CN114855832B - Advanced pre-reinforcement method for preventing strip mine rock bedding slope from being unstable - Google Patents
Advanced pre-reinforcement method for preventing strip mine rock bedding slope from being unstable Download PDFInfo
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- CN114855832B CN114855832B CN202210492231.3A CN202210492231A CN114855832B CN 114855832 B CN114855832 B CN 114855832B CN 202210492231 A CN202210492231 A CN 202210492231A CN 114855832 B CN114855832 B CN 114855832B
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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
- E02D17/20—Securing of slopes or inclines
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/205—Securing of slopes or inclines with modular blocks, e.g. pre-fabricated
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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
- E02D17/20—Securing of slopes or inclines
- E02D17/207—Securing of slopes or inclines with means incorporating sheet piles or piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/23—Dune restoration or creation; Cliff stabilisation
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses an advanced pre-reinforcement method for preventing strip mine rock from being unstable along a layer side slope, wherein a pile top groove (1) is positioned right above a sliding surface (5) at the lower part of a side slope platform, and concrete slabs (2) are poured in the pile top groove (1); 2-4 rows of seamless steel pipes (3) are arranged in the side slope platform drilling holes and penetrate through the submerged sliding surface (5), slurry holes (7) are formed in the pipe walls of the seamless steel pipes (3), the whole seamless steel pipes (3) are filled with grouting concrete, and the submerged sliding surface (5) is filled with grouting concrete through the slurry holes (7) to form interlayer concrete (6). The invention can effectively reduce the influence of stress disturbance in the surface mine slope backing process, and simultaneously the supporting and retaining effect of the pile-rock composite structure and the interlayer concrete filled into the weak structural surface through the slurry holes of the steel pipe body can obviously improve the stability of the slope backing, and the reinforcing structure embedded under the road surface does not influence the normal passing of the step road surface, so that the use efficiency of the step road surface can be effectively improved.
Description
Technical Field
The invention belongs to the technical field of surface mine slope treatment, and particularly relates to an advanced pre-reinforcement method for mine surface slope treatment, which is particularly suitable for advanced pre-reinforcement treatment of non-coal mine rock bedding slopes and prevention of slope instability.
Background
With the high-speed development of economy, large-scale development of infrastructure construction needs to realize mass exploitation of resources, and large-scale landslide accidents are caused in each place by the influence of complex geological conditions and topography, and the landslide accidents pose a great threat to life and property safety of people.
For surface mining, disturbance caused by manual mining activities to mine slope rock mass runs through the whole mine slope service period, so that the surface mine slope is always in a dynamic evolution process in the mining process. The dynamic mining process of the strip mine side slope determines that the side slope has special power damage evolution rules and displacement response characteristics in the mining process, particularly under the coupling effect of side slope mining disturbance, unloading power change and blasting damage, the side slope can continuously conduct stress redistribution and sliding force increase, so that the side slope stability is gradually reduced, once the side slope is unstable, huge loss can be caused to the mining work, and meanwhile, irrecoverable disasters are brought to the life and property safety of people.
Mine slope disasters are caused by the fact that the mine slope accidents are caused by sudden disasters caused by human mining activities, and the main reasons for the mine slope accidents are caused by the fact that the slope lacks of stability. In China, the phenomenon of mine slope landslide is common, particularly for high slope areas, the high slope areas are easy to form large-scale landslide bodies, and once the large-scale landslide bodies appear, the range related to landslide disasters can reach more than hundreds of thousands of square meters. Therefore, in the mine engineering construction process, the maintenance of the slope stability is an important working content, and in the current stage, in order to avoid the safety hazard caused by the slope landslide, along with the process of mining, a certain treatment means is needed to be adopted to maintain the stability of the mine slope, so that the landslide hazard is reduced.
The problem of the side slope of the strip mine directly affects the economic effect of the mining of the strip mine and the safety of production. For the core component of landslide, firstly, the sliding force is increased, and secondly, the anti-sliding force is reduced. At present, slope treatment of most non-coal strip mines is basically a slope reinforcement mode performed after a slope empty face is formed after excavation, for example, a combined reinforcement method for slope landslide treatment with a patent number ZL201610437144.2 is adopted, so that the slope stability can be effectively improved by adopting a pile-anchor-beam combined structure, but the post-reinforcement mode has great defects, and when the slope rock is excavated to form the slope empty face, irreversible disturbance occurs to the stress state of the slope, sliding of the slope, internal cracks and the like due to an unloading degradation mechanism, so that the stability of the whole slope is affected, and the danger and treatment cost in the reinforcement process are increased.
