Expansive pressure characteristic and borehole parameter analysis on large scale borehole soundless cracking
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摘要: 大孔径静态破碎与传统静态破碎有着显著的不同。利用电测法测量了直径40和100 mm钢管中的破碎剂膨胀压力和温度，对比分析了两种工况下的不同现象。实验表明，孔径的增加能够提高膨胀压力，加快反应速度。基于实验的数据，利用有限元方法计算了静态破碎时钻孔周围岩石介质中的应力分布。基于实验数据和有限元数值计算结果，使用数据拟合方法对静态破碎时岩石中的应力分布弹性模型进行修正，得到了应力分布方程。利用该方程推导的布孔参数计算公式，适合运用于实际工程之中。Abstract: Large scale borehole soundless cracking is significantly different from traditional soundless cracking. Experiments were made to measure the expansive pressure of the soundless cracking agent (SCA) working in the boreholes of ∅40 mm and ∅100 mm. The different phenomenon between two sizes of cracking was compared and analyzed to show that the increase of borehole diameter could increase the expansive pressure and speed up the reaction. Based on the experimental data, finite element analysis was utilized to study the stress concentration and stress distribution around the borehole during the cracking process. Using the experimental data and the results of the finite element method, the elastic model of rock stress distribution was modified, and the stress distribution equations were proposed. The formulas of borehole arrangement parameters deduced by those equations are suitable for the actual engineering.
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表 1 钢管实验数据
Table 1. Experimental data of steel tube
d/mm η/% ps/MPa Tm/℃ t0/min 40 32 30 35 40 100 32 97 235 40 
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