姜立春 张要强

摘 要：针对高垂距条件下深竖井混凝土输送管道局部压力过大、磨损严重等问题，提出深竖井混凝土螺旋管降压输送方案，構建螺旋管降压输送计算模型，引入螺旋线方程及阻力修正系数a推导出螺旋管输送压降数学表达式，提出降压系数K，表征结构参数对降压效果的影响。以某深竖井工程为例进行计算，分析螺径与螺距对降压效果的影响，结果表明：K值与螺径间呈正相关关系，K值随螺径增大而增加，变化斜率较小，螺径值变化对降压效果影响较小;K值与螺距间呈负相关关系，随螺距减小而增大，变化斜率较大，螺径值变化对降压效果显著影响，工程实际中应优先减少螺距缓解混凝土输送管道压力，数值模拟结果与计算结果趋势线基本相似。研究成果将为深竖井混凝土料浆管道输送工程提供理论依据。关键词：深竖井;降压系数;混凝土输送;螺旋管模型 中图分类号：TD 26

文献标志码：A

文章编号：1672-9315（2020）06-0953-07

DOI：10.13800/j.cnki.xakjdxxb.2020.0603开放科学（资源服务）标识码（OSID）：

Calculation model of depressurization coefficient for concrete

helical pipeline transportation in deep shaft

JIANG Li-chun1，2，ZHANG Yao-qiang2，3

（1.School of Civil Engineering and Transportation，South China University of Technology，Guangzhou 510640，China;

2.Guangdong Provincial Science and Technology Collaborative Innovation Center for Work Safety，Guangzhou 510640，China;

3.Institute of Safety Science & Engineering，South China University of Technology，Guangzhou 510640，China）

Abstract：Aiming at the problems of excessive local pressure and serious wear of concrete transportation pipe in deep shaft under high vertical distance，a scheme of depressurization transportation of concrete helical pipe in deep shaft is put forward，the calculation model of depressurization transportation of helical pipe is constructed，the mathematical expression of depressurization of helical pipe transportation is derived by introducing the spiral equation and the resistance correction factor a，and the depressurization coefficient K is prepented to characterize the influence of structural parameters on the effect of depressurization.Taking a deep shaft project as an example，the calculation results show that there is a positive correlation between K value and spiral diameter.K value increases with the increase of spiral diameter.The change slope is smaller，and the change of spiral diameter has little influence on the effect of depressurization.K value has a negative correlation with screw pitch，and increases with the decrease of screw pitch.The change slope is larger，and the change of screw pitch has a significant impact on the effect of depressurization.The numerical simulation results are basically similar to the trend line of the calculated results.The research results will provide theoretical basis for concrete slurry pipe transportation engineering in deep shaft.Key words：deep shaft;depressurization coefficient;concrete transportation;helical pipe model

0 引 言

深部资源开采是未来获取矿产资源的主要方向[1-3]。深竖井作为矿山的咽喉要道，掘进过程井壁需要混凝土強力支护。目前混凝土输送主要采用溜灰管和吊桶相结合的方式进行，吊桶输送施工过程中存在输送能力不足、无法平行作业等问题[4-5]，管道输送成为必然趋势。螺旋管输送方案作为一种有效尝试，仍需要解决管道输送过程中高垂距产生的管道压力、管路载荷计算复杂等难题。因此，开展此方面研究具有十分重要的工程意义及应用价值。……