Therefore, the development of the advanced pre-reinforcement method which is convenient to construct, low in cost, safe and reliable and is suitable for the bedding side slope treatment of the non-coal surface mine rock mass is necessary.
Disclosure of Invention
In order to meet the requirements of non-coal surface mine rock bedding slope treatment, overcome the defect of the existing slope lag reinforcement treatment, improve the mine slope stability, reduce the slope treatment cost and ensure the mine safety continuous production, the invention provides a lead pre-reinforcement method for preventing the surface mine rock bedding slope from being unstable, which can obviously reduce the irreversible rock damage of the slope rock to improve the stability of the surface mine slope and ensure that the invention fully plays the pre-reinforcement effect and does not influence the normal passage of the step road.
In order to achieve the above object, the advanced pre-reinforcement method for preventing the rock-forward slope instability of the strip mine is implemented by constructing an advanced pre-reinforcement structure:
the advanced pre-reinforcement structure is formed by combining pile top connection structures and grouting pile body structures. The pile top connecting structure consists of a pile top groove excavated downwards on the slope platform and concrete plates poured in the pile top groove, wherein the pile top groove is a cubic space which is excavated in advance before drilling and is used for accommodating the concrete plates, and the pile top groove is positioned right above a sliding surface at the lower part of the slope platform; the grouting pile body structure comprises 2-4 rows of seamless steel pipes which are arranged in the holes of the slope platform and penetrate through the submerged sliding surface, the bottom ends of the seamless steel pipes penetrate into the stable bedrock at the lower part of the submerged sliding surface, the seamless steel pipes are vertically arranged on the slope top pavement of the slope of the backup slope, the upper parts of the seamless steel pipes are positioned in pile top grooves and are connected with concrete slabs, and the top ends of the seamless steel pipes are flush with the pavement; the wall of the seamless steel pipe is provided with a slurry hole, grouting concrete is filled in the seamless steel pipe, the seamless steel pipe and the grouting concrete are mutually bonded to form a grouting pile body, and under a certain grouting pressure, the grouting concrete can rapidly fill the whole seamless steel pipe and fill a weak structural surface-a sliding surface between the forward layers through the slurry hole to form interlayer concrete; and the 2-4 rows of seamless steel pipes and the grouting concrete form a miniature steel pipe pile group.
The construction steps are as follows:
1) Before rock mass excavation to be excavated, acquiring the state and position information of a bedding soft interlayer or a structural surface inside a slope body according to the drilling data of the slope body, carrying out perforating treatment at the corresponding position on the wall of the seamless steel pipe, and drilling 1-3 circles of slurry holes, wherein each circle of slurry holes are distributed in an inclined plane so that grouting concrete can be filled into the soft structural surface between bedding through the slurry holes to form interlayer concrete;
analyzing and predicting the stable state and the development trend of the landslide body in the digging process by means of theoretical analysis and numerical simulation, and determining the proper time for obtaining the final slope for advanced reinforcement construction;
2) After the proper time of advanced reinforcement construction is obtained, a pile top groove is cut on a slope top road surface of a final slope step, the position of the pile top groove is positioned in the range of the sliding surface corresponding to the road surface, and the size of the pile top groove is determined through calculation of the anti-sliding stability of the structure;
3) According to the position and the size of the set pile top groove, adopting mine rock drilling equipment to drill a plurality of rows of holes in the pile top groove, and clearing the holes in time to reduce the influence of hole collapse of part of hole walls, wherein the holes are arranged in a rectangular arrangement, and the hole bottoms of all the holes penetrate through a stable rock stratum with a sliding surface below the sliding surface; in order to ensure the verticality of the drilling hole, the inclination of the drilling hole is measured at intervals in the drilling process, and the inclination deviation is not more than 1%;
4) The seamless steel pipes are distributed into the drilled holes, the top ends of the seamless steel pipes are flush with the road surface of the platform beyond the bottom surface of the pile top groove, and a plurality of rows of drilled holes and the seamless steel pipes are grouted by adopting a bottom-up grouting method to form miniature steel pipe pile groups;
5) And uniformly filling concrete into the pile top grooves to form concrete plates, so that the concrete is filled between seamless steel pipes at the tops of the miniature steel pipe pile groups to form a pile top connection structure, and the top surfaces of the concrete plates are flush with the step road surface so as to facilitate the running of vehicles on the slope platform.
