CN110952387B - Method for controlling settlement of wide embankment of high-speed railway by adopting cement mixing piles - Google Patents
Method for controlling settlement of wide embankment of high-speed railway by adopting cement mixing piles Download PDFInfo
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- CN110952387B CN110952387B CN201911304567.7A CN201911304567A CN110952387B CN 110952387 B CN110952387 B CN 110952387B CN 201911304567 A CN201911304567 A CN 201911304567A CN 110952387 B CN110952387 B CN 110952387B
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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
- E01B2/00—General structure of permanent way
- E01B2/006—Deep foundation of tracks
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil
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Abstract
The invention relates to a settlement control method for a wide embankment of a high-speed railway by adopting cement mixing piles, which comprises the following steps: filling a chemical improved soil layer on a foundation of the reinforced high-speed railway embankment, designing the pile point positions of cement mixing piles on the chemical improved soil layer, designing the depth of the cement mixing piles at each pile point position according to the pile point positions of the cement mixing piles, driving the cement mixing piles into each pile point position, paving a cushion layer on the chemical improved soil layer, and filling a foundation bed bottom layer and a foundation bed surface layer on the cushion layer in sequence. Compared with the prior art, the chemical improved soil is used as embankment filler under a foundation bed layer, the chemical improved soil layer is reinforced by the cement mixing piles, the depth and the density of the cement mixing piles are reduced along with the increase of the distance between the pile point position and the reinforcement area under the main line, the economic cost of the embankment is reduced on the premise of ensuring the safety performance of the embankment, and the settlement amount of the embankment is prevented from exceeding the design specification requirement of a high-speed railway.
Description
Technical Field
The invention relates to a settlement control method for a wide embankment of a high-speed railway, in particular to a settlement control method for a wide embankment of a high-speed railway by adopting cement mixing piles.
Background
At present high-speed railway line includes positive line and to sending out the line, and the positive line generally is located station roadbed middle part, is the linkage interval and runs through the station track, is to drawing forth the generating line's generating line in the station, and it is located positive line both sides to sending out the line, therefore station department embankment width is very big, and it results in the embankment to apply cyclic load to the embankment when the train passes through subsides, and the embankment middle part positive line below settlement volume is big, and the embankment outside is little to sending out line department settlement volume. At present, the settlement control standard of the embankment below the main track of the high-speed railway station embankment is the highest, and in order to avoid the settlement of the main track exceeding the requirement of high-speed railway design code, the full section of the wide embankment at present adopts high-quality filler.
However, the speed of the train from the high-speed railway station to the departure line in China is controlled by the highest lateral turnout passing speed of 160km/h of the turnout, meanwhile, the safety of passengers is considered, the actual speed of the train to the departure line is very low, the degree of uneven settlement of the station embankment is far less than that of a positive line, and the standard of the wide embankment filling required by the departure line is lower in the actual situation. However, in the current standard, the full section of the station embankment is filled according to the high-speed rail standard, and in order to prevent embankment settlement, the same high-quality filler is adopted at the same horizontal plane below the main line and the departure line, which inevitably causes the waste of the high-quality filler below the departure line, and leads to uneconomical construction of the station embankment project.
The existing filler can be A, B, C three types, in order to avoid the situation that the settlement of the main line exceeds the requirement of high-speed railway design specification in the current engineering, the filler needs to be A, B type filler with higher quality, the engineering property of the C type filler is poor, the requirement of long-term safe and comfortable operation of the high-speed railway is difficult to meet by singly using the C type filler, and the chemically improved soil is the worst of the C type filler, has low cost and wide application range, but has unstable mechanical property and durability, and is not recommended to be adopted under certain conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a settlement control method for a wide embankment of a high-speed railway by adopting cement mixing piles.
