CN111021171A - Method for widening soft soil roadbed in frozen soil area - Google Patents
Method for widening soft soil roadbed in frozen soil area Download PDFInfo
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- CN111021171A CN111021171A CN201911307715.0A CN201911307715A CN111021171A CN 111021171 A CN111021171 A CN 111021171A CN 201911307715 A CN201911307715 A CN 201911307715A CN 111021171 A CN111021171 A CN 111021171A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- Structural Engineering (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a method for widening a soft soil roadbed in a frozen soil area, which comprises the following steps of S1, carrying out back excavation treatment on the edge of an old roadbed to form a trapezoidal connecting end surface; s2, marking pile sinking points in the roadbed area to be widened at the edge of the old roadbed, and deeply penetrating a sinking pipe into a soft soil foundation by using hammering equipment; putting stone into the structural hole of the immersed tube, vibrating and tamping to finish pile sinking operation; the roadbed area to be widened comprises a connection area and a common area; s3, paving a mattress layer on the roadbed to be widened after pile sinking operation is completed; and S4, arranging a geogrid on the mattress layer. The invention solves the technical problems that the conventional compaction treatment method has higher disturbance to the foundation due to higher geological liquidity degree of the weak roadbed, influences the stability of the lapped structure of the new roadbed and the old roadbed, is difficult to construct in a frozen soil period and has to be stopped for waiting for proper time to construct.
Description
Technical Field
The invention relates to the field of soft soil foundation reinforcement treatment construction, in particular to a method for widening a soft soil roadbed in a frozen soil area.
Background
Soft soil foundations are foundations composed of weak soil (such as silt, mucky soil, filled soil, miscellaneous fill or other highly compressible soil) having low strength, high compressibility and other undesirable properties. In order to meet the requirements of engineering construction, appropriate reinforcement measures are required to improve foundation conditions, improve foundation bearing capacity and ensure engineering quality.
With the development of the times and the increase of traffic flow, the existing road is difficult to meet the traffic demand, the road needs to be expanded and corrected, and the soft soil foundation has poor stability, so that the lap joint of the old and new roadbeds for road expansion on the soft soil foundation brings challenges. By adopting a conventional soft soil compaction method, the soft soil is easily stressed and twisted in the processing process, so that the construction of a widened roadbed is influenced, an old roadbed is also influenced, the construction is difficult in the frozen soil period due to high geological liquid degree in the soft roadbed, and particularly, the engineering in the frozen soil area has to wait for proper time for construction in the frozen soil period.
Disclosure of Invention
The invention mainly aims to provide a method for widening a soft soil roadbed in a frozen soil area, and aims to solve the technical problems that the liquid degree of the geology of the soft roadbed is high, the conventional compaction treatment method has high disturbance on the foundation, influences the stability of a lapped structure of a new roadbed and an old roadbed, is difficult to construct in a frozen soil period and has to be stopped and wait for proper time to construct.
In order to achieve the above object, according to one aspect of the present application, there is provided a method for widening a soft soil roadbed in a frozen soil area.
The method for widening the soft soil roadbed in the frozen soil area comprises the following steps:
s1, performing back excavation treatment on the edge of an old roadbed to form a trapezoidal connecting end face;
s2, marking pile sinking points in the roadbed area to be widened at the edge of the old roadbed, and deeply penetrating a sinking pipe into a soft soil foundation by using hammering equipment; putting stone into the structural hole of the immersed tube, vibrating and tamping to finish pile sinking operation; the roadbed area to be widened comprises a connection area and a common area;
s3, paving a mattress layer on the roadbed to be widened after pile sinking operation is completed;
and S4, arranging a geogrid on the mattress layer.
Further, the number of the driven piles in the connecting area is not less than that in the common area.
Furthermore, between the pile sinking points of the connection area and the common area, any 3 adjacent connecting lines at the positions where the pile sinking points which are not located on the same straight line are located are in an equilateral triangle shape.
Furthermore, the pile sinking points are uniformly distributed in the connection area and/or the common area.
Further, the mattress layer is a gravel layer.
Further, the distance of the depth of the immersed tube entering the medium sand layer is not less than 1 meter.