In the step 1), the method is characterized in that the method is carried out by means of a built-in strength folding method of numerical simulation software FLAC3D, and by combining a traditional limit balance method, the stable state and the development trend of a landslide body in the digging process are analyzed and predicted, and the proper time for obtaining the final slope for advanced reinforcement construction is determined.
Further, in the step 4), grouting pressure is controlled between 0.6 and 0.8MPa, and under the pressure, grouting concrete can rapidly fill the whole pile body and efficiently fill a weak structural surface between the compliant layers through a pipe body slurry hole to form interlayer concrete.
The thickness of the concrete slab is generally 300-350 mm, and the length and the width of the concrete slab exceed 100-150 mm of the edge of the miniature steel pipe pile group through structural anti-slip stability calculation.
The number of the seamless steel tube rows is preferably 2-3 according to the height of the step, the sliding force and the range of the sliding surface; the length of the bottom end of the seamless steel pipe, which penetrates into the stable bedrock at the lower part of the submerged sliding surface, accounts for about 1/4 of the length of the steel pipe pile, but is not less than 1/5 of the length of the steel pipe pile.
Further, the row spacing of the seamless steel pipes in the miniature steel pipe pile group is 1000 mm-1500 mm, the spacing between adjacent seamless steel pipes in each row is 1200 mm-2000 mm, and plum blossom type staggered arrangement is preferable.
As a preferable scheme of the invention, the outer diameter of the seamless steel pipe is preferably 120-180 mm, and the diameter of the slurry hole is preferably 13-20 mm; the length of the bottom end of the seamless steel pipe penetrating into the stable bedrock at the lower part of the submerged sliding surface is better than 1/4 of the length of the steel pipe pile.
After the technical scheme is adopted, the advanced pre-reinforcement method for preventing the rock bedding slope instability of the strip mine has the following positive effects:
(1) The advanced pre-reinforcement construction is carried out before the slope is backed up in the strip mine, so that the influence of stress disturbance of the slope in the process of excavating the slope can be effectively reduced, the excavating process is safer, and the slope is more stable after the slope is backed up.
(2) The invention can perform construction in narrow spaces such as a step slope top platform and the like, can reuse mine blasting rock drilling equipment nearby, does not need new equipment, and is more flexible and convenient in construction operation.
(3) The pile top connecting structure adopted by the invention is on the same horizontal plane with the platform pavement, namely the upper surface of the concrete slab and the top end of the seamless steel pipe are flush with the pavement, so that the advanced reinforcement effect is achieved, the normal passing of the platform pavement can be ensured, and the utilization rate of the pavement area is improved.
(4) The concrete slurry in the grouting pile body structure adopted by the invention can accurately and efficiently fill the weak interlayer between rock layers through the slurry holes of the seamless steel pipe body, increases the cohesive force and the internal friction angle between the rock layers, forms a pile-rock composite structure, and remarkably improves the overall stability of the slope of the backup side.
(5) According to the invention, the pile top groove is cut downwards on the slope top road surface of the final slope step, the pile top groove is drilled downwards, the seamless steel pipe is inserted downwards in the drilled hole, the construction is convenient, the construction efficiency is high, the construction period is short, and the method is particularly suitable for being rapidly applied in an emergency state.
Drawings
FIG. 1 is a schematic cross-sectional view of a pre-reinforcement structure constructed by a pre-reinforcement method for preventing strip mine rock from destabilizing along a bedding slope according to the present invention;
FIG. 2 is a schematic plan view of a pile top connection structure employed in the present invention;
FIG. 3 is a schematic drawing of an open cross-section of a seamless steel tube employed in the present invention;
fig. 4 is an overall schematic view of the exterior opening of the seamless steel pipe employed in the present invention.
