CN109371763B - Construction method of high-groundwater-level low-filling shallow-excavation expansive soil subgrade - Google Patents
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- CN109371763B CN109371763B CN201811376694.3A CN201811376694A CN109371763B CN 109371763 B CN109371763 B CN 109371763B CN 201811376694 A CN201811376694 A CN 201811376694A CN 109371763 B CN109371763 B CN 109371763B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
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- E01B2/00—General structure of permanent way
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Abstract
The invention relates to the technical field of track roadbed structures, in particular to a construction method of a high-groundwater-level low-filling shallow-excavation expansive soil roadbed. Excavating foundation soil to the bottom surface of the roadbed bed; constructing a reinforced concrete pile on the bottom surface of the roadbed; pouring reinforced concrete raft plates; pouring a bearing plate; backfilling infiltration soil on the two sides of the reinforced concrete raft plate and the bearing plate; filling a foundation bed filler layer on the upper end face of the bearing plate; and constructing a drainage ditch on the foundation on one side of the permeable soil far away from the roadbed, communicating the drainage ditch with the permeable soil, and discharging underground water below and on two sides of the reinforced concrete raft plate to enable the filler on the bearing plate to be in a dry state. The roadbed structure fully integrates and utilizes the integral structures of the piles and the raft plates, the filler replacement and the drainage height limitation, and successfully solves the problems of the upper arch risk of the expansion of the expansive soil under the action of water saturation and the grout-turning and mud-emitting diseases of the foundation bed.
Description
Technical Field
The invention relates to the technical field of track roadbed structures, in particular to a construction method of a high-groundwater-level low-filling shallow-excavation expansive soil roadbed.
Background
The high-speed railway low-filling shallow-digging expansive soil subgrade under the high underground water level is generally filled with water and soil in a foundation bed range, and the subgrade is treated by adopting a pile-net composite subgrade. The treatment measure can meet the requirement of subgrade settlement control, but still has some problems for the high-speed railway with the deformation requirement of millimeter level: at present, some arch-up diseases occur to some operating high-speed railways successively due to water absorption and expansion of expansive soil, the anti-arch-up effect is not fully considered in pile-net composite foundations, the expansive soil under high groundwater level is easy to expand and deform under the water saturation effect, the roadbed is easy to arch up when the filling weight cannot resist the arch-up load after the filling treatment, the track structure is seriously crushed and damaged, and the driving safety is threatened; meanwhile, the foundation bed under the high underground water level is soaked by water, and the defects of slurry turning and mud pumping are easy to occur under the high-speed dynamic load reciprocating operation of the train, so that the roadbed is extruded outwards and the track sinks, and the stability of the high-speed railway train is influenced.
The invention discloses a roadbed construction method with a pile raft structure, which is a Chinese invention patent with the patent number of CN106049196A and the name of CN106049196A, wherein the Chinese invention patent is a roadbed construction method of a flexible pile and pile raft combined ballastless track with the same section. However, the structure only considers the action of underground water right below the roadbed actually, the underground water on two sides of the roadbed can also have adverse effects on the roadbed due to the mobility of the underground water, and the slurry turning and mud pumping diseases are easy to occur.
Disclosure of Invention
The invention aims to solve the problem that the existing pile raft structure in the background art is easy to cause roadbed diseases when applied to high-underground water level areas, and provides a construction method of a low-fill shallow-excavation expansive soil roadbed at a high-underground water level.
