CN113356182A - Karst area karst cave overburden grouting reinforcement structure and design method thereof - Google Patents
Karst area karst cave overburden grouting reinforcement structure and design method thereof Download PDFInfo
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- CN113356182A CN113356182A CN202110649012.7A CN202110649012A CN113356182A CN 113356182 A CN113356182 A CN 113356182A CN 202110649012 A CN202110649012 A CN 202110649012A CN 113356182 A CN113356182 A CN 113356182A
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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
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Abstract
The invention provides a karst region karst cave overburden grouting reinforcement structure and a design method thereof, and relates to the field of karst reinforcement. The karst area karst cave sequentially comprises limestone, the karst cave and the limestone from bottom to top, and the design method comprises the following steps of S1: surveying the karst cave position of the karst area; after the survey is completed, the survey locations are uniformly perforated S2. According to the invention, the punching depth is 6-12 meters, the filling of materials is carried out within 6-12 meters of the hole, the filling task of the deep karst cave is completed, a supporting foundation is provided for subsequent work, the task of eliminating the karst cave is achieved, the integral stability of the device is improved, the reinforcing effect is good, the material consumption for reinforcing is reduced, the karst cave is poured for the first time, the supporting effect is achieved by pouring for the second time, after the third pouring, cement is leveled and isolated by the isolating grooves, the isolating grooves are used for shunting and discharging flood of water resources, and the integral reinforcing period is short.
Description
Technical Field
The invention relates to the technical field of karst reinforcement, in particular to a karst area karst cave overburden grouting reinforcement structure and a design method thereof.
Background
The karst region is mainly concentrated in the southwest region. The karst area in the southwest area accounts for more than one third of the area of the width of the members in the southwest area. The karst area has complex topography, fragile ecological environment, weak infrastructure such as traffic and the like, so people live in poor conditions. The construction of the south-west karst area is combined with ecological environment construction and protection, natural grassland recovery and grassland construction are carried out, grass industry and animal husbandry are developed, and the construction of the south-west Daisiang of Shanqingshuihu Fuyuankang is a major strategic measure in the implementation of the western major development in China. The rock desertification situation of the karst region in southwest of China, which is called as the ecological cancer, is severe, and the rock desertification land area still shows the expansion trend on the whole.
Karst is also known as Karst (Karst), the name of the place of the limestone plateau of Islamic Selands in northwest of former south-south Spalfa, which means the bare place of the rock where there are various peculiar limestone terrains. At the end of the 19 th century, former schwergun (j. cvijic) studied various limestone terrains in karst highlands, called a series of special geomorphic processes and hydrological phenomena in carbonate areas by the term of karst, and then the term of karst became a special term in world geology and both of them were used in China. Currently, most scholars consider: karst refers to the destruction and modification of soluble rocks by ground water and surface water and the hydrological and topographic phenomena formed thereby. Karst topography develops not only in carbonate rock areas but also in other areas where soluble rocks (sulfate, halide) are distributed, but the karst topography in carbonate rock areas is the most extensive and spectacular. Karst landforms are widely distributed in China. The distribution area of carbonate rocks in China is about 130 km2, the distribution area is concentrated and wide by limestone rocks in Guangxi, Guangdong, Yunnan, Guizhou, Sichuan, Hubei and Hunan, the area accounts for about half of the distribution area in China, and Guangxi Guilin mountain water and Yunnan Kelin are famous for the unique karst landform. The national economy of the karst region is established with its uniqueness. In karst development areas, surface water systems do not develop, but contain abundant underground water resources. Therefore, by researching the karst landform, the distribution rule of the karst water is mastered, and the water source required by industrial, agricultural and civil drinking water is exploited. It has important significance for industrial and agricultural production. In addition, many karst caves and rivers develop in the karst area, so when the industrial and agricultural construction planning is carried out in the areas, the karst area needs to be avoided as much as possible, and if the karst area cannot be avoided, anti-seepage measures and the like need to be taken.
