CN110158370B - Coarse-grained saline soil embankment structure of ballast track at speed of 200-250 km/h and construction method - Google Patents
Coarse-grained saline soil embankment structure of ballast track at speed of 200-250 km/h and construction method Download PDFInfo
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- CN110158370B CN110158370B CN201910414947.XA CN201910414947A CN110158370B CN 110158370 B CN110158370 B CN 110158370B CN 201910414947 A CN201910414947 A CN 201910414947A CN 110158370 B CN110158370 B CN 110158370B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/001—Track with ballast
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
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Abstract
Coarse-grained saline soil embankment structure of ballast track at speed of 200-250 km/h per hour and construction method thereof, so as to meet arch and sinking deformation control requirements on high-speed railway and effectively meet requirementsThe technical problem that coarse-grained salinized soil is used as the high-speed railway embankment filler is solved. The embankment structure is composed of an embankment body lower structure layer, an embankment body upper structure layer, a foundation bed bottom layer and a foundation bed surface layer which are sequentially paved above a foundation from bottom to top, wherein the embankment body lower structure layer, the embankment body upper structure layer and the foundation bed bottom layer are constructed by coarse-grained saline soil, and the foundation bed surface layer is filled by non-saline soil; the content of the soluble salt in the coarse-grained saline soil of the lower structure layer of the embankment body, the upper structure layer of the embankment body and the bottom layer of the foundation bed meets the following requirements listed in the following table 1: TABLE 1
Description
Technical Field
The invention relates to the technical field of a ballast track embankment of a high-speed railway, in particular to a coarse-grained saline soil embankment structure of a ballast track at a speed of 200-250 km/h and a construction method thereof.
Technical Field
The saline soil is a general name of soil bodies with different degrees of salinization and is widely distributed in arid and semiarid regions and coastal regions of various countries. The saline soil generally comprises coarse-particle saline soil and fine-particle saline soil, the mechanical property of the coarse-particle saline soil is good, the coarse-particle saline soil has a precedent of engineering as embankment filler in highway construction, but the coarse-particle saline soil is not common as embankment filler of high-speed railways all over the world.
In a saline soil area, a high-speed railway line inevitably passes through a saline desert area, high-quality embankment fillers which do not contain salt along the line are extremely short, and the engineering investment is sharply increased by transporting the high-quality embankment fillers which do not contain salt or digging rock blocks, however, saline soil has bad engineering characteristics of salt expansion, solution sinking, erosion and the like, and the top surface of an embankment is easy to arch or sink and exceed the limit. Therefore, how to select and apply coarse saline soil to construct a high-speed railway embankment is a difficult problem faced by current engineering technicians, and a corresponding embankment structure and a construction method are urgently needed to be provided for solving the problem.
Disclosure of Invention
The invention aims to solve the technical problem of providing a coarse-grained saline soil embankment structure of a ballast track at the speed of 200-250 km/h and a construction method thereof, so as to meet the requirement of deformation control of arching and sinking on a high-speed railway and effectively solve the technical problem of using coarse-grained saline soil as a high-speed railway embankment filler.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a coarse-grained saline soil embankment structure of a ballast track with the speed per hour of 200-250 km/h, which is characterized in that: the embankment structure is composed of an embankment body lower structure layer, an embankment body upper structure layer, a foundation bed bottom layer and a foundation bed surface layer which are sequentially paved above a foundation from bottom to top, wherein the embankment body lower structure layer, the embankment body upper structure layer and the foundation bed bottom layer are constructed by coarse-grained saline soil, and the foundation bed surface layer is filled by non-saline soil; the content of the soluble salt in the coarse-grained saline soil of the lower structure layer of the embankment body, the upper structure layer of the embankment body and the bottom layer of the foundation bed meets the following requirements listed in the following table 1:
TABLE 1
The content of the soluble salt refers to the saline soil and the constructionSum of the lyotropic salt content with water, R in the above table5The ratio of the coarse grain to the fine grain of the coarse grain saline soil is, and the depth corresponding to the situation that the soil body below the top surface of the embankment is not subjected to sinking is adopted as the sinking depth;
according to the grading curve of the coarse grain saline soil particles, determining the ratio R of the coarse grain to the fine grain of the coarse grain saline soil by the following formula5：
In the formula, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil; a is the particle diameter d>The soil content of 5mm accounts for the percentage of the total mass, unit%; b is the percentage of the soil content with the grain diameter of 0.25mm < d < 5mm in the total mass, unit percent.