The purpose of the invention can be realized by the following technical scheme:
a settlement control method for a wide embankment of a high-speed railway by adopting cement mixing piles comprises the following steps:
s1: filling a chemical improved soil layer on the foundation of the reinforced wide and large embankment of the high-speed railway;
s2: designing a pile point position of a cement mixing pile on a chemical improved soil layer;
s3: designing the depth of the cement mixing pile at each pile point position according to the pile point position of the cement mixing pile;
s4: pre-stirring and drilling down a drill rod of a stirrer at a pile point at a uniform speed, lifting the drill rod and simultaneously pumping and grouting after drilling down to a designed depth, spraying the cement slurry to a preset slurry stopping surface on a chemically improved soil layer while stirring the drill rod, pressing the cement slurry into the soil, and completing primary stirring;
s5: pre-stirring and drilling a drill rod of the stirrer at a pile point position at a uniform speed, drilling the drill rod to a position 3m below the top layer of the chemically-modified soil layer, spraying the slurry to a preset slurry stop surface on the chemically-modified soil layer while stirring the drill rod, and repeating the step S5 twice to finish twice re-stirring;
s6: repeating the steps S4-S5 to construct the next pile point position until cement mixing piles are driven into all the pile point positions;
s7: laying a cushion layer on the chemical improved soil layer;
s8: and sequentially filling a foundation bed bottom layer and a foundation bed surface layer on the cushion layer.
The S2 specifically includes:
s21: leveling a chemical improved soil layer, dividing the chemical improved soil layer into a reinforced area and a non-reinforced area, and dividing the reinforced area into a main under-line reinforced area and an under-line reinforced area;
s22: designing and marking pile point positions of the cement mixing piles in a positive offline reinforcing area of the chemically improved soil layer, wherein the pile point positions of the positive offline reinforcing area are uniform in density;
s23: pile point positions of cement mixing piles are designed in a reinforcement area below a starting line of a chemically improved soil layer and marked, and pile point position density of the reinforcement area below the starting line is reduced along with increase of distance between the pile point positions and the reinforcement area below a main line.
The chemical improved soil layer is located in the area below the front line of the high-speed railway and is divided into a reinforcing area below the front line and a non-reinforcing area below the front line, the reinforcing area below the front line is close to the reinforcing area below the front line, and the non-reinforcing area is far away from the reinforcing area below the front line.
The peg position arrangement described in S2 takes the form of a triangle or a square.
The S3 specifically includes:
s31: designing the depth of a cement mixing pile in the main offline reinforcing area, wherein the depth of the cement mixing pile in the main offline reinforcing area is the same as the height of the chemical improved soil layer, and the cement mixing pile located in the main offline reinforcing area penetrates through the chemical improved soil layer from top to bottom;
s32: the depth of the cement mixing pile in the lower reinforcing area of the hair line is designed, the distance between the cement mixing pile in the lower reinforcing area of the hair line and the lower reinforcing area of the main line is obtained, and the depth of the cement mixing pile in the lower reinforcing area of the hair line is reduced along with the increase of the distance between the pile point position and the lower reinforcing area of the main line.
When cement mixing piles are driven in the S4-S6, if the center distance between two adjacent cement mixing piles is smaller than the diameter of the piles, pile bodies of the two adjacent cement mixing piles are meshed with each other.
The height of the preset stop level in S4 and S5 is 0.5m above the chemically improved soil layer.
The cushion layer in S7 includes that first order joins in marriage rubble layer, geogrid layer and second level and join in marriage the rubble layer, first order join in marriage the rubble layer and be located the top on chemical improvement soil layer, geogrid layer be located first order and join in marriage rubble layer top, second level join in marriage the rubble layer and be located geogrid layer top.
The thickness of the first-stage stone matching layer and the second-stage stone matching layer is 10 cm.
