CN113356176A - Soft foundation treatment method - Google Patents
Soft foundation treatment method Download PDFInfo
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- CN113356176A CN113356176A CN202110802766.1A CN202110802766A CN113356176A CN 113356176 A CN113356176 A CN 113356176A CN 202110802766 A CN202110802766 A CN 202110802766A CN 113356176 A CN113356176 A CN 113356176A
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011282 treatment Methods 0.000 title claims abstract description 16
- 239000002689 soil Substances 0.000 claims abstract description 40
- 238000013461 design Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 11
- 238000009825 accumulation Methods 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 6
- 239000004576 sand Substances 0.000 claims description 20
- 239000011435 rock Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 14
- 238000010276 construction Methods 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 12
- 239000004927 clay Substances 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 6
- 238000007373 indentation Methods 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 238000009792 diffusion process Methods 0.000 claims description 3
- 238000005429 filling process Methods 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 3
- 239000000758 substrate Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000008719 thickening Effects 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011328 necessary treatment Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- 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)
- Road Paving Structures (AREA)
Abstract
The invention relates to the technical field of foundation treatment, and particularly discloses a soft foundation treatment method; an isosceles trapezoid groove is excavated on the landscape foundation, and the landscape foundation is arranged in the center of the isosceles trapezoid groove; backfilling the two sides of the landscape foundation layer by layer, tamping by using a mechanical tamping machine, tamping for 5-6 times, tamping for half and tamping back and forth when the tamping machine moves, and backfilling when the impression of the previous time and the impression of the next time are observed within 1mm by eyes; repeating the process for the next layer until the filling design elevation is changed; when the landscape foundation is positioned in the water accumulation area, the soft plastic soil layer is shallow and can shovel off the soft plastic layer soil, the lower layer of the hard soil layer which is not stirred is exposed, and the cushion layer is thickened; the invention solves the problems that when the landscape structure foundation is placed in a deep backfill region of early engineering activities, the deep backfill region has long tamping period and higher project cost, and the landscape foundation is difficult to build in a water accumulation region.
Description
Technical Field
The application relates to the technical field of foundation treatment, and particularly discloses a soft foundation treatment method.
Background
After the project engineering is built or the main body is finished, the landscape structure is constructed; when the landscape foundation is placed in a deep backfill region of early engineering activities, the soil filling of the deep backfill region is soft, and the foundation of the landscape foundation needs to be subjected to necessary treatment; the deep backfill area has long tamping construction period and higher project cost; when the landscape structure foundation is positioned in the water accumulation area, the foundation is in a soft plastic state to form rubber soil; the landscape foundation is difficult to build in the ponding area.
In view of the above, the present invention provides a method for treating soft foundation, so as to solve the above problems.
Disclosure of Invention
The invention aims to provide a soft foundation treatment method, which aims to solve the problems that when the foundation of a landscape structure is placed in a deep backfill region of early engineering activities, the tamping period of the deep backfill region is long, the project cost is high, and the landscape foundation is difficult to build in a water accumulation region.
