynamic compaction; determining the corresponding tamping times through tests, and determining the optimal combination of the machines to ensure that the construction efficiency of the machines is optimal; and determining final construction parameters of dynamic compaction through detecting the foundation bearing capacity of the dynamic compaction test area, and taking the parameters as the basis and experience parameters of subsequent field construction after the parameters are approved by a supervision engineer so as to guide the comprehensive dynamic compaction construction and achieve the design quality standard.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
Referring to fig. 1, a construction method for a foundation dynamic compaction test includes the following steps:
firstly, construction preparation work is carried out, test participants are determined, and a test construction machine and a measuring device are prepared;
secondly, leveling the field, cleaning and leveling organic matters such as garbage, weeds, tree roots and the like in the field before trial tamping, and excavating a drainage ditch to facilitate drainage in the field;
measuring positioning pay-off and elevation records, positioning pay-off is carried out on the selected field to plan an operation area, and measurement records are carried out on the pay-off area and the mark of the selected operation area by adopting prepared measurement equipment;
step four, a rammer is dropped, and a 12t recombination type rammer machine is selected to carry out full-beat ramming in an operation area;
measuring the depths of a plurality of positions of the rammed pits in the operation area, and calculating an average value to obtain the average depth of the inner rammed pits;
step six, data arrangement, namely compiling, collecting and arranging measurement data records and result analysis records generated in the test process;
and seventhly, pushing and leveling, namely digging up the tested operation area by using an excavator, and leveling the ground by using a bulldozer.
Further, in the embodiment of the present invention, in the first step, the trial participants include: supervision unit: supervision engineers, on-site full-time supervision engineers; construction unit personnel: technical responsibility, quality and safety responsibility; laboratory test personnel.
Further, in an embodiment of the present invention, in the first step, the testing the construction machine includes: crawler crane, bull-dozer, ram, excavator, measuring equipment includes: total powerstation, surveyor's level, dull and stereotyped load check out test set.
Further, in the fourth step of the present invention, a circular cast steel hammer with a hammer bottom diameter of 2.5m is selected, and the lifting height of the rammer is determined according to the weight of the dynamic compactor, and the specific calculation formula is as follows:
the drop distance (h) is 1000KN · m (or experimentally determined energy)/weight per click design energy.
＝1000KN·m÷(12000kg×9.8m/s)
＝8.5m。
Further, in the fourth step of the present invention, the number of rammer strokes is 3, one rammer stroke is full of 1000KN, and the rammer mark overlaps 1/4 hammers.
Furthermore, in the fourth step of the present invention, a dynamic compaction record needs to be filled in time when the ram is used for dynamic compaction, and a number of the rammer needs to be recorded in the ramming record, and a ramming settlement amount of each ramming point and an average penetration amount of the last two ramming points need to be accurately recorded.
Further, in the embodiment of the invention, the average penetration amount of the rammer in the last two strokes ranges from 40 mm to 50 mm.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A construction method for a foundation dynamic compaction test is characterized by comprising the following steps: the method comprises the following steps:
firstly, construction preparation work is carried out, test participants are determined, and a test construction machine and a measuring device are prepared;
secondly, leveling the field, cleaning and leveling organic matters such as garbage, weeds, tree roots and the like in the field before trial tamping, and excavating a drainage ditch to facilitate drainage in the field;
measuring positioning pay-off and elevation records, positioning pay-off is carried out on the selected field to plan an operation area, and measurement records are carried out on the pay-off area and the mark of the selected operation area by adopting prepared measurement equipment;
step four, a rammer is dropped, and a 12t recombination type rammer machine is selected to carry out full-beat ramming in an operation area;
measuring the depths of a plurality of positions of the rammed pits in the operation area, and calculating an average value to obtain the average depth of the inner rammed pits;
step six, data arrangement, namely compiling, collecting and arranging measurement data records and result analysis records generated in the test process;
and seventhly, pushing and leveling, namely digging up the tested operation area by using an excavator, and leveling the ground by using a bulldozer.
2. The construction method of the foundation dynamic compaction test according to claim 1, characterized in that: in the first step, the test participants comprise: supervision unit: supervision engineers, on-site full-time supervision engineers; construction unit personnel: technical responsibility, quality and safety responsibility; laboratory test personnel.
3. The construction method of the foundation dynamic compaction test according to claim 1, characterized in that: in the first step, the test construction machine includes: crawler crane, bull-dozer, ram, excavator, measuring equipment includes: total powerstation, surveyor's level, dull and stereotyped load check out test set.
4. The construction method of the foundation dynamic compaction test according to claim 1, characterized in that: in the fourth step, a circular cast steel hammer with the hammer bottom diameter of 2.5m is selected, the lifting height of the rammer is determined according to the weight of the dynamic compactor, and the specific calculation formula is as follows:
the drop distance (h) is 1000KN m (or the energy determined by the test)/the weight of the hammer, namely the single-click design energy;
＝1000KN·m÷(12000kg×9.8m/s)
＝8.5m。
5. the construction method of the foundation dynamic compaction test according to claim 1, characterized in that: in the fourth step, the rammer is rammed 3 times, one-time ramming is carried out, the ramming energy is 1000KN, and the rammer is printed and overlapped with 1/4 hammers.
6. The construction method of the foundation dynamic compaction test according to claim 1 or 5, wherein: and in the fourth step, dynamic compaction records need to be filled in time when the rammer is used for dynamic compaction, and the serial number of the rammer needs to be recorded in the ramming records, and the ramming settlement of each rammer at each ramming point and the average penetration amount of the last two ramming points need to be accurately recorded.
7. The construction method of the foundation dynamic compaction test according to claim 6, wherein the construction method comprises the following steps: the average penetration amount of the last two strokes of the rammer ranges from 40 mm to 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011278368.6A CN112281797A (en) | 2020-11-16 | 2020-11-16 | Construction method for foundation dynamic compaction test |
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| CN202011278368.6A CN112281797A (en) | 2020-11-16 | 2020-11-16 | Construction method for foundation dynamic compaction test |
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| CN112281797A true CN112281797A (en) | 2021-01-29 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261211A (en) * | 2019-07-17 | 2019-09-20 | 中冶沈勘工程技术有限公司 | The thin sight visible model testing device and method of forced ramming reinforcing saturated sand foundation |
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- 2020-11-16 CN CN202011278368.6A patent/CN112281797A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261211A (en) * | 2019-07-17 | 2019-09-20 | 中冶沈勘工程技术有限公司 | The thin sight visible model testing device and method of forced ramming reinforcing saturated sand foundation |
Non-Patent Citations (1)
| Title |
|---|
| 祥福铺的店: "《https://wenku.baidu.com/view/ad3817282dc58bd63186bceb19e8b8f67d1cef6f.html》", 17 October 2019, 百度文库 * |
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Application publication date: 20210129 |