CN112411515A - Method for treating saturated soft soil foundation by stone throwing, silt squeezing and impact rolling - Google Patents
Method for treating saturated soft soil foundation by stone throwing, silt squeezing and impact rolling Download PDFInfo
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- CN112411515A CN112411515A CN202011275666.XA CN202011275666A CN112411515A CN 112411515 A CN112411515 A CN 112411515A CN 202011275666 A CN202011275666 A CN 202011275666A CN 112411515 A CN112411515 A CN 112411515A
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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
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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
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- Engineering & Computer Science (AREA)
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- 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 civil engineering foundation treatment, and particularly relates to a method for treating saturated soft soil foundation by rubble throwing, silt squeezing and impact rolling. Comprises the following steps. S100, digging soil, replacing and filling, including earthwork operation and block stone backfilling; s200-pressing and squeezing silt: s300, filling and throwing the block stones, leveling and compacting the edges of the block stones until a designed filling and throwing elevation is reached: leveling and compacting the stone block edges until the designed throwing and filling elevation is reached; s400-grading sand gravel leveling: after the materials are thrown and filled to the designed height, 100mm thick grading gravel is arranged for leveling, and the surface is collected by static pressure; s500, impact rolling. The treated solid volume rate of the invention reaches more than 83 percent, the foundation bearing capacity is not less than 140kPa, the reaction modulus is not less than 50MN/m, and the load requirement of D-type airplane parking can be met.
Description
Technical Field
The invention belongs to the technical field of civil engineering foundation treatment, and particularly relates to a method for treating saturated soft soil foundation by rubble throwing, silt squeezing and impact rolling.
Background
The main hub airports and trunk airports in China are basically constructed, and in future civil aviation projects, mainly reconstruction and extension projects of the airports basically involve non-navigation-stop construction. The foundation treatment in the non-stop construction of the airport is influenced by the sensitivity of the nearby operating apron, taxiways and the like to the environment, and the selection of the most suitable foundation treatment method is necessary.
At present, the common treatment methods of the saturated soft soil foundation mostly adopt treatment methods such as dynamic compaction or dynamic compaction replacement, compaction piles, stirring piles and the like, but the methods have high equipment and can generate vibration, noise, dust raising and block stone splashing. Airports with high sensitivity requirements are obviously not suitable.
Disclosure of Invention
The invention solves the problems of insufficient bearing capacity, large settlement, large deformation and the like of the saturated soft soil, mucky soil and other foundations with the underground water level of about 0-7m, and provides a method for treating the saturated soft soil foundations by stone throwing, silt squeezing and impact rolling.
The invention adopts the following technical scheme: a method for treating saturated soft soil foundation by rubble-throwing, silt-squeezing and impact rolling comprises the following steps.
S100, digging soil, replacing and filling, including earthwork operation and block stone backfilling;
s200-pressing and squeezing silt:
s300, filling and throwing the block stones, leveling and compacting the edges of the block stones until a designed filling and throwing elevation is reached: leveling and compacting the stone block edges until the designed throwing and filling elevation is reached;
s400-grading sand gravel leveling: after the materials are thrown and filled to the designed height, 100mm thick grading gravel is arranged for leveling, and the surface is collected by static pressure;
s500, impact rolling.
In the step S100, the earthwork operation and the rock block backfilling operation are performed in the same direction, and the earthwork is dug to the bottom of the backfilled earthwork in a backward type at one time.
In the step S200, pressing stones to extrude the silting material: the block stone with the particle size of 60-70 cm is used as a stone pressing and silt squeezing material, and the compressive strength is not less than 20 MPa; and backfilling the rock blocks, performing operation in the same direction as the earthwork operation, and pressing the rock blocks into the soft soil by 60-70 cm in a forward mode.
In the step S300, the block stone filling material: selecting the block stone with the maximum grain size not greater than 60cm, the non-uniformity coefficient Cu not less than 5, the curvature coefficient Cc = 1-3, the compressive strength not less than 20MPa and the mud content not greater than 5% as the throwing filling material.
Step S500 specifically adopts the following method, and uses an impact rolling apparatus to perform impact rolling for 25 times.
S501, when in impact rolling, the road roller firstly runs from one side of the working face to the other side, when reaching the end point, the road roller turns reversely and runs from the center of the line to the starting point, and when reaching the starting point, the road roller turns to the side of the working face to run.
S502, the tractor runs to enable the wheel path of the compaction wheel to be overlapped more than 1/3 so as to ensure that the middle part of the arc-shaped wheel is flushed and ground, and the flushing and grinding are completed when the wheel path of the road roller reaches the other side edge.
S503, controlling the running speed of the impact mill to be 10-15 km/h, preferably 12km/h, controlling the energy of the impact mill to be from low to high, and controlling the number of continuous impact mill passes of each wheel.
And S504, carrying out elevation measurement once every 5 times of impact grinding, recording measurement data, and calculating impact grinding settlement.
And S505, taking the settlement difference of the last 5 times not more than 5mm as a standard for stopping impact rolling.
