CN112854188A - Soft soil foundation combined surcharge preloading construction method - Google Patents
Soft soil foundation combined surcharge preloading construction method Download PDFInfo
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- CN112854188A CN112854188A CN202110027207.8A CN202110027207A CN112854188A CN 112854188 A CN112854188 A CN 112854188A CN 202110027207 A CN202110027207 A CN 202110027207A CN 112854188 A CN112854188 A CN 112854188A
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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
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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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
Abstract
The utility model relates to a soft soil foundation unites preloading construction method, through adopting this technical scheme, use rubber water bag water injection and pre-compaction, often be close to the water source near soft soil foundation, the water intaking cost is lower, discharge on the spot and drain nearest water source with the water in the water bag after the ballast is accomplished, thereby compare grit surcharge, the cost is practiced thrift and environmental pollution is reduced, dust and sound pollution when having reduced the earthwork transportation promptly, and the construction time cycle is shorter, the efficiency that adopts the water pump to fill the water bag and realize surcharge is far greater than the conveying efficiency who adopts grit surcharge, consequently, it has the progress that has to compare the mode of traditional practical earthwork surcharge.
Description
Technical Field
The application relates to the field of soft soil foundation treatment, in particular to a soft soil foundation combined surcharge preloading construction method.
Background
At present, in the process of coastal city construction, a large amount of soft soil foundations need to be treated. Among them, the vacuum-stacking preloading method is one of the commonly used processing methods, and is developed on the basis of the vacuum preloading method and the stacking preloading method.
The vacuum preloading method uses atmospheric preloading as load, a layer of drainage sand cushion layer is paved on the ground at present, then a plastic drainage plate is inserted by a plate beating machine according to a designed interval, then a layer of to two layers of air-tight sealing films are covered on the plastic drainage plate, then a vacuum pump is used for keeping the water-permeable material at a higher vacuum degree, negative pore water pressure is generated in the pore water of the soil, and the pore water is gradually sucked out, thereby achieving the preloading effect. The preloading method uses a filling layer with a certain thickness as preloading to reinforce the soft soil layer on the site, but has large earthwork amount and long processing time.
The vacuum-preloading combined preloading method can realize quick preloading after the vacuum degree reaches a design value, has better effect than simple vacuum preloading and preloading, but also needs to fill a filling layer with a certain thickness to apply preloading load.
With respect to the related art among the above, the inventors consider that the following drawbacks exist: the traditional mode of filling and piling needs to use motor-driven equipment such as excavators, bulldozers, graders and road rollers and a large amount of earthwork, and a large amount of dust can be generated in the long-term construction process, so that the influence on the surrounding environment is large; and the construction period of the motor equipment soil piling is longer, and an available waste soil site needs to be searched during the later period of waste soil, so that a plurality of adverse factors exist. There is therefore room for improvement.
Disclosure of Invention
In order to reduce the cost, the time period and the influence on the environment of soft foundation treatment, the application provides a soft soil foundation combined surcharge preloading construction method.
The application provides a soft soil foundation combined surcharge preloading construction method which adopts the following technical scheme:
a soft soil foundation combined surcharge preloading construction method comprises the following steps:
the method comprises the following steps: cleaning a construction site, and paving a sand cushion layer on the ground surface;
step two: arranging a drainage plate, and constructing an annular sealing wall around the block to be reinforced;
step three: burying a strainer in the sand cushion layer, wherein the strainer is communicated with a vacuum pump;
step four: laying a sealing film which completely covers the block on the upper surface of the block to be reinforced, and laying a geotechnical non-woven fabric which completely covers the sealing film above the sealing film;
step five: starting a vacuum pump to vacuumize a block to be reinforced below the sealing film;
step six: first-stage stacking; performing primary stacking loading above the geotechnical harmless cloth after vacuumizing, wherein the primary stacking loading adopts sandstone stacking loading;
step seven: second-stage stacking; performing secondary stacking above the primary stacking, wherein the secondary stacking comprises a plurality of rubber water bags which are laid side by side and are filled with water, and adjacent rubber water bags are attached to each other;
step eight: grading and unloading; and after ballasting is carried out to reach the design strength, sequentially unloading the secondary stacking load and the primary stacking load, carrying out general tamping treatment on the block to be reinforced, and then rolling and flattening the field to complete the soft soil foundation treatment construction operation.