In the embodiment of the invention, the purpose of reducing the influence on the soft foundation in the construction process is achieved by changing the soft foundation reinforcing method and arranging the pile sinking, so that the new and old technical effects are realized, and the technical problems that the conventional compaction treatment method has large disturbance on the foundation, influences the stability of the lapped structure of the new and old roadbeds, is difficult to construct when the frozen soil period is involved and has to be stopped and wait for proper time to construct because the geological liquidity of the soft foundation is higher are solved.
In addition, the soft soil foundation method is particularly suitable for areas with high underground water level, and utilizes the drainage function of pile bodies of pile sinking (gravel piles) to form a drainage channel to drain water in the peripheral weak soil into the underground water layer at the lower part, so that the consolidation of the peripheral weak soil is accelerated, and the bearing capacity of the peripheral soil is improved.
Meanwhile, the soft soil foundation method is suitable for soft soil treatment of reconstruction and extension projects, the consolidation condition of the soil body of the foundation is better because old roads are settled for many years, and the newly-built part of foundation can accelerate the consolidation of foundation soil and improve the bearing capacity of the newly-built part of foundation, so that the uneven settlement caused by splicing new and old roadbeds is reduced, and the construction time is saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the invention and to make further features, objects, and advantages of the invention apparent. The drawings and their description illustrate exemplary embodiments of the invention and do not limit it inappropriately. In the drawings:
fig. 1 is a schematic structural view of a construction layout of a method for widening a soft soil roadbed in a frozen soil area according to an embodiment of the present invention.
Fig. 2 is a distribution diagram of pile sinking points of the method for widening the soft soil roadbed in the frozen soil area according to the embodiment of the invention.
Detailed Description
In order to make the person skilled in the art better understand the application scheme of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any inventive step based on the embodiments in the present application, shall fall within the scope of protection of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the present application are described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present application can be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "sleeved" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the drawings.
Soft soil foundations are foundations composed of weak soil (such as silt, mucky soil, filled soil, miscellaneous fill or other highly compressible soil) having low strength, high compressibility and other undesirable properties. In order to meet the requirements of engineering construction, appropriate reinforcement measures are required to improve foundation conditions, improve foundation bearing capacity and ensure engineering quality.
The geological liquidity of soft soil foundations is usually reduced by drainage and the arrangement of geogrids. In the process of widening the new roadbed and the old roadbed on the soft foundation, due to the geological liquid property of the soft foundation, when the foundation beside the old roadbed is constructed, the conventional treatment method of the soft foundation is adopted to reduce the geological liquid degree, such as pumping or compacting, the excavation of a foundation pit is deeper in construction, the disturbance of the foundation pit is large, the damage of the old roadbed is easily caused, and the construction and the connection of the new roadbed are not facilitated.
Because excavation of foundation pits is involved in a traditional soft soil foundation treatment method and is mostly carried out by adopting mechanical and manual cooperation, the liquid property of soft geology determines that the project is seriously influenced by local climate under the low-temperature environment of a frozen soil area.
In order to reduce the influence of the low-temperature environment of the frozen soil area on the widening treatment of the soft soil foundation, a treatment scheme is provided, and the treatment scheme aims at reducing the influence of climate on the engineering, shortening the construction period and simultaneously improving the safety factor of the construction environment.
The invention relates to a method for widening a soft soil roadbed in a frozen soil area, which comprises the following steps
S1, performing back excavation treatment on the edge of an old roadbed to form a trapezoidal connecting end face;
s2, marking pile sinking points in the roadbed area to be widened at the edge of the old roadbed, and deeply penetrating a sinking pipe into a soft soil foundation by using hammering equipment; putting stone into the structural hole of the immersed tube, vibrating and tamping to finish pile sinking operation; the roadbed area to be widened comprises a connection area and a common area;
s3, paving a mattress layer on the roadbed to be widened after pile sinking operation is completed; preferably, the mat is a gravel mat.
And S4, arranging a geogrid on the mattress layer.
In a preferred embodiment of the present invention, the number of the sinking piles in the connection area is not less than that in the general area, so that the structure of the connection area (the bridge head transition section) is more stable than that in the general area (the general section), which is convenient for the connection of the new and old roadbed, and the cracking of the road caused by the excessive settlement is avoided.