The technical scheme of the invention is as follows: a construction method of a high-groundwater-level low-filling shallow-digging expansive soil subgrade is characterized by comprising the following steps: the method comprises the following steps:
1. excavating foundation soil to the bottom surface of the roadbed, and excavating a temporary drainage structure to eliminate water seepage of the foundation;
2. drilling a hole on the bottom surface of the roadbed, lowering a reinforcement cage, and pouring a cast-in-place reinforced concrete pile;
3. leveling and excavating a foundation surface, binding a raft steel bar net, pouring a reinforced concrete raft and connecting the reinforced concrete raft and a reinforced concrete pile into a whole;
4. pouring a bearing plate on the upper end surface of the reinforced concrete raft plate within the influence range of the track load;
5. backfilling the water seepage soil outside the track load influence range on the two sides of the reinforced concrete raft and the bearing plate;
6. filling a foundation bed bottom layer filler layer and a foundation bed surface layer filler layer on the upper end face of the bearing plate to form a track roadbed;
7. and constructing a drainage ditch on the foundation on one side of the permeable soil far away from the roadbed, communicating the drainage ditch with the permeable soil, and discharging underground water below and on two sides of the reinforced concrete raft plate to enable the filler on the bearing plate to be in a dry state.
In a further step 3, the method for connecting the reinforced concrete rafts and the reinforced concrete piles comprises the following steps: and (3) binding a raft steel bar mesh, connecting a steel bar cage at the upper end of the reinforced concrete pile with the raft steel bar mesh, and pouring concrete to integrate the top and upper end steel bars of the reinforced concrete pile with the raft steel bar mesh.
In step 4, the method for casting the bearing plate includes: and pouring concrete without a steel bar framework on the upper end surfaces of the reinforced concrete rafts to form a bearing plate, so that the upper end surfaces of the bearing plate are higher than the highest water level of underground water by not less than 0.2 m.
Further in the pouring process of the bearing plate, a running water slope with a gradient of at least 2% and high in the middle and low in two sides is poured on the upper end face of the bearing plate.
In the step 4, the method for backfilling the water-permeable soil comprises the following steps: and backfilling infiltration soil at two sides of the reinforced concrete raft and the bearing plate, so that the upper end surface of the backfilled infiltration soil is flush with the lowest position of the upper end surface of the bearing plate.
In step 6, the method for filling the bottom filler layer of the foundation bed comprises the following steps: and a foundation bed bottom layer packing layer is filled on the upper end surface of the bearing plate, so that the upper end surface of the foundation bed bottom layer packing layer is provided with a slope with a high middle part and low two sides and at least 4 percent.
The further method for filling the surface layer filler layer of the foundation bed comprises the following steps: and filling the surface layer filler of the foundation bed according to the standard compaction of the surface layer of the foundation bed, wherein the shape of the roadbed is set according to the type of the high-speed railway track. In step 7, the method for communicating the drainage ditch with the water-permeable soil comprises the following steps: a plurality of water drainage holes are dug on the side wall of the drainage ditch facing the roadbed at intervals along the longitudinal direction of the roadbed, and the water drainage holes transversely extend into the water seepage soil along the roadbed and are not higher than the upper end surface of the bearing plate.
And further excavating a plurality of drainage holes on the side wall of the drainage ditch facing the roadbed at intervals of 1-2 m along the longitudinal direction of the roadbed.
Furthermore, drain holes are dug at the positions of more than 0.3m away from the bottom of the drainage ditch on the side wall of the drainage ditch facing the roadbed.
And further pouring a bearing plate with the thickness of 0.3-1.0 m on the upper end surface of the reinforced concrete raft.
The invention has the advantages that: 1. the roadbed structure fully integrates and utilizes the integral structures of the piles and the raft plates and is provided with the filler replacement and drainage height limiting structure, thereby successfully solving the problems of the upper arch risk of the expansive soil due to water saturation and the mud pumping disease of the foundation bed;
2. the roadbed structure avoids the risk of diseases, ensures the smooth and stable operation of a high-speed railway, has obvious social benefit and economic benefit, and saves more cost and reduces the construction difficulty compared with the overhead treatment of a pile and plate beam structure in a bridge form;
3. the roadbed structure disclosed by the invention is tested in rainy seasons, is stable and has a good use state.
Drawings
FIG. 1: the invention is a schematic diagram of a roadbed structure;
wherein: 1-reinforced concrete pile; 2-reinforced concrete raft; 3, a bearing plate; 4-bedding bottom layer packing layer; 5-a bed surface layer packing layer; 6, a drainage ditch; 7-water-permeable soil; 8-water drainage hole.