Reference numerals: 1-pile top groove; 2-concrete slab; 3-seamless steel tube; 4-rock mass to be excavated; 5-a diving slip surface; 6-interlayer concrete; 7-pulp holes.
Detailed Description
For further description of the present invention, a method for advanced pre-reinforcement for preventing surface slope destabilization of strip mine rock is described in further detail below with reference to the accompanying drawings.
The cross-section schematic diagram of the advanced pre-reinforcement structure for preventing the strip mine rock from being unstable along the layer side slope is shown in fig. 1, and the advanced pre-reinforcement structure for preventing the strip mine rock from being unstable along the layer side slope is realized by constructing the advanced pre-reinforcement structure in combination with fig. 2, 3 and 4.
The advanced pre-reinforcement structure is formed by combining pile top connection structures and grouting pile body structures; the pile top connecting structure is composed of a pile top groove 1 excavated downwards on a side slope platform and a concrete slab 2 poured in the pile top groove 1, wherein the pile top groove 1 is a cubic space for containing the concrete slab, the concrete slab 2 is a C30 poured concrete slab, the thickness of the concrete slab 2 is 300-350 mm, the pouring position of the concrete slab is positioned in the pile top groove 1 excavated in advance, the pile top groove 1 is positioned right above a sliding surface 5 at the lower part of the side slope platform, and the pile top groove 1 is also positioned on a side slope platform in a rock body 4 to be excavated. The grouting pile body structure comprises 2-3 rows of seamless steel pipes 3 which are arranged in side slope platform drilling holes and penetrate through a sliding surface 5, the bottom ends of the seamless steel pipes penetrate into stable bedrock at the lower part of the sliding surface 5, the outer diameter of the seamless steel pipes 3 is 120-180 mm, the length of the bottom ends of the seamless steel pipes 3 penetrating into the stable bedrock at the lower part of the sliding surface 5 is about 1/4 of the length of a steel pipe pile, the seamless steel pipes 3 are vertically distributed on the slope top road surface of a side slope, the upper parts of the seamless steel pipes 3 are positioned in pile top grooves 1 and are connected with concrete slabs 2, and the top ends of the seamless steel pipes 3 are flush with the road surface; the pipe wall of the seamless steel pipe 3 is provided with a slurry hole 7, and the diameter of the slurry hole 7 is 15mm; grouting concrete is poured into the seamless steel tube 3, the model of the grouting concrete is M30, the grouting pressure is generally not lower than 0.6-0.8 MPa, and the grouting concrete can rapidly fill the whole seamless steel tube 3 and is filled into the submerged sliding surface 5 through the grout holes 7 to form interlayer concrete 6; the 2-3 rows of seamless steel pipes 3 and grouting concrete form a miniature steel pipe pile group, the row spacing of the seamless steel pipes 3 in the miniature steel pipe pile group is 1000-1500 mm, the spacing between adjacent seamless steel pipes 3 in each row is 1200-2000 mm, and plum blossom-shaped arrangement is adopted; the length and the width of the concrete slab 2 exceed the edges of the miniature steel pipe pile group by 100-150 mm.