Through adopting above-mentioned technical scheme, the sand cushion layer is used for keeping apart the soft soil foundation and is used for burying the strainer underground, utilizes the water permeability of sand cushion layer to when the evacuation, atmospheric pressure leads to the sand cushion layer with the water in the soft soil foundation through the drain bar water conservancy diversion, recycles the negative pressure in the strainer and derives water outside the soft soil foundation along the strainer, realizes the precipitation to the soft soil foundation. The sealing film is used for forming a sealing space for the soft soil foundation below in cooperation with the enclosed sealing cavity, so that water in the soft soil foundation can be discharged along the drainage plate when the region is vacuumized. The effect of geotechnique's non-woven fabrics is protected the seal membrane, causes destruction to the seal membrane when avoiding piling up the grit, influences sealing performance. Wherein, the first-stage stacking load plays a role of evenly spreading the pressure of the second-stage stacking load, and the pre-pressing pressure mainly comes from the second-stage load, namely the water bag pre-pressing. Wherein use rubber water bag water injection and pre-compaction, be close to the water source near soft soil foundation often, the water intaking cost is lower, water in the water bag discharges on the spot and drains nearest water source after the ballast is accomplished, thereby compare the grit surcharge, the cost is practiced thrift and environmental pollution is reduced, dust and sound pollution when having reduced the earthwork transportation promptly, and the construction time cycle is shorter, the efficiency that adopts the water pump to fill the water bag and realize the surcharge is far more than the transport efficiency who adopts the grit surcharge, consequently, it has the progress that is showing to compare the mode of traditional practical earthwork surcharge.
Preferably, the method further comprises the following steps between the sixth step and the seventh step: the position of each rubber water bag and a dividing line between adjacent rubber water bags are planned in advance according to the size of the rubber water bags, a pressure bearing part is placed on the dividing line, and the rubber water bags are pressed above the pressure bearing part.
By adopting the technical scheme, the rubber water bag has certain plasticity and toughness, so the edge of the rubber water bag is in an arc shape after the rubber water bag is filled with water, and the soft soil foundation at the position of the dividing line between the adjacent rubber water bags is easy to be underloaded. Therefore, the pressure-bearing part is placed at the parting line position, the rubber water bag is pressed on the pressure-bearing part, and then the pressure-bearing part is used for ballasting the soft soil foundation below, so that the ballast of the underloaded part is realized, and the integral dewatering and bearing requirements of the soft soil foundation block are favorably improved.
Preferably, the pressure-bearing member includes an arc-shaped bottom plate for applying pressure to the water bag, and an arc opening of the bottom plate is upwardly arranged.
Through adopting above-mentioned technical scheme, the convex bottom plate and the ground surface contact of pressure-bearing piece, and the family mouth of bottom plate sets up, and the rubber water bag is pressed in the bottom plate top, utilizes the deformation of bottom plate and the warpage of arc mouth department, becomes the pressure of bottom plate to below soft soil foundation with the gravity transmission of water bag to be favorable to improving the ballast to the soft soil foundation of underload part.
Preferably, a vertically arranged partition plate is fixed in the middle of the upper end face of the bottom plate, and a horizontal supporting plate for loading a counterweight is fixed at the top end of the partition plate.
Through adopting above-mentioned technical scheme, the vertical fixed baffle in bottom plate middle part is used for supporting the layer board of top, and the effect of layer board is used for increasing and bears the weight-bearing to when the ballast pressure of the soft soil foundation of pressure-bearing piece below is still not enough, can pile counter weights such as water bag again above the layer board, ensure that the soft soil foundation of pressure-bearing piece below can satisfy the ballast requirement.