The existing reinforcement mainly comprises measures of blasting backfill, filling, dynamic compaction, grouting and the like, but is only suitable for the condition that a karst cave is buried shallowly. When the karst cave is deeply buried, if a drilling blasting mode is adopted, although the top plate of the karst cave can be exploded, the overlying soil layer is collapsed, and the blasting opening is easily buried. Even if blasting is successful, due to the deep burial, there is a great risk if backfilling is performed manually or mechanically. If the karst cave is filled by adopting a grouting mode, the karst caves are often communicated with each other, and the grouting is carried out along with the loss of underground water everywhere, so that excessive materials are consumed, and the effect is also quite inconsistent. Therefore, a grouting reinforcement structure for an overburden layer on a karst cave in a karst region and a design method thereof are provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a karst cave overburden grouting reinforcement structure and a design method thereof, and solves the problems of poor reinforcement effect, high reinforcement material consumption and long reinforcement period in a karst area.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a karst region karst cave overlying soil layer grouting reinforcement structure and a design method thereof are provided, wherein the karst region karst cave sequentially comprises limestone, a karst cave and limestone from bottom to top.
Preferably, the design method comprises the steps of,
s1: surveying the karst cave position of the karst area;
s2, after the survey is finished, uniformly punching the survey position;
s3, removing the punching equipment after punching, and pouring the hole position;
s4, before the concrete is poured and not solidified, steel bars are poured, and the cement poured by the steel bars is solidified;
s5, secondary pouring is carried out at the position of the coagulated reinforcing steel bar;
s6, cutting the steel bars to enable the steel bars to be arranged in parallel;
s7, binding the top of the steel bar in the transverse and longitudinal directions;
s8, performing three pouring tasks after binding and welding;
and S9, after the three times of pouring, carrying out leveling and groove separation on the cement.
Preferably, the joint position of the limestone and the limestone in the step S2 is punched through punching equipment, the punching depth is 6-12 meters below the limestone, and the distance between adjacent hole sites is 6-8 meters.
Preferably, in step S3, the hole site is cast, and a casting task is performed in a cavern with a perforated depth.
Preferably, in step S5, the position of the steel bar is corrected to make the steel bar be perpendicular to the ground, and the steel bar is poured to a position 0.5 m above the ground.
Preferably, in step S6, the height between the top of the steel bar and the top of the secondary pouring is 0.5-1.5 m.
Preferably, in step S7, after the binding is completed, the welding task is performed.
Preferably, in step S8, the height of three times of pouring is 10cm higher than the binding position.
The working principle is as follows: firstly, surveying the karst cave position, the work area, the karst cave position and the karst cave depth of a karst area; after surveying is completed, uniformly punching holes at surveying positions, wherein the punching depth is 6-12 m, and material injection filling is performed within 6-12 m of the holes, so that the filling task of the karst cave with the depth is completed, a supporting foundation is provided for subsequent work, the task of eliminating the karst cave is achieved, the overall stability of the device is improved, the reinforcing effect is good, and the material consumption for reinforcing is reduced; the distance between adjacent punched hole sites is 6-8 m, reinforcing steel bars are injected into the hole sites, cement poured by the reinforcing steel bars is condensed, the reinforcing steel bars form an array after being bound and welded, the overall stability of the device is improved, and a support foundation is provided for a reinforced structure by combining three pouring processes; after the punching is finished, removing the punching equipment, and pouring the hole position; before pouring and not coagulating, pouring reinforcing steel bars, and coagulating cement poured by the reinforcing steel bars; performing secondary pouring at the position of the coagulated steel bar, correcting the position of the steel bar to enable the steel bar to be vertically arranged with the ground, and performing secondary pouring to a position 0.5 m higher than the ground, wherein the secondary pouring is used for stabilizing the steel bar body, and the secondary pouring to a position 0.5 m higher than the ground increases the contact area with the ground, so that the stability of the array at the later stage is improved; cutting the steel bars to enable the steel bars to be arranged in parallel, wherein the height between the steel bars and the top of the secondary pouring is 0.5-1.5 m; binding the top of the steel bar in a transverse and longitudinal manner; after binding and welding, carrying out three pouring tasks; after the third pouring, the cement is leveled and separated from the grooves, the third pouring height is 10cm higher than the binding position, the karst cave is poured for the first time, the second pouring plays a supporting role, after the third pouring, the cement is leveled and separated from the grooves, the separated grooves are used for shunting water resources and discharging flood, and the whole reinforcement period is short.
