CN219261020U - Pre-consolidation grouting system for top arch and side wall of large underground tunnel - Google Patents
Pre-consolidation grouting system for top arch and side wall of large underground tunnel Download PDFInfo
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- CN219261020U CN219261020U CN202223089049.8U CN202223089049U CN219261020U CN 219261020 U CN219261020 U CN 219261020U CN 202223089049 U CN202223089049 U CN 202223089049U CN 219261020 U CN219261020 U CN 219261020U
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Abstract
The utility model provides a pre-consolidation grouting system for a top arch and a side wall of a large underground cavity, wherein a top arch and a first-order pre-consolidation grouting hole of the end wall are drilled on the top arch of a factory building through a grouting gallery, grouting sections of the top arch and the first-order pre-consolidation grouting hole of the end wall are pre-consolidated and grouted through the top arch and the first-order pre-consolidation grouting hole of the end wall, non-grouting sections of the top arch and the first-order pre-consolidation grouting hole of the end wall are backfilled through the top arch and the first-order pre-grouting hole of the end wall, a top arch and a second-order pre-consolidation grouting hole of the end wall are drilled on the top arch of the factory building through the grouting gallery, grouting sections of the top arch and the second-order pre-consolidation grouting hole of the end wall are pre-consolidated and grouted through the top arch and the second-order pre-consolidation grouting hole of the end wall; through the pre-consolidation grouting of the top arch and the end wall, the integrity of surrounding rock is effectively improved before the top arch and the end wall are excavated, and the stability of the surrounding rock is effectively improved.
Description
Technical Field
The utility model relates to a pre-consolidation grouting system for a top arch and a side wall of a large underground cavity.
Background
In large underground projects such as hydroelectric projects and mining projects, main projects are usually large in scale, have burial depths and spans of hundreds of meters, and face complex geological conditions, so that the technical difficulty and the danger of the projects are greatly increased. If the roof arch and the end wall surrounding rock are broken, collapse is very likely to happen after excavation, and the construction difficulty of main engineering and the safe and stable operation in the later stage are greatly influenced.
At present, the top arch and the end wall surrounding rock of the underground factory building are reinforced, consolidation grouting is usually carried out after excavation, the risk of instability of the surrounding rock is higher until the system is anchored and supported after excavation, grouting pressure is small, grouting hole spacing is larger, and the surrounding rock reinforcing effect is difficult to achieve. However, the method has limitation on large-scale underground engineering with deeper burial depth, especially poor geological conditions such as karst and the like, and surrounding rock is broken. In order to effectively strengthen the top arch and the end wall of the underground factory building before excavation, improve the pre-consolidation grouting pressure, encrypt the pre-consolidation grouting hole spacing, improve the integrity of surrounding rock before excavation, and need to take necessary engineering measures, in particular to carry out reliable pre-consolidation grouting.
Disclosure of Invention
The utility model aims to solve the problems, and provides a pre-consolidation grouting system for a top arch and a side wall of a large underground cavity, which can effectively strengthen surrounding rock before excavation of the top arch and the side wall of an underground factory, and improve the integrity of the surrounding rock before excavation.
For this purpose, the above object of the present utility model is achieved by the following technical solutions:
a pre-consolidation grouting system for a top arch and a side wall of a large underground cavity is characterized in that: the pre-consolidation grouting system for the top arch and the side wall of the large underground cavity comprises the top arch and the side wall of the large underground cavity, and grouting galleries are arranged in surrounding rocks above the top arch and the side wall of the large underground cavity; drilling a top arch and a terminal wall one-order pre-consolidation grouting hole and a top arch and a terminal wall two-order pre-consolidation grouting hole in the direction of the top arch of the large underground cavity by the grouting gallery; the top arch and the end wall first-order pre-consolidation grouting holes, the top arch and the end wall second-order pre-consolidation grouting holes are arranged at intervals, and the top arch and the end wall first-order pre-consolidation grouting holes, the top arch and the end wall second-order pre-consolidation grouting holes which are positioned in the same cross section are all in fan-shaped distribution;
the top arch and the end wall are sequentially provided with grouting sections and non-grouting sections in the direction of the top arch of the large underground cavity along the two-order pre-consolidation grouting Kong Ziguan slurry gallery of the top arch and the end wall;
grouting is carried out in the grouting section, and cement mortar is backfilled in the non-grouting section.