In a preferred embodiment of the present invention, as shown in fig. 1 and fig. 2, the number of driven piles in the connection area is not less than that in the common area, and between the driven piles in the connection area and the common area, a connection line between the positions of any 3 adjacent driven piles which are not located on the same straight line is an equilateral triangle. The structure of the equilateral triangle is set, so that the structure between the pile sinking is more regular, the force transmission is more convenient, and the stability of the overall structure of the roadbed is favorably improved. The distance of the depth of the immersed tube entering the medium sand layer is not less than 1 meter.
In addition, the soft soil foundation method is particularly suitable for areas with high underground water level, and utilizes the drainage function of pile bodies of pile sinking (gravel piles) to form a drainage channel to drain water in the peripheral weak soil into the underground water layer at the lower part, so that the consolidation of the peripheral weak soil is accelerated, and the bearing capacity of the peripheral soil is improved.
Meanwhile, the soft soil foundation method is suitable for soft soil treatment of reconstruction and extension projects, the consolidation condition of the soil body of the foundation is better because old roads are settled for many years, and the newly-built part of foundation can accelerate the consolidation of foundation soil and improve the bearing capacity of the newly-built part of foundation, so that the uneven settlement caused by splicing new and old roadbeds is reduced, and the construction time is saved.
In a preferred embodiment of the invention, the driven piles are gravel piles, the planes of the gravel piles are arranged in an equilateral triangle, the treatment range is 1m outside the toe, and the diameter of each gravel pile is 0.5 m; the gravel pile is made of undegraded clean gravel or rolled gravel, the particle size is 20-50mm, the gravel pile has a certain gradation, and the mud content is less than or equal to 5%. The bottom of each gravel pile is required to enter a middle sand layer and is not smaller than 1m, the gravel piles are arranged according to the interval of 1.5m, and the interval of the bridge head transition section which is an encryption section is 1.2 m. The gravel pile top sets up the gravel bed course of one deck 50cm, one deck geogrid is laid to the mattress bed course top surface that the gravel bed course formed.
Specifically, the broken stone granule pile soft foundation reinforcing technology is characterized in that loose sand is compacted through the actions of extrusion, vibration and the like, so that the bearing capacity of a foundation is increased, the porosity ratio is reduced, the building settlement is reduced, and the vibration liquefaction resistance of the sand foundation is improved; the method is used for treating the soft clay foundation, can play roles of displacement and drainage, accelerates the consolidation of soil, forms a composite foundation of a displacement pile and the consolidated soft clay, and remarkably improves the shear strength of the foundation.
Firstly, the method for widening the soft soil foundation in the frozen soil area adopts a hammering pipe sinking construction technology, and has the advantages that:
1. the construction method can effectively adapt to various climatic conditions, and has the advantages of long construction time and simple construction method.
2. The gravel pile formed by hammering is used for processing, so that great disturbance to a foundation in the construction process can be avoided, corresponding safety protection measures can be avoided, and the safety cost investment is reduced.
3. The pile sinking method has good effect of treating soft foundation, especially sandy soil, mucky soil, silt soil and the like. For the soil, the compaction effect is better, the drainage consolidation of the soft soil foundation is accelerated, the liquefaction effect can be eliminated, the side friction resistance is increased, and the comprehensive bearing capacity of the composite foundation is improved.
Secondly, the method has strong environmental adaptability and long construction time. Meanwhile, the construction method is simple, and the treatment effect on the reconstruction and extension soft foundation is obvious:
the invention discloses a method for widening a soft soil foundation in a frozen soil area, which is characterized in that a hammering device is utilized to drive a sinking pipe into the soft soil foundation, then stones are put into holes, and a pile body is vibrated and compacted through the circulation of vibration compaction and reverse insertion vibration;
the method for widening the soft soil foundation in the frozen soil area is particularly suitable for sandy soil and mucky soil with high underground water level, can effectively eliminate liquefaction of the sandy soil, and is also suitable for treating the soft soil foundation with the depth of more than 4 m;
the method for widening the soft soil foundation in the frozen soil area is safe and reliable in construction process and low in safety protection cost. Other soft foundation replacement and filling treatment methods have the disadvantages of large foundation pit disturbance, high safety risk and high protection cost due to the fact that the foundation pit is deeply excavated.
