Construction technology for huge isolated boulders of alluvial granite in diaphragm wall construction

Abstract

The invention discloses a construction technology for huge isolated boulders of an alluvial granite in diaphragm wall construction. The technology comprises the steps of drilling preparation, drillingdevice selection, hole diameter determination, advanced coaxial drilling, geological exploration and isolated boulder accurate blasting. According to the blasting design of the technology steps, accurate positioning and blasting of large isolated boulders can be realized, and meanwhile, full-section micro-explosive quantity micro-explosion treatment is carried out on smaller isolated boulders ina covering layer. According to the construction technology for the huge isolated boulders of the alluvial granite in diaphragm wall construction, the drilling precision is strictly controlled during drilling, and the stratum condition is recorded and analyzed in detail; aiming at different stratums, differential explosive configuration is adopted, meanwhile, accurate positioning is carried out onthe positions of the large isolated boulders, thus the used explosive amount is reduced and the explosive string manufacturing time is shortened, the construction period is saved, construction cost isreduced, unnecessary disturbance on the original stratum is avoided to the maximum extent in the meanwhile, and a guarantee for the stability of the construction of diaphragm wall slotted holes in the later stage.

Description

technical field [0001] The invention belongs to the technical field of construction of water conservancy and hydropower projects, in particular to the technical field of construction of high cut-off walls in water conservancy and hydropower projects, and specifically relates to a construction technology for alluvial granite giant solitary boulders in the construction of cut-off walls. Background technique [0002] In water conservancy and hydropower projects, the anti-seepage wall as the basic anti-seepage treatment method has been widely used. Randomly distributed solitary boulders are often encountered in the construction of the anti-seepage wall. The internal conditions are complex, and it is difficult to penetrate the solitary boulder to form a hole. In this type of formation, the drilling efficiency is low, the life of the drill tool is short, and accidents such as drill sticking, inclined hole, drill bit drop, and hole collapse are easy to occur. The speed is slow, whi...

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Problems solved by technology

[0004] The traditional "drilling method" and "heavy hammer method" are more practical to deal with large solitary boulders of general lithology, but the construction efficiency is low and the drilling tool wears quickly for high-strength granite boulders. , Hole inclination is difficult to control; conventional boulder pre-blasting construction technology generally adopts full-hole charge blasting method, which greatly disturbs the ground, easily creates new loose overhead layers, and increases the risk of trenching construction of the cut-off wall. The "underwater drilling and blasting" and "in-hole directional energy-gathering blasting" and other methods used in the construction process are difficult to locate the drilling hole, and the explosives are not installed in place, and the blasting in the groove is easy to disturb the hole wall of the impervious wall , it is very easy to cause a hole collapse and a slurry leakage accident

Affected by the handling of accidents, it is difficult to guarantee the construction period

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