The utility model can also adopt or combine the following technical proposal when adopting the technical proposal:
as a preferred technical scheme of the utility model: the grouting gallery is in a straight wall dome shape.
As a preferred technical scheme of the utility model: the grouting gallery is 3 m wide and 4 m tall.
As a preferred technical scheme of the utility model: the aperture of the top arch and end wall sequential pre-consolidation grouting holes is 100 mm.
As a preferred technical scheme of the utility model: the aperture of the top arch and end wall two-order pre-consolidation grouting holes is 100 mm.
As a preferred technical scheme of the utility model: the grouting sections in the top arch and end wall one-order pre-consolidation grouting holes and the top arch and end wall two-order pre-consolidation grouting holes in the top arch range are 15 to m from the top arch excavation line upwards to 1 to m from the top arch excavation line downwards.
As a preferred technical scheme of the utility model: the top arch in the end wall range and the grouting section in the top arch and end wall one-order pre-consolidation grouting holes and the top arch and end wall two-order pre-consolidation grouting holes are 5 m upwards to the junction of the surrounding rock relatively crushing range and the surrounding rock range from the top arch excavation line.
As a preferred technical scheme of the utility model: the spacing between the adjacent two top arches and end walls in the grouting gallery and the first-order pre-consolidation grouting holes of the top arches and end walls is 6 m, and the spacing between the first-order pre-consolidation grouting holes of the top arches and end walls and the adjacent two top arches and end walls is 3 m.
The utility model provides a pre-consolidation grouting system for a top arch and a side wall of a large underground cavity, wherein a top arch and a first-order pre-consolidation grouting hole of the end wall are drilled on the top arch of a factory building through a grouting gallery, grouting sections of the top arch and the first-order pre-consolidation grouting hole of the end wall are pre-consolidated and grouted through the top arch and the first-order pre-consolidation grouting hole of the end wall, non-grouting sections of the top arch and the first-order pre-consolidation grouting hole of the end wall are backfilled through the top arch and the first-order pre-grouting hole of the end wall, a top arch and a second-order pre-consolidation grouting hole of the end wall are drilled on the top arch of the factory building through the grouting gallery, grouting sections of the top arch and the second-order pre-consolidation grouting hole of the end wall are pre-consolidated and grouted through the top arch and the second-order pre-consolidation grouting hole of the end wall; through the pre-consolidation grouting of the top arch and the end wall, the integrity of surrounding rock is effectively improved before the top arch and the end wall are excavated, the stability of the surrounding rock is effectively improved, and important guarantee measures are provided for the safety construction and operation of underground engineering. Specifically, the method has the following beneficial effects:
(1) By pre-solidifying and grouting the top arch and the end wall before excavating, the integrity of surrounding rock is effectively improved, the stability of the surrounding rock is effectively improved, and important guarantee measures are provided for the safety construction and operation of underground engineering.
(2) The pre-consolidation grouting is carried out on surrounding rocks of the factory building before excavation, the pre-consolidation grouting pressure can be increased, the pre-consolidation grouting holes are arranged in a multi-row fan-shaped mode, the grouting hole spacing is effectively increased, the pre-consolidation grouting effect is greatly improved, and the stability of the surrounding rocks of the top arch and the end walls of the underground factory building is greatly improved.
(3) The pre-consolidation grouting system has reasonable design and strong operability, is suitable for projects with poor geological conditions such as roof arch and end wall surrounding rock crushing, and the formed space three-dimensional pre-consolidation grouting system can provide important guarantee measures for underground engineering construction safety and later operation.