The invention also provides a construction method of the coarse-grained saline soil embankment structure of the ballast track at the speed of 200-250 km/h, which comprises the following steps:
selecting a coarse grain saline soil sampling field, collecting a soil sample, determining a coarse grain saline soil particle grading curve through indoor soil screening and chemical titration tests, and determining the content of soluble salt in the coarse grain saline soil in unit percent;
② determining the ratio of coarse grain to fine grain of the coarse grain saline soil according to the grading curve of the coarse grain saline soil5；
③ determining the ratio R of coarse grain to fine grain of the coarse grain saline soil5Dividing the soil sample of the soil sampling field into a fine particle group, a medium particle group and a coarse particle group, compacting the soil sample of the soil sampling field by using construction water in a layering manner, then measuring the content of soluble salt of the compacted soil sample, judging whether the sum of the content of the soluble salt of the soil sample of the soil sampling field and the construction water meets the requirement of the table 1, and if the content of the soluble salt of the soil sampling field and the construction water does not meet the requirement of the table 1, repeating the operation of ① and ② until the requirement of the table 1 is met;
collecting embankment fillers from the soil sampling field selected in the step one, filling in layers, and rolling in layers until the top surface of the base layer (30) of the embankment is reached;
collecting a compacted soil sample of a structural layer (20) and a foundation bed bottom layer (30) on the embankment body, determining a salt expansion coefficient and a solution coefficient of the compacted soil sample through an indoor salt expansion test and a solution test, and according to the indexes listed in the following table 2:
TABLE 2
And (5) checking indexes to judge whether the quality of the coarse-grained saline soil embankment is qualified.
The invention has the beneficial effects that the arching amount of the roadbed is not more than 8mm and the sedimentation amount is not more than 100mm as control standards, and the analysis of salt swelling and solution sinking tests of more than 200 groups of 10 kinds of coarse grain saline soil is combined, and the ratio of the coarse grain to the fine grain R is comprehensively considered5On the basis of the content of soluble salt, a coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h and a construction method are provided, so that the problem that a saline soil area is lack of high-quality embankment filler is effectively solved, the deformation of upward arching and sinking of the embankment can be effectively controlled, and the embankment deformation is ensured to meet the design requirement of a high-speed railway.
Drawings
FIG. 1 is a schematic structural diagram of a coarse-grained saline soil embankment of a ballast track at a speed of 200-250 km/h.
FIG. 2 is a particle grading curve diagram of coarse salinized soil in an earth site in the embodiment of the invention.
The figures show the components and corresponding references: the embankment body lower structural layer 10, the embankment body upper structural layer 20, the foundation bed bottom layer 30 and the foundation bed surface layer 40.
Detailed Description
The invention is further illustrated by the following specific examples in conjunction with the accompanying drawings.
Referring to fig. 1, the coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h comprises an embankment body lower structural layer 10, an embankment body upper structural layer 20, a foundation bed bottom layer 30 and a foundation bed surface layer 40 which are sequentially paved above a foundation from bottom to top, wherein the embankment body lower structural layer 10, the embankment body upper structural layer 20 and the foundation bed bottom layer 30 are constructed by coarse-grained saline soil, and the foundation bed surface layer 40 is filled by non-saline soil. The content of the soluble salt in the coarse-grained saline soil of the lower structure layer 10 of the embankment body, the upper structure layer 20 of the embankment body and the bottom layer 30 of the foundation bed meets the following requirements listed in the following table 1:
TABLE 1
The content of the soluble salt refers to the sum of the content of the soluble salt of the saline soil and the construction water, in the table, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil is shown, and the depth of the dissolution sinking is the depth corresponding to the situation that the soil body below the top surface of the embankment is not subjected to the dissolution sinking.
According to the grading curve of the coarse grain saline soil particles, determining the ratio R of the coarse grain to the fine grain of the coarse grain saline soil by the following formula5：
In the formula, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil; a is the particle diameter d>The soil content of 5mm accounts for the percentage of the total mass, unit%; b is the percentage of the soil content with the grain diameter of 0.25mm < d < 5mm in the total mass, unit percent.
Preferably, the bed top layer 40 has a thickness of 0.7m and the bed bottom layer 30 has a thickness of 2.3 m.
The upper structural layer 20 of the embankment body is an embankment body within the depth range of the settlement.
The lower structural layer 10 of the embankment body is an embankment body below the depth of the settlement.
The lower structural layer 10 of the embankment body, the upper structural layer 20 of the embankment body, the bottom layer 30 of the foundation bed and the surface layer 40 of the foundation bed meet the requirements of high-speed railway design specifications (TB10621-2014) and railway subgrade design specifications (TB 10001-2016).
