CN111502748B - Construction method for backfilling foundation of railway crossing giant karst cave - Google Patents
Construction method for backfilling foundation of railway crossing giant karst cave Download PDFInfo
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- CN111502748B CN111502748B CN202010321100.XA CN202010321100A CN111502748B CN 111502748 B CN111502748 B CN 111502748B CN 202010321100 A CN202010321100 A CN 202010321100A CN 111502748 B CN111502748 B CN 111502748B
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- 238000010276 construction Methods 0.000 title claims abstract description 149
- 238000005096 rolling process Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 238000011144 upstream manufacturing Methods 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 3
- 239000002893 slag Substances 0.000 description 8
- 239000002699 waste material Substances 0.000 description 8
- 230000000903 blocking effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000004575 stone Substances 0.000 description 5
- 230000002411 adverse Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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Abstract
The invention discloses a construction method for backfilling a foundation of a railway crossing huge karst cave. The multi-channel graded backfilling and layered tamping mode is adopted for the karst cave hall, the compactness of a backfilled body is improved, the later settlement of the foundation is effectively controlled, the problems that the existing integral backfilling mode is difficult to densely backfill the body and effectively control the settlement of the foundation are solved, the construction risk is reduced, and the railway operation safety is ensured.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a construction method for backfilling a foundation of a railway crossing giant karst cave.
Background
China is one of the countries with the widest distribution area of the karst in the world, and along with the large-scale construction of railways, a large amount of railway engineering which passes through various karsts inevitably appears.
At present, construction treatment schemes such as backfilling are generally adopted when a railway passes through a karst cave, and during construction, the backfilling body is poured into the bottom of the karst cave from a position where the karst cave is exposed from a tunnel until the backfilling reaches the designed elevation of a filling surface of the tunnel. However, the method is only suitable for small dry caverns developed at the bottom of the tunnel, and for large and karst cave halls with large cavities and poor stability of cavern walls, the backfilling by directly dumping the backfilling body from the upper part is infeasible, particularly for large-scale karst caves with large height and span, the construction method is adopted, the dumping height is hundreds of meters, and on one hand, the cave walls can collapse due to severe vibration caused by dumping of the backfilling body; on the other hand, the compactness of the backfill body cannot be guaranteed by direct dumping, the later settlement of the foundation cannot be effectively controlled, and the safety of construction and operation cannot be guaranteed.
Disclosure of Invention
The invention aims to: for a karst cave hall with a developed tunnel bottom, the cavity height and the span are large, when a filling scheme is implemented, if the karst cave opening is directly filled downwards from a tunnel, the pouring height is extremely high, and on one hand, the karst cave wall can be collapsed due to severe vibration caused by pouring of a backfill body; on the other hand, the compactness of the backfill body cannot be guaranteed by direct dumping, so that the later settlement of the structure cannot be effectively controlled, and the safety of construction and operation cannot be guaranteed.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method for backfilling the foundation of a huge karst cave penetrated by a railway is characterized in that a plurality of channels communicated with the cave wall of a karst cave hall are constructed from bottom to top, and the karst cave hall is backfilled and tamped layer by layer through the channels.
Preferably, the backfill is performed from low to high, and from the hole wall to the middle.
Further preferably, each passage opening corresponds to a construction platform.
Preferably, the construction platform is used for constructing a construction access road downwards, the slope foot of the construction access road is used for backfilling upwards in a layered mode, and the backfilling layer is leveled and rolled by an operation machine at intervals of 3-5 m in height, so that the compactness of the backfilling body is guaranteed.
Further preferably, each channel is correspondingly used as a backfill platform.
Further preferably, when the channels are backfilled to the respective backfilling platforms, the channels are plugged by using plugging walls.
Further preferably, when backfilling is carried out until the excavation of the tunnel reveals that the karst cave is located on the upper step, a reinforcing structure is applied to the top plate of the karst cave.
Further preferably, the reinforcing structure comprises an anchor net-jet protection.
Preferably, when a river exists in the karst cave hall, a drainage tunnel is constructed to drain the river, so that water flow bypasses the karst cave hall.