Drawings
FIG. 1 is a cross-sectional view of a pre-consolidation grouting system for a roof arch and side walls of a large underground cavern in the range of the roof arch;
FIG. 2 is a cross-sectional view of a pre-consolidation grouting system for a roof arch and side walls of a large underground cavern in the end wall area provided by the utility model;
FIG. 3 is a plan view of the grout Kong Langdao;
in the figure: 1-a top arch and a side wall of a large underground cavern; 2-grouting gallery; 3-pre-concreting grouting holes of the top arch and the end wall in sequence; 4-a grouting section of the top arch and the end wall; 5-a top arch and an end wall are sequentially pre-consolidated grouting hole non-grouting sections; 6-top arch and end wall two-order pre-consolidation grouting holes; 7-a grouting section of a top arch and an end wall two-order pre-consolidation grouting hole; 8-top arch and end wall two-order pre-consolidation grouting hole non-grouting section.
Detailed Description
The utility model will be described in further detail with reference to the drawings and specific embodiments.
A pre-consolidation grouting system for a large underground cavern roof arch and end walls, comprising: the method comprises the steps of a top arch and a terminal wall 1 of an underground factory building, a grouting gallery 2, a top arch and a terminal wall first-order pre-consolidation grouting hole 3, a top arch and a terminal wall first-order pre-consolidation grouting hole grouting section 4, a top arch and a terminal wall first-order pre-consolidation grouting hole non-grouting section 5, a top arch and a terminal wall second-order pre-consolidation grouting hole 6, a top arch and a terminal wall second-order pre-consolidation grouting hole grouting section 7 and a top arch and a terminal wall second-order pre-consolidation grouting hole non-grouting section 8.
The construction grouting gallery 2 is a straight wall dome shape, the size is 3 m multiplied by 4 m (width multiplied by height), and the support is excavated and formed according to actual geological conditions.
Drilling a top arch and an end wall in-order pre-consolidation grouting hole 3 from the grouting gallery to the top arch of the underground plant, wherein the aperture is 100 mm; the hole length is determined according to the distance between the grouting gallery bottom plate and the factory building roof arch excavation line, the hole bottom distance of the roof arch part exceeds the factory building roof arch excavation line 1 m, and the end wall part determines the grouting hole length according to the surrounding rock crushing range; the grouting holes with the same cross section are distributed in a sector shape, and the interval between the pre-consolidation grouting Kong Kongduan with the same cross section in sequence is 6 m; the spacing between two adjacent cross-section grouting holes is 3 m;
grouting is carried out on a top arch and end wall one-sequence pre-consolidation grouting hole grouting section 4, wherein the top arch one-sequence pre-consolidation grouting hole grouting section is 15 to m from the top arch excavation line upwards to 1 to m from the top arch excavation line downwards; the range of the grouting section of the end wall one-order pre-consolidation grouting hole is 5 m upwards from the top arch excavation line to the junction between the relatively broken range of surrounding rock and the relatively good surrounding rock range; the pre-consolidation grouting slurry is common cement slurry, the water-cement ratio is 2:1, 1:1 and 0.5:1 to 3 ratio stages, the grouting ratio is 2:1, and the one-order grouting pressure is 1.0 Mpa.
And (5) in-situ pre-consolidation grouting hole non-grouting sections 5 of the top arch and the end wall, backfilling by adopting cement mortar, and compacting the backfilling. And (5) drilling the two-order pre-consolidation grouting holes after backfilling for 7 days.
Drilling a top arch and an end wall two-sequence pre-consolidation grouting hole 6 from the grouting gallery to the top arch of the underground plant, wherein the aperture is 100 mm; the hole length is determined according to the distance between the grouting gallery bottom plate and the factory building roof arch excavation line, the hole bottom distance of the roof arch part exceeds the factory building roof arch excavation line 1 m, and the end wall part determines the grouting hole length according to the surrounding rock crushing range; the grouting holes with the same cross section are distributed in a fan shape, the interval between the pre-consolidation grouting Kong Kongduan with the same cross section and the grouting holes with the first order is 6 m, i.e. the interval between the grouting holes with the same cross section and the second order and the grouting holes with the first order is 3 m; the spacing between the adjacent two cross-section grouting holes is 3 m.