The underground soil layer is mainly saturated soft soil, and the current common treatment methods of saturated soft soil foundations mostly adopt treatment methods such as dynamic compaction or dynamic compaction replacement, compaction piles, stirring piles and the like, but the methods have high equipment and can generate vibration, noise, dust and block stone splashing. Airports with high sensitivity requirements are obviously not suitable. The method mainly solves the problem of treating the high-water-level soft soil foundation under the condition that the airport does not stop the navigation, and has important popularization and application values and economic values.
Compared with the prior art, the solid volume rate of the treated steel reaches more than 83%, the foundation bearing capacity is not less than 140kPa, the reaction modulus is not less than 50MN/m for heavy planting, and the load requirement of D-type airplane parking can be met.
Detailed Description
A method for treating saturated soft soil foundation by rubble-throwing, silt-squeezing and impact rolling comprises the following steps.
S100, digging soil, replacing and filling, including earthwork operation and block stone backfilling; the earthwork operation and the rock block backfill operation are performed in the same direction, and the earthwork is dug to the bottom of the filling by a backward one-time operation.
S200-pressing and squeezing silt: pressing stones and extruding silt materials: the block stone with the particle size of 60-70 cm is used as a stone pressing and silt squeezing material, and the compressive strength is not less than 20 MPa; and backfilling the rock blocks, performing operation in the same direction as the earthwork operation, and pressing the rock blocks into the soft soil by 60-70 cm in a forward mode.
S300, filling and throwing the block stones, leveling and compacting the edges of the block stones until a designed filling and throwing elevation is reached: leveling and compacting the stone block edges until the designed throwing and filling elevation is reached; and (3) stone throwing and filling material: selecting the block stone with the maximum grain size not greater than 60cm, the non-uniformity coefficient Cu not less than 5, the curvature coefficient Cc = 1-3, the compressive strength not less than 20MPa and the mud content not greater than 5% as the throwing filling material.
S400-grading sand gravel leveling: after the materials are thrown and filled to the designed height, 100mm thick grading gravel is arranged for leveling, and the surface is collected by static pressure;
s500, impact rolling.
Step S500 specifically adopts the following method, using impact rolling equipment to perform impact rolling for 25 times,
s501, when in impact rolling, the road roller firstly runs from one side of the working surface to the other side, when reaching the end point, the road roller turns reversely and runs along the center of the road to the starting point, and when reaching the starting point, the road roller turns to the side of the working surface to run;
s502, the tractor runs to enable the wheel path of the compaction wheel to be overlapped more than 1/3 so as to ensure that the middle part of the arc-shaped wheel is flushed and rolled, and the flushing and rolling are completed when the wheel path of the road roller reaches the edge of the other side;
s503, controlling the running speed of impact rolling to be 10-15 km/h, preferably 12km/h, controlling the energy of impact rolling from low to high, and controlling the number of continuous impact rolling passes of each wheel;
s504, performing elevation measurement once every 5 times of impact grinding, recording measurement data, and calculating impact grinding settlement;
and S505, taking the settlement difference of the last 5 times not more than 5mm as a standard for stopping impact rolling.
Example 1: and carrying out engineering project extension apron bearing capacity requirement on the foundation not less than 140kPa, solid volume rate not less than 80%, foundation reaction modulus not less than 50MN/m and carrying out heavy planting with processing depth of 1.54 m. The average design elevation of the apron surface layer is 779.04m, the average design elevation of the soil substrate is 777.5m, the structural layer is a concrete surface layer of 80cm gravel, 36cm cement stabilized macadam base layer and 38cm, and the total thickness of the structural layer is 1.54 m.
The soil layer of the extension terrace field can be divided into four layers from top to bottom, wherein the first layer is filled with soil and comprises two sub-layers: firstly1The layer is filled with miscellaneous earth2The layer is plain filling soil with the average thickness of 2.05m, the second layer is silty clay with the average thickness of 10.64m, the third layer is silty soil, and the fourth layer is silty clay. The water level burial depth is between 0.7m and 1.2m below the natural groundm, absolute elevation 778.45 m-778.25 m, first aquifer2The bedding elements are filled with soil, and the type of underground water is loose type pore diving.
The underground water level burial depth is about 0-7m, the thickness of pressing stones is 0.6-0.7 m, the replacement and filling thickness is 1.2m, and the purpose of treating saturated soft soil is achieved, wherein the thickness of the treated saturated soft soil is 4-5 m. The volume rate of the treated solid reaches more than 83 percent, the bearing capacity of the foundation is not less than 140kPa, and the reaction modulus is not less than 50MN/m3And the load requirement of D-type airplane parking can be met.
The combined technology of pressing stone and squeezing silt, throwing and filling block stone and impacting and rolling can be adopted to treat the saturated soft soil foundation with higher underground water level and larger thickness for projects such as an airport non-navigation construction station plateau area when the treatment depth is not more than 2 m.