Further preferably, the construction method for backfilling the foundation of the railway crossing karst cave hall comprises the following steps:
firstly, a roundabout drainage tunnel is arranged at the slope toe of a karst cave hall along the water flow direction of a river, the river in the range of the karst cave hall is diverted, and the water at the upstream of the river is drained to the downstream;
constructing a first channel on one side of a slope toe of a karst cave hall, wherein the first channel is communicated with a cave wall, constructing a first construction platform at the intersection of the first channel and the karst cave hall, the first construction platform is flush with the bottom of the first channel, constructing a first construction sidewalk at the first construction platform to the bottom of the karst cave hall, segmenting from the upstream to the downstream of the underground river through the first construction sidewalk, backfilling in layers, and leveling and rolling a backfill layer by adopting an operation machine at intervals of 3-5 m; after backfilling to the first construction platform, arranging a first roundabout access upwards from the first construction platform by a slope for backfilling, and backfilling to the first backfilling platform; after backfilling is finished, arranging a first plugging wall to plug the intersection of the first channel and the karst cave hall;
constructing a second channel above the first channel, wherein the second channel is communicated with a tunnel wall, constructing a second construction platform at the intersection of the second channel and a karst cave hall, the second construction platform is flush with the bottom of the second channel, constructing a second construction access to the first backfill platform at the second construction platform, backfilling the backfill layer upwards by slope feet in layers through the second construction access, and leveling and rolling the backfill layer by adopting an operation machine at intervals of 3-5 m height; after backfilling to the second construction platform, arranging a second roundabout access upwards from the second construction platform by a slope for backfilling, and backfilling to the second backfilling platform; after backfilling is finished, arranging a second plugging wall to plug the intersection of the second channel and the karst cave hall;
constructing a third channel above the second channel, wherein the third channel is communicated with a cave wall, a third construction platform is constructed at the intersection of the third channel and a karst cave hall, the third construction platform is flush with the bottom of the third channel, a third construction access is constructed at the third construction platform to the second backfill platform, the third construction access is backfilled upwards in layers by slope feet, and the backfill layer is leveled and rolled by an operation machine at the interval of 3-5 m; after backfilling to the third construction platform, arranging a third roundabout access upwards from the third construction platform by a slope for backfilling, and backfilling to the third backfilling platform; after the backfilling is finished, arranging a third plugging wall to plug the intersection of the third channel and the karst cave hall;
constructing a fourth channel above the third channel, wherein the fourth channel is communicated with a tunnel wall, constructing a fourth construction platform at the intersection of the fourth channel and a karst cave hall, the fourth construction platform is flush with the bottom of the fourth channel, constructing a fourth construction sidewalk to the third backfill platform at the fourth construction platform, backfilling the backfill layer upwards in layers by slope feet through the fourth construction sidewalk, and leveling and rolling the backfill layer by using an operating machine at intervals of 3-5 m; after backfilling to the fourth construction platform, arranging a fourth roundabout access upwards from the fourth construction platform by a slope for backfilling, and backfilling to the fourth backfilling platform; after backfilling is finished, a fourth plugging wall is arranged to plug the intersection of the fourth channel and the karst cave hall;
sixthly, enabling an upper step at the position of the karst cave disclosed by tunnel excavation to enter a karst cave hall, backfilling the intersection of the upper step at the position of the karst cave disclosed by tunnel excavation and the karst cave hall to the elevation of the upper step of the tunnel to form a fifth construction platform, constructing a fifth construction sidewalk to a fourth backfilling platform at the fifth construction platform, backfilling upwards in layers from a slope foot through the fifth construction sidewalk, and leveling and rolling the backfilling layer by adopting an operating machine at intervals of 3-5 m; after backfilling to the fifth construction platform, arranging a fifth roundabout access backfilling residual part upwards in a slope from the fifth construction platform;
and seventhly, applying an anchor net spraying and reinforcing structure to the top plate of the karst cave which is not backfilled by using the fifth construction platform.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the construction method for foundation backfill of the railway crossing huge karst cave, a multi-channel graded backfill and layered tamping mode is adopted for a karst cave hall, the compactness of a backfill body is improved, the later settlement of a foundation is effectively controlled, the problems that the backfill body is difficult to compact and the settlement of the foundation is difficult to effectively control in the conventional integral backfill mode are solved, the construction risk is reduced, and the railway operation safety is ensured;
2. the construction method for backfilling the foundation of the railway passing through the huge karst cave can enable the railway to smoothly pass through a karst cave hall, breaks through the limitations of avoidance, route changing and the like when the traditional tunnel construction meets the karst cave hall, and improves the freedom degree of railway route selection;
3. the construction method for backfilling the foundation of the railway crossing the giant karst cave can reasonably utilize the tunnel waste slag, reduce the occupied area of the waste slag, solve the problem of slag waste in a difficult mountain area, avoid the environmental protection problem caused by the tunnel waste slag and fulfill the requirement of green and environment-friendly construction; meanwhile, the problems of construction period delay, economic loss, adverse social influence and the like caused by line change can be avoided, and the method has good economic and social benefits and wide popularization and application prospects.
