深埋硬岩中光面爆破设计优化及经验公式

发布时间：2019-02-12 06:48

【摘要】：光面爆破技术是隧道工程中广泛使用的施工技术。将光面爆破简化为平面应变问题,推导了光面爆破炮孔间距、最小抵抗线、不耦合装药系数和线装药密度等参数的计算公式;采用具有特定内插角度的炮孔代替传统的垂直钻孔,推导了内插孔的控制角度,优化了斜眼掏槽光面爆破技术。利用改进的斜眼掏槽光面爆破技术进行了现场试验与施工实践,结果表明:改进方案可以有效提高周边孔的炮孔利用率和光面爆破效果。对5000 mm跨、5500 mm跨、6000 mm跨三种典型断面洞室,对炮孔优化方案进行了现场试验,取得了炮孔装药量、岩体抗压强度、炮孔间距、最小抵抗线等特征参数的现场数据,并对试验数据进行拟合,得到了经验公式,该公式对硬岩中光面爆破参数选择具有参考价值。
[Abstract]:Smooth blasting technology is widely used in tunnel engineering construction technology. The smooth blasting is simplified as a plane strain problem, and the formulas for calculating the parameters such as the distance between the holes of the smooth blasting, the minimum resistance line, the uncoupled charge coefficient and the linear charge density are derived. The traditional vertical hole is replaced by a hole with a specific interpolation angle. The control angle of the inner hole is derived and the slant cut smooth blasting technology is optimized. The field test and construction practice were carried out by using the improved slant cut smooth blasting technology. The results show that the improved scheme can effectively improve the utilization ratio of the gunhole and the smooth blasting effect of the peripheral hole. For three typical cross section caverns, 5000 mm span, 5500 mm span and 6000 mm span, the field test was carried out on the optimization scheme of the hole, and the field data of the characteristic parameters, such as the charge quantity of the hole, the compressive strength of the rock mass, the interval between the holes, the minimum resistance line, and so on, were obtained. The empirical formula is obtained by fitting the test data. The formula has reference value for the selection of smooth blasting parameters in hard rock.
【作者单位】：解放军理工大学国防工程学院;解放军65715部队;
【基金】：国家自然科学青年基金资助项目(51304219) 中国博士后科学基金资助项目(2013M542427)
【分类号】：U455.6

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