Ballasted weak-expansion soft soil railway subgrade bed frost boiling and mud pumping disease treatment facility

Abstract

The utility model discloses a ballast weak expansion soft soil railway subgrade bed frost boiling and mud pumping disease treatment facility, which belongs to the field of railway engineering and comprises a railway subgrade. The construction method comprises the following steps of: arranging lime soil compaction piles in a foundation bed of a railroad bed, arranging a railroad sleeper rail above the railroad bed, arranging a railroad steel rail above the railroad sleeper rail, arranging road shoulder walls on two sides of the railroad bed, and uniformly distributing railway ballasts between the railroad bed and the railroad sleeper rail. The construction method comprises the steps of orderly paying-off and pile position fixing, drilling and hole forming, lime-soil mixing, tamping, track finishing and the like, and lime-soil compaction piles are driven on a railway subgrade bed. According to the ballast weak-expansion soft soil railway subgrade bed frost boiling and mud pumping disease treatment facility adopting the structure, construction requirements are combined, construction is easy and convenient to implement, the treatment effect on frost boiling and mud pumping is remarkable, meanwhile, the bearing capacity and stability of a subgrade can be effectively enhanced, and a guarantee is provided for safe operation of a railway.

Description

Technical Field

[0001] The utility model relates to the technical field of railway engineering, in particular to a treatment facility for the disease of pumping mud from subgrade bed of ballastless and weakly expansive soft soil railway subgrade. Background Technique

[0002] With the continuous increase in the demand for long-distance transportation of bulk materials such as coal and ore, the speed increase of heavy-haul freight trains has become a key driving force for the transformation and upgrading of China's railway transportation system. In recent years, the annual transportation volume of China's heavy-haul railways has increased steadily, and the speed of heavy-haul trains has been successfully increased from 80 km / h to 90 km / h on many existing lines. However, in the widely distributed expansive soil areas, some railway lines with relatively low construction standards in the early stage are facing severe challenges, especially the sections using weakly expansive soil as embankment materials or without effective reinforcement of the foundation. These weakly expansive soil sections are highly sensitive to climate and hydrological conditions. After the speed increase of heavy-haul trains, under the combined action of internal and external factors (such as heavy load, speed increase, rainfall, and the swelling-shrinking property and fissure property of the soil itself), the subgrade condition deteriorates rapidly, and the phenomenon of pumping mud from subgrade bed occurs frequently, that is, the subgrade soil softens and liquefies under the combined action of train load and moisture, and the mud oozes to the road surface, resulting in subgrade instability and large changes in geometric dimensions, and then causing problems such as subgrade cracking, settlement, and landslide. The phenomenon of pumping mud from subgrade bed has seriously affected the stability of the line and the safety of train operation. In some individual sections, there are even phenomena of bridgehead uneven settlement, which pose a threat to the smoothness of train operation and the comfort of passengers.

[0003] Therefore, solving the problem of pumping mud from subgrade bed of weakly expansive soil subgrade in heavy-haul speed-up lines has become an important task that needs to be solved urgently in China's railway transportation system. The pumping mud from railway subgrade bed is a complex and serious geological disease, and its causes are diverse and intertwined. The soil property is the basic factor. The soil often contains easily softened components such as montmorillonite and chlorite. When encountering water, it expands and softens, significantly weakening the shear strength of the soil. Coupled with the fine soil texture, poor water permeability, and strong hydrophilicity, it is more likely to induce diseases. The intrusion of water is a necessary condition for pumping mud from subgrade bed. Surface water and groundwater increase the water content of subgrade soil through infiltration, reduce the bearing capacity of the soil, and promote the aggravation of subgrade deformation. Temperature fluctuation cannot be ignored either. The alternating cold and warm climate promotes the migration and phase change of moisture inside the subgrade, forming frost heaving and thaw settlement phenomena, further damaging the subgrade structure. In addition, the train traffic load plays an important role. The repeated action of the train load causes cumulative plastic deformation of the subgrade, and insufficient engineering quality, such as insufficient ballast thickness and ineffective drainage system, will reduce the stability and durability of the subgrade and exacerbate the development of pumping mud from subgrade bed. Therefore, preventing and controlling the pumping mud from railway subgrade bed requires comprehensive consideration of multi-dimensional factors such as soil quality, hydrology, climate, and human factors, and taking targeted measures for comprehensive treatment.

[0004] Existing various treatment methods for the disease of mud pumping and boiling have been successfully applied in multiple engineering practices, effectively solving the problem of mud pumping and boiling in railway subgrades and achieving remarkable results. However, it is worth noting that due to the different target requirements and construction conditions of different railway lines, the treatment methods and construction techniques need to be flexibly adjusted according to the specific engineering actual situation. Taking the Jiaozuo-Liuzhou line as an example, this line has heavy train loads, busy transportation tasks, and a long construction history. In addition, the space on both sides of the subgrade is narrow, making it difficult to provide ideal construction conditions. Therefore, when selecting the treatment plan and construction technique, the requirements for the Jiaozuo-Liuzhou line are particularly strict, and how to ensure the treatment effect has become a key issue that needs to be studied and solved urgently. Summary of the Invention

[0005] The purpose of the present utility model is to provide a treatment facility for the disease of mud pumping and boiling in the ballast bed of a railway subgrade with weakly expansive soft soil, so as to solve the problems mentioned in the background technology.