Compared with the prior art, the invention has the following advantages:
(1) according to the invention, chemically improved soil with low economic cost and unstable mechanical property and durability is used as embankment filler under a foundation bed layer, and a cement mixing pile is used for reinforcing the chemically improved soil layer, so that the economic cost of the embankment is reduced, meanwhile, the embankment settlement is prevented from exceeding the requirement of high-speed railway design specification, and the safety performance is ensured;
(2) according to the invention, the cement mixing piles arranged in the reinforcement area under the main line penetrate through the chemically improved soil layer deeply, the pile point position density is uniform, the main line settlement is prevented from exceeding the requirement of high-speed railway design specification, and the safety performance of the embankment is ensured;
(3) the depth and the density of the cement mixing piles distributed in the lower reinforcing area of the departure line are reduced along with the increase of the distance between the pile point position and the lower reinforcing area of the main line, so that the middle part of the bearing capacity and the anti-deformation capacity of the embankment is large, the two sides of the embankment are small, the transverse uneven settlement is reduced, the stable transition of the deformation is realized, the settlement amount of the embankment under the departure line can be prevented from exceeding the requirement of high-speed railway design specification, the number of the cement mixing piles and the material consumption can be reduced, and the economic cost is reduced;
(4) the arrangement form of the pile point positions of the cement mixing pile adopts a triangle or a square, and the density of the cement mixing pile can be adjusted by adjusting the side length of the triangle or the square formed by the pile point positions.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a cross-sectional view of a wide embankment for a high-speed railway according to the present invention;
FIG. 3 is a plan view of the cement mixing pile of the present invention in a triangular arrangement of pile point positions;
fig. 4 is a plan view of the arrangement of the pile point positions of the cement mixing pile of the present invention in a square shape.
The foundation comprises a chemical improved soil layer 1, a chemical improved soil layer 2, a reinforcement area 2-1, a reinforcement area under a main line 2-2, a reinforcement area under a arrival line 3, a cement stirring pile 4, a cushion layer 4-1, a first-level crushed stone layer 4-2, a geogrid layer 4-3, a second-level crushed stone layer 5, a foundation bed bottom layer 6, a foundation bed surface layer 7, a foundation 8, a main line 9, an arrival line 10 and a reinforcement area.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. Note that the following description of the embodiments is merely a substantial example, and the present invention is not intended to be limited to the application or the use thereof, and is not limited to the following embodiments.
Examples
A method for controlling the settlement of a wide embankment of a high-speed railway by adopting cement mixing piles is characterized in that a chemical improved soil layer 1 is filled on a foundation 7 of the high-speed railway, the chemical improved soil has low cost and wide application range, but the mechanical property and the durability are unstable, then the cement mixing pile 3 is driven into the chemically improved soil layer 1, the chemically improved soil layer 1 is reinforced, the depth and the density of the cement mixing pile 3 are reduced along with the increase of the distance between the pile point position and the 2-1 of the reinforcement area under the main line, the middle part of the bearing capacity and the anti-deformation capacity of the embankment is large, the two sides of the embankment are small, the main line settlement and the transverse uneven settlement are reduced, the stable transition of the deformation is realized, then, a cushion layer 4 is paved, a foundation bed bottom layer 5 and a foundation bed surface layer 6 are filled, the paving of the wide and large embankment of the high-speed railway is completed, the economic cost is effectively reduced, and the settlement amount of the wide and large embankment of the high-speed railway is prevented from exceeding the requirement of design Specification of the high-speed railway.
As shown in fig. 1 and fig. 2, the control method includes the following steps:
s1: and filling a chemical improved soil layer on the foundation of the reinforced wide and large embankment of the high-speed railway.
The chemically improved soil is the worst of C-type fillers, the cost is low, the application range is wide, but the mechanical property and the durability are unstable, and the chemical improved soil layer 1 is formed by filling materials on the foundation 7 of the method by adopting the chemically improved soil, so the economic cost is low.
S2: pile point positions of cement mixing piles 3 are designed on the chemically improved soil layer 1.