Preferably, the top end of the drainage plate is embedded in the sand cushion layer and is lower than the sealing film.
By adopting the technical scheme, the sealing film is prevented from being punctured by the drainage plate during vacuum pumping.
Preferably, the counterweight can be a rubber water bag.
Through adopting above-mentioned technical scheme, adopt the rubber water bag can practice thrift the time and the cost of choosing the counter weight, more water bag in job site can directly take.
Preferably, the bottom plate and the supporting plate are both communicated with measuring holes which are arranged just opposite to each other, and measuring scales inserted with the land of the block to be reinforced are arranged in the measuring holes in a penetrating mode.
Through adopting above-mentioned technical scheme, the measuring aperture is used for supplying the dipperstick to pass, and the dipperstick is vertical to be inserted and to be established on the ground, is equipped with the scale on the dipperstick to can observe ballasted whole effect at the settlement of ballast in-process contrast pressure-bearing piece.
Preferably, the sealing wall in the second step comprises double rows of slurry stirring piles, and adjacent slurry stirring piles are meshed with each other.
Through adopting above-mentioned technical scheme, the sealed wall adopts the mutual interlock of double mud stirring stake to form, relies on the stirring stake to consolidate soft foundation on the one hand at soft soil foundation, and the stirring stake of the mutual interlock of on the other hand has stronger stagnant water and sealed effect, can keep the leakproofness of the soft soil foundation of seal membrane below.
In summary, the present application includes at least one of the following beneficial technical effects:
1. through setting up the one-level surcharge and carry, play the effect of the pressure of equalling divide the second grade surcharge, the pressure of pre-compaction mainly derives from the second grade load, the water bag pre-compaction promptly. The water bag is filled by the water pump, so that the stacking efficiency is far higher than the transportation efficiency of sand stacking, and the construction period is shortened;
2. the edges of the rubber water bags are arc-shaped after the rubber water bags are filled with water, so that the soft soil foundation at the dividing line position between the adjacent rubber water bags is easy to underload. The pressure-bearing part is arranged between the adjacent rubber water bags, the rubber water bags are pressed on the pressure-bearing part, and the soft soil foundation below the pressure-bearing part is ballasted through the pressure-bearing part, so that the ballast is supplemented to the underloaded part, and the treatment effect on the soft soil foundation is improved;
3. be used for supplying the dipperstick to pass through setting up the measuring orifice, the dipperstick is vertical to be inserted and to be established on the ground, is equipped with the scale on the dipperstick to can be at the settlement of ballast in-process contrast pressure-bearing spare, observe ballasted whole effect.
Drawings
FIG. 1 is a schematic view of the overall structure of embodiment 1 of the present application;
FIG. 2 is a schematic view of the overall structure of embodiment 2 of the present application;
fig. 3 is an enlarged view at a in fig. 2.
Description of reference numerals: 1. a sand cushion layer; 2. sealing the wall; 3. a water filter pipe; 4. a vacuum pump; 5. first-stage stacking; 6. a water bag; 7. a pressure-bearing member; 71. a base plate; 72. a partition plate; 73. a support plate; 8. measuring a scale; 9. soft soil foundation.
Detailed Description
The present application is described in further detail below with reference to figures 1-3.
Example 1:
as shown in fig. 1, embodiment 1 of the present application discloses a soft soil foundation 9 combined surcharge preloading construction method, including the following steps:
the method comprises the following steps: cleaning a construction site, and paving a sand cushion layer 1 on the ground surface; the thickness of the sand cushion layer 1 can be 30-60 cm of gravel.
Step two: arranging a drainage plate, inserting the drainage plate into a soft soil foundation 9 through the sand cushion layer 1, and constructing an annular sealing wall 2 around the block to be reinforced; the sealing wall 2 comprises double rows of mud stirring piles, and adjacent mud stirring piles are mutually meshed to realize water stopping and sealing. The construction of the sealing wall 2 while the drainage plate is arranged is beneficial to improving the overall construction speed and shortening the period.