[0006] To achieve the above purpose, the present utility model provides a treatment facility for the disease of mud pumping and boiling in the ballast bed of a railway subgrade with weakly expansive soft soil, including a railway subgrade, and further including:

[0007] Lime-soil compaction piles, which are driven into the ballast bed of the railway subgrade to enhance the bearing capacity and stability of the railway subgrade;

[0008] Railway sleepers, which are arranged above the railway subgrade;

[0009] Railway rails, which are arranged above the railway sleepers;

[0010] Shoulder walls, which are arranged on both sides of the railway subgrade to provide support and protection;

[0011] Ballast, which is evenly distributed between the railway subgrade and the railway sleepers.

[0012] Preferably, the arrangement spacing of the railway sleepers is 0.6 m.

[0013] Preferably, the lime-soil compaction piles are arranged between the railway sleepers. The longitudinal spacing of the arrangement positions of the lime-soil compaction piles along the railway rails is 0.60 m, and they are respectively arranged 0.30 m on both sides of the railway rails transversely. The pile length of the lime-soil compaction piles is 3.5 m, and the pile body diameter D of the lime-soil compaction piles is 150 mm.

[0014] Therefore, the treatment facility for the disease of mud pumping and boiling in the ballast bed of a railway subgrade with weakly expansive soft soil adopting the above structure in the present utility model is simple and easy to construct, and has a remarkable treatment effect on mud pumping and boiling. At the same time, it can also effectively enhance the bearing capacity and stability of the subgrade, providing guarantee for the safe operation of the railway.

[0015] The technical solution of the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Description of the Drawings

[0016] Figure 1 It is a schematic plan layout diagram of an embodiment of a treatment facility for the disease of mud pumping and gushing in the subgrade bed of a ballast weak-expansion soft soil railway subgrade of the present utility model;

[0017] Figure 2 It is a schematic cross-sectional layout diagram of an embodiment of a treatment facility for the disease of mud pumping and gushing in the subgrade bed of a ballast weak-expansion soft soil railway subgrade of the present utility model;

[0018] Figure 3 It is a construction flow chart of an embodiment of a treatment facility for the disease of mud pumping and gushing in the subgrade bed of a ballast weak-expansion soft soil railway subgrade of the present utility model;

[0019] Reference Signs

[0020] 1, Lime-soil compaction pile; 2, Railway sleeper rail; 3, Railway steel rail; 4, Shoulder wall; 5, Ballast; 6, Toe wall; 7, Railway subgrade. Detailed Embodiment

[0021] The technical solution of the present utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical terms or scientific terms used in the present utility model shall have the ordinary meanings understood by those of ordinary skill in the field to which the present utility model belongs. The "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0023] Embodiment

[0024] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings.

[0025] As Figure 1-2 shown, the present utility model adopts a treatment facility for the disease of mud pumping and gushing in the subgrade bed of a ballast weak-expansion soft soil railway subgrade with the above structure, including a railway subgrade 7, and further including:

[0026] The lime-soil compaction pile 1 is driven into the subgrade bed of the railway subgrade 7 to enhance the bearing capacity and stability of the railway subgrade 7.

[0027] The railway sleepers 2 are arranged above the railway subgrade 7, and the layout spacing of the railway sleepers 2 is 0.6 m. The railway rails 3 are arranged above the railway sleepers 2; the railway sleepers 2 and the railway rails 3 are used to carry the train load.

[0028] The shoulder walls 4 are arranged on both sides of the railway subgrade 7 to provide additional support and protection.

[0029] The ballast 5 is evenly spread between the railway subgrade 7 and the railway sleepers 2. The ballast 5 is after manual screening and is spread at the predetermined track position to form a ballast bed with a certain thickness and width.

[0030] The lime-soil compaction piles 1 are arranged between the railway sleepers 2. The layout position of the lime-soil compaction piles 1 has a longitudinal spacing of 0.60 m along the railway rails 3, and is transversely arranged at 0.30 m on both sides of the railway rails 3. The pile length of the lime-soil compaction piles 1 is 3.5 m, and the pile body diameter D of the lime-soil compaction piles 1 is 150 mm.

[0031] The toe wall 6 is arranged at the toe of the side slope of the subgrade bed of the railway subgrade 7.

[0032] Such as Figure 3 , the construction steps are as follows:

[0033] Setting out and positioning the pile: According to the control axis, the center position of the pile is set out, and marks are made with wooden wedges or lime dots.

