CN108867225B - Method for processing water falling hole in karst landform road subgrade range - Google Patents
Method for processing water falling hole in karst landform road subgrade range Download PDFInfo
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- CN108867225B CN108867225B CN201810736419.1A CN201810736419A CN108867225B CN 108867225 B CN108867225 B CN 108867225B CN 201810736419 A CN201810736419 A CN 201810736419A CN 108867225 B CN108867225 B CN 108867225B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/18—Making embankments, e.g. dikes, dams
Abstract
A method for processing a water falling hole in the karst landform road subgrade range comprises the following steps: (1) water pumping and sewage discharging are carried out, so that the water level of the water falling hole is effectively reduced; (2) uniformly throwing the flaky stones along the water falling hole, and ramming and pressing the flaky stones into the sludge; (3) after the rubble is thrown to the designed elevation, concrete is poured until the rubble is completely covered, and the rubble is vibrated and compacted; (4) pouring the stone slab concrete to the designed elevation of the bottom of the cover plate; (5) after the rubble concrete layer is consolidated, leveling the field, applying a reinforced concrete rib-shaped cover plate, and arranging a leveling layer between the cover plate and the rubble concrete layer; (6) removing humus from the side slope, and ensuring that the side slopes on the two sides meet the design requirements; (7) and carrying out layered rolling and backfilling on the roadbed to a designed elevation. The invention can effectively treat the water falling hole in the roadbed range of the karst landform area, and can effectively solve the problems of soaking and erosion of underground water to roadbed soil, softening and loss of the roadbed and the like.
Description
Technical Field
The invention relates to the technical field of road subgrade construction, in particular to a method for processing a water falling hole in a road subgrade range in a karst landform area.
Background
In road construction, water becomes one of important factors influencing the stability of a roadbed, particularly in a karst landform area, a submarine often develops under a water falling cave, an underground river is communicated with underground water and a ground surface river, and in rainy days or flood seasons, the underground water easily gushes out from the water falling cave mouth to soak the roadbed and erode roadbed soil, so that the roadbed soil is softened and lost, the roadbed collapses and the stability of the roadbed is seriously influenced. Therefore, aiming at different types of water falling holes, corresponding treatment measures are taken to eliminate the influence of water on the roadbed, and the key for ensuring the stability of the roadbed in the karst landform area is provided.
The water falling cave is one of karst landforms, is a cave developed along the vertical direction, is vertically or steeply bent and bent, has the width of several centimeters to 10 meters, and has the depth of several hundred meters. The vertical shaft is called that surface water flows into the vertical shaft through a water falling hole and no water flows into the vertical shaft. The water falling hole can be divided into: gap-shaped water falling holes, well-shaped water falling holes and vertical well-shaped water falling holes. In the actual engineering, the damage degree to the roadbed can be divided into: no water falling hole and water falling hole.
In order to smoothly complete road engineering, people can treat the water falling hole. The general design can be summarized as follows: filling, blocking, reserving and discharging. Filling: and backfilling the hole with rubbles or blocks. Blocking: and plugging the hole by using grouted rubbles or reinforced concrete. And (3) reserving: and building a sealing cover vertical shaft at the hole, and reserving the hole to facilitate the discharge of underground water. And (4) row: through the connection of the culvert and the cover shaft, water is drained away from the culvert.
In the existing road construction engineering, a grouting method is also adopted to treat the water falling cave. The construction method comprises the following steps: firstly pumping and draining accumulated water in the water falling hole, adopting a method of injecting pure cement paste, injecting the paste into the water falling hole by applying certain pressure, allowing the paste to flow and diffuse along the cracks, filling the gaps and joints of the whole water falling hole with the cement paste, preventing the occurrence of the effects of elutriation and underetching, and leading soil particles to lose original power, thereby playing the roles of filling and reinforcing the stratum. The method often has the problems of slurry leakage, slurry stringing, large amount of slurry leakage and the like on the ground surface, increases the treatment cost and influences the construction progress. The influence of the water falling hole in the karst landform area on the roadbed has particularity, and if the treatment method is improper, hidden troubles are left for the stability of the roadbed. The publications also report some techniques concerning the treatment of the overboard of the roadbed, such as:
1. chinese patent: a karst depression overboard hole protection device, application No.: 201510892755.1, Applicant: guizhou Zhengye engineering technology investment company, address: 550005 Baoshan Nanlu, Guiyang city, Guizhou province 564 th abstract: the invention discloses a karst depression falling water hole protection device which comprises a maintenance body (1) arranged on the periphery of a falling water hole (4), wherein a drainage ditch (2) is arranged below the maintenance body (1), the drainage ditch (2) is connected with the falling water hole (4), and a top cover plate (3) is arranged above the drainage ditch (2). The maintenance body (1) is a rotating body, and the central axis is the center of the water falling hole (4). The cross section of the maintenance body (1) is in the shape of an isosceles trapezoid with a narrow upper bottom and a wide lower bottom. The invention effectively solves the engineering problem when the drainage is not smooth due to the fact that a large amount of earth and rock waste residues roll down to the center of the depression and block of a depression water falling hole is caused when a karst depression engineering is excavated.