Step three: embedding a strainer 3 in the sand cushion layer 1, wherein the strainer 3 is communicated with a vacuum pump 4; be provided with the filter pulp in the strainer 3 to only make rivers see through, form the negative pressure through vacuum pump 4 in strainer 3, and then take out the water in the soil layer.
Step four: laying a sealing film which completely covers the block on the upper surface of the block to be reinforced, and laying a geotechnical non-woven fabric which completely covers the sealing film above the sealing film; the geotextile is used for protecting the sealing film and avoiding being loaded and crushed by the sandstone. The non-woven geotextile is constructed by adopting a method of manual laying and mechanical assistance. The non-woven geotextile is spliced on site by adopting a hand-held industrial sewing machine and is sewed by adopting an over-stitch or over-stitch mode. And (3) sewing the non-woven geotextile on the vacuum film into a large non-woven geotextile with the size meeting the requirement, sequentially paving the large non-woven geotextile according to the selected direction, wherein the sewing width of the non-woven geotextile is more than or equal to 20cm, informing a field supervision engineer to carry out acceptance after the paving is finished, and carrying out next procedure construction after the acceptance is qualified. When the non-woven geotextile is laid, the proper shrinkage rate is considered, the proper tightness and smoothness are required, and no wrinkles are required, so that the close combination of the non-woven geotextile and the vacuum film is ensured. The non-woven geotextile should be protected from ultraviolet radiation during the laying process. After the paving, the construction of the heaping and carrying soil should be carried out in time, or protection and covering measures should be taken to prevent aging.
Step five: starting a vacuum pump 4 to vacuumize a block to be reinforced below the sealing film, wherein accumulated water in the soft soil foundation 9 can be pumped out from the water filtering pipe 3 in the process;
step six: primary stacking and loading 5; performing primary stacking loading 5 on the geotechnical harmless cloth after vacuumizing for 15 days, wherein the primary stacking loading 5 adopts sandstone stacking loading;
step seven: second-stage stacking; a second-level stacking is carried out above the first-level stacking 5, the second-level stacking comprises a plurality of rubber water bags 6 which are laid side by side and are filled with water, and the adjacent rubber water bags 6 are arranged in a bonding mode;
step eight: grading and unloading; and after ballasting is carried out to reach the design strength, sequentially unloading the secondary stacking load and the primary stacking load 5, carrying out general tamping treatment on the block to be reinforced, and rolling and flattening the field to complete the soft soil foundation 9 treatment construction operation.
Wherein the material requirements are as follows:
1) the adopted geotextile material cannot adopt reclaimed materials.
2) The geosynthetics used in the engineering are required to be provided with delivery certification or a certificate of eligibility and a sampling test report, the quality and mechanical indexes of the geotextile are inspected through a supervision sampling test before use, and all technical specification indexes are required to meet the design requirements. After the supervision and approval, the user can use the product.
3) The product can not be used for the product with unknown production date or with storage period of more than 6 months or with aging phenomenon or breakage.
4) Before manufacturing, the geotextile should be checked in detail for no holes, damage and aging, and all the obvious uneven density and aging of the warps and the wefts in appearance can not be used.
5) The temporary piling in the construction site needs to select a storehouse or a place with good protection conditions to prevent sunshine. Geotextile raw material and finished product thereof are strictly prevented from being stacked under strong light
In order to protect the vacuum sealing film and facilitate the transportation of the small-sized dump truck, a channel is firstly built in the region before the stacking construction. Construction of the position of the overpressure membrane ditch: firstly, manually filling sand bags with the thickness of 1m on two sides of the film pressing ditch, placing assembled steel beams on the sand bags to form a 6m wide passage, and adopting handrails to make two-side protection. Then, the sand is transported to the region by a small excavator and a dumper to construct an access road. In the field, an excavator or a bulldozer is used for carrying, spreading and leveling the carrying soil. After sand is piled to form a certain working surface and thickness, an excavator, a bulldozer and a dump truck can enter the range of the sealing membrane for operation, so that the sealing membrane is prevented from being crushed.
