Borehole charging method for underwater silt seam disturbance blasting

Abstract

A borehole charging method for underwater silt seam disturbance blasting includes the steps of 1, setting up and fixing a drilling platform; 2, mounting a positioning guide pipe; 3, tripping a steel casing into the positioning guide pipe; 4, drilling a silt seam; 5, drilling to base rock; 6, clearing a borehole and charging a charge casing into the borehole; 7, performing trial charging; 8, charging and marking; 9, fixing cartridges to a charge half pipe segment by segment in sequence; 10, placing the cartridges to the bottom of the borehole segment by segment; 11, checking the number of the cartridges and determining a charge position; 12, making a detonating fuse, a detonator mark and fixing; 13, sealing. The method has the advantages that drilling quality and precision of the silt borehole can be ensured, precise in-place charging can be ensured, quality check and control can be facilitated during the process, disturbance blasting effect of the silt borehole is guaranteed, water around the underground silt borehole is directly used as sealing material to seal space of the underwater silt borehole remaining above the cartridges, manufacturing is not required, cost is low, sealing tightness is good, and sealing quality is guaranteed.

Description

technical field [0001] The invention relates to a method for charging explosives in boreholes, in particular to a method for charging explosives in boreholes for disturbance blasting of underwater mud layers. Background technique [0002] It is generally difficult to drill and charge blastholes for silt disturbance blasting in deep water below the water surface of the reservoir area, and the drilling accuracy is not suitable for control. The quality of the blasting is directly related to the effect of silt disturbance blasting. At present, the methods of digging holes in dry ground and charging blasting or underwater drilling rigs are used to lower steel casings while drilling holes, and then directly charge blasting in the casings. No positioning guide pipes are used during construction, and the deflection rate is difficult to control. Within 0.2%. Direct charge blasting in the casing will cause loss of steel casing, high cost and low reliability. The charge is usually lo...

AI Technical Summary

Problems solved by technology

Direct charge blasting in the casing will cause loss of steel casing, high cost and low reliability. The charge is usually lowered directly or tied to bamboo chips. The charge roll is generally not segmented. For deep blast holes, because It is difficult to complete the charging smoothly due to the long drug roll, resulting in a decline in the quality of the charging

The current technology of plugging generally uses a mixture of yellow mud and sand or sand and rock powder for