Grouting is carried out on a top arch and end wall two-sequence pre-consolidation grouting hole grouting section 7, wherein the top arch two-sequence pre-consolidation grouting hole grouting section is 15 to m from the top arch excavation line to 1 to m from the top arch excavation line; the range of the grouting section of the end wall two-sequence pre-consolidation grouting hole is 5 m upwards from the top arch excavation line to the junction between the relatively broken range of surrounding rock and the relatively good surrounding rock range; the pre-consolidation grouting slurry is common cement slurry, the water-cement ratio is 2:1, 1:1 and 0.5:1 to 3 ratio stages, the grouting ratio is 2:1, and the two-order grouting pressure is 1.5 Mpa.
And (3) backfilling the non-grouting sections 8 of the grouting holes by adopting cement mortar in a two-step pre-consolidation manner on the top arch and the end wall, wherein the backfilling is compact.
The above detailed description is intended to illustrate the present utility model by way of example only and not to limit the utility model to the particular embodiments disclosed, but to limit the utility model to the precise embodiments disclosed, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the utility model as defined by the appended claims.
Claims (7)
1. A pre-consolidation grouting system for a top arch and a side wall of a large underground cavity is characterized in that: the pre-consolidation grouting system for the top arch and the side wall of the large underground cavity comprises the top arch and the side wall of the large underground cavity, and grouting galleries are arranged in surrounding rocks above the top arch and the side wall of the large underground cavity; drilling a top arch and a terminal wall one-order pre-consolidation grouting hole and a top arch and a terminal wall two-order pre-consolidation grouting hole in the direction of the top arch of the large underground cavity by the grouting gallery; the top arch and the end wall first-order pre-consolidation grouting holes, the top arch and the end wall second-order pre-consolidation grouting holes are arranged at intervals, and the top arch and the end wall first-order pre-consolidation grouting holes, the top arch and the end wall second-order pre-consolidation grouting holes which are positioned in the same cross section are all in fan-shaped distribution;
the top arch and the end wall are sequentially provided with grouting sections and non-grouting sections in the direction of the top arch of the large underground cavity along the two-order pre-consolidation grouting Kong Ziguan slurry gallery of the top arch and the end wall;
grouting is carried out in the grouting section, and cement mortar is backfilled in the non-grouting section.
2. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern as claimed in claim 1, wherein: the grouting gallery is in a straight wall dome shape.
3. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern according to claim 1 or 2, wherein: the grouting gallery is 3 m wide and 4 m tall.
4. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern as claimed in claim 1, wherein: the aperture of the top arch and end wall sequential pre-consolidation grouting holes is 100 mm.
5. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern as claimed in claim 1, wherein: the aperture of the top arch and end wall two-order pre-consolidation grouting holes is 100 mm.
6. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern as claimed in claim 1, wherein: the grouting sections in the top arch and end wall one-order pre-consolidation grouting holes and the top arch and end wall two-order pre-consolidation grouting holes in the top arch range are 15 to m from the top arch excavation line upwards to 1 to m from the top arch excavation line downwards.
7. The pre-consolidation grouting system for a roof arch and a side wall of a large underground cavern as claimed in claim 1, wherein: the spacing between the adjacent two top arches and end walls in the grouting gallery and the first-order pre-consolidation grouting holes of the top arches and end walls is 6 m, and the spacing between the first-order pre-consolidation grouting holes of the top arches and end walls and the adjacent two top arches and end walls is 3 m.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223089049.8U CN219261020U (en) | 2022-11-21 | 2022-11-21 | Pre-consolidation grouting system for top arch and side wall of large underground tunnel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223089049.8U CN219261020U (en) | 2022-11-21 | 2022-11-21 | Pre-consolidation grouting system for top arch and side wall of large underground tunnel |
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| CN219261020U true CN219261020U (en) | 2023-06-27 |
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| CN202223089049.8U Active CN219261020U (en) | 2022-11-21 | 2022-11-21 | Pre-consolidation grouting system for top arch and side wall of large underground tunnel |
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