Step S2 specifically includes:
s21: s21: leveling a chemically improved soil layer 1, dividing the chemically improved soil layer 1 into a reinforced area 2 and a non-reinforced area 10, and dividing the reinforced area 2 into a reinforcement area 2-1 under a main line and a reinforcement area 2-2 under a main line, specifically, the area of the chemically improved soil layer 1 below a main line 8 of a high-speed railway is the reinforcement area 2-1 under the main line, the area of the chemically improved soil layer 1 below a main line 9 of the high-speed railway is divided into the reinforcement area 2-2 under the main line and the non-reinforced area 10, the reinforcement area 2-2 under the main line is close to the reinforcement area 2-1 under the main line, and the non-reinforced area 10 is far away from the reinforcement area 2-1 under the main line;
s22: designing and marking the pile point position of the cement mixing pile 3 in the main line lower reinforcing area 2-1 of the chemically improved soil layer 1, wherein the pile point position density of the main line lower reinforcing area 2-1 is uniform;
s23: pile point positions of the cement mixing piles 3 are designed in the strengthening area 2-2 below the starting line of the chemically improved soil layer 1 and marked, and pile point position density of the strengthening area 2-2 below the starting line is reduced along with the increase of the distance between the pile point positions and the strengthening area 2-1 below the main line.
Pile point position density of the reinforcement area 2-1 under the main line is uniform, strength under the main line with higher requirements is ensured, safety performance of the embankment is guaranteed, pile point position density of the reinforcement area 2-2 under the departure line is reduced along with increase of distance between the pile point position and the reinforcement area 2-1 under the main line, and on the premise that low embankment compound modulus is suitable for low settlement control standards under the departure line, economic cost is reduced.
As shown in fig. 3 and 4, the arrangement form of the pile point positions adopts a triangle or a square, the density of the pile point positions is adjusted by adjusting the side length of the triangle or the square, the composite modulus of the embankment after arrangement meets the requirement on the roadbed filling in the high-speed railway design specification, and the embankment filling requirement when the design speed is 120km/h in the railway roadbed design specification is met in a routing area.
S3: and designing the depth of the cement mixing pile 3 at each pile point position according to the pile point position of the cement mixing pile 3.
Step S3 specifically includes:
s31: designing the depth of the cement mixing pile 3 of the reinforcement area 2-1 under the main line: the depth of the cement mixing piles 3 in the front line lower reinforcing area 2-1 is the same as the height of the chemical improved soil layer 1, and the cement mixing piles 3 in the front line lower reinforcing area 2-1 penetrate through the chemical improved soil layer 1 from top to bottom;
s32: the depth of the cement mixing pile 3 of the lower reinforcing area 2-2 of the initial line is designed, the distance between the cement mixing pile 3 of the lower reinforcing area 2-2 of the initial line and the lower reinforcing area 2-1 of the main line is obtained, and the depth of the cement mixing pile 3 located in the lower reinforcing area 2-2 of the initial line is reduced along with the increase of the distance between the pile point position and the lower reinforcing area 2-1 of the main line.
The depth of the cement mixing piles 3 in the reinforcement area 2-1 under the main line penetrates through the chemical improved soil layer 1, the strength of the embankment under the main line is ensured, the safety performance of the embankment is ensured, the depth of the cement mixing piles 3 in the reinforcement area 2-2 under the outgoing line is reduced along with the increase of the distance between the pile point position and the reinforcement area 2-1 under the main line, on the premise that the safety performance under the outgoing line is met, building consumables are reduced, and economic cost is effectively reduced.
S4: and (3) pre-stirring and drilling down a drill rod of the stirrer at a pile point position at a uniform speed, lifting the drill rod and starting a pump for grouting after drilling down to the designed depth, spraying the cement slurry to a preset slurry stop surface of 0.5m on the top layer of the chemically improved soil layer 1 while stirring the drill rod, pressing the cement slurry into the soil, and completing primary stirring.