Referring to fig. 1, the method for constructing the coarse-grained saline soil embankment structure of the ballast track at the speed of 200-250 km/h at open time comprises the following steps:
selecting a coarse grain saline soil sampling field, collecting a soil sample, determining a coarse grain saline soil particle grading curve through indoor soil screening and chemical titration tests, and determining the content of soluble salt in the coarse grain saline soil in unit percent;
② determining the ratio of coarse grain to fine grain of the coarse grain saline soil according to the grading curve of the coarse grain saline soil5；
③ determining the ratio R of coarse grain to fine grain of the coarse grain saline soil5Dividing the soil sample of the soil sampling field into a fine particle group, a medium particle group and a coarse particle group, compacting the soil sample of the soil sampling field by using construction water in a layering manner, then measuring the content of soluble salt of the compacted soil sample, judging whether the sum of the content of the soluble salt of the soil sample of the soil sampling field and the construction water meets the requirement of the table 1, and if the content of the soluble salt of the soil sampling field and the construction water does not meet the requirement of the table 1, repeating the operation of ① and ② until the requirement of the table 1 is met;
fourthly, collecting embankment fillers from the soil borrowing field selected in the step one, filling in layers, and rolling in layers until the top surface of the embankment foundation bed bottom layer 30 is reached;
collecting compacted soil samples of the upper structural layer 20 and the bottom layer 30 of the foundation bed of the embankment body, determining the salt expansion coefficient and the solution coefficient of the compacted soil samples through an indoor salt expansion test and a solution test, and according to the indexes listed in the following table 2:
TABLE 2
And (5) checking indexes to judge whether the quality of the coarse-grained saline soil embankment is qualified.
And fifthly, executing an indoor salt expansion test and a dissolution sinking test according to 'building code of salinized soil region' (SY/T0317-2012).
Examples
Referring to fig. 1 and 2, a ballast track embankment of a high-speed railway with a speed of 300km/h at a given time is built in a saline soil area, most soil borrowing fields in the area are saline soil, the ballast track embankment of the high-speed railway with the speed of 300km/h at the given time is built by adopting the structure and the method provided by the method, and the concrete steps are as follows:
① selecting coarse grain salinized soil sampling field, collecting 4 groups of soil samples (S-1-S-4), and determining the grading curve of coarse grain salinized soil particles through indoor soil screening and chemical titration test, as shown in figure 2, and determining the content m of easily soluble salt in coarse grain salinized soil1See table 3;
② according to the step ① grading curve of the coarse salinized soil particles, the ratio of the coarse particles to the fine particles R of the coarse salinized soil is determined by the following formula5
In the formula, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil; a is the particle diameter d>The soil content of 5mm accounts for the percentage of the total mass, unit%; b is the percentage of the soil content with the grain diameter of 0.25mm to d to 5mm in the total mass, unit percent;
calculated R5See table 3.
TABLE 3 content of soluble salts and R in 4 groups of soil samples from coarse salinized soil sampling field5Determination
③ determined according to step ②5With the table 1, 4 groups of soil samples in the soil sampling field are divided into medium-grain groups (see table 4), the soil samples in the soil sampling field are compacted by water for construction in a layered manner, and then the content m of the soluble salt in the compacted soil samples is measured2(see table 4); calculating the control target [ m ] of the soluble salt content of different parts of the roadbed according to the table 1](see Table 4). By combining table 1 and table 4, it can be determined that the total content of the soluble salts in the 4 groups of soil samples in the soil sampling field and the construction water meets the control requirements of the foundation bed bottom layer 30, the upper structure layer 20 of the embankment body and the lower structure layer 10 of the embankment body.
TABLE 4 determination of control targets of 4 groups of soil samples in coarse salinized soil sampling field
Collecting embankment fillers from the soil sampling field selected in the step one, filling in layers, and rolling in layers until the top surface of the bottom layer 3 of the embankment foundation bed;
collecting compacted soil samples of the upper structural layer 2 and the bottom layer 3 of the foundation bed of the embankment body, determining the salt expansion coefficient and the dissolution coefficient of the compacted soil samples (see table 5) through an indoor salt expansion test and a dissolution test, and judging according to the test indexes in the table 2 to know that the quality of the coarse-grained saline soil embankment is qualified.
Table 5 test results of roadbed quality inspection
The invention takes the arching amount of the roadbed not more than 8mm and the sedimentation amount not more than 100mm as control standards, combines the analysis of salt swelling and solution sinking tests of more than about 200 groups of 10 kinds of coarse grain saline soil, and comprehensively considers the ratio of the coarse grain to the fine grain R5On the basis of the content of soluble salt, a coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h and a construction method are provided, so that the problem that a saline soil area is lack of high-quality embankment filler is effectively solved, the deformation of upward arching and sinking of the embankment can be effectively controlled, and the embankment deformation is ensured to meet the design requirement of a high-speed railway.
The above description is only to illustrate some principles of the coarse saline soil embankment structure of the ballast track at the speed of 200-250 km/h and the construction method thereof, and the present invention is not limited to the specific structure and the application range shown and described, so all the corresponding modifications and equivalents which may be utilized belong to the patent scope applied by the present invention.