2. Chinese patent: a high speed railway subgrade structure through karst overboard caves, application No.: 201720672286.7, Applicant: project group, llc, of the medium and iron schools, address: 610031 Sichuan province city Tongjin road No. 3, abstract: the invention discloses a high-speed railway roadbed structure through a karst water falling hole, which can effectively discharge surface water, does not block the water falling hole, meets the requirement of a high-speed railway roadbed and is convenient to construct. It includes: the jet grouting pile is arranged in the soil foundation at the periphery of the water falling hole to form an occlusion curtain enclosing structure; the reinforcing pile is arranged in the soil foundation outside the range of the water falling hole; and the drainage frame is arranged at the top of the foundation within the influence range of the water falling hole, and the roadbed filling body is filled at the top of the drainage frame. The invention effectively solves the problem that the drainage of the water falling hole and the roadbed filling meet the requirements of the high-speed railway.
3. The Chinese journal: research on karst subgrade treatment technology, Shanxi architecture, No. 35, No. 19 of No. 7 month in 2009, abstract: starting from the current situation of domestic and foreign research on karst subgrade diseases and treatment, the research on the exploration and treatment technology of the karst subgrade is carried out, and the reinforcement technology of shallow and deep karst subgrades and the treatment measure of a water falling cave are provided in order to reduce or avoid the potential safety hazard and the economic loss of the subgrade quality caused by karst and karst water.
Disclosure of Invention
The invention aims to provide a method for treating a water falling hole in a road subgrade range in a karst landform area, aiming at overcoming the defects of the prior art, and effectively solving the problems of soaking and washout of underground water on subgrade soil, softening and loss of subgrade and the like.
The invention is realized by adopting the following technical scheme:
a method for processing a water falling hole in a karst landform road subgrade range comprises the steps of backfilling rubbles and covering a concrete cover plate, draining the ground before construction, keeping a foundation pit dry, and softening the foundation without water accumulation, wherein the steps are as follows:
(1) water pumping and sewage discharging are carried out, so that the water level of the water falling hole is effectively reduced; if the drainage of the underground river is not dry in the water pumping site, the enclosing cofferdam is needed, and then the water pumping and the sewage discharging are carried out, which is beneficial to throwing the rubble.
(2) Uniformly throwing the flaky stones along the water falling hole, and ramming and pressing the flaky stones into the sludge; preferably, the slate is thrown evenly along the water falling hole by an excavator and is compacted into the sludge by a machine bucket.
(3) And after the rubble is thrown to the designed elevation, pouring concrete until the rubble is completely covered, and vibrating and compacting.
(4) And then pouring the stone slab concrete to the designed elevation of the bottom of the cover plate.
(5) And after the rubble concrete layer is solidified, leveling the field, applying a reinforced concrete rib-shaped cover plate, and arranging a leveling layer between the cover plate and the rubble concrete layer.
(6) The humus soil of the side slope is removed, and the side slopes on the two sides need to meet the design requirements.
(7) And carrying out layered rolling and backfilling on the roadbed to a designed elevation.
The particle size of the flaked stone in the step (2) is not less than 70 cm.
The pouring concrete in the step (3) adopts C30 concrete.
The rubble concrete in the step (4) adopts C30 concrete, and the mixing amount of the rubbles is 30%. The particle size of the flaky stone is 60-80 cm.
The sideline of the reinforced concrete rib-type cover plate in the step (5) is required to be 5m larger than the sideline of the water surface, and the leveling layer is made of C15 concrete and is 10cm thick.
And (3) the ribbed columns of the reinforced concrete ribbed cover plate in the step (5) face one side of the roadbed of the road, and the space between the ribbed plates is 5000 mm.