In the process of stacking construction, the monitoring data is communicated with a third-party monitoring unit closely, the condition of the monitoring data is known, the construction quality is guaranteed, if the monitoring data is abnormal in the process of stacking, construction is stopped immediately, the reason is found, and the stacking construction can be continued after the problem is solved.
The processing of the water bag comprises the following steps:
1. acceptance of Water bag
After the water bag enters a field, in order to test the safety of the water bag, a safety test needs to be carried out on the water bag, and 2 schemes are provided: firstly, inflation, namely, the maximum tension of the material of the water bag generated by inflation pressure is not less than 1.2 times of the maximum tension of the material in the actual working state through inflation simulation according to the stress state of the water bag during working; secondly, directly injecting water to test the safety of the working state; the first mode is simple and quick, and the second effect is more direct, objective and real.
2. Water bag positioning
In order to ensure that the subsequent water bag can be tightly adhered after being filled with water, the water bag is positioned firstly, then the water bag is placed, the positioning of the water bag mainly adopts the control of the distance between the valves of the adjacent water bags, and the positions of the water bags are drawn by using tools such as a tape measure, lime and the like, so that the water bags are ensured to be neatly drawn.
3. 6 spreading with water
The water bag has no big wrinkles, especially the bottom and the end of the water bag, and smoothness is ensured, so that the appearance of the water bag after later water injection is not influenced, the safety of the water bag is directly reduced, and the process can be assisted by a fan.
4. Water bag water injection
The water bag is paved to the position to carry out water injection operation, and the water is loaded in a grading way according to requirements, wherein the key point of the water injection construction is to pay attention to the state of the water bag, and once abnormity occurs, the water is turned off in time. The water bag is loaded by using an 11kw high-pressure submersible pump, one water bag can be filled in about one hour by averaging one water pump, the water filling speed of the water bag is required to be carried out according to design requirements, the water filling speed can be directly controlled by controlling the water filling height, the water filling height of the water bag in the test section is 2.5m, the water filling is carried out for 4 times, namely the water filling height is 50cm, 1m, 1.5m and 2.5m respectively, the interval of water filling is 24 hours each time, and various monitoring data are measured in time.
5. Edge treatment
Because the water bag is oval under the influence of water gravity after the water injection, lead to four corners of water bag to be the arc angle, appear having the gap between the adjacent water bag, be unfavorable for the wholeness of soft base pre-compaction, in order to compensate pre-compaction vacuum area, can adopt the treatment of piling up the sand bag at the gap position, realize equivalent load.
6. Unloading of water bags
After the unloading requirement is met, the water in the water bag is discharged to a designated position by connecting the water pipe, and then the water bag is packed and stacked.
Example 2:
the present embodiment is different from embodiment 1 in that:
as shown in fig. 2 to 3, the following steps are further included between step six and step seven: the position of each rubber water bag 6 and a dividing line between adjacent rubber water bags 6 are planned according to the size of the rubber water bags 6 in advance, a pressure-bearing piece 7 is placed on the dividing line, and the rubber water bags 6 are pressed above the pressure-bearing piece 7. The pressure-bearing piece 7 comprises a circular arc-shaped bottom plate 71 used for pressing the water bag 6, and the arc opening of the bottom plate 71 is arranged upwards, so that when the rubber water bag 6 is pressed on the bottom plate 71, the pressure applied to the soft soil foundation 9 below the circular arc-shaped bottom plate 71 is larger, and the problem of underload is favorably solved.
