Research And Application On The Technology Of One-expanding Deep-hole Blasting

Raise has a very wide range of applications, for instance, in military and civil engineering. In mining production, raise driving engineering is one of the most difficult part. The traditional method of raising has large labor intensity, poor working conditions, high dustconcentration and low security. Deep-hole blasting driving raise is a kind of blasting technology developed in the 1950s, according to the different method of blasting, deep-hole blasting driving raise can be divided into one-blasting deep-hole well and segmented deep-hole blasting, its essence is in accordance with the raise section size arranging holes, and along the raise’s high drill a set of parallel hole bottom-up or top-down, then, according to the height of raise, one or more sections of blasting. The method avoids faults of the traditional methods, but the blasting construction is difficult.The essence of one-expanding deep-hole blasting is to use artificial methods or boring patio drill a small section of the raise, and then along the sides of the raise or its’part drill a group of parallel hole, according to the stage height, one or more times blasting. The well has been drilled provides initial free surface and compensation space for the subsequent explosion expanding well. Compared with other blasting methods, guide shaft can provide more compensation space, and is conducive to improve the blasting effect and quality of well. Based on the geological conditions of Jinchanggouliang Gold Deposit, and combined with engineering project, carried out the research on the technology of one-expanding deep-hole blasting of Jinchanggouliang Gold Deposit.First of all, analyzed the rock blasting process. Based on analysis of rock breaking mechanism, blasting stress wave produced in rock formation, propagation and attenuation process, and fracture criterion of rock blasting and calculation of blasting fracture zone, and demonstrated the feasibility of one-expanding deep-hole blasting in theory.Secondly, combining with the geological characteristics of Jinchanggouliang gold mine and the well location conditions, putted forward five expanding well schemes, and through analysis and comparison of various schemes, choosed optimal scheme which is not only feasible in technology, but also rational in economy.Finally, taking Inner Mongolia Jintao company Jinchanggouliang Gold deposit as the basis, and experimented with one-expanding deep-hole blasting three times. The non-coupling coefficient of the first extension of well test is 1.2 (hole diameter is 60mm, cartridge diameter is 50mm), as well as the effect is good, at the same time reached the expanding raise requirements basically; The non-coupling coefficient of the second and third extension of well test are 1.43 (hole diameter is 100mm, cartridge diameter is 70mm), the two tests produced different conditions, and finally the raises were blocked.In the third experiment, the number of land 4 hole blasting, cleared rock slag, used the 3D goaf scanner to scanning the blasting effect. In the three-dimensional laser scanning results view, upper section area of pilot shaft was 1.22m2, removed the data that not high in credibility (Section 10 later), the middle part of section area was 2.37m2, section 7 of the section area was 3.06m2.Through the above theoretical research and design, provided a theoretical basis for one-expanding deep-hole blasting of Jinchanggouliang Gold deposit, combined with the experiment results, verified the feasibility of the technology of one-expanding deep-hole blasting that regarded guide well as the free surface. Practice shows that the blasting method proposed in this paper will provide a new raising way to the enterprise which has high theoretical significance and practical application value.