Claims (5)
1. There is tiny fragments of stone, coal, etc. track coarse grain saline soil embankment structure at speed of 200 ~ 250km/h, characterized by: the embankment structure is composed of an embankment body lower structural layer (10), an embankment body upper structural layer (20), a foundation bed bottom layer (30) and a foundation bed surface layer (40) which are sequentially paved above a foundation from bottom to top, wherein the embankment body lower structural layer (10), the embankment body upper structural layer (20) and the foundation bed bottom layer (30) are constructed by coarse-grained saline soil, and the foundation bed surface layer (40) is filled by non-saline soil; the content of the soluble salt in the coarse-grained saline soil of the lower structure layer (10) of the embankment body, the upper structure layer (20) of the embankment body and the bottom layer (30) of the foundation bed meets the following requirements listed in the following table 1:
the content of the soluble salt refers to the sum of the content of the soluble salt of the saline soil and the construction water, in the table, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil is used, and the depth of the dissolution sinking is the depth corresponding to the situation that the soil body below the top surface of the embankment is not subjected to the dissolution sinking;
according to the grading curve of the coarse grain saline soil particles, determining the ratio R of the coarse grain to the fine grain of the coarse grain saline soil by the following formula5：
In the formula, R5The ratio of the coarse grain to the fine grain of the coarse grain saline soil; a is the particle diameter d>The soil content of 5mm accounts for the percentage of the total mass, unit%; b is the percentage of the soil content with the grain diameter of 0.25mm < d < 5mm in the total mass, unit percent.
2. The coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h according to claim 1, characterized in that: the thickness of the surface layer (40) of the foundation bed is 0.7m, and the thickness of the bottom layer (30) of the foundation bed is 2.3 m.
3. The coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h according to claim 1, characterized in that: the upper structural layer (20) of the embankment body is the embankment body within the depth range of the settlement.
4. The coarse-grained saline soil embankment structure with ballast tracks at the speed of 200-250 km/h according to claim 1, characterized in that: the lower structural layer (10) of the embankment body is an embankment body below the depth of the settlement.
5. The construction method of the coarse saline soil embankment structure with the ballast track at the speed of 200-250 km/h according to any one of claims 1-4, comprising the following steps:
selecting a coarse grain saline soil sampling field, collecting a soil sample, determining a coarse grain saline soil particle grading curve through indoor soil screening and chemical titration tests, and determining the content of soluble salt in the coarse grain saline soil in unit percent;
② determining the ratio of coarse grain to fine grain of the coarse grain saline soil according to the grading curve of the coarse grain saline soil5；
③ determining the ratio R of coarse grain to fine grain of the coarse grain saline soil5Dividing the soil sample of the soil sampling field into a fine particle group, a medium particle group and a coarse particle group, compacting the soil sample of the soil sampling field by using construction water in a layering manner, then measuring the content of soluble salt of the compacted soil sample, judging whether the sum of the content of the soluble salt of the soil sample of the soil sampling field and the construction water meets the requirement of the table 1, and if the content of the soluble salt of the soil sampling field and the construction water does not meet the requirement of the table 1, repeating the operation of ① and ② until the requirement of the table 1 is met;
collecting embankment fillers from the soil sampling field selected in the step one, filling in layers, and rolling in layers until the top surface of the base layer (30) of the embankment is reached;
collecting a compacted soil sample of a structural layer (20) and a foundation bed bottom layer (30) on the embankment body, determining a salt expansion coefficient and a solution coefficient of the compacted soil sample through an indoor salt expansion test and a solution test, and according to the indexes listed in the following table 2:
and (5) checking indexes to judge whether the quality of the coarse-grained saline soil embankment is qualified.
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| DE3168301D1 (en) * | 1980-07-29 | 1985-02-28 | Becker Bau Gmbh & Co Kg | Method for soil stabilisation |
| CN101245574A (en) * | 2007-02-14 | 2008-08-20 | 中国神华能源股份有限公司 | Method for building over loading railway road-bed on salting ground |
| UA27949U (en) * | 2007-05-21 | 2007-11-26 | Prydniprovska State Acad Eng | Road bed at saline soils |
| CN103290750B (en) * | 2013-06-04 | 2015-10-07 | 北京航空航天大学 | A kind of road foundation of the cementing salinized soil containing villaumite, basic unit, subbase |
| CN106555368B (en) * | 2017-01-22 | 2018-08-14 | 中铁二院工程集团有限责任公司 | Saline soil area high-speed railway embankment reinforcing construction |
| CN107401158A (en) * | 2017-05-05 | 2017-11-28 | 中国电力工程顾问集团西北电力设计院有限公司 | A kind of processing method for Coarse Saline ground |
| CN109086511B (en) * | 2018-07-24 | 2022-03-25 | 中铁二院工程集团有限责任公司 | Coarse-grained saline soil embankment structure design method based on uplift deformation control |
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