(III) advantageous effects
The invention provides a grouting reinforcement structure for an overburden layer on a karst cave in a karst region and a design method thereof.
The method has the following beneficial effects:
1. the invention provides a karst region karst cave overburden grouting reinforcement structure and a design method thereof, wherein the punching depth is 6-12 meters, the hole is filled with injected materials within 6-12 meters, the filling task of the karst cave with the depth is completed, a support foundation is provided for subsequent work, the task of eliminating the karst cave is achieved, the integral stability of a device is improved, the reinforcement effect is good, and the material consumption for reinforcement is reduced.
2. The invention provides a karst region karst cave overburden grouting reinforcement structure and a design method thereof, wherein the distance between adjacent hole sites of holes is 6-8 m, reinforcing steel bars are injected into the hole sites, cement poured by the reinforcing steel bars is condensed, the reinforcing steel bars form an array after binding and welding, the integral stability of a device is improved, and a support foundation is provided for the reinforcement structure by combining three pouring.
3. The invention provides a karst area karst cave overburden grouting reinforcement structure and a design method thereof, wherein secondary pouring is used for stabilizing a steel bar body, the secondary pouring is 0.5 m higher than the ground, the contact area with the ground is increased, and therefore the stability of a later-period array is improved.
4. The invention provides a karst area karst cave overburden grouting reinforcement structure and a design method thereof.
Drawings
FIG. 1 is a schematic diagram of a grouting reinforcement structure of an overburden layer on a karst cave in a karst region and a punching structure of a design method of the grouting reinforcement structure;
FIG. 2 is a schematic structural diagram of reinforcing steel bar binding and welding in a karst cave grouting reinforcement structure and a design method thereof in a karst region;
FIG. 3 is a flow chart of a grouting reinforcement structure for an overburden layer in a karst cave in a karst region and a design method thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example (b):
as shown in fig. 1 to 3, an embodiment of the present invention provides a karst region karst cave overburden grouting reinforcement structure and a design method thereof, wherein the structure is characterized in that: the karst cave in the karst region sequentially comprises limestone, the karst cave and limestone from bottom to top.
The design method comprises the following steps of,
s1: surveying the karst cave position of the karst area;
s2, after the survey is finished, uniformly punching the survey position;
s3, removing the punching equipment after punching, and pouring the hole position;
s4, before the concrete is poured, the steel bar is poured, the cement poured by the steel bar is solidified, and before the concrete is solidified, the steel bar is corrected to be vertical;
s5, secondary pouring is carried out at the position of the coagulated reinforcing steel bar;
s6, cutting the steel bars to enable the steel bars to be arranged in parallel;
s7, binding the top of the steel bar in the transverse and longitudinal directions;
s8, performing three pouring tasks after binding and welding;
and S9, after the three times of pouring, carrying out leveling and groove separation on the cement.
Surveying the work area, and the cavern location and depth.
Punching the joint position of the limestone and the limestone in the step S2 by using punching equipment, wherein the punching depth is 6-12 meters below the limestone, and the distance between adjacent hole positions is 6-8 meters; the drilling depth is 6-12 meters, the filling of materials is carried out within 6-12 meters of the holes, the filling task of the deep karst cave is completed, a supporting foundation is provided for subsequent work, the task of eliminating the karst cave is achieved, the integral stability of the device is improved, the reinforcing effect is good, and the material consumption for reinforcing is reduced; the adjacent hole site distance that will punch is 6 ~ 8 meters, pours into the reinforcing bar at the hole site simultaneously, and the cement that the reinforcing bar was pour condenses, and the reinforcing bar forms the array after binding the welding, and hoisting device's holistic stability combines three to pour, provides the support foundation for reinforced structure.