S5: and (3) pre-stirring and drilling a drill rod of the stirrer at a pile point position at a uniform speed, drilling the drill rod to a position 3m below the top layer of the chemically improved soil layer 1, spraying the slurry to a preset slurry stop surface of 0.5m above the top layer of the chemically improved soil layer 1 while stirring, and repeating the step S5 twice to finish twice re-stirring.
S6: and repeating the steps S4-S5 to construct the next pile point position until all the pile point positions are driven into the cement mixing pile 3.
When the cement mixing piles 3 are driven in the positions S4-S6, if the center distance between two adjacent cement mixing piles 3 is smaller than the pile diameter, pile bodies of the two adjacent cement mixing piles 3 are meshed with each other, and the strength of the pile bodies is improved.
S7: laying a cushion layer 4 on a chemically modified soil layer 1, specifically laying a second-stage crushed stone layer 4-3 on the chemically modified soil layer 1, laying a geogrid layer 4-2 on the second-stage crushed stone layer 4-3, laying a first-stage crushed stone layer 4-1 on the geogrid layer 4-2, wherein the thickness of the first-stage crushed stone layer 4-1 and the second-stage crushed stone layer 4-3 is 10 cm.
The setting of bed course 4 can make the load that the operation period foundation bed produced more even when transmitting substructure, coordinates cement mixing pile 3 and embankment filler deformation, avoids the horizontal inhomogeneous settlement of road bed.
S8: and a foundation bed bottom layer 5 and a foundation bed surface layer 6 are sequentially filled on the cushion layer 4.
The above embodiments are merely examples and do not limit the scope of the present invention. These embodiments may be implemented in other various manners, and various omissions, substitutions, and changes may be made without departing from the technical spirit of the present invention.
Claims (8)
1. A settlement control method for a wide embankment of a high-speed railway by adopting cement mixing piles is characterized by comprising the following steps:
s1: filling a chemical improved soil layer (1) on a foundation (7) of the reinforced wide and large embankment of the high-speed railway;
s2: designing the pile point position of a cement mixing pile (3) on a chemical improved soil layer (1);
s3: designing the depth of the cement mixing pile (3) at each pile point position according to the pile point position of the cement mixing pile (3);
s4: pre-stirring and drilling a drill rod of a stirrer at a pile point at a uniform speed, lifting the drill rod and starting a pump to perform grouting at the same time after the drill rod is drilled to a designed depth, spraying the grout to a preset grout stop surface on a chemical improved soil layer (1) while stirring the drill rod, pressing the grout into the soil, and completing primary stirring;
s5: pre-stirring and drilling a drill rod of the stirrer at a pile point position at a uniform speed, drilling the drill rod to a position 3m below the top layer of the chemically improved soil layer (1), spraying the slurry to a preset slurry stopping surface on the chemically improved soil layer (1) while stirring the drill rod, and repeating the step S5 twice to finish twice re-stirring;
s6: repeating the steps S4-S5 to construct the next pile point position until all the pile point positions are driven into the cement mixing pile (3);
s7: paving a cushion layer (4) on the chemically improved soil layer (1);
s8: a foundation bed bottom layer (5) and a foundation bed surface layer (6) are sequentially filled on the cushion layer (4),
the S2 specifically includes:
s21: leveling a chemically modified soil layer (1), dividing the chemically modified soil layer (1) into a reinforced area (2) and a non-reinforced area (10), and dividing the reinforced area (2) into a main line lower reinforced area (2-1) and a starting line lower reinforced area (2-2);
s22: designing and marking the pile point position of the cement mixing pile (3) in the main line lower reinforcing area (2-1) of the chemically improved soil layer (1), wherein the pile point position density of the main line lower reinforcing area (2-1) is uniform;
s23: pile point positions of the cement mixing piles (3) are designed in a lower reinforcing area (2-2) from a starting line of the chemically improved soil layer (1) and marked, and pile point position density of the lower reinforcing area (2-2) from the starting line is reduced along with the increase of the distance between the pile point positions and the lower reinforcing area (2-1) from a main line.
