CN103267455B - Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom - Google Patents

Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom Download PDF

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Publication number
CN103267455B
CN103267455B CN201310170450.0A CN201310170450A CN103267455B CN 103267455 B CN103267455 B CN 103267455B CN 201310170450 A CN201310170450 A CN 201310170450A CN 103267455 B CN103267455 B CN 103267455B
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CN
China
Prior art keywords
hole
big gun
energy dissipating
dam foundation
gun hole
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CN201310170450.0A
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Chinese (zh)
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CN103267455A (en
Inventor
卢文波
胡英国
陈明
胡浩然
朱强
严鹏
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武汉大学
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Priority to CN201310170450.0A priority Critical patent/CN103267455B/en
Publication of CN103267455A publication Critical patent/CN103267455A/en
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Publication of CN103267455B publication Critical patent/CN103267455B/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D1/00Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D3/00Particular applications of blasting techniques
    • F42D3/04Particular applications of blasting techniques for rock blasting
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42DBLASTING
    • F42D1/00Blasting methods or apparatus, e.g. loading or tamping
    • F42D1/08Tamping methods; Methods for loading boreholes with explosives; Apparatus therefor
    • F42D1/18Plugs for boreholes

Abstract

The invention discloses a dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of a blast hole bottom. The method includes the steps that 1 a row of collinear vertical blast holes are drilled in a rock body; 2 a buffer layer is paved at the blast hole bottom and is made of cut sand, rock powder or fine sand; 3 a rope is used for dragging a conical energy dissipation base into a blast hole, and the bottom face of the conical energy dissipation base is arranged on the buffer layer; and 4 powder is added into the blast hole, the blast hole is plugged, and the powder is ignited. The dam foundation one-step forming drilling blasting method is applicable to one-step forming of excavation of a dam foundation surface and a slope packway protective layer and has the advantages of being simple in process, low in cost, good in excavation effect and the like.

