CN215210267U - Gobi gravel soil roadbed structure in desert shallow water lake area - Google Patents
Gobi gravel soil roadbed structure in desert shallow water lake area Download PDFInfo
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- CN215210267U CN215210267U CN202120924175.7U CN202120924175U CN215210267U CN 215210267 U CN215210267 U CN 215210267U CN 202120924175 U CN202120924175 U CN 202120924175U CN 215210267 U CN215210267 U CN 215210267U
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Abstract
A desert shallow water lake area Gobi gravel soil roadbed structure comprises an underwater part roadbed structure and an above-water part roadbed structure, wherein the underwater part roadbed structure comprises a lake bottom soft stratum, an underwater part Gobi gravel soil disposal layer backfilled on the lake bottom soft bottom layer, a plurality of dynamic compaction replacement piers arranged on the underwater part Gobi gravel soil disposal layer and the lake bottom soft stratum, and a gabion slope paved on the slope surface of the underwater part Gobi gravel soil disposal layer; the overwater part roadbed mechanism comprises a partition layer laid on the surface of the underwater part Gobi gravel soil treatment layer, overwater part Gobi gravel soil which is backfilled and rolled on the partition layer in a layered mode, first anti-filtration geotextile laid on the top surface of the overwater part Gobi gravel soil, and an overwater part roadbed slope protection and a slope protection way laid on the overwater part Gobi gravel soil slope surface. The utility model discloses both satisfied Gobi gravel dirt road bed and filled the technical requirement that quality, road bed are stable in the lake area, make full use of again local Gobi gravel soil resource, reduced engineering cost.
Description
Technical Field
The utility model belongs to the technical field of the road construction, especially, relate to a desert shallow water lake district gobi gravel soil roadbed structure.
Background
A certain highway engineering in Xinjiang passes through a desert shallow water lake area, a powdery clay layer (a soft stratum) with the depth of 1-2 m exists at the bottom of the lake area, the water depth is about 3m, a roadbed needs to be filled underwater, and rich gobi gravel soil resources exist near the site of the engineering, so that how to utilize a large amount of gobi gravel soil resources locally according to local conditions is realized, the engineering cost is reduced, and the problem which needs to be solved urgently is solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a desert shallow water lake district gobi gravel soil roadbed structure had both satisfied gobi gravel soil roadbed and had filled the technical requirement that quality, road bed are stable in the lake district, make full use of again local gobi gravel soil resource, had reduced engineering cost.
The utility model discloses a realize through following technical scheme:
a desert shallow water lake area Gobi gravel soil roadbed structure comprises an underwater part roadbed structure and an above-water part roadbed structure, wherein the underwater part roadbed structure comprises a lake bottom weak stratum, an underwater part Gobi gravel soil disposal layer backfilled to a position above the water level on the lake bottom weak stratum, a plurality of dynamic compaction replacement piers are arranged on the underwater part Gobi gravel soil disposal layer and the lake bottom weak stratum, and a gabion slope is laid on protection is laid on the slope surface of the underwater part Gobi gravel soil disposal layer;
the overwater part roadbed mechanism comprises a partition layer, overwater part Gobi gravel soil layers, a first anti-filtration geotextile, overwater part roadbed revetments and a slope protection way, wherein the partition layer is laid on the surface of the underwater part Gobi gravel soil layer and used for preventing salt water in the lower part from entering the upper part roadbed, the overwater part Gobi gravel soil layers are backfilled on the partition layer in a layered mode and constructed in a rolling mode, the first anti-filtration geotextile is laid on the top surface of the overwater part Gobi gravel soil layers, and the overwater part roadbed revetments and the slope protection way are laid on the overwater part Gobi gravel soil slope surface.
Further, the length of the dynamic compaction replacement pier is not more than 10m, and the content of particles with the particle size of crushed stone of more than 300mm is not more than 30%.
Furthermore, a plurality of dynamic compaction replacement piers are arranged in a square or triangle in the gobi gravelly soil disposal layer and the weak stratum at the bottom of the lake at the underwater part.
Furthermore, the underground part gobi gravelly soil disposal layer is filled to be 1m above the water level, and the slope rate is 1: 2.
Furthermore, a layer of second reversed filter geotextile is laid between the slope surface of the partial Gobi gravel soil treatment layer and the gabion protection slope, and the unit area mass of the second reversed filter geotextile is 500g/m2。
Further, the partition layer is a 15 cm-thick lower gravel cushion layer, two cloth-one films and a 15 cm-thick upper gravel cushion layer which are sequentially laid from bottom to top, the two cloth-one films are made of polypropylene, polyester, cotton or polyethylene materials, and the waterproof plastic film is made of polyethylene or polyvinyl chloride materials.
