立井冻土爆破技术的研究

建立了冻土爆破冻结管震动破坏准则,进行了冻土爆破性的分析,根据冻土掏槽参数和光面爆破参数的模型试验进行冻土爆破参数的设计,并结合冻土爆破实际,提出了冻土爆破前的准备工作,如详细分析爆破作业区内冻结管的偏斜情况,计算每根冻结管距井帮的最短距离,根据井筒断面及冻结土层的特性,选择钻眼设备等。经过实践,既保证施工安全,又提高了效率。

Research on Frozen Soil Blasting Techniques in Shaft

Blasting of frozen soil is under negative temperature and the frozen-tube is near, so the blasting is different from the ordinary rock, and raises the blasting efficiency under the requirement of the safety of the frozen-tube. Firstly, failure criterion is established. Secondly, blastability of frozen soil are tested and analyzed. According to model experiments of cut and smooth blasting, blasting parameters are calculated and designed. Combining the blasting practice of artificially frozen soil of shaft, preparation works before blasting are proposed, such as the deviation calculation of freezing tube. In the light of the characteristics of frozen soil and shaft area, drilling machine and construction machine are chosen. By blasting practice the blasting techiques protects the safety of frozne-tube and raise the construction efficiency.