Description

In conjunction with the dam foundation one-shot forming drillhole blasting method of energy dissipating and cumulative at the bottom of hole, big gun hole
Technical field
The invention belongs to engineering explosion technical field, particularly a kind of dam foundation excavation one-shot forming drillhole blasting technology adopting energy dissipating at the bottom of hole and cumulative to combine.
Background technology
The foundation plane of hydroelectric project, side slope packway protective layer excavation quality are the difficult points in Construction of Hydropower Engineering always.In prior art, traditional Long-hole Bench Blasting, efficiency of construction is often very low, and larger to the damage retaining rock mass at the bottom of hole; Horizontal presplit or horizontal photoface exploision, excavation effect is still good, but efficiency of construction still cannot be satisfactory.To establish between the little bench hole of flexible cushion order to detonate method at the bottom of hole in recent years, because the cushioning effect of flexible cushion material to Blasting shock wave is limited, damage at the bottom of hole is still comparatively large, and the foundation plane excavated out the difference that rises and falls is comparatively large, thus causes artificial prying amount larger; Adopt the common CUMULATIVE BLASTING of wedge shape medicine groove simultaneously, due to device cumulative limited efficiency, also cannot obtain desired result.How to control the excavation quality that Dam Base Surface, side slope packway are shaping, the efficiency improving bursting work is still current urgent problem.
Summary of the invention
Excavation quality for Dam Base Surface in prior art and side slope packway protective layer is difficult to the deficiency ensured, the invention provides a kind of dam foundation one-shot forming drillhole blasting method in conjunction with energy dissipating and cumulative at the bottom of hole, big gun hole that technique is simple, workable, reduce damage at the bottom of hole, big gun hole, strengthen blasting efficiency.
In order to solve the problems of the technologies described above, the present invention adopts following technical scheme:
In conjunction with a dam foundation one-shot forming drillhole blasting method for energy dissipating and cumulative at the bottom of hole, big gun hole, comprise step:
Step 1, is drilled with the vertical hole in a row of center of circle conllinear in rock mass;
Step 2, at the bottom of hole, big gun hole, lay cushion, described cushion is the fluffing of moulding sand, rock dust or fine sand;
Step 3, adopts rope that conical energy dissipating seat traction is entered big gun hole, and makes its bottom surface be placed on cushion;
Step 4, adds medicinal powder and ignites medicinal powder after blocking in big gun hole.
In order to strengthen the reflection cumulative effect of the inventive method further, the present invention can adopt following preferred version:
(1) buffer layer thickness is 10 ~ 20cm, and in each big gun hole, buffer layer thickness is identical.
(2) cushion is the fluffing of moulding sand.
(3) element of cone of conical energy dissipating seat and bottom surface are 45° angle degree, and the basal diameter of conical energy dissipating seat be the 0-8 ~ 0-9 in blast hole aperture doubly.
(4) conical energy dissipating seat can adopt cast iron, core or concrete to prepare, and described core can be granite core or parent rock core.
Fig. 3 is for igniting forward gun hole sectional view, and Fig. 4 ignites after-explosion to impact the propagation schematic diagram in big gun hole, and Fig. 5 is the cumulative effect schematic diagram of horizontal direction Explosive stress wave at the bottom of big gun hole.See Fig. 3 ~ 4, after ignition, after the blast impulse 6 that vertical direction at the bottom of Zhong Xiangbao hole, big gun hole is propagated runs into the energy dissipating seat at the bottom of hole, energy dissipating seat side occurs reflection and refraction.In a preferred approach, the material behavior (characteristic of cast iron materials) special due to energy dissipating seat and space structure (that is, the side of energy dissipating seat and ground are miter angle), propagate induced explosion energy to horizontal direction at the bottom of hole.Because the fragmentation of energy dissipating seat and cushion and explosion wave are in the multiple reflections of different materials dielectric boundaries and refraction, the explosion energy that vertical direction at the bottom of hole is propagated will be consumed further, damage at the bottom of reduction holes.For the blast hole in a row in dam foundation excavation, the interaction of adjacent shot hole, by strengthening the cumulative effect of horizontal direction at the bottom of hole, big gun hole, is shown in Fig. 5, is realizing reducing while rock crushing between big gun hole rising and falling poor, thus is ensureing the one-shot forming that foundation plane excavates.
Compared with prior art, the present invention has following features and beneficial effect:
(1) present invention process is easy, with low cost, is easy to operation, can directly utilizes the rig of job site to be drilled with veritcal shooting hole.
(2) due to the reflection cumulative action of cushion and energy dissipating seat; excavation effect is reliable; the one-shot forming of Dam Base Surface and side slope packway protective layer excavation can be ensured, be widely used in Hydraulic and Hydro-Power Engineering, traffic, the foundation plane of industry in mine and slope protection layer excavation project.
Accompanying drawing explanation
Fig. 1 is the steel for shot schematic diagram in the present invention;
Fig. 2 is the schematic diagram that energy dissipating in the present invention and cumulative combine;
Fig. 3 is single big gun hole enlarged diagram;
Fig. 4 is the propagation schematic diagram of blast impulse in big gun hole;
Fig. 5 is the cumulative effect schematic diagram of horizontal direction Explosive stress wave at the bottom of big gun hole.
In figure: 1-blocks section, 2-explosive, 3-energy dissipating seat, 4-cushion, 5-rock mass, the blast impulse that 6-vertical direction is propagated, the blast impulse that 7-horizontal direction is propagated, the 8-explosion zone of influence.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be described further.
In this concrete enforcement, the rock matter foundation excavation degree of depth of excavation to be blasted is 8m, and conical energy dissipating seat adopts the preparation of granite core, and cushioning layer material is the dry fluffing of moulding sand.
This concrete dam foundation one-shot forming drillhole blasting method implemented is carried out successively according to the following steps:
1, in rock mass, be drilled with the vertical hole in a row of center of circle conllinear:
In the rock matter basis of excavation to be blasted, the position of Reasonable Arrangement vertical hole and size, be shown in Fig. 1: big gun hole aperture 90mm, big gun hole depth 8.5m, big gun hole ultra-deep 0.5m, and blocking segment length 2m, borehole spacing is 3m.
2, cushion is laid:
After having holed, at the bottom of each hole, even laying depth is the cushion of 20cm.
3, energy dissipating seat is placed on cushion:
This is concrete implement in need the energy dissipating seat shape adopted to be: circle element of a cone and bottom surface are miter angle, and basal diameter is 85mm.According to above-mentioned form parameter, adopt the conical energy dissipating seat of granite core material processing preparation, prepared energy dissipating seat can be solid or hollow.
With nylon rope, the binding of energy dissipating seat is fastened, by nylon rope energy dissipating seat slowly drawn and enter big gun hole, and its bottom surface is settled on the buffer layer.
4, powder charge and detonating:
In big gun hole, load the powder stick that diameter is 70mm, powder stick length is 6m, and emulsion selected by explosive.After powder charge completes, clay or sandbag is adopted to block big gun hole.Block complete, after confirming safety, by the explosive in cap sensitive big gun hole.

