基于激光测距技术的灌浆流量检测方法测量精度研究  

Research on measuring accuracy of grouting flow detection method based on laser ranging technology

作　　者：徐蒙[1,2,3] 费章辉 刘磊磊 李晋峰[4] 徐力生 XU Meng;FEI Zhanghui;LIU Leilei;LI Jinfeng;XU Lisheng(Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring of Ministry of Education,Central South University,Changsha 410083,China;School of Geosciences and Info-Physics,Central South University,Changsha 410083,China;Nonferrous Resources and Geological Hazard Key Laboratory of Hunan Province,Changsha 410083,China;China Railway Shanghai Design Institute Group Co.Ltd.,Shanghai 200070,China)

机构地区：[1]中南大学有色金属成矿预测与地质环境监测教育部重点实验室,湖南长沙410083 [2]中南大学地球科学与信息物理学院,湖南长沙410083 [3]湖南省有色金属资源与地质灾害探查重点实验室,湖南长沙410083 [4]中铁上海设计院集团有限公司,上海200070

出　　处：《中南大学学报（自然科学版）》2023年第5期1791-1803,共13页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51208514);湖南省自然科学基金资助项目(2023JJ30661);中国博士后科学基金资助项目(2017M612590)。

摘　　要：针对目前灌浆过程中使用电磁流量计测量低流速状态下浆液流量精度较低的问题,提出一种基于激光测距技术的灌浆流量实时检测方法。首先,通过理论分析,推导浆液流量计算公式,然后,利用Fluent软件对该检测方法的测量精度进行研究,并采用正交试验设计法研究浆液水灰比、搅拌桨转速、排浆速度这3个设计参数对该流量检测方法测量精度的影响。研究结果表明:采用测量液位高度得到低排浆速度下浆液实时流量的检测方法具有一定的可行性,将搅浆桶内液面高度下降4 mm所需时间作为单位时间计算浆液流量,所测流量相对误差在6%以内,且在0.013 m/s低排浆速度下,该检测方法测量精度较电磁流量计的测量精度有大幅度提升;排浆速度是影响流量测量精度的最直接因素,在低排浆速度下,排浆管内浆液易产生回流现象,进而加剧浆液液面的不稳定程度,导致流量测量误差偏大。Aiming at the problem of low accuracy of grout flow measured by electromagnetic flowmeter in grouting process,a real-time slurry flow detection method based on laser ranging technology was proposed.Firstly,through theoretical analysis,the slurry flow calculation formula was derived.Then,Fluent software was used to study the measurement accuracy of the detection method,and orthogonal experimental design method was used to study the influence of three design parameters,i.e.,slurry water-cement ratio,propeller speed and slurry discharge speed on the measurement accuracy of the flow detection method.The results show that it is feasible to measure the liquid level height to get the real-time slurry flow at low discharge speed.The relative error of measured flow is within 6% by taking the time required for the liquid level height to drop by 4 mm in the slurry barrel as unit time,and the measurement accuracy of this detection method is greatly improved compared with that of electromagnetic flowmeter at 0.013 m/s low discharge speed.The slurry discharge speed is the most direct factor affecting the accuracy of flow measurement.At low discharge speed,the slurry at the discharge pipe is easy to produce reflux phenomenon,which furtherly aggravates the instability of the grout level,resulting in large error of flow measurement.

关 键 词：流量检测 正交分析法 激光测距技术 数值仿真 

分 类 号：TU42[建筑科学—岩土工程]