2. The method for controlling the settlement of the wide and large embankment of the high-speed railway by using the cement mixing piles according to claim 1, wherein the area of the chemically modified soil layer (1) below the head line (8) of the high-speed railway is a head line lower reinforced area (2-1), the area of the chemically modified soil layer (1) below the head line (9) of the high-speed railway is divided into a head line lower reinforced area (2-2) and a non-reinforced area (10), the head line lower reinforced area (2-2) is close to the head line lower reinforced area (2-1), and the non-reinforced area (10) is far away from the head line lower reinforced area (2-1).
3. The method for controlling settlement of a wide and large embankment for a high-speed railway using cement mixing piles according to claim 1, wherein the pile point location arrangement form of S2 is a triangle or a square.
4. The method for controlling the settlement of the wide and large embankment of the high-speed railway by using the cement mixing piles according to claim 1, wherein the step S3 is specifically as follows:
s31: designing the depth of a cement mixing pile (3) of the main line lower reinforcing area (2-1), wherein the depth of the cement mixing pile (3) of the main line lower reinforcing area (2-1) is the same as the height of the chemical improvement soil layer (1), and the cement mixing pile (3) positioned in the main line lower reinforcing area (2-1) penetrates through the chemical improvement soil layer (1) from top to bottom;
s32: the depth of the cement mixing pile (3) in the lower reinforcing area (2-2) of the initial line is designed, the distance between the cement mixing pile (3) which obtains the lower reinforcing area (2-2) of the initial line and the lower reinforcing area (2-1) of the main line is obtained, and the depth of the cement mixing pile (3) which is positioned in the lower reinforcing area (2-2) of the initial line is reduced along with the increase of the distance between the pile point position and the lower reinforcing area (2-1) of the main line.
5. The method for controlling settlement of a wide embankment for a high-speed railway using cement mixing piles according to claim 1, wherein when the cement mixing piles (3) are driven in the driving steps S4 to S6, if the center distance between two adjacent cement mixing piles (3) is smaller than the diameter of the piles, the pile bodies of the two adjacent cement mixing piles (3) are engaged with each other.
6. The settlement control method of a wide embankment for a high speed railway using cement mixing piles according to claim 1, wherein the predetermined grout stop level in S4, S5 is 0.5m above the chemically modified soil layer (1).
7. The method for controlling settlement of a wide and large embankment for a high-speed railway using cement-mixed piles according to claim 1, wherein the underlayment (4) in S7 comprises a first-stage gravel layer (4-1), a geogrid layer (4-2) and a second-stage gravel layer (4-3), the first-stage gravel layer (4-1) is located above the chemically modified soil layer (1), the geogrid layer (4-2) is located above the first-stage gravel layer (4-1), and the second-stage gravel layer (4-3) is located above the geogrid layer (4-2).
8. The method for controlling the settlement of the wide and large embankment of the high-speed railway using the cement mixing piles according to claim 7, wherein the thickness of the first-stage gravel layer (4-1) and the second-stage gravel layer (4-3) is 10 cm.
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| JPS60152720A (en) * | 1984-01-18 | 1985-08-12 | Toyo Kiko:Kk | Method of improving railroad ground having lower part reinforced by hardener |
| CN101144256B (en) * | 2007-09-30 | 2010-04-14 | 中铁二院工程集团有限责任公司 | Slag-free orbit reinforced concrete pile net structure roadbed and construction method thereof |
| CN101509248B (en) * | 2009-02-26 | 2011-04-20 | 上海交通大学 | Control road for differential settlement at exchanging position of road and structure |
| CN104358196B (en) * | 2014-10-11 | 2016-08-24 | 杭州江润科技有限公司 | Highway open to traffic Embankment Subsidence disposes the construction method of structure |
| CN208649807U (en) * | 2017-11-30 | 2019-03-26 | 中铁第四勘察设计院集团有限公司 | For eliminating the road structure of the high embankment lateral variation sedimentation in high-speed railway abrupt slope |
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