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本文系统地总结了垂直底射和水平底射的试验;根据试验结果从理论上对实现底射的条件进行了分析;提出了经验数据、计算公式和确定底射工艺参数的方法。文章指出,防止砂层被气流击穿是实现底射的前提;在此前提下,通过砂层的气流速度和进气量大于某一定数值时,便可实现底射。控制射砂压力和送气时间可控气流速度和进气量的大小。本试验条件下,要实现底射要求射砂压力大于1.8k9/cm。,送气时间要控制在0.4～0.6抄之内。
In this paper, we systematically summarize the experiments of vertical bottom-shooting and horizontal bottom-shooting. According to the experimental results, the conditions for realizing the bottom-shooting are theoretically analyzed. The empirical data, calculation formulas and the method of determining the parameters of the bottom-shooting are proposed. The article points out that preventing sand from being broken down by gas flow is the prerequisite for achieving bottom emission; under this premise, bottom emission can be achieved when the gas velocity and intake air through the sand layer are greater than a certain value. Control of sand pressure and air supply time control air flow speed and the size of the intake. Under the conditions of this test, the shotcrete pressure required to achieve the bottom shot should be greater than 1.8k9 / cm. , Aspirated time should be controlled within 0.4 ~ 0.6 copy.