CN102877850A - Construction method of weak structural surface displacement of grotto surrounding rocks of underground power plant - Google Patents
Construction method of weak structural surface displacement of grotto surrounding rocks of underground power plant Download PDFInfo
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- CN102877850A CN102877850A CN2012103945530A CN201210394553A CN102877850A CN 102877850 A CN102877850 A CN 102877850A CN 2012103945530 A CN2012103945530 A CN 2012103945530A CN 201210394553 A CN201210394553 A CN 201210394553A CN 102877850 A CN102877850 A CN 102877850A
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Abstract
The invention relates to a construction method of weak structural surface displacement of grotto surrounding rocks of an underground power plant, and aims to provide a construction method of weak structural surface displacement of grotto surrounding rocks of an underground power plant so as to reduce the influences of a weak structural surface in rocks on grotto deformation. The technical scheme provided by the invention is as follows: a. excavating a construction channel along the weak structural surface before an underground plant grotto is excavated or is excavated until the weak structural surface of the surrounding rocks is exposed; b. excavating a pre-displaced branch grotto and a construction branch grotto to the weak structural surface by utilizinig the construction channel; c. excavating a pre-displaced grotto along the weak structural surface; d. refilling and grouting concrete sub sections for the pre-displaced grotto; e. refilling concrete and grouting for the pre-displaced branch grotto and the construction branch grotto by utilizing the construction channel; and f. refilling concrete for the construction channel and the part positioned at the outer side of a side wall. The construction method of weak structural surface displacement of grotto surrounding rocks of the underground power plant provided by the invention is suitable for the pre-displacement treatment on the weak structural surface of grotto surrounding rocks of the underground plant.
Description
Technical field
The present invention relates to the job practices of the weak structural plane displacement of a kind of Underground Hydro-electric Power Station country rock, mainly be applicable to the weak structural plane pre-permutation of Underground Powerhouse and process.
Background technology
Underground power house is a kind of factory building pattern that often adopts in the power station in the rock mass of below ground.Along with the develop rapidly of in recent years Hydraulic and Hydro-Power Engineering construction, the scale of underground chamber is increasing, and the underground power house cavern length of domestic large-scale power station reaches 400 meters, and width reaches more than 30 meters, highly nearly 100 meters.When the underground chamber size is larger, tend to run into the weak structural plane in the rock mass.Weak structural plane has destroyed the globality of rock mass, when the exposure of the position such as high side wall of underground chamber, can cause abutment wall large deformation and shear strain (weak structural plane is out of shape up and down inconsistent), as shown in Figure 1, have a strong impact on stability and the safety of underground chamber, all be new challenge to engineering design and construction, sometimes even cause to build large underground hole.
Summary of the invention
The technical problem to be solved in the present invention is: the job practices that the weak structural plane displacement of a kind of Underground Hydro-electric Power Station country rock is provided for the problem of above-mentioned existence, with the impact that the weak structural plane that reduces in the rock mass is out of shape the cavern, guarantee the stable and safety of underground rock cavern.
The technical solution adopted in the present invention is: the job practices of the weak structural plane displacement of a kind of Underground Hydro-electric Power Station country rock is characterized in that step is as follows:
Before a, the underground power house cavern excavation or before being excavated to the weak structural plane exposure of country rock, along weak structural plane excavation construction passage, the abutment wall of close weak structural plane one side in cavern passes this construction passage and it is divided into two parts;
B, utilization construction passage excavate one group of pre-permutation to weak structural plane one side and prop up a double construction hole, hole;
C, utilization construction passage and pre-permutation are propped up a double construction hole, hole, excavate the pre-permutation hole along weak structural plane;
D, utilization construction passage and pre-permutation are propped up a double construction hole, hole, and also grouting of concrete segmentation backfill is carried out in the pre-permutation hole;
E, utilization construction passage prop up a double construction hole, hole to pre-permutation and carry out also grouting of concrete backfill;
F, construction passage, the part that is positioned at the described abutment wall outside are carried out concrete backfill get final product.
Described construction passage and pre-permutation hole all are parallel to cavern's axis arranged.
Described pre-permutation is propped up the hole and is held concurrently a construction hole perpendicular to construction passage and pre-permutation hole.
The invention has the beneficial effects as follows: for exposure position and the geological condition of the weak structural plane of underground power house cavern abutment wall country rock, prop up a double construction hole, hole by excavation construction passage, pre-permutation hole and pre-permutation, then it is carried out concrete backfill, to realize the pre-permutation of weak structural plane, thereby effectively reduced the impact that weak structural plane is out of shape the cavern in the rock mass, guaranteed the stable and safety of underground rock cavern, made and build Large Underground under the complex geological condition and become feasible scheme.
Description of drawings
Fig. 1 is the structural representation of background technology of the present invention.
Fig. 2 is structural representation of the present invention.
Fig. 3 is that the A-A of Fig. 2 is to sectional view.
The specific embodiment
Such as Fig. 2, shown in Figure 3, the present embodiment construction sequence is as follows:
A, before underground power house cavern 1 excavation or before being excavated to weak structural plane 2 exposures of country rock, utilize existing passage 3, in the cavern abutment wall 1-1 position of 1 close weak structural plane 2 one sides, along weak structural plane 2 excavation construction passages 4; The cross dimensions of this construction passage should satisfy construction requirement, and after guaranteeing that excavation is finished, pass this construction passage and it be divided into two parts near the abutment wall 1-1 of weak structural plane 2 one sides cavern 1, aforementioned abutment wall 1-1 be cavern 1 excavate finish after formed side body of wall.
