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Rock plug blasting method under deep water and thick sediment coverage based on modified blasting action index

A blasting action index, deep water technology, applied in blasting and other directions, to achieve the effect of sufficient theoretical basis, clear calculation steps, and reliable methods

Active Publication Date: 2018-03-16
CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a rock plug blasting method under deep water thick sediment coverage based on the modified blasting action index to solve the problem that the underwater rock plug blasting method with relatively large water depth and sediment coverage is still in a blank state

Method used

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  • Rock plug blasting method under deep water and thick sediment coverage based on modified blasting action index
  • Rock plug blasting method under deep water and thick sediment coverage based on modified blasting action index
  • Rock plug blasting method under deep water and thick sediment coverage based on modified blasting action index

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example 1

[0148] (1) Collection of information

[0149] The water inlet of a certain project was constructed by underwater rock plug blasting. The designed rock plug is in the shape of an inverted truncated cone, the upper opening is approximately elliptical, the size is 21.60m×20.98m, and the diameter of the lower opening circle is 10m. The rock plug is 54.5m below the water depth, and the sediment overburden is 24.5m thick. The rock at the rock plug is mica-quartz schist, mainly weakly weathered rock, with a small amount of slightly weathered rock, the rock strength is relatively high, the average saturated compressive strength of rock is 60.MPa, and the average saturated density is 2820kg / m 3 , is a hard rock with relatively complete rocks, belonging to Type II rocks (classified according to 16 grades, which is equivalent to 10 grades). Measured from the 1:200 topographic map, the terrain slope is 40°~60°;

[0150] The rock plug blasting uses high-energy emulsion explosives and ele...

example 2

[0194] (1) Collection of information

[0195] An on-site rock plug blasting test was carried out in a certain project. According to the 1:200 geological survey results, the rock mass slope at the entrance section is steep, the rock face line along the plug mouth is uneven, the rock face line is complex, and the slope is generally 75°-85°. It is quartz mica schist and mica quartz schist, and the average saturated density of rock is 2900kg / m 3 , the rock is hard, the rock is weak to slightly weathered, the integrity of the surface rock is poor, and no weak structural planes that are not conducive to the stability of the rock plug have been found. The water depth above the plug body is 59m, and the depth of the overlying sediment layer on the rock plug body is 29m. The inner opening of the rock plug is designed to be circular, with an inner diameter of 7m and an outer opening size of 11.96×12.63m, which is approximately elliptical. The minimum thickness of the rock plug is 9.80m...

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Abstract

The invention relates to a deep-water thick-sediment covering rock plug blasting method based on corrected blasting effect indexes, and belongs to the field of hydraulic and hydropower engineering. The method comprises the steps that data are collected; presplit holes are drilled in the periphery of a rock plug; the plug body rock unit explosive consumption is determined; arrangement of explosive chambers is conducted, and the blasting initiation sequence is determined; the minimum resistance line of the blasting explosive chambers is determined; land blasting effect index values are selected; the explosive chamber separation distance is rechecked; the underwater silt covering blasting effect index value is determined; the explosive quantity of explosive chambers is calculated; and interconnection plugging blasting is conducted. The deep-water thick-sediment covering rock plug blasting method based on the corrected blasting effect indexes has the advantages that the theoretical basis is sufficient, the calculation steps are clear, the method is reliable, a large number of scientific research tests of engineering problems of the same kind are avoided, and the technical problem that deep-water thick-sediment covering rock plug blasting is difficult is solved.

Description

technical field [0001] The invention relates to the field of water conservancy and hydropower engineering, in particular to an underwater rock plug blasting method in deep water and thick sediment coverage, which is suitable for rock plug blasting projects at water inlets under the conditions of high water head and thick sediment coverage. Background technique [0002] Underwater rock plug blasting is an underwater controlled blasting technology. When water intake, power generation, irrigation water supply and flood discharge are carried out in built reservoirs or natural lakes, rock plugs are used to construct water intakes of tunnels and avoid building cofferdams in deep water. Blasting is an economical and effective method. [0003] Due to the thick underwater siltation or covering of some reservoirs or lakes, the difficulty of underwater rock plug blasting using cavern blasting at water intakes is greatly increased. It is a brand-new topic, and there is neither mature e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F42D3/04F42D1/00
CPCF42D1/00F42D3/04
Inventor 金正浩马军王鹤苏加林王福运高垠姜殿成齐志坚张雨豪王科峰王德库朱奎卫蔡云波田作印韩立阳史有富冯吉新刘牧冲于长征王富强刘成浩马瑀泽于淼潘永庆
Owner CHINA WATER NORTHEASTERN INVESTIGATION DESIGN & RES
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