The reinforced concrete rib-type cover plate in the step (5) adopts C10-C28 steel bars; wherein the bottom plate adopts double-layer bidirectional C16 steel bars, and the distance is 18-22 cm; the rib plates adopt C10 double stirrups and C16 tie bars, and the space is respectively 220mm and 420 mm; 8-12C 16 longitudinal steel bars are arranged on two sides of the ribbed slab; 3-5C 28 single-layer main ribs are arranged on the top surfaces of the rib plates; 26-30C 28 double-layer main ribs are arranged at the joint of the bottom plate and the rib plate. Preferably, the reinforced concrete rib-type cover plate in the step (5) adopts C10-C28 steel bars; wherein the bottom plate adopts double-layer bidirectional C16 steel bars, and the distance is 20 cm; the rib plates adopt C10 double stirrups and C16 tie bars, and the space is 200mm and 400mm respectively; 10C 16 longitudinal steel bars are arranged on two sides of the rib plate; 4C 28 single-layer main ribs are arranged on the top surfaces of the rib plates; 28C 28 double-layer main ribs are arranged at the joint of the bottom plate and the rib plate.
The continuous thickness after the layering and rolling in the step (7) is not less than 50 cm.
Compared with the prior art, the invention has the prominent substantive characteristics and remarkable progress that:
1. the construction method is simple, convenient for construction organization and capable of ensuring construction quality.
2. The invention has short construction period, less occupied field, easily purchased construction raw materials and lower treatment cost.
2. The invention can effectively protect the underground water system without damaging the underground water system connected with the water falling hole, and has no great influence on the surrounding environment.
3. According to the invention, the slates are uniformly thrown along the falling water hole, so that the arched stress model can be quickly completed after the slates sink along the falling water hole, and the settled slates are not easily influenced by the rise and fall of underground water.
4. According to the invention, C30 concrete is poured until the rubble is completely covered, and after gaps among the rubbles are filled, the rubbles are bonded into blocks, so that the anti-scouring capability of the rubbles is greatly improved.
5. The C30 reinforced concrete rib-type cover plate has larger dead weight, can effectively counteract the recoil force of groundwater backflow, and obviously enhance the effect of blocking the water falling hole.
6. The ribbed plate of the C30 reinforced concrete ribbed cover plate faces one side of the road bed, so that the friction resistance between the cover plate and the road bed is greatly enhanced, and the cover plate is fixed by fully utilizing the self weight of the road bed, so that the cover plate is not easy to shift and deform due to the backflow of underground water.
Drawings
FIG. 1 is a schematic view of the processing of a water falling hole in the karst landform road subgrade range in the embodiment;
FIG. 2 is a schematic view of the reinforced concrete ribbed decking of FIG. 1;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
the names of the sequence numbers in the figure are:
1. rubble, 2, C30 concrete, 3, C30 rubble concrete, 4, leveling layer, 5, C30 reinforced concrete rib-type cover plate, 6 and ground line.
Detailed Description
The technical solution of the present invention is described clearly and completely with reference to the following embodiments, which are only a part of the present invention, but not all of the embodiments.
As shown in the figure:
example 1
The method can complete the treatment of the water falling hole in the karst landform road subgrade range by adopting the following steps:
(1) water pumping and sewage discharging are carried out, so that the water level of the water falling hole is effectively reduced;
(2) uniformly throwing the flaky stones 1 along the water falling hole by using an excavator, compacting and pressing the flaky stones 1 into the sludge by using a machine bucket, wherein the particle size of the flaky stones 1 is not less than 70 cm.
(3) And after the rubble 1 is thrown to the designed elevation, C30 concrete 2 is poured until the rubble 1 is completely covered, and the rubble is vibrated and compacted.
(4) Pouring C30 stone concrete 3 to the designed elevation of the cover plate bottom; the content of C30 rubble concrete rubble is 30%, and the particle size of the rubble is 60-80 cm.
(5) After the C30 rubble concrete layer is consolidated, the site is leveled, a C30 reinforced concrete rib-shaped cover plate 5 is applied, and a leveling layer 4 is arranged between the cover plate and the rubble concrete layer; the side line of the C30 reinforced concrete rib-type cover plate 5 needs to be 5m larger than the side line of the water surface, and the leveling layer 4 is made of C15 concrete and is 10cm thick.
(6) And (4) removing humus on the 6 side slopes of the ground line, wherein the two side slopes need to meet the design requirements.
(7) And backfilling the roadbed to a designed elevation by layering and rolling, wherein the continuous thickness after layering and rolling is not less than 50 cm.
The C30 reinforced concrete rib type cover plate rib post is towards road bed one side, and the floor interval is 5000 mm.