In order to achieve the above object, a basic aspect of the present invention provides a soft foundation treatment method, including the steps of;
when the landscape foundation is arranged in a deep backfill and replacement area of an early engineering activity, step 101, an isosceles trapezoid groove is dug in the landscape foundation, and the landscape foundation is arranged in the center of the isosceles trapezoid groove; 102, replacing and filling the two sides of the landscape foundation layer by layer, wherein the replacing and filling materials are coarse sand, a proper-gradation sand-pebble coarse sand mixture and plain soil; 103, tamping and replacing the filling layer by using a mechanical tamping machine, tamping, semi-tamping, and tamping for 5-6 times back and forth when the tamping machine moves, and loosely filling the next layer when the indentation of the previous time and the indentation of the next time are within 1mm by observing by eyes; repeating the process for the next layer until the filling design elevation is changed; 104, arranging a surface cushion layer above the backfill layer; 105, when the tamping operation passes are consistent as the same as the filling material, only in the first filling position, a qualified static sounding unit is entrusted by a project construction unit or a construction party to perform static sounding detection;
when the landscape foundation is located in the water accumulation area, aiming at a shallow soft plastic-shaped soil layer, step 201, shoveling the soft plastic layer soil and exposing a lower layer of unstirred hard soil layer; step 202, arranging a thickened cushion layer on a hard soil layer;
when water is accumulated on a deeper soft plastic soil layer or the surface, step 301, selecting the size of the block stone according to the thickness of the soft plastic layer, wherein the thickness of the soft plastic layer is consistent with the size of the selected block stone; 302, pouring from one side of the soft plastic clay layer, and manually matching and moving the loose stones to the soft plastic clay layer; step 303, shoveling and transporting the slurry extruded from the other side of the rock block to other places; step 304, continuously dumping the rock blocks and moving the rock blocks until the rock blocks are filled on the hard soil base layer at the bottom of the slurry; the rock blocks are repeatedly and gradually pushed to the far side and the two sides of the mud pond until the mud pond is completely filled and leveled; 305, arranging a matching cushion layer on the rock block; and step 306, measuring the surface elevation of the surface of the mud pond after the mud pond is filled.
By adopting the technical scheme, the method has the advantages that: when the landscape foundation is arranged in a deep backfill region of early engineering activities, the backfill materials on the two sides of the landscape foundation can improve the bearing capacity of the bearing layer and reduce the settlement of the foundation, and the water permeability of the backfill materials is good, so that the discharge of water in soft soil is accelerated; thereby accelerating the consolidation of soft soil and effectively playing the role of frost heaving; the replacement and filling amount of the two sides of the landscape foundation is small, the construction period is short, and the cost is low; the problems that when the foundation of the landscape structure is placed in a deep backfill region of early engineering activities, the tamping construction period of the deep backfill region is long and the project cost is high are solved;
when the landscape foundation is positioned in the ponding area, the shallow soft plastic clay layer and the deep soft plastic clay layer are respectively treated, and the bearing capacity of the landscape foundation in the ponding area can be improved by matching with the cushion layer and the rock blocks; the problem that the landscape foundation is difficult to build in the ponding area is solved.
Further, in step 101, determining a total replacement and filling thickness h1 according to the width b of the landscape foundation; h1 is more than 0.7 b; determining the width of the top surface B of the isosceles trapezoid groove according to the total thickness h1, the diffusion angle Q of the filling material and the loose filling thickness C; b +2 × h1 × tan (q) +2 × C.
By adopting the technical scheme, the method has the advantages that: the backfill layer determines the reasonable thickness and width of the cross section, has enough thickness to replace the soft soil layer which is possibly sheared and damaged, and has enough width to prevent the backfill layer from being squeezed towards two sides.
Further, in step 102, the replacing and filling materials on the two sides of the landscape foundation are sand-gravel coarse sand mixture, and the loose filling thickness C of each layer is 200mm when the layers are replaced and filled; in step 103, during the layered filling process of the filling layer, the grains of each layer of sand-gravel coarse sand mixture incline downwards during tamping.
By adopting the technical scheme, the method has the advantages that: the sand-gravel coarse sand mixture has good drainage performance, and meets the requirement of forming a sufficient drainage layer by a replacement and filling layer.
Further, in step 104, the surface cushion layer is plain soil, and the plain soil is tamped; in step 305, the mating cushion is grit, which is tamped.
By adopting the technical scheme, the method has the advantages that: the soil is tamped, so that the upper surface of the landscape foundation is relatively flat and attractive, and the drainage requirement of the foundation is met; during the course of tamping coarse sand, the coarse sand can be fully combined with the block stone to form a stable foundation.
Further, in step 105, after the static sounding detection is completed, an effective static touch test result report is submitted, and according to result report data, the original basic design and the foundation parameter value changing and filling are rechecked.
By adopting the technical scheme, the method has the advantages that: and (4) rechecking the original foundation design and the parameter value of the replacement foundation in time according to the result report, and adjusting the subsequent foundation treatment construction scheme in time.