Furthermore, the two cloths and the cloth with one film are made of polypropylene fiber materials, and the two cloths are combinedMeter 300g/m2The film is a water permeable plastic film made of polyvinyl chloride material, the thickness is 0.3mm, and the mass is 200g/m2。
Further, the first reverse filtering geotextile laid on the top surface of the gobi gravel soil on the water part adopts polypropylene woven cloth.
Furthermore, the roadbed slope protection of the part above the water adopts hexagonal precast blocks with the thickness of 8cm to protect the slope, the slope rate is 1:1.5, and the slope protection way adopts M10 grouted rubble stone slope protection.
Compared with the prior art, the beneficial effects of the utility model are that: when a lake bottom soft stratum exists in the bottom protection of a shallow water lake in the desert, a plurality of strong ramming replacement piers are arranged in the lake bottom soft stratum and the underground part Gobi gravelly soil disposal layer by adopting a strong ramming replacement method, so that the long-term residual settlement in the later period of the roadbed can be greatly reduced, and the construction quality of the engineering is ensured; the gobi gravelly soil with rich reserves is adopted, the filling cost is low, the transport distance is short, and the construction cost is greatly saved; under the slope protection measures of first anti-filtration geotextile, gabion protection, roadbed protection on the water part, slope protection way and the like, the Gobi gravel soil roadbed can keep the stability on the water and under the water; the utility model discloses both satisfied Gobi gravel dirt road bed and filled the technical requirement that quality, road bed are stable in the lake area, make full use of again local Gobi gravel soil resource, reduced engineering cost.
Drawings
Fig. 1 is a schematic structural diagram of the gobi gravel soil roadbed structure in the desert shallow water lake area.
In the figure, 1-a soft bottom layer at the bottom of a lake, 2-a treatment layer of partial Gobi gravel soil under water, 3-a dynamic compaction replacement pier, 4-a gabion revetment, 5-a partition layer, 6-partial Gobi gravel soil on water, 7-first reverse filter geotechnical cloth, 8-partial roadbed revetment on water, 9-a berm way, 10-second reverse filter geotechnical cloth and 11-a gabion foundation.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the utility model is used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to be referred must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a gory gravel soil roadbed structure in a desert shallow water lake area.
A desert shallow water lake area Gobi gravel soil roadbed structure comprises an underwater part roadbed structure and an above-water part roadbed structure, wherein the underwater part roadbed structure comprises a lake bottom weak stratum 1, an underwater part Gobi gravel soil disposal layer 2 backfilled above the water level on the lake bottom weak stratum 1, a plurality of dynamic compaction replacement piers 3 arranged on the underwater part Gobi gravel soil disposal layer 2 and the lake bottom weak stratum 1, and a gabion revetment 4 laid on the slope surface of the underwater part Gobi gravel soil disposal layer 2; the overwater part roadbed mechanism comprises a partition layer 5 which is laid on the surface of an underwater part Gobi gravel soil treatment layer 2 and used for preventing salt water in the lower part from entering an upper roadbed, overwater part Gobi gravel soil 6 which is backfilled on the partition layer 5 in a layered mode and constructed in a rolling mode, first anti-filtering geotextile 7 laid on the top surface of the overwater part Gobi gravel soil 6, and an overwater part roadbed slope protection 8 and a slope protection way 9 which are laid on the slope surface of the overwater part Gobi gravel soil 6.
The construction steps of the Gobi gravel soil roadbed structure in the desert shallow water lake region are as follows:
step 1: and (3) underwater part construction treatment:
step 1.1: and (2) backfilling Gobi gravel soil on a roadbed section to be filled in a soft stratum 1 at the bottom of the lake in the desert shallow water lake area to form an underwater part Gobi gravel soil disposal layer 2, backfilling the underground part Gobi gravel soil to a position 1m above the water level, wherein the slope rate is 1:2, and the width of the top surface of the underwater part Gobi gravel soil disposal layer 2 is determined according to the design requirement of the roadbed. And leveling the site by adopting a bulldozer, and impacting and rolling the backfilled surface layer to ensure that the compactness of the surface layer meets the use requirement of construction machinery.
Step 1.2: in order to determine the optimal dynamic compaction replacement construction parameters, a section of lake region with water depth of about 3m and lake bottom silty clay layer of 2.4m can be selected as a test region, a dynamic compaction replacement method is adopted to carry out foundation treatment and trial compaction on the lake bottom weak stratum 1 and the part of Gobi gravel soil under water, appropriate trial compaction parameters are selected according to design data and geological data, and the dynamic compaction replacement test region is monitored and detected. According to the test area result, the suitable dynamic compaction replacement construction parameters of the site are summarized as point compaction energy of 3000kN.m (determined according to the replacement depth), single-point compaction number of 11 strokes (determined according to the replacement depth), the distance between compaction points of 3.5m, point compaction times of 2 strokes, no interval between the tamping times, full compaction energy of 1000kN.m, full compaction times of 2 strokes, full compaction times of 1 stroke and full compaction point lap joint length of 1/4 times of hammer marks.