The construction steps are as follows:
1) Before the rock mass 4 to be excavated is excavated, the production and position information, such as inclination, inclination angle, depth and the like, of a bedding soft interlayer or a structural surface in the slope body are obtained according to the drilling data of the slope to be excavated, the corresponding positions on the wall of the seamless steel pipe 3 are subjected to perforating treatment, 1-3 circles of slurry holes 7 are drilled, and each circle of slurry holes 7 are distributed in an inclined plane;
the method comprises the steps of analyzing and predicting the stable state and the development trend of a landslide body in the digging process by means of a built-in strength folding and subtracting method of numerical simulation software FLAC3D and combining a traditional limit balance method, and determining the proper time for obtaining a final slope for advanced reinforcement construction;
2) After the proper time of advanced reinforcement construction is obtained, a pile top groove 1 is cut on a slope top road surface of a final backup slope step, the position of the pile top groove 1 is positioned in the range of the potential sliding surface 5 corresponding to the road surface, and the size of the pile top groove 1 is determined through calculation of the anti-sliding stability of the structure;
3) According to the position and the size of the set pile top groove 1, a plurality of rows of drilling holes are formed in the pile top groove 1 by adopting mine rock drilling equipment nearby, holes are cleared in time to reduce the influence of hole collapse of part of hole walls, the drilling holes are arranged in a rectangular arrangement, and the bottoms of the drilling holes penetrate through a stable rock stratum below the sliding surface 5; in order to ensure the verticality of the drilling hole, the inclination of the drilling hole is measured at intervals in the drilling process, and the inclination deviation is not more than 1%;
4) The seamless steel pipes 3 are distributed into the drilled holes, the top ends of the seamless steel pipes 3 are flush with the road surface of the platform beyond the bottom surface of the pile top groove 1, a plurality of rows of drilled holes and the seamless steel pipes 3 are grouted by adopting a bottom-up grouting method to form miniature steel pipe pile groups, grouting pressure during grouting is controlled between 0.6 MPa and 0.8MPa, grouting speed is kept moderate, hole collapse is caused too fast, the integrity of a pile body is damaged too slowly, and anticorrosion measures are taken for the steel pipes according to environmental conditions;
5) And uniformly filling concrete into the pile top groove 1 to form a concrete slab 2, so that the concrete is filled between the seamless steel pipes 3 at the top of the miniature steel pipe pile group to form a pile top connecting structure, and the top surface of the concrete slab 2 is flush with the step road surface.
The advanced pre-reinforcement method for preventing the rock bedding slope instability of the strip mine has been applied to industrial tests of a certain large-scale strip mine and a certain large-scale nonferrous metal mine in China. The outdoor side slope of the test mine belongs to a rock bedding side slope, a bedding soft interlayer is arranged in the slope body, and the risk of instability of the side slope exists. In order to improve the stability of the strip mine side slope and ensure the safety of exploitation and transportation, the advanced pre-reinforcement structure is adopted. Test results show that after the advanced pre-reinforced structure is constructed, the influence of stress disturbance in the surface mine back side process can be effectively reduced, meanwhile, the supporting and retaining effect of the pile-rock composite structure and the interlayer concrete filled into the weak structural surface through the slurry holes of the steel pipe body can be remarkably improved, the stability of the back side slope can be remarkably improved, the normal passing of the step pavement is not influenced by the reinforced structure embedded under the pavement, the use efficiency of the step pavement can be effectively improved, and a very good use effect is achieved.
Claims (7)
1. An advanced pre-reinforcement method for preventing the destabilization of a strip mine rock bedding slope is characterized by being realized by constructing an advanced pre-reinforcement structure:
the advanced pre-reinforcement structure is formed by combining pile top connection structures and grouting pile body structures; the pile top connecting structure is composed of a pile top groove (1) excavated downwards on the slope platform and a concrete slab (2) poured in the pile top groove (1), wherein the pile top groove (1) is positioned right above a sliding surface (5) at the lower part of the slope platform; the grouting pile body structure comprises 2-4 rows of seamless steel pipes (3) which are arranged in a side slope platform drilling hole and penetrate through a sliding surface (5) and the bottom ends of which penetrate into stable bedrock at the lower part of the sliding surface (5), wherein the seamless steel pipes (3) are vertically arranged on a slope top road surface of a side slope, the upper parts of the seamless steel pipes (3) are positioned in pile top grooves (1) and are connected with concrete slabs (2) mutually, and the top ends of the seamless steel pipes (3) are flush with the road surface; a slurry hole (7) is arranged on the pipe wall of the seamless steel pipe (3), grouting concrete is poured into the seamless steel pipe (3), the whole seamless steel pipe (3) is filled with grouting concrete, and the grouting concrete is filled into the submerged sliding surface (5) through the slurry hole (7) to form interlayer concrete (6); the 2-4 rows of seamless steel pipes (3) and grouting concrete form miniature steel pipe pile groups;