Further, in step 306, the surface elevation is lower than the design elevation, and the elevation of the structural substrate meets the design requirement by using a thickening cushion method; and (5) adjusting the vertical design of the landscape foundation when the height is higher than the designed elevation.
By adopting the technical scheme, the method has the advantages that: and the surface elevation is measured in time, and a designer can adjust the corresponding landscape basic design according to the site surface elevation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 shows a schematic structural diagram of a landscape foundation when placed in a deep backfill region for early stage engineering activities;
FIG. 2 shows a cross-sectional view of the plane A-A of FIG. 1;
FIG. 3 shows a top view of FIG. 1;
fig. 4 shows a structural schematic diagram of the foundation when the landscape foundation is in a deep soft clay layer.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The following is further detailed by the specific embodiments:
reference numerals in the drawings of the specification include: the building landscape stone comprises a replacement and filling layer 1, a surface cushion layer 2, an isosceles trapezoid groove 3, a landscape foundation 4, a block stone 5 and a matching cushion layer 6.
An embodiment of a method for treating soft foundation is shown in figures 1-4,
the specific implementation process of the invention comprises the following steps:
as shown in fig. 1 and 4: comprises the following steps;
when the landscape foundation 4 is arranged in a deep backfill and replacement area of early engineering activities, in step 101, an isosceles trapezoid groove 3 is dug in the landscape foundation, the landscape foundation 4 is arranged in the center of the isosceles trapezoid groove 3, and the included angle of the top surface of the isosceles trapezoid groove 3 is 30 degrees; 102, replacing and filling the two sides of the landscape foundation 4 in layers, wherein the replacing and filling materials are coarse sand, a sand-gravel coarse sand mixture with proper gradation and plain soil; 103, tamping the filling layer 1 by using a mechanical tamping machine, tamping, semi-tamping, and tamping for 5-6 times back and forth when the tamping machine moves, and loosely filling the next layer when the indentation of the previous time and the indentation of the next time are within 1mm by observing by eyes; repeating the process for the next layer until the filling design elevation is changed; 104, arranging a surface cushion layer 2 above the backfill layer 1, wherein the thickness of the surface cushion layer 2 is 300 mm; 105, when the materials to be changed and the tamping operation passes are consistent, only in the first changing and filling position, a project construction unit or a constructor automatically entrusts qualified static sounding units to perform static sounding detection, and after the static sounding detection is completed, an effective static touch test result report is submitted, and a designer rechecks the original basic design and the value of the changing and filling foundation parameter and makes necessary correction on the design according to the result report;
when the landscape foundation 4 is positioned in the water accumulation area: for a shallow soft plastic soil layer, step 201, shoveling the soft plastic layer soil and exposing a lower layer of unstirred hard soil layer; step 202, arranging a thickened cushion layer on a hard soil layer;
when water is accumulated on a deeper soft plastic soil layer or the surface, step 301, selecting the size of the block stone 5 according to the thickness of the soft plastic layer, wherein the thickness of the soft plastic layer is consistent with the size of the selected block stone 5; 302, pouring from one side of the soft plastic clay layer, and manually moving the loose rock 5 to the soft plastic clay layer in a matching manner; 303, shoveling and transporting the slurry extruded from the other side of the rock block 5 to other places; step 304, continuously dumping the rock blocks 5 and moving the rock blocks 5 until the rock blocks are filled on the hard soil base layer at the bottom of the slurry; the rock blocks 5 are repeatedly and gradually pushed to the far side and the two sides of the mud pond until the mud pond is completely filled and leveled; 305, arranging a matching cushion layer 6 on the block stone 5; step 306, measuring the surface elevation of the surface of the mud pond after the mud pond is filled, wherein the surface elevation is lower than the designed elevation, and enabling the elevation of the structural substrate to meet the design requirement by using a thickening cushion layer method; higher than the design elevation, and the landscape foundation 4 is adjusted to be vertically designed.