Drawings
FIG. 1 is a schematic diagram showing the structure of step (i) in the embodiment;
FIG. 2 is a schematic structural diagram of step two in the embodiment;
FIG. 3 is a schematic structural diagram of step three in the embodiment;
FIG. 4 is a schematic structural view of step (iv) in the example;
FIG. 5 is a schematic structural view of the fifth step in the example;
FIG. 6 is a schematic structural diagram of step sixty in the example;
FIG. 7 is a schematic structural diagram of step (c) in the example;
fig. 8 is a schematic diagram of the diversion of the underground river in the example.
Icon: 1-first passage, 2-second passage, 3-third passage, 4-fourth passage, 5-tunnel excavation reveals the bench at the karst cave, 6-sluicehole, 7-underground river, 8-karst cave roof, 9-reinforced structure, 10-first blocking wall, 11-second blocking wall, 12-third blocking wall, 13-fourth blocking wall, 100-karst cave, 101-first construction platform, 102-second construction platform, 103-third construction platform, 104-fourth construction platform, 105-fifth construction platform, 111-first backfill platform, 112-second backfill platform, 113-third backfill platform, 114-fourth backfill platform, 121-first construction convenience way, 122-second construction convenience way, 123-third construction convenience way, 124-a fourth construction lane, 125-a fifth construction lane, 201-a first roundabout lane, 202-a second roundabout lane, 203-a third roundabout lane, 204-a fourth roundabout lane.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Examples
As shown in FIGS. 1 to 8, the construction method for backfilling the foundation of the railway crossing the giant cavern comprises the following steps:
firstly, as shown in fig. 1 and 8, a roundabout drainage tunnel 6 is arranged at the position, 50m away from the right tunnel wall along the water flow direction of a underground river 7, of the slope toe of a karst cave hall 100, the underground river 7 in the range of the karst cave hall 100 is diverted, and water at the upstream of the underground river 7 is drained to the downstream;
constructing a first channel 1 on one side of a slope toe of a karst cave hall 100, wherein the first channel 1 is communicated with a cave wall, backfilling stone blocks at the intersection of the first channel 1 and the karst cave hall 100 to construct a first construction platform 101 with the thickness of 10m multiplied by 10m, wherein the first construction platform 101 is flush with the bottom of the first channel 1, constructing a first construction pavement 121 from the upstream of a river 7 to the downstream of the karst cave hall 100 at the first construction platform 101 by adopting cave ballast, backfilling the pavement in sections and layers from the upstream to the downstream of the river 7 through the first construction pavement 121, and flattening and rolling a backfill layer by adopting an operation machine at the interval of 3m-5m height; after backfilling to the first construction platform 101, a first roundabout access 201 is arranged upwards from the first construction platform 101 at a gradient of 10% for backfilling, and backfilling is carried out to a first backfilling platform 111; after backfilling is finished, arranging a first blocking wall 10 by adopting C20 concrete to block the intersection of the first passage 1 and the karst cave hall 100;
constructing a second channel 2 above the first channel 1, wherein the second channel 2 is communicated with the tunnel wall, backfilling stone blocks thrown at the intersection of the second channel 2 and the karst cave hall 100 to construct a second construction platform 102 with the thickness of 10m multiplied by 10m, wherein the second construction platform 102 is flush with the bottom of the second channel 2, constructing a second construction pavement 122 to the first backfill platform 111 by adopting the tunnel ballast at the second construction platform 102, backfilling upwards layer by slope legs through the second construction pavement 122, and flattening and rolling the backfill layer by adopting an operating machine at the interval of 3m-5m height; after backfilling to the second construction platform 102, a second roundabout access 202 is arranged upwards from the second construction platform 102 at a slope of 10% for backfilling, and backfilling is carried out to a second backfilling platform 112; after the backfilling is finished, arranging a second blocking wall 11 by adopting C20 concrete to block the intersection of the second passage 2 and the karst cave hall 100;
fourthly, as shown in fig. 4, constructing a third channel 3 above the second channel 2, wherein the third channel 3 is communicated with the cave wall, backfilling stone blocks thrown at the intersection of the third channel 3 and the karst cave hall 100 to construct a third construction platform 103 with the thickness of 10m multiplied by 10m, wherein the third construction platform 103 is flush with the bottom of the third channel 3, constructing a third construction pavement 123 to the second backfilling platform 112 by adopting cave ballast at the third construction platform 103, backfilling upwards in layers by slope feet through the third construction pavement 123, and flattening and rolling the backfilling layer by adopting an operation machine at the height of 3m-5 m; after backfilling to the third construction platform 103, a third roundabout access 203 is arranged upwards at a gradient of 10% from the third construction platform 103 for backfilling, and backfilling is carried out to a third backfilling platform 113; after the backfilling is finished, a third plugging wall 12 is arranged by adopting C20 concrete to plug the intersection of the third channel 3 and the karst cave hall 100;