[0034] According to the control axis, the row pile control line is led to the subgrade bed of the railway subgrade, and then the center position of the pile is set out according to the construction drawings. The layout position of the lime-soil compaction piles 1 has a longitudinal spacing of 0.60 m along the railway, and is transversely arranged at 0.30 m on both sides of the rails, such as Figure 1 and Figure 2 shown. Marks are made with wooden wedges or lime dots (driving a steel bar into the soil for 20 - 30 cm, pulling it out and filling the hole with lime). The pile position deviation is controlled within 0.4D (pile body diameter D = 150 mm). The surveyor should promptly review and, after being accurate and error-free, the hole can be formed according to the set pile points. To ensure the accuracy of setting out, it should be arranged during the day as much as possible to avoid setting out errors at night and quality problems caused by untimely discovery.

[0035] Hole formation: The long auger drilling method is used for construction to form the pile holes of the lime-soil compaction piles 1.

[0036] Before drilling, the ballast within 0.3m below the bottom of the pillow needs to be manually screened, and then the hole is drilled vertically downward. The lime-soil compaction pile 1 is constructed by the long spiral drill drilling method. After the drilling rig is in place, the drill bit is now aligned with the center of the pile, and the verticality of the drill rod is corrected from two different directions with a plumb line. After it is determined to be within the allowable range of the specification (within 1.5% of the pile body length l=3.5m), the drill rod is driven into the soil with a D400 diesel hammer. When the water content is greater than 20%, shrinkage holes are prone to occur, and hole construction shall not be carried out. After the hole is formed, it should be tamped and filled in time, and the rolling of the drilling rig should be avoided as much as possible to avoid shrinkage holes on the upper part. If shrinkage holes are caused by rolling, secondary drilling should be carried out before tamping. After the hole is formed, the loose soil blocks on the surface should be pushed away from the center of the hole to the surrounding areas to prevent them from falling into the pile hole and affecting the quality of the pile.

[0037] Mixing of lime and soil: Mix the soil and dissolved lime evenly and use them to fill the pile holes. First, sieve the soil and dissolved lime separately. Fresh quicklime blocks should be used as lime materials. The effective calcium oxide content should not be less than 70%, the particle size should not be greater than 70mm, and the powder content (i.e. slaked lime) should not exceed 15%. The mixed lime and soil should be tamped in time and should not be used every other day. The lime dosage and water content of the lime soil should be measured before construction every day to ensure that the lime dosage and water content of the mixed lime and soil meet the requirements.

[0038] Compaction: Under the optimal moisture content, the mixed lime soil is backfilled in layers and compacted to the designed elevation. Before filling the pile hole, the bottom of the hole should be rammed 2-3 times, and then the lime soil is backfilled and compacted in layers under the optimal moisture content. The thickness of each filling is 400-500mm, and the material is symmetrically fed from two directions to avoid the pile body from being crooked due to uneven filling. The lifting height of the rammer is not less than 3m, and the number of ramming is not less than 6 times. Filling can be done only after tamping and compaction. Repeat this process until the designed elevation.

[0039] Track leveling: Evenly spread the cleaned ballast 5 at the predetermined track position and perform leveling operations until all parameters of the track meet the original design requirements.

[0040] The ballast 5 after cleaning is evenly spread on the original predetermined track position to form a roadbed of a certain thickness and width for leveling. Ballasting and leveling operations are performed manually or mechanically, including steps such as adding ballast, tamping, and shifting. These steps need to be repeated many times until the various parameters of the track meet the original design requirements. Finally, the details of the railway sleeper 2 and the stress release of the railway rail 3 are adjusted to ensure the continuity and stability of the track.

[0041] Therefore, the utility model adopts a ballasted weak expansion soft soil railway roadbed subgrade mud and foaming disease treatment facility with the above structure, which is simple and easy to construct, has a significant effect on the treatment of mud and foaming, and can also effectively enhance the bearing capacity and stability of the roadbed and improve the driving safety during the railway operation period.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that they can still modify or equivalently replace the technical solutions of the present invention, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A treatment facility for the disease of mud pumping and gushing in the subgrade bed of a ballast railway subgrade with weak expansive soft soil, including a railway subgrade, characterized in that, It further includes: Lime-soil compaction piles, which are driven into the subgrade bed of the railway subgrade to enhance the bearing capacity and stability of the railway subgrade; Railway sleepers, which are arranged above the railway subgrade; Railway rails, which are arranged above the railway sleepers; Shoulder walls, which are arranged on both sides of the railway subgrade to provide support and protection; Ballast, which is evenly spread between the railway subgrade and the railway sleepers.

2. The treatment facility for the mud pumping and gushing disease of the ballast bed of a ballasted weak-expansion soft soil railway subgrade according to claim 1, characterized in that: The layout spacing of the railway sleepers is 0.6 m.

3. A treatment facility for the disease of mud pumping and gushing in the ballast bed of a ballastless weak-expansion soft soil railway subgrade according to claim 1, characterized in that: The lime-soil compaction piles are arranged between the railway sleepers. The longitudinal spacing of the arrangement positions of the lime-soil compaction piles along the railway rails is 0.60 m, and they are transversely arranged at 0.30 m on both sides of the railway rails respectively. The pile length of the lime-soil compaction piles is 3.5 m, and the pile body diameter D of the lime-soil compaction piles is 150 mm.

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