By adopting the technical scheme, the method has the advantages that: when the landscape foundation 4 is arranged in a deep backfill region of early engineering activities, the backfill materials on the two sides of the landscape foundation 4 can improve the bearing capacity of the bearing layer and reduce the settlement of the foundation, and because the water permeability of the backfill materials is good, the water discharge in soft soil is accelerated; thereby accelerating the consolidation of soft soil and effectively playing the role of frost heaving; the replacement and filling amount of the two sides of the landscape foundation 4 is small, the construction period is short, and the cost is low; the problems that when the foundation of the landscape structure is placed in a deep backfill region of early engineering activities, the tamping construction period of the deep backfill region is long and the project cost is high are solved; and (4) rechecking the original foundation design and the parameter value of the replacement foundation in time according to the result report, and adjusting the subsequent foundation treatment construction scheme in time.
When the landscape foundation 4 is positioned in the ponding area, the shallow soft plastic clay layer and the deep soft plastic clay layer are respectively treated, and the bearing capacity of the landscape foundation 4 foundation in the ponding area can be improved by matching with the cushion layer 6 and the block stones 5; the problem that the landscape foundation 4 is difficult to build in the ponding area is solved; and the surface elevation is measured in time, and a designer can adjust the design of the corresponding landscape foundation 4 according to the site surface elevation.
As shown in fig. 1: in step 101, determining a total replacement and filling thickness h1 according to the width of the landscape foundation 4, wherein the total replacement and filling thickness h1 is more than 0.7, b is 0.7 × 1500, 1050mm, and h1 is 1100 mm; determining the width B of the top surface of the isosceles trapezoid groove 3 according to the total thickness h1, the diffusion angle Q of the filling material and the loose filling thickness C; 1100 × tan (30) ═ 635mm, and B ═ 1500+2 × 635+2 × 200 ═ 3100 mm.
By adopting the technical scheme, the method has the advantages that: the backfill layer 1 defines a reasonable thickness and width of the cross section, and has sufficient thickness to displace soft soil layers which may be damaged by shearing, and sufficient width to prevent the backfill layer 1 from being squeezed towards both sides.
In step 102, the two sides of the landscape foundation 4 are filled with sand, pebble and coarse sand, and the loose filling thickness of each layer is 200mm when the layers are filled in a layered manner; in the step 103, in the layered filling process of the filling layer 1, the grains of each layer of sand-gravel coarse sand mixture incline downwards in the tamping process.
By adopting the technical scheme, the method has the advantages that: the sand-gravel coarse sand mixture has good drainage performance, and meets the requirement that the replacement and filling layer 1 forms an enough drainage layer.
As shown in fig. 1 and 4: in step 104, the surface cushion layer 2 is plain soil, and the plain soil is tamped; in step 305, the mating mat 6 is grit, which is tamped.
By adopting the technical scheme, the method has the advantages that: the soil is tamped, the upper surface of the landscape foundation 4 is smooth and beautiful, and the drainage requirement of the foundation is met; during the course of tamping coarse sand, the coarse sand can be fully combined with the block stone 5 to form a stable foundation.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (6)
1. A soft foundation treatment method is characterized in that: comprises the following steps;
when the landscape foundation is arranged in a deep backfill and replacement area of an early engineering activity, step 101, an isosceles trapezoid groove is dug in the landscape foundation, and the landscape foundation is arranged in the center of the isosceles trapezoid groove; 102, replacing and filling the two sides of the landscape foundation layer by layer, wherein the replacing and filling materials are coarse sand, a proper-gradation sand-pebble coarse sand mixture and plain soil; 103, tamping and replacing the filling layer by using a mechanical tamping machine, tamping, semi-tamping, and tamping for 5-6 times back and forth when the tamping machine moves, and loosely filling the next layer when the indentation of the previous time and the indentation of the next time are within 1mm by observing by eyes; repeating the process for the next layer until the filling design elevation is changed; 104, arranging a surface cushion layer above the backfill layer; 105, when the tamping operation passes are consistent as the same as the filling material, only in the first filling position, a qualified static sounding unit is entrusted by a project construction unit or a construction party to perform static sounding detection;