the construction steps are as follows:
1) Before a rock mass (4) to be excavated is excavated, acquiring the production and position information of a bedding weak interlayer or a structural surface in the slope body according to the drilling data of the slope of the backup, carrying out perforating treatment on the corresponding position on the wall of the seamless steel pipe (3), and drilling 1-3 circles of slurry holes (7), wherein each circle of slurry holes (7) are distributed in an inclined plane;
analyzing and predicting the stable state and the development trend of the landslide body in the digging process by means of theoretical analysis and numerical simulation, and determining the proper time for obtaining the final slope for advanced reinforcement construction;
2) After the proper time of advanced reinforcement construction is obtained, a pile top groove (1) is cut on a slope top road surface of a final backup slope step, the position of the pile top groove (1) is positioned in the range of the submerged sliding surface (5) corresponding to the road surface, and the size of the pile top groove (1) is determined through calculation of the anti-sliding stability of the structure;
3) According to the position and the size of the set pile top groove (1), adopting mine rock drilling equipment to drill holes in multiple rows in the pile top groove (1), and clearing the holes in time to reduce the influence of hole collapse of part of hole walls, wherein the drill holes are arranged in a rectangular arrangement, and the bottoms of the drill holes penetrate through a stable rock stratum with a sliding surface (5) below the sliding surface (5); in order to ensure the verticality of the drilling hole, the inclination of the drilling hole is measured at intervals in the drilling process, and the inclination deviation is not more than 1%;
4) The seamless steel pipes (3) are distributed into the drilled holes, the top ends of the seamless steel pipes (3) exceed the bottom surface of the pile top groove (1) to be flush with the road surface of the platform, and a plurality of rows of drilled holes and the seamless steel pipes (3) are grouted by adopting a bottom-up grouting method to form miniature steel pipe pile groups;
5) And uniformly filling concrete into the pile top groove (1) to form a concrete slab (2), so that the concrete is filled between the seamless steel pipes (3) at the top of the miniature steel pipe pile group to form a pile top connecting structure, and the top surface of the concrete slab (2) is flush with the step road surface.
2. A method for advanced pre-reinforcement for preventing strip mine rock bedding slope destabilization according to claim 1, characterized by: in the step 1), the built-in strength folding and subtracting method of the numerical simulation software FLAC3D is used, and the traditional limit balance method is combined to analyze and predict the stable state and the development trend of the landslide body in the excavation process, so that the proper time for obtaining the final slope to perform advanced reinforcement construction is determined.
3. A method for advanced pre-reinforcement for preventing strip mine rock bedding slope destabilization according to claim 1, characterized by: in the step 4), the grouting pressure is controlled between 0.6 and 0.8MPa during grouting.
4. A pre-reinforcement method for preventing a strip mine rock bedding slope from destabilizing according to claim 1, 2 or 3, characterized by: the thickness of the concrete slab (2) is 300-350 mm, and the length and the width of the concrete slab (2) exceed the edges of the miniature steel pipe pile group by 100-150 mm.
5. A method for advanced pre-reinforcement to prevent strip mine rock bedding slope destabilization according to claim 4, characterized by: the number of the rows of the seamless steel pipes (3) is 2-3; the bottom end of the seamless steel pipe (3) is deep into the stable bedrock at the lower part of the diving surface (5) and has the length not less than 1/5 of the length of the steel pipe pile.
6. A method for advanced pre-reinforcement to prevent strip mine rock bedding slope destabilization according to claim 5, characterized by: the row spacing of the seamless steel pipes (3) in the miniature steel pipe pile group is 1000 mm-1500 mm, the spacing between adjacent seamless steel pipes (3) in each row is 1200 mm-2000 mm, and quincuncial staggered arrangement is adopted.
7. A method for advanced pre-reinforcement for preventing strip mine rock bedding slope destabilization according to claim 6, characterized by: the outer diameter of the seamless steel pipe (3) is 120-180 mm, and the diameter of the slurry hole (7) is 13-20 mm; the bottom end of the seamless steel pipe (3) stretches into the stable bedrock at the lower part of the submerged sliding surface (5) to be no less than 1/4 of the length of the steel pipe pile.
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| CN110821512A (en) * | 2019-11-23 | 2020-02-21 | 中铁二十局集团有限公司 | Loess tunnel entrance opening section pre-reinforcing and excavating construction method passing through landslide body |
| CN111549794A (en) * | 2020-05-28 | 2020-08-18 | 中铁二十二局集团第三工程有限公司 | Miniature supporting method and miniature pile supporting structure suitable for soft foundation treatment |
| CN114411774A (en) * | 2022-01-27 | 2022-04-29 | 中钢集团马鞍山矿山研究总院股份有限公司 | Pile anchor wall reinforcing method for repairing mine maintenance road |
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