The C30 reinforced concrete rib-type cover plate adopts C10-C28 steel bars; wherein the bottom plate adopts double-layer bidirectional C16 steel bars, and the distance is 20 cm; the rib plates adopt C10 double stirrups and C16 tie bars, and the space is 200mm and 400mm respectively; 10C 16 longitudinal steel bars are arranged on two sides of the rib plate; 4C 28 single-layer main ribs are arranged on the top surfaces of the rib plates; 28C 28 double-layer main ribs are arranged at the joint of the bottom plate and the rib plate.
Application examples
1. The applicant applies the method of the embodiment 1 to the treatment of the roadbed in a certain project in the new five-quadrant region of south-Guangxi city, the traffic flow of the road section is large, more than 30% of the road section is passed by trucks, the project has been completed and passed by trucks for more than two years, and the road surface and the roadbed are still good. The specific implementation parameters are shown in fig. 1-3.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (2)
1. A method for processing a water falling hole in a karst landform road subgrade range is characterized by comprising the following processing steps:
(1) water pumping and sewage discharging are carried out, so that the water level of the water falling hole is effectively reduced;
(2) uniformly throwing the flaky stones along the water falling hole, and ramming and pressing the flaky stones into the sludge;
(3) after the rubble is thrown to the designed elevation, concrete is poured until the rubble is completely covered, and the rubble is vibrated and compacted; c30 concrete is adopted for pouring concrete, C30 concrete is poured until the flaky stones are completely covered, and after gaps among the flaky stones are filled, the flaky stones are bonded into blocks, so that the anti-scouring capability of the flaky stones is greatly improved;
(4) pouring the stone slab concrete to the designed elevation of the bottom of the cover plate; the flaky stone concrete is C30 concrete, and the mixing amount of the flaky stone is 30%;
(5) after the rubble concrete layer is consolidated, leveling the field, applying a reinforced concrete rib-shaped cover plate, and arranging a leveling layer between the cover plate and the rubble concrete layer; the reinforced concrete rib-type cover plate adopts C10-C28 steel bars, wherein the bottom plate adopts double-layer bidirectional C16 steel bars, and the distance is 18-22 cm; the rib plates adopt C10 double stirrups and C16 tie bars, and the space is respectively 220mm and 420 mm; 8-12C 16 longitudinal steel bars are arranged on two sides of the ribbed slab; 3-5C 28 single-layer main ribs are arranged on the top surfaces of the rib plates; 26-30C 28 double-layer main ribs are arranged at the joint of the bottom plate and the rib plate; the reinforced concrete rib-type cover plate has larger self weight, can effectively offset the recoil force of underground water flowing backwards, and obviously enhances the effect of plugging the water falling hole; the sidelines of the reinforced concrete rib-shaped cover plate need to be 5m larger than the sidelines of the water surface, the leveling layer adopts C15 concrete and has the thickness of 10cm, the rib columns of the reinforced concrete rib-shaped cover plate face one side of the road bed, the distance between the rib plates is 5000mm, the friction resistance between the cover plate and the road bed is greatly enhanced, and meanwhile, the cover plate is fixed by fully utilizing the dead weight of the road bed, so that the cover plate is not easy to shift and deform due to the backflow of underground water;
(6) removing humus from the side slope, and ensuring that the side slopes on the two sides meet the design requirements;
(7) and backfilling the roadbed to a designed elevation by layering and rolling, wherein the continuous thickness after layering and rolling is not less than 50 cm.
2. The method for processing the water falling hole in the karst landform road bed range according to claim 1, characterized in that: the particle size of the flaked stone in the step (2) is not less than 70 cm.
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| CN113944223B (en) * | 2021-12-06 | 2022-07-26 | 中国地质科学院岩溶地质研究所 | Drought and flood disaster treatment method based on karst peak-cluster depression group water flow combined regulation and control |
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| "利万高速公路湖北段岩溶路基处治方案设计";陈武等;《公路与汽运》;20120915(第５期);第3节，图2、5 * |
| "岩溶地区路基内落水洞的处理方法";陆宇翔;《大众科技》;20050915(第9期);第120-122页 * |
| "岩溶隧道运营期病害处治技术";冯升等;《采矿技术》;20120915;第12卷(第5期);第33-36页 * |
| "广西河池水任至南宁公路岩溶路基病害特点及防治技术";邓家喜等;《中国岩溶》;20050615;第24卷(第2期);第128-134页 * |
| "浅析岩溶地区溶洞的处理方法";杨明;《四川水泥》;20140815(第8期);第85页 * |
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