A vertically arranged partition plate 72 is fixed in the middle of the upper end face of the bottom plate 71, the partition plate 72 is parallel to the dividing line, a horizontal support plate 73 for placing a counterweight is fixed at the top end of the partition plate 72, the counterweight can be a water bag 6 in a construction site, and after the pressure-bearing member 7 is installed in field operation, the water bag 6 or a sand bag is placed above the support plate 73 of the pressure-bearing member 7, so that the ballast of an underload part between adjacent rubber water bags 6 is improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (8)
1. A soft soil foundation combined surcharge preloading construction method is characterized in that: the method comprises the following steps:
the method comprises the following steps: cleaning a construction site, and paving a sand cushion (1) on the ground surface;
step two: arranging a drainage plate, and constructing an annular sealing wall (2) around the block to be reinforced;
step three: burying a water filter pipe (3) in the sand cushion layer (1), wherein the water filter pipe (3) is communicated with a vacuum pump (4);
step four: laying a sealing film which completely covers the block on the upper surface of the block to be reinforced, and laying a geotechnical non-woven fabric which completely covers the sealing film above the sealing film;
step five: starting a vacuum pump (4) to vacuumize a block to be reinforced below the sealing film;
step six: primary stacking (5); performing primary stacking loading (5) above the geotechnical harmless cloth after vacuumizing, wherein the primary stacking loading (5) adopts sandstone stacking loading;
step seven: second-stage stacking; a second-level stacking is carried out above the first-level stacking (5), the second-level stacking comprises a plurality of rubber water bags (6) which are laid side by side and are filled with water, and adjacent rubber water bags (6) are arranged in a bonding mode;
step eight: grading and unloading; and after ballasting is carried out to reach the design strength, sequentially unloading the secondary stacking load and the primary stacking load (5), carrying out general tamping treatment on the block to be reinforced, and rolling and flattening the field to complete the soft soil foundation (9) treatment construction operation.
2. The soft soil foundation combined surcharge preloading construction method according to claim 1, characterized in that: the method also comprises the following steps between the sixth step and the seventh step: the position of each rubber water bag (6) and a dividing line between adjacent rubber water bags (6) are planned in advance according to the size of each rubber water bag (6), a pressure bearing part (7) is placed on the dividing line, and the rubber water bags (6) are pressed above the pressure bearing part (7).
3. The soft soil foundation combined surcharge preloading construction method according to claim 2, characterized in that: the pressure-bearing part (7) comprises a circular arc-shaped bottom plate (71) used for pressing the water bag (6), and an arc opening of the bottom plate (71) is arranged upwards.
4. The soft soil foundation combined surcharge preloading construction method according to claim 1, characterized in that: a vertically arranged partition plate (72) is fixed in the middle of the upper end face of the bottom plate (71), and a horizontal supporting plate (73) used for containing a counterweight is fixed at the top end of the partition plate (72).
5. The soft soil foundation combined surcharge preloading construction method according to claim 1, characterized in that: the top end of the drainage plate is embedded in the sand cushion layer (1) and is lower than the sealing film.
6. The soft soil foundation combined surcharge preloading construction method according to claim 4, characterized in that: the counterweight can be a rubber water bag (6).
7. The soft soil foundation combined surcharge preloading construction method according to claim 1, characterized in that: the bottom plate (71) and the supporting plate (73) are both communicated with measuring holes which are arranged just opposite to each other, and measuring scales (8) inserted with the land of the block to be reinforced penetrate through the measuring holes.
8. The soft soil foundation combined surcharge preloading construction method according to claim 1, characterized in that: and in the second step, the sealing wall (2) comprises double rows of slurry stirring piles, and adjacent slurry stirring piles are meshed with each other.
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| CN202110027207.8A CN112854188A (en) | 2021-01-09 | 2021-01-09 | Soft soil foundation combined surcharge preloading construction method |
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| CN202110027207.8A CN112854188A (en) | 2021-01-09 | 2021-01-09 | Soft soil foundation combined surcharge preloading construction method |
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| CN112854188A true CN112854188A (en) | 2021-05-28 |
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| CN113914292A (en) * | 2021-10-14 | 2022-01-11 | 温州市渣土利用开发股份有限公司 | Vacuum combined surcharge preloading foundation treatment method |
| CN114032875A (en) * | 2021-12-14 | 2022-02-11 | 广东省源天工程有限公司 | Sand layer sludge overload prepressing device and method for soft soil foundation |
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