fifthly, as shown in fig. 5, constructing a fourth channel 4 above the opposite side of the third channel 3, wherein the fourth channel 4 is communicated with the tunnel wall, backfilling stone blocks thrown and filled at the intersection of the fourth channel 4 and the karst cave hall 100 to construct a fourth construction platform 104 with the thickness of 10m multiplied by 10m, wherein the fourth construction platform 104 is flush with the bottom of the fourth channel 4, constructing a fourth construction pavement 124 to the third backfilling platform 113 by using cave ballast at the fourth construction platform 104, backfilling upwards in layers by slope legs through the fourth construction pavement 124, and leveling and rolling the backfilled layer by using an operating machine at the interval of 3m-5m height; after backfilling to the fourth construction platform 104, a fourth roundabout access 204 is arranged upwards from the fourth construction platform 104 at a gradient of 10% for backfilling, and backfilling is carried out to a fourth backfilling platform 114; after the backfilling is finished, a fourth blocking wall 13 is arranged by adopting C20 concrete to block the intersection of the fourth channel 4 and the karst cave hall 100;
sixthly, as shown in fig. 6, an upper step 5 at the position of the karst cave is opened by tunnel excavation and enters a karst cave hall 100, filling block stones are thrown at the intersection of the upper step 5 at the position of the karst cave and the karst cave hall 100 and backfilled to the elevation of the upper step of the tunnel, a fifth construction platform 105 with the height of 10m multiplied by 10m is formed, tunnel ballast is applied to the fifth construction platform 105 to form a fifth construction sidewalk 125 to a fourth backfilling platform 114, the fifth construction sidewalk 125 is backfilled upwards in a layered mode through slope feet, and the backfilling layer is leveled and rolled by an operation machine at the interval of 3m-5m height; after backfilling to the fifth construction platform 105, upwards arranging a fifth roundabout access backfilling residual part at a gradient of 10% from the fifth construction platform 105 to the outside;
and seventhly, as shown in fig. 7, in order to ensure the construction safety, the fifth construction platform 105 is used for applying an anchor net spraying reinforcing structure 9 to the top plate 8 of the unfilled karst cave.
By applying the construction method for backfilling the foundation of the karst cave hall 100 penetrated by the railway, the multi-channel graded backfilling and layered tamping modes are adopted for the karst cave hall 100, so that the compactness of a backfilled body is improved, the later settlement of the foundation is effectively controlled, the problems that the backfilled body is difficult to be compacted and the settlement of the foundation is difficult to be effectively controlled in the conventional integral backfilling mode are solved, the construction risk is reduced, and the safety of railway operation is ensured; the railway can smoothly pass through the karst cave hall 100 hall, the limitations of avoidance, route change and the like when the traditional tunnel construction meets the karst cave hall 100 are broken through, and the freedom degree of railway route selection is improved; the tunnel waste slag can be reasonably utilized, the waste slag occupation is reduced, the problem of slag waste in a hard mountainous area is solved, the environmental protection problem caused by the tunnel waste slag is avoided, and the requirement of green and environment-friendly construction is met; meanwhile, the problems of construction period delay, economic loss, adverse social influence and the like caused by line change can be avoided, and the method has good economic and social benefits and wide popularization and application prospects.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. A construction method for backfilling a foundation of a giant karst cave penetrated by a railway is characterized in that a plurality of channels communicated with the wall of a karst cave hall (100) are constructed from bottom to top, and the karst cave hall (100) is backfilled and tamped layer by layer through the channels;
when a cave (7) exists in the karst cave hall (100), a drainage tunnel (6) is constructed to drain the river (7) so that water flow bypasses the karst cave hall (100);