Detailed Description
The invention is described in further detail below with reference to the figures and the specific embodiments.
Aiming at Huang-Huai plain and south-Yang basin high-order areas crossed by Zheng Wan high railway lines, the roadbed is of a high underground water level expansive soil foundation structure, and in order to avoid the roadbed from being arched by the action of water absorption expansive force of expansive soil, a pile raft structure is poured below a roadbed packing layer.
As shown in fig. 1, the pile raft structure of the present embodiment includes a plurality of reinforced concrete piles 1 vertically supported below a roadbed packing layer, and a reinforced concrete raft 2 fixed to an upper end of the reinforced concrete piles 1. The reinforced concrete pile 1 is a cast-in-situ bored pile, and the diameter of the pile is 0.6-1.0 m. The reinforced concrete raft 2 is located under the roadbed packing layer, is of a plate-shaped structure with a smooth surface, and has a thickness of 0.5-0.8 m. Reinforced concrete raft 2 can completely cut off roadbed packing layer and below groundwater, avoids the hunch effect on the lower side soil body to the packing layer.
This embodiment has pour loading board 3 at reinforced concrete raft 2 up end, and as roadbed structure's the basis that bears, loading board 3 is no steel skeleton's plain concrete platelike structure, can effectively reduce construction and construction cost. The upper end surface of the bearing plate 3 is a slope structure with a middle height and two low sides and at least 2% of gradient. The upper end face of the bearing plate 3 is higher than the highest water level of underground water by not less than 0.2m, and the plate thickness is 0.3-1.0 m.
As shown in figure 1, the roadbed packing layer comprises a foundation bed bottom packing layer 4 filled on the upper end surface of the bearing plate 3 and a foundation bed surface packing layer 5 filled on the foundation bed bottom packing layer 4, and the height of the lower end surface of the foundation bed bottom packing layer 4 is not lower than that of the upper end surface of the water-permeable soil 7. The upper end surface of the bottom packing layer 4 of the foundation bed is a slope surface structure with a high middle part and low two sides and at least 4 percent of gradient.
In order to discharge the underground water below and at the two sides of the reinforced concrete raft 2, the roadbed packing layer is ensured to be always in a dry state, thereby reducing roadbed diseases. In the embodiment, drainage structures are arranged on two sides of the reinforced concrete raft 2. As shown in fig. 1, the roadbed comprises drainage ditches 6 dug at two sides of the roadbed and permeable soil 7 backfilled between the drainage ditches 6 and the reinforced concrete rafts 2. The infiltration soil 7 bit of this embodiment has the loose soil body structure in hole, can discharge the groundwater in reinforced concrete raft 2 below and both sides to escape canal 6 through smooth and easy pore water flow. The upper end face of the water-permeable soil 7 does not exceed the upper end face of the bearing plate 3.
The lateral wall of one side of escape canal 6 towards the road bed is seted up a plurality of outlet 8 that communicate infiltration soil 7, and adjacent outlet 8 is along road bed longitudinal separation 1 ~ 2m, and outlet 6 is communicated to 8 one end of outlet, and in the other end extended to infiltration soil 7 along the road bed transverse direction, at least 0.3m at the bottom of 8 lower extremes of outlet apart from 6 ditch of escape canal, the upper end was less than the up end of loading board 3.