when the landscape foundation is located in the water accumulation area, aiming at a shallow soft plastic-shaped soil layer, step 201, shoveling the soft plastic layer soil and exposing a lower layer of unstirred hard soil layer; step 202, arranging a thickened cushion layer on a hard soil layer;
when water is accumulated on a deeper soft plastic soil layer or the surface, step 301, selecting the size of the block stone according to the thickness of the soft plastic layer, wherein the thickness of the soft plastic layer is consistent with the size of the selected block stone; 302, pouring from one side of the soft plastic clay layer, and manually matching and moving the loose stones to the soft plastic clay layer; step 303, shoveling and transporting the slurry extruded from the other side of the rock block to other places; step 304, continuously dumping the rock blocks and moving the rock blocks until the rock blocks are filled on the hard soil base layer at the bottom of the slurry; the rock blocks are repeatedly and gradually pushed to the far side and the two sides of the mud pond until the mud pond is completely filled and leveled; 305, arranging a matching cushion layer on the rock block; and step 306, measuring the surface elevation of the surface of the mud pond after the mud pond is filled.
2. The weak foundation treatment method according to claim 1, wherein: in step 101, determining a total replacement and filling thickness h1 according to the width b of the landscape foundation; h1 is more than 0.7 b; determining the width of the top surface B of the isosceles trapezoid groove according to the total thickness h1, the diffusion angle Q of the filling material and the loose filling thickness C; b +2 × h1 × tan (q) +2 × C.
3. The weak foundation treatment method according to claim 1, wherein: in step 102, replacing and filling materials on two sides of the landscape foundation by sand, pebble and coarse sand mixtures, wherein the loose filling thickness C of each layer is 200mm when the landscape foundation is replaced and filled in layers; in step 103, during the layered filling process of the filling layer, the grains of each layer of sand-gravel coarse sand mixture incline downwards during tamping.
4. The weak foundation treatment method according to claim 1, wherein: in the step 104, the surface cushion layer is plain soil, and the plain soil is tamped; in step 305, the mating cushion is grit, which is tamped.
5. The weak foundation treatment method according to claim 1, wherein: in step 105, after the static sounding detection is completed, an effective static touch test result report is submitted, and the original foundation design and the foundation change parameter value are rechecked according to the result report data.
6. The weak foundation treatment method according to claim 1, wherein: step 306, enabling the elevation of the structural substrate to meet the design requirement by using a thickening cushion layer method when the elevation of the surface is lower than the design elevation; and (5) adjusting the vertical design of the landscape foundation when the height is higher than the designed elevation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802766.1A CN113356176A (en) | 2021-07-15 | 2021-07-15 | Soft foundation treatment method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110802766.1A CN113356176A (en) | 2021-07-15 | 2021-07-15 | Soft foundation treatment method |
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| CN113356176A true CN113356176A (en) | 2021-09-07 |
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| CN202110802766.1A Pending CN113356176A (en) | 2021-07-15 | 2021-07-15 | Soft foundation treatment method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437337A (en) * | 2013-08-21 | 2013-12-11 | 国家电网公司 | Method for reinforcing soft soil foundation in cushion layer replacement mode |
| CN111472359A (en) * | 2020-03-19 | 2020-07-31 | 中国二十冶集团有限公司 | Method for replacing and filling peat soil soft foundation box culvert foundation |
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2021
- 2021-07-15 CN CN202110802766.1A patent/CN113356176A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437337A (en) * | 2013-08-21 | 2013-12-11 | 国家电网公司 | Method for reinforcing soft soil foundation in cushion layer replacement mode |
| CN111472359A (en) * | 2020-03-19 | 2020-07-31 | 中国二十冶集团有限公司 | Method for replacing and filling peat soil soft foundation box culvert foundation |
Non-Patent Citations (1)
| Title |
|---|
| 王雅丽, 重庆大学出版社 * |
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