Claims (5)

1., in conjunction with a dam foundation one-shot forming drillhole blasting method for energy dissipating and cumulative at the bottom of hole, big gun hole, it is characterized in that, comprise step:
Step 1, is drilled with the vertical hole in a row of center of circle conllinear in rock mass;
Step 2, at the bottom of hole, big gun hole, lay cushion, described cushion is the fluffing of moulding sand, rock dust or fine sand;
Step 3, adopt rope that the traction of conical, massive energy dissipating seat is entered big gun hole, and make its bottom surface be placed on cushion, described conical energy dissipating seat adopts the preparation of cast iron, core or concrete, its bus and bottom surface are 45° angle degree, and its basal diameter is 0.8 ~ 0.9 times of blast hole aperture;
Step 4, adds medicinal powder and ignites medicinal powder after blocking in big gun hole.
2., as claimed in claim 1 in conjunction with the dam foundation one-shot forming drillhole blasting method of energy dissipating and cumulative at the bottom of hole, big gun hole, it is characterized in that:
Described buffer layer thickness is 10 ~ 20cm.
3., as claimed in claim 1 in conjunction with the dam foundation one-shot forming drillhole blasting method of energy dissipating and cumulative at the bottom of hole, big gun hole, it is characterized in that:
The buffer layer thickness laid in each big gun hole is identical.
4., as claimed in claim 1 in conjunction with the dam foundation one-shot forming drillhole blasting method of energy dissipating and cumulative at the bottom of hole, big gun hole, it is characterized in that:
Described cushion is the fluffing of moulding sand.
5., as claimed in claim 1 in conjunction with the dam foundation one-shot forming drillhole blasting method of energy dissipating and cumulative at the bottom of hole, big gun hole, it is characterized in that:
Described core is granite core or parent rock core.
CN201310170450.0A 2013-05-10 2013-05-10 Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom CN103267455B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310170450.0A CN103267455B (en) 2013-05-10 2013-05-10 Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310170450.0A CN103267455B (en) 2013-05-10 2013-05-10 Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom
PCT/CN2013/086107 WO2014180101A1 (en) 2013-05-10 2013-10-29 Cushion blasting method combining hole bottom damage control and fast excavation

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CN103267455A CN103267455A (en) 2013-08-28
CN103267455B true CN103267455B (en) 2015-04-01

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Publication number Priority date Publication date Assignee Title
CN103267455B (en) * 2013-05-10 2015-04-01 武汉大学 Dam foundation one-step forming drilling blasting method by combining energy dissipation and energy collection of blast hole bottom
CN103968721B (en) * 2014-05-26 2015-07-15 武汉大学 Hole bottom energy gathering and dissipating device suitable for inclined blast hole and capable of improving blasting excavation flatness of foundation surface
CN104215137A (en) * 2014-09-28 2014-12-17 武汉大学 Method for blasting and excavating dam foundation and rock foundation
CN104446168A (en) * 2014-10-23 2015-03-25 武汉大学 High-wave impedance concrete as well as preparation method and application thereof
CN104654941B (en) * 2015-03-02 2016-03-30 武汉大学 A kind of dam foundation Rapid Excavation explosive forming method based on explosives mix-load truck
RU2594236C1 (en) * 2015-05-27 2016-08-10 Федеральное государственное бюджетное учреждение науки ИНСТИТУТ ПРОБЛЕМ КОМПЛЕКСНОГО ОСВОЕНИЯ НЕДР РОССИЙСКОЙ АКАДЕМИИ НАУК (ИПКОН РАН) Method for explosive destruction of various coherence rock massif with distributed and shortened blasthole charges with cumulative effect
CN105135959A (en) * 2015-08-21 2015-12-09 武汉大学 Hole bottom air interval gathering-energy dissipating device and installing and using method thereof
CN105258582B (en) * 2015-11-05 2017-06-23 中国水利水电第十六工程局有限公司 A kind of explosive column and excavation technology smooth for foundation plane Blasting Excavation
CN105605995A (en) * 2016-01-25 2016-05-25 广东爆破工程有限公司 Slow slope rock blasting and excavating method
CN105526834A (en) * 2016-02-29 2016-04-27 武汉大学 Construction method of blasthole stemming structure for drilling blasting and concrete block structure for method
CN106949797B (en) * 2017-03-27 2018-08-10 武汉大学 The moulding composite spherical energy-dissipating structure of impact for vertical holes explosion
CN111102893B (en) * 2020-01-07 2020-12-01 武汉大学 Conical energy regulating and controlling device and curved surface foundation vertical hole blasting excavation method based on same

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