the method comprises the following steps: firstly, a roundabout drainage tunnel (6) is arranged at the slope toe of a karst cave hall (100) along the water flow direction of a river (7), the river (7) in the range of the karst cave hall (100) is diverted, and the water at the upstream of the river (7) is drained to the downstream; constructing a first channel (1) on one side of a toe of a karst cave hall (100), wherein the first channel (1) is communicated with a cave wall, constructing a first construction platform (101) at the intersection of the first channel (1) and the karst cave hall (100), wherein the first construction platform (101) is flush with the bottom of the first channel (1), constructing a first construction pavement (121) to the bottom of the karst cave hall (100) at the first construction platform (101), backfilling the backfill layer by layer from the upstream to the downstream of the underground river (7) through the first construction pavement (121), and leveling and rolling the backfill layer by adopting an operation machine at the interval of 3-5 m height; after backfilling to the first construction platform (101), arranging a first roundabout access (201) upwards from the first construction platform (101) in a slope for backfilling, and backfilling to a first backfilling platform (111); after backfilling is finished, arranging a first plugging wall (10) to plug the intersection of the first channel (1) and the karst cave hall (100); constructing a second channel (2) above the first channel (1), wherein the second channel (2) is communicated with a tunnel wall, constructing a second construction platform (102) at the intersection of the second channel (2) and the karst cave hall (100), wherein the second construction platform (102) is parallel and level to the bottom of the second channel (2), constructing a second construction pavement (122) to the first backfill platform (111) at the second construction platform (102), backfilling upwards layer by layer through slope legs of the second construction pavement (122), and leveling and rolling the backfill layer by adopting an operation machine at intervals of 3-5 m height; after backfilling to the second construction platform (102), arranging a second roundabout access (202) upwards in a slope from the second construction platform (102) for backfilling, and backfilling to a second backfilling platform (112); after backfilling is finished, arranging a second plugging wall (11) to plug the intersection of the second channel (2) and the karst cave hall (100); constructing a third channel (3) above the second channel (2), wherein the third channel (3) is communicated with a tunnel wall, constructing a third construction platform (103) at the intersection of the third channel (3) and the karst cave hall (100), wherein the third construction platform (103) is flush with the bottom of the third channel (3), constructing a third construction temporary road (123) to the second backfill platform (112) at the third construction platform (103), backfilling upwards in layers by slope legs through the third construction temporary road (123), and leveling and rolling the backfill layer by adopting an operation machine at the height of 3m-5 m; after backfilling to the third construction platform (103), a third roundabout access (203) is arranged upwards in a slope from the third construction platform (103) for backfilling, and backfilling to a third backfilling platform (113); after backfilling is finished, arranging a third plugging wall (12) to plug the intersection of the third channel (3) and the karst cave hall (100); constructing a fourth channel (4) above the third channel (3), wherein the fourth channel (4) is communicated with a tunnel wall, constructing a fourth construction platform (104) at the intersection of the fourth channel (4) and the karst cave hall (100), wherein the fourth construction platform (104) is flush with the bottom of the fourth channel (4), constructing a fourth construction temporary road (124) to the third backfill platform (113) at the fourth construction platform (104), backfilling upwards in layers by slope legs through the fourth construction temporary road (124), and leveling and rolling the backfill layer by adopting an operating machine at intervals of 3-5 m height; after backfilling to the fourth construction platform (104), a fourth roundabout access (204) is arranged upwards in a slope from the fourth construction platform (104) for backfilling, and backfilling to a fourth backfilling platform (114); after backfilling is finished, a fourth plugging wall (13) is arranged to plug the intersection of the fourth channel (4) and the karst cave hall (100); sixthly, enabling an upper step (5) at the position where the karst cave is revealed to enter a karst cave hall (100) during tunnel excavation, backfilling the intersection of the upper step (5) at the position where the karst cave is revealed and the karst cave hall (100) to the elevation of the upper step of the tunnel to form a fifth construction platform (105), constructing a fifth construction sidewalk (125) to a fourth backfilling platform (114) at the position of the fifth construction platform (105), backfilling the fifth construction sidewalk (125) in a layered mode upwards from a toe, and leveling and rolling the backfilling layer by adopting an operation machine at the height of 3-5 m intervals; after backfilling to the fifth construction platform (105), arranging a fifth roundabout access backfilling residual part upwards in a slope from the fifth construction platform (105); and seventhly, applying an anchor net spraying and reinforcing structure (9) on the top plate (8) of the unfilled cave by using the fifth construction platform (105).
2. The construction method according to claim 1, wherein the backfilling is performed from the hole wall to the middle.
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| CN112065444A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam construction method based on karst cave underground river environment tunnel construction |
| CN112065437A (en) * | 2020-08-19 | 2020-12-11 | 中铁五局集团有限公司 | Continuous beam support pre-pressing construction method based on karst cave underground river environment tunnel construction |
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