In the embodiment of the invention, the purpose of reducing the influence on the soft foundation in the construction process is achieved by changing the soft foundation reinforcing method and arranging the pile sinking, so that the new and old technical effects are realized, and the technical problems that the conventional compaction treatment method has large disturbance on the foundation, influences the stability of the lapped structure of the new and old roadbeds, is difficult to construct when the frozen soil period is involved and has to be stopped and wait for proper time to construct because the geological liquidity of the soft foundation is higher are solved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. The method for widening the soft soil roadbed in the frozen soil area is characterized by comprising the following steps:
s1, performing back excavation treatment on the edge of an old roadbed to form a trapezoidal connecting end face;
s2, marking pile sinking points in the roadbed area to be widened at the edge of the old roadbed, and deeply penetrating a sinking pipe into a soft soil foundation by using hammering equipment; putting stone into the structural hole of the immersed tube, vibrating and tamping to finish pile sinking operation; the roadbed area to be widened comprises a connection area and a common area;
s3, paving a mattress layer on the roadbed to be widened after pile sinking operation is completed;
and S4, arranging a geogrid on the mattress layer.
2. A method for widening a soft soil foundation in a frozen soil area as claimed in claim 1, wherein the number of piles sunk in said joining area is not less than that in said ordinary area.
3. A soft soil foundation widening method for frozen soil areas as claimed in claim 2, wherein any 3 connecting lines between pile sinking points of the joining area and the common area, at which pile sinking points which are adjacent and not located on the same straight line are located, are in the shape of an equilateral triangle.
4. The widening method of the soft soil foundation in the frozen soil area according to claim 3, wherein the pile sinking points are uniformly distributed in the joining area and/or the common area.
5. The widening method for the soft soil subgrade in the frozen soil area according to claim 1, wherein the mattress layer is a gravel layer.
6. The widening method for the soft soil roadbed in the frozen soil area as claimed in claim 1, wherein the distance of the depth of the immersed tube entering the medium sand layer is not less than 1 m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911307715.0A CN111021171A (en) | 2019-12-17 | 2019-12-17 | Method for widening soft soil roadbed in frozen soil area |
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| CN201911307715.0A CN111021171A (en) | 2019-12-17 | 2019-12-17 | Method for widening soft soil roadbed in frozen soil area |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195703A (en) * | 2020-09-16 | 2021-01-08 | 天津大学 | Calculation method for stability control of gravel pile and geogrid combined foundation |
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| CN106245692A (en) * | 2016-08-30 | 2016-12-21 | 中国建筑西南勘察设计研究院有限公司 | Reinforcement pile construction method is sunk in soft soil foundation control |
| CN106836205A (en) * | 2017-03-20 | 2017-06-13 | 大成科创基础建设股份有限公司 | Suitable for the Macadam Pile Construction method of saturated soft soil |
| CN106988178A (en) * | 2017-04-14 | 2017-07-28 | 华中科技大学 | A kind of subgrade in soft soil zone widened structure and its construction method |
| CN107815937A (en) * | 2017-10-30 | 2018-03-20 | 山东大学 | Branch's dam filling construction of Expressway Widening roadbed |
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2019
- 2019-12-17 CN CN201911307715.0A patent/CN111021171A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104278608A (en) * | 2013-07-05 | 2015-01-14 | 杭州华水市政工程有限公司 | Novel highway embankment widened structure and construction method |
| CN106245692A (en) * | 2016-08-30 | 2016-12-21 | 中国建筑西南勘察设计研究院有限公司 | Reinforcement pile construction method is sunk in soft soil foundation control |
| CN106836205A (en) * | 2017-03-20 | 2017-06-13 | 大成科创基础建设股份有限公司 | Suitable for the Macadam Pile Construction method of saturated soft soil |
| CN106988178A (en) * | 2017-04-14 | 2017-07-28 | 华中科技大学 | A kind of subgrade in soft soil zone widened structure and its construction method |
| CN107815937A (en) * | 2017-10-30 | 2018-03-20 | 山东大学 | Branch's dam filling construction of Expressway Widening roadbed |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195703A (en) * | 2020-09-16 | 2021-01-08 | 天津大学 | Calculation method for stability control of gravel pile and geogrid combined foundation |
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Application publication date: 20200417 |