And (3) carrying out large-area dynamic compaction construction on the underground part of the Gobi gravel soil by adopting the suitable dynamic compaction or dynamic compaction replacement construction parameters, so that a plurality of dynamic compaction replacement piers 3 are arranged in the underground part of the Gobi gravel soil disposal layer 2 and the lake bottom weak stratum 1, and the plurality of dynamic compaction replacement piers 3 are arranged in a square or triangle in the underground part of the Gobi gravel soil disposal layer 2 and the lake bottom weak stratum 1.
And (3) detecting the processing effects of dynamic penetration test and static load test after tamping on the dynamic compaction or dynamic compaction replacement construction completion area and the dynamic compaction replacement pier 3, if the detection is qualified, performing the next procedure, if the detection is unqualified, repeating the previous step to continue dynamic compaction or dynamic compaction replacement until the detection is qualified.
Step 1.3: the protection slope of the underground part Gobi gravel soil disposal layer 2 is trimmed, the slope surface is subjected to gabion protection slope 4, the gabion foundation 11 is embedded in the soft bottom layer of the lake bottom, a layer of second reverse filtration geotextile 10 is laid on the slope surface in front of the gabion protection slope 4, and the protection slope filler is prevented from losing under the action of water flow. The gabion mesh material adopts special-shaped hot-dip galvanized low-carbon steel wires, resin protective films are coated on the gabion mesh material, the gabion filler adopts sheet stones, the second reverse filter geotextile 10 is 500g/m2 in unit area mass, and the first-grade geotextile is adopted.
Step 1.4: and (5) carrying out construction treatment and acceptance inspection on the underwater part.
Step 2: and (3) performing waterborne part construction treatment:
step 2.1: a gravel cushion layer with the thickness of 15cm is laid on the gravel soil surface of the partial Gobi under water, after two films are laid on the gravel cushion layer, the gravel cushion layer with the thickness of 15cm is continuously laid, the gravel cushion layer is made to be 30cm in thickness totally, and the two films are sandwiched in the middle of the gravel cushion layer to be used as a partition layer 5. The cloth of the two cloths and the film is made of polypropylene, terylene, cotton or polyethylene, preferably polypropylene, the mass of the two cloths is 300g/m2, the film is made of polyethylene or polyvinyl chloride, preferably polyvinyl chloride, the thickness of the film is 0.3mm, and the mass of the film is 200g/m 2.
Step 2.2: in order to determine the proper rolling construction parameters, a road section can be selected as a test area, and the gobi gravel soil 6 on the upper part of the water is backfilled layer by layer. Sprinkling water until the water content is close to the optimal water content, backfilling the Gobi gravel soil foundation on the water by adopting a layered rolling method, detecting the compaction degree of a rolling test area, and summarizing that the proper rolling construction parameters of the Gobi gravel soil are 4% -5% of the water content, about 35cm of paving thickness, 22t/12t of tonnage of the road roller and 5-6 times of rolling.
And (3) carrying out large-area rolling construction on the gobi gravelly soil 6 on the water part by adopting the suitable rolling construction parameters.
After the rolling construction of each layer is completed, carrying out compactness test treatment effect detection, and carrying out backfilling and rolling of the next layer until the backfilling and rolling is qualified;
step 2.3: and laying a layer of polypropylene woven first reverse filter geotextile 7 on the top surface of the gobi gravel soil 6 on the part above the water as a partition layer 5.
Step 2.4: constructing an overwater part roadbed protection slope 8 and a protection slope 9, wherein the overwater part roadbed protection slope 8 in the lake region adopts a solid prefabricated hexagonal prefabricated block with the thickness of 8cm, meanwhile, 4M wide back pressure protection slope 9 is arranged on two sides of the overwater part roadbed protection slope, the height of the protection slope 9 is 1.0M higher than the water surface, and M10 mortar stone protection feet are arranged on the inner side of the protection slope 9.