B, utilization construction passage 4 excavate one group of pre-permutation to weak structural plane 2 one sides and prop up a double construction hole 6, hole, and each pre-permutation is propped up the hole and is held concurrently a construction hole 6 all perpendicular to construction passage 4, its cross dimensions should satisfy displacement and construction requirement, and position and quantity are determined according to geological condition and construction needs.
C, utilize construction passage 4 and pre-permutation to prop up the construction hole 6 of holding concurrently, hole, with a certain distance from the position of abutment wall 1-1, along weak structural plane 2 excavation pre-permutation holes 5; Described construction passage 4 and pre-permutation hole 5 all are parallel to cavern's 1 axis arranged; The position in described pre-permutation hole 5 is determined along weak structural plane shear strain according to the abutment wall that calculates.
D, utilization construction passage 4 and pre-permutation are propped up a double construction hole 6, hole, also grouting of concrete segmentation backfill are carried out in pre-permutation hole 5, to improve the stability of pre-permutation hole 5 surrounding rock bodies; Simultaneously owing to adopt the mode of segmentation backfill, thereby shortened the duration of pre-permutation hole 5 concrete backfills construction.
E, utilization construction passage 4 prop up a double construction hole 6, hole to pre-permutation and carry out also grouting of concrete backfill, the stability of propping up double construction hole 6 surrounding rock body in hole to improve pre-permutation.
F, to the construction passage 4 carry out the pre-permutation that local concrete backfill can be finished weak structural plane 2, namely construction passage 4, the part (being positioned at abutment wall near pre-permutation hole one side) that is positioned at the described abutment wall 1-1 outside are carried out concrete backfill, after construction is finished equipment and personnel from construction passage 4 not backfill partly reach existing passage 3 and withdraw from, the excavation that adopts at last conventional method to carry out cavern 1 gets final product.
Claims (3)
1. the job practices of the weak structural plane displacement of a Underground Hydro-electric Power Station country rock is characterized in that step is as follows:
Before a, underground power house cavern (1) excavation or before being excavated to weak structural plane (2) exposure of country rock, along weak structural plane (2) excavation construction passage (4), cavern (1) is passed this construction passage and it is divided into two parts near the abutment wall of weak structural plane (2) one sides;
B, utilization construction passage (4) excavate one group of pre-permutation to weak structural plane (2) one sides and prop up a double construction hole (6), hole;
C, utilization construction passage (4) and pre-permutation are propped up a double construction hole (6), hole, excavate pre-permutation hole (5) along weak structural plane (2);
D, utilization construction passage (4) and pre-permutation are propped up a double construction hole (6), hole, and pre-permutation hole (5) are carried out also grouting of concrete segmentation backfill;
E, utilization construction passage (4) prop up a double construction hole (6), hole to pre-permutation and carry out also grouting of concrete backfill;
F, construction passage (4), the part that is positioned at the described abutment wall outside are carried out concrete backfill get final product.
2. the job practices of the weak structural plane displacement of Underground Hydro-electric Power Station country rock according to claim 1, it is characterized in that: described construction passage (4) and pre-permutation hole (5) all are parallel to cavern (1) axis arranged.
3. the job practices of the weak structural plane displacement of Underground Hydro-electric Power Station country rock according to claim 1 and 2, it is characterized in that: described pre-permutation is propped up the hole and is held concurrently a construction hole (6) perpendicular to construction passage (4) and pre-permutation hole (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210394553.0A CN102877850B (en) | 2012-10-17 | 2012-10-17 | Construction method of weak structural surface displacement of grotto surrounding rocks of underground power plant |
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| CN201210394553.0A CN102877850B (en) | 2012-10-17 | 2012-10-17 | Construction method of weak structural surface displacement of grotto surrounding rocks of underground power plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191196A (en) * | 2017-07-12 | 2017-09-22 | 中国电建集团华东勘测设计研究院有限公司 | Through the anti-skidding shearing resistance administration structure of the inter-laminar dislocation band of great burying underground chamber and construction method |
| CN110344430A (en) * | 2019-08-01 | 2019-10-18 | 黄河勘测规划设计研究院有限公司 | The buried weak intercalated layer processing method of nearly horizontal distribution in Dam Foundation Rock |
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| JPH01182498A (en) * | 1988-01-18 | 1989-07-20 | Fujita Corp | Cut-off method for tail part in cast-in-place concrete lining process |
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2012
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| JPH01182498A (en) * | 1988-01-18 | 1989-07-20 | Fujita Corp | Cut-off method for tail part in cast-in-place concrete lining process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107191196A (en) * | 2017-07-12 | 2017-09-22 | 中国电建集团华东勘测设计研究院有限公司 | Through the anti-skidding shearing resistance administration structure of the inter-laminar dislocation band of great burying underground chamber and construction method |
| CN110344430A (en) * | 2019-08-01 | 2019-10-18 | 黄河勘测规划设计研究院有限公司 | The buried weak intercalated layer processing method of nearly horizontal distribution in Dam Foundation Rock |
| CN110344430B (en) * | 2019-08-01 | 2021-04-23 | 黄河勘测规划设计研究院有限公司 | Method for processing deep-buried weak interlayer distributed nearly horizontally in dam foundation rock mass |
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| CN102877850B (en) | 2014-12-10 |
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