The actual construction comprises the following steps: 1. excavating foundation soil to the bottom surface of a subgrade bed, and respectively excavating a temporary drainage ditch with the width of 0.2m and the depth of 0.3m with the two sides of the subgrade to remove foundation seepage;
2. drilling a hole in the bottom surface of the roadbed, lowering a reinforcement cage, and pouring a cast-in-place reinforced concrete pile 1;
3. leveling and excavating a foundation surface, binding a raft reinforcing mesh, binding and fixedly connecting a reinforcement cage at the upper end of the reinforced concrete pile 1 with the raft reinforcing mesh, and pouring concrete to integrate the raft reinforcing mesh with the top of the reinforced concrete pile 1 by 0.1-0.2 m and upper end reinforcing steel bars to form a reinforced concrete raft 2;
4. pouring a bearing plate 3 on the upper end surface of the reinforced concrete raft plate 1 within the influence range of the track load;
5. backfilling the permeable soil 7 at the two sides of the reinforced concrete raft 2 and the bearing plate 3 outside the influence range of the track load until the upper end surface of the permeable soil 7 is flush with the upper end surface of the bearing plate 3;
6. filling a foundation bed bottom layer filler layer 4 and a foundation bed surface layer filler layer 5 on the upper end face of the bearing plate 3 to form a track roadbed, filling the foundation bed bottom layer filler layer 4 according to a foundation bed bottom layer compaction standard, filling the foundation bed surface layer filler layer 5 according to a foundation bed surface layer compaction standard, and setting the shape of the roadbed surface according to a high-speed railway track type;
7. and excavating foundation pits of side ditches at two sides on the foundation at one side of the permeable soil 7 far away from the roadbed by adopting a cutting method, binding reinforcing steel bars of the side ditches, pouring side ditch concrete to form a drainage ditch 6, communicating the drainage ditch 6 with the permeable soil 7, and discharging underground water below and at two sides of the reinforced concrete raft plates 2 to enable the fillers on the bearing plates 3 to be in a dry state.
As shown in fig. 1, the longitudinal direction of the roadbed of the present embodiment refers to the direction of the vertical paper surface in fig. 1, the transverse direction of the roadbed refers to the up-down direction in fig. 1, and the vertical direction refers to the left-right direction in fig. 1.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A construction method of a high-groundwater-level low-filling shallow-digging expansive soil subgrade is characterized by comprising the following steps: the method comprises the following steps:
1) excavating foundation soil to the bottom surface of the roadbed bed, and excavating a temporary drainage structure to remove water seepage of the foundation;
2) drilling a hole on the bottom surface of the roadbed, lowering a reinforcement cage, and pouring a cast-in-place reinforced concrete pile (1);
3) leveling and excavating a foundation surface, binding a raft steel bar net, pouring a reinforced concrete raft (2) and connecting the reinforced concrete raft with the reinforced concrete pile (1) into a whole;
4) pouring a bearing plate (3) on the upper end surface of the reinforced concrete raft plate (1) within the influence range of the track load;
5) backfilling the water seepage soil (7) outside the track load influence range at the two sides of the reinforced concrete raft (2) and the bearing plate (3);
6) filling a foundation bed bottom layer filler layer (4) and a foundation bed surface layer filler layer (5) on the upper end surface of the bearing plate (3) to form a track roadbed;
7) and constructing a drainage ditch (6) on the foundation on one side of the water seepage soil (7) far away from the roadbed, communicating the drainage ditch (6) with the water seepage soil (7), and discharging underground water below and on two sides of the reinforced concrete raft (2) to enable the filler on the bearing plate (3) to be in a dry state.
2. The construction method of the high-groundwater-level low-filling shallow-digging expansive soil subgrade as recited in claim 1, characterized in that: in the step 3), the method for connecting the reinforced concrete raft (2) and the reinforced concrete piles (1) comprises the following steps: and (3) binding a raft steel bar mesh, connecting the top and upper end steel bar cages of the reinforced concrete piles (1) with the raft steel bar mesh, and pouring concrete to integrate the upper end steel bars of the reinforced concrete piles (1) with the raft steel bar mesh.
3. The construction method of the high-groundwater-level low-filling shallow-digging expansive soil subgrade as recited in claim 1, characterized in that: in the step 4), the method for pouring the bearing plate (3) comprises the following steps: and pouring concrete without a steel bar framework on the upper end surface of the reinforced concrete raft (2) to form a bearing plate (3), so that the upper end surface of the bearing plate (3) is higher than the highest water level of underground water by not less than 0.2 m.
4. The method for constructing the expansive soil subgrade with the high underground water level and the low filling and shallow digging as claimed in claim 3, wherein the method comprises the following steps: in the pouring process of the bearing plate (3), a running water slope with a gradient of at least 2% and high in the middle and low in two sides is poured on the upper end face of the bearing plate (3).