In the step S3, the hole site is poured, and a pouring task is performed on the karst cave within the punching depth.
In step S5, the position of the steel bar is corrected, the steel bar is perpendicular to the ground, the steel bar is poured twice to a position 0.5 m higher than the ground, the steel bar body is stabilized through the secondary pouring, the contact area between the steel bar body and the ground is increased through the secondary pouring to a position 0.5 m higher than the ground, and therefore the stability of the array in the later period is improved.
In the step S6, the height of the top of the steel bar and the secondary pouring is 0.5-1.5 m.
In step S7, after the binding is completed, a welding task is performed.
In the step S8, the third pouring height is 10cm higher than the binding position, the karst cave is poured for the first time, the second pouring plays a supporting role, after the third pouring, the cement is leveled and separated by grooves, the separated grooves are used for shunting water resources and discharging flood, and the whole reinforcement period is short.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A karst area karst cave overburden grouting reinforcement structure and a design method thereof are characterized in that: the karst cave in the karst region sequentially comprises limestone, the karst cave and limestone from bottom to top.
2. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: the design method comprises the following steps of,
s1: surveying the karst cave position of the karst area;
s2, after the survey is finished, uniformly punching the survey position;
s3, removing the punching equipment after punching, and pouring the hole position;
s4, before the concrete is poured and not solidified, steel bars are poured, and the cement poured by the steel bars is solidified;
s5, secondary pouring is carried out at the position of the coagulated reinforcing steel bar;
s6, cutting the steel bars to enable the steel bars to be arranged in parallel;
s7, binding the top of the steel bar in the transverse and longitudinal directions;
s8, performing three pouring tasks after binding and welding;
and S9, after the three times of pouring, carrying out leveling and groove separation on the cement.
3. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 2, wherein: and punching the joint position of the limestone and the limestone in the step S2 by using punching equipment, wherein the punching depth is 6-12 meters below the limestone, and the distance between adjacent hole sites is 6-8 meters.
4. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: in the step S3, the hole site is poured, and a pouring task is performed on the karst cave with the depth of the hole.
5. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: in the step S5, the position of the steel bar is corrected to make the steel bar be perpendicular to the ground, and the steel bar is poured to a position 0.5 m above the ground for the second time.
6. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: in the step S6, the height of the top of the steel bar and the secondary pouring is 0.5-1.5 m.
7. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: in step S7, after the binding is completed, a welding task is performed.
8. The karst region karst cave overburden grouting reinforcement structure and the design method thereof as claimed in claim 1, wherein: in the step S8, the height of the three times of pouring is 10cm higher than the binding position.
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| RU2018140798A (en) * | 2018-11-19 | 2020-05-19 | Владимир Алексеевич Перминов | METHOD FOR LIQUIDATION OF UNDERGROUND STORAGES OF LAYERED HYDROCARBON RAW MATERIALS WITH RESERVOIRS CONTAINED IN STONE SALT AND OTHER ROCKS, INCLUDING MULTI-FROZEN, AND ALSO TAKE AWAY. |
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2021
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102425082A (en) * | 2011-09-09 | 2012-04-25 | 中铁二院工程集团有限责任公司 | Subgrade strengthening structure for highly karstified station turnout zone on high-speed railway |
| CN105696427A (en) * | 2016-04-06 | 2016-06-22 | 中铁第四勘察设计院集团有限公司 | Construction method for reinforcing newly-built railway karst foundation and roadbed structure thereof |
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| CN108894214A (en) * | 2018-08-27 | 2018-11-27 | 孙德明 | A kind of solution cavity geological environment bored concrete pile and its bore forming method |
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