Claims (5)
1. A method for treating saturated soft soil foundation by rubble-throwing, silt-squeezing and impact rolling is characterized in that: comprises the following steps of (a) carrying out,
s100, digging soil, replacing and filling, including earthwork operation and block stone backfilling;
s200-pressing and squeezing silt:
s300, filling and throwing the block stones, leveling and compacting the edges of the block stones until a designed filling and throwing elevation is reached: leveling and compacting the stone block edges until the designed throwing and filling elevation is reached;
s400-grading sand gravel leveling: after the materials are thrown and filled to the designed height, 100mm thick grading gravel is arranged for leveling, and the surface is collected by static pressure;
s500, impact rolling.
2. The method for treating saturated soft soil foundation by means of stone throwing, silt squeezing and impact rolling according to claim 1, wherein the method comprises the following steps: in the step S100, the earthwork operation and the rock block backfilling operation are performed in the same direction, and the earthwork is dug to the bottom of the backfilled earthwork in a backward type at one time.
3. The method for treating saturated soft soil foundation by means of stone throwing, silt squeezing and impact rolling according to claim 2, wherein the method comprises the following steps: in the step S200, pressing stones to extrude the silting material: the block stone with the particle size of 60-70 cm is used as a stone pressing and silt squeezing material, and the compressive strength is not less than 20 MPa; and backfilling the rock blocks, performing operation in the same direction as the earthwork operation, and pressing the rock blocks into the soft soil by 60-70 cm in a forward mode.
4. The method for treating saturated soft soil foundation by means of stone throwing, silt squeezing and impact rolling according to claim 3, wherein the method comprises the following steps: in the step S300, the block stone filling material: selecting the block stone with the maximum grain size not greater than 60cm, the non-uniformity coefficient Cu not less than 5, the curvature coefficient Cc = 1-3, the compressive strength not less than 20MPa and the mud content not greater than 5% as the throwing filling material.
5. The method for treating saturated soft soil foundation by means of stone throwing, silt squeezing and impact rolling according to claim 1, wherein the method comprises the following steps: step S500 specifically adopts the following method, using impact rolling equipment to perform impact rolling for 25 times,
s501, when in impact rolling, the road roller firstly runs from one side of the working surface to the other side, when reaching the end point, the road roller turns reversely and runs along the center of the road to the starting point, and when reaching the starting point, the road roller turns to the side of the working surface to run;
s502, the tractor runs to enable the wheel path of the compaction wheel to be overlapped more than 1/3 so as to ensure that the middle part of the arc-shaped wheel is flushed and rolled, and the flushing and rolling are completed when the wheel path of the road roller reaches the edge of the other side;
s503, controlling the running speed of impact rolling to be 10-15 km/h, preferably 12km/h, controlling the energy of impact rolling from low to high, and controlling the number of continuous impact rolling passes of each wheel;
s504, performing elevation measurement once every 5 times of impact grinding, recording measurement data, and calculating impact grinding settlement;
and S505, taking the settlement difference of the last 5 times not more than 5mm as a standard for stopping impact rolling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011275666.XA CN112411515A (en) | 2020-11-16 | 2020-11-16 | Method for treating saturated soft soil foundation by stone throwing, silt squeezing and impact rolling |
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| CN202011275666.XA CN112411515A (en) | 2020-11-16 | 2020-11-16 | Method for treating saturated soft soil foundation by stone throwing, silt squeezing and impact rolling |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940018529A (en) * | 1993-01-27 | 1994-08-18 | 임철웅 | Construction method of compacted concrete and sand pile in viscous soft ground |
| CN106283944A (en) * | 2016-08-09 | 2017-01-04 | 中电建路桥集团有限公司 | Method for reinforcing shallow soft foundation by pressing and filling rubbles and/or blocks |
| CN108560569A (en) * | 2018-04-26 | 2018-09-21 | 中冶长天国际工程有限责任公司 | A kind of crowded silt fill construction technology of throwing quarrel |
| CN111676951A (en) * | 2020-04-28 | 2020-09-18 | 中国一冶集团有限公司 | Construction method for treating shallow soft soil layer by combining stone throwing, silt squeezing and sand bag well treatment |
-
2020
- 2020-11-16 CN CN202011275666.XA patent/CN112411515A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR940018529A (en) * | 1993-01-27 | 1994-08-18 | 임철웅 | Construction method of compacted concrete and sand pile in viscous soft ground |
| CN106283944A (en) * | 2016-08-09 | 2017-01-04 | 中电建路桥集团有限公司 | Method for reinforcing shallow soft foundation by pressing and filling rubbles and/or blocks |
| CN108560569A (en) * | 2018-04-26 | 2018-09-21 | 中冶长天国际工程有限责任公司 | A kind of crowded silt fill construction technology of throwing quarrel |
| CN111676951A (en) * | 2020-04-28 | 2020-09-18 | 中国一冶集团有限公司 | Construction method for treating shallow soft soil layer by combining stone throwing, silt squeezing and sand bag well treatment |
Non-Patent Citations (2)
| Title |
|---|
| 林晓旭: "抛石挤淤法在市政道路淤泥基础施工中的应用", 《四川水力发电》 * |
| 熊宇璟等: "冲击碾压路基试验检测与分析", 《科技创新与应用》 * |
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Application publication date: 20210226 |