Compared with the prior art, the beneficial effects of the utility model are that: when a lake bottom soft stratum 1 exists in the bottom protection of a shallow water lake in the desert, a plurality of strong ramming replacement piers 3 are arranged in the lake bottom soft stratum 1 and the underwater part Gobi gravelly soil disposal layer 2 by adopting a strong ramming replacement method, so that the long-term residual settlement in the later period of the roadbed can be greatly reduced, and the construction quality of the engineering is ensured; the gobi gravelly soil with rich reserves is adopted, the filling cost is low, the transport distance is short, and the construction cost is greatly saved; under the protection measures of the slope, such as the first reverse filter geotextile 7, the gabion protection slope 4, the roadbed protection slope 8 on the water part and the protection slope way 9, the Gobi gravel roadbed can keep the stability on the water and under the water; the utility model discloses both satisfied Gobi gravel dirt road bed and filled the technical requirement that quality, road bed are stable in the lake area, make full use of again local Gobi gravel soil resource, reduced engineering cost.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any form, so that any simple modification, equivalent change and modification made by the technical entity of the present invention to the above embodiments without departing from the technical solution of the present invention all fall within the scope of the technical solution of the present invention.
Claims (9)
1. A Gobi gravel soil roadbed structure in a desert shallow water lake area is characterized by comprising an underwater part roadbed structure and an overwater part roadbed structure, wherein the underwater part roadbed structure comprises a lake bottom soft stratum, an underwater part Gobi gravel soil disposal layer backfilled to a position above the water level on the lake bottom soft stratum, a plurality of dynamic compaction replacement piers are arranged on the underwater part Gobi gravel soil disposal layer and the lake bottom soft stratum, and a gabion slope is laid on the slope surface of the underwater part Gobi gravel soil disposal layer;
the overwater part roadbed mechanism comprises a partition layer, overwater part Gobi gravel soil layers, a first anti-filtration geotechnical cloth, overwater part roadbed revetments and a slope protection way, wherein the partition layer is laid on the surface of the underwater part Gobi gravel soil treatment layer and used for preventing salt water in the lower part from entering the upper part roadbed, the overwater part Gobi gravel soil layers are backfilled on the partition layer in a layered mode and constructed in a rolling mode, the first anti-filtration geotechnical cloth is laid on the top surface of the overwater part Gobi gravel soil layers, and the overwater part roadbed revetments and the slope protection ways are laid on the overwater part Gobi gravel soil slope surface.
2. The Gobi gravelly soil subgrade structure in the shallow water lake area in the desert as claimed in claim 1, wherein the length of the dynamic compaction replacement piers is not more than 10m, and the content of particles with the particle size of crushed stones larger than 300mm is not more than 30%.
3. The Gobi gravel soil subgrade structure in the shallow desert lake area of the desert as claimed in claim 1, wherein a plurality of the dynamic compaction replacement piers are arranged in a square or triangle in the underwater part Gobi gravel soil disposal layer and the weak stratum at the bottom of the lake.
4. The Gobi gravel soil roadbed structure of the shallow water lake area in the desert as claimed in claim 1, wherein the underwater part of the Gobi gravel soil disposal layer is filled to a position 1m above the water level, and the slope rate is 1: 2.
5. The Gobi gravel soil roadbed structure of the shallow water lake area in the desert as claimed in claim 1, wherein a layer of second reversed filter geotextile is laid between the slope surface of the partial Gobi gravel soil treatment layer under the water and the gabion protection slope, and the unit area mass of the second reversed filter geotextile is 500g/m2。
6. The Gobi gravel soil roadbed structure of the shallow water lake area in the desert as claimed in claim 1, wherein the partition layer is a 15 cm-thick lower gravel cushion layer, two cloth-one membranes and a 15 cm-thick upper gravel cushion layer which are sequentially laid from bottom to top, the two cloth-one membranes are made of polypropylene, polyester, cotton or polyethylene, and the waterproof plastic film is made of polyethylene or polyvinyl chloride.
7. The Gobi gravelly soil roadbed structure of the shallow water lake area in the desert as claimed in claim 6, wherein the two cloths and the film cloth are made of polypropylene fiber materials, and the two cloths have a mass of 300g/m in total2The film is a water permeable plastic film made of polyvinyl chloride material, the thickness is 0.3mm, and the mass is 200g/m2。
8. The Gobi gravel soil subgrade structure in the shallow water lake area in the desert as claimed in claim 1, wherein the first inverse filter geotextile laid on the top surface of the Gobi gravel soil on the water part is a woven polypropylene fabric.
9. The gobi gravelly soil roadbed structure of the desert shallow water lake area as claimed in claim 1, wherein the roadbed slope protection at the water part adopts hexagonal precast blocks with the thickness of 8cm for slope protection, the slope rate is 1:1.5, and the slope protection way adopts M10 grouted rubble stone slope protection.
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| CN202120924175.7U CN215210267U (en) | 2021-04-29 | 2021-04-29 | Gobi gravel soil roadbed structure in desert shallow water lake area |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120924175.7U CN215210267U (en) | 2021-04-29 | 2021-04-29 | Gobi gravel soil roadbed structure in desert shallow water lake area |
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| CN215210267U true CN215210267U (en) | 2021-12-17 |
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