5. The construction method of the high-groundwater-level low-filling shallow-digging expansive soil subgrade as recited in claim 1, characterized in that: in the step 4), the method for backfilling the water-permeable soil (7) comprises the following steps: and (3) backfilling the water-permeable soil (7) at two sides of the reinforced concrete raft (2) and the bearing plate (3), so that the upper end surface of the backfilled water-permeable soil (7) is flush with the lowest part of the upper end surface of the bearing plate (3).
6. The construction method of the high-groundwater-level low-filling shallow-digging expansive soil subgrade as recited in claim 1, characterized in that: in the step 6), the method for filling the bottom filler layer (4) of the foundation bed comprises the following steps: and a foundation bed bottom packing layer (4) is filled on the upper end surface of the bearing plate (3), so that the upper end surface of the foundation bed bottom packing layer (4) forms a slope with a high middle part and low two sides and at least 4 percent of slope.
7. The construction method of the high-groundwater-level low-filling shallow-digging expansive soil subgrade as recited in claim 1, characterized in that: in the step 7), the method for communicating the drainage ditch (6) with the water seepage soil (7) comprises the following steps: a plurality of water drainage holes (8) are dug on the side wall of the drainage ditch (6) facing the roadbed at intervals along the longitudinal direction of the roadbed, the water drainage holes (8) transversely extend into the water-permeable soil (7) along the roadbed, and the height of the water drainage holes is not higher than the upper end surface of the bearing plate (3).
8. The method for constructing the expansive soil subgrade with the high underground water level and the low filling and shallow digging as claimed in claim 7, wherein the method comprises the following steps: a plurality of water drainage holes (8) are dug in the side wall, facing the roadbed, of the drainage ditch (6), and adjacent water drainage holes (8) are longitudinally spaced by 1-2 m along the roadbed.
9. The method for constructing the expansive soil subgrade with the high underground water level and the low filling and shallow digging as claimed in claim 7, wherein the method comprises the following steps: and drainage holes (8) are dug at the positions, which are more than 0.3m away from the bottom of the trench, of the side walls of the drainage trenches (6) facing the roadbed.
10. The method for constructing the high-groundwater-level low-fill shallow-excavation expansive soil subgrade as claimed in claim 1 or 4, wherein: and pouring a bearing plate (3) with the thickness of 0.3-1.0 m on the upper end surface of the reinforced concrete raft (2).
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| CN110396882B (en) * | 2019-07-05 | 2024-03-26 | 江苏科技大学 | Fluidized backfill soil sliding film perforating device and method for perforating by adopting device |
| CN110565449A (en) * | 2019-09-26 | 2019-12-13 | 中铁二院工程集团有限责任公司 | Anti-uplift and anti-separation type pile plate structure of high-speed railway |
| CN111395061B (en) * | 2020-03-24 | 2021-11-09 | 中铁二院工程集团有限责任公司 | Light roadbed structure of underpass operation bridge, design and construction method |
| CN114809065A (en) * | 2022-04-13 | 2022-07-29 | 中国能源建设集团江苏省电力设计院有限公司 | Power transmission tower foundation structure and construction method |
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| DE4407747C2 (en) * | 1994-03-08 | 1996-04-04 | Porr Technobau Ag | Track for rail-guided traffic and method for upgrading tracks |
| BG61850B2 (en) * | 1995-11-09 | 1998-07-31 | Светомир АТАНАСОВ | Railway road |
| CN202577167U (en) * | 2012-03-07 | 2012-12-05 | 中铁第四勘察设计院集团有限公司 | High groundwater level railway foundation bed and drainage structure |
| CN208072088U (en) * | 2017-12-23 | 2018-11-09 | 中铁二院工程集团有限责任公司 | Strong water abundant ground railway expensive soil cutting bedding construction |
| CN208072090U (en) * | 2018-02-07 | 2018-11-09 | 中铁二院(成都)建设发展有限责任公司 | A kind of lower soil property cutting high-speed railway ruggedized construction of bearing capacity |
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