三维模型采场覆岩变形分布式监测及其数据处理软件开发

发布时间：2018-04-15 16:50

本文选题：三维模型 + 分布式光纤传感技术　；参考：《西安科技大学》2017年硕士论文

【摘要】：三维相似模拟试验是研究采场矿压显现及覆岩移动变形特征的重要方法之一,然而三维相似模型厚度大,模型内部岩层的移动变形特征无法用肉眼看见,无法知道采场覆岩移动变形的规律,因此必须借助其他方法对模型内部岩层的移动变形进行监测。本文介绍了脉冲预泵浦布里渊光时域分析技术(Pulse-PrePump Brillouin Optical Time Domain Analysis,PPP-BOTDA)的传感原理,分析了光纤布里渊频移与温度和应变的关系,给出了分布式光纤监测覆岩变形的可行性;同时分析了垂直光纤的布里渊频移曲线变化特征与覆岩移动变形特征的关系,提出了基于垂直的分布式光纤的判别三维相似试验中模拟工作面的来压情况的方法;分析了垂直光纤的布里渊频移曲线的特征,提出了垂直光纤确定三维模拟内部的覆岩破坏变形高度和垮落带高度的方法。为了验证上述方法的正确性,通过以在实验室模拟出现场工作面开采过程中上覆岩层移动变形特征为目标,设计三维相似材料模拟试验,构建了PPP-BOTDA分布式光纤传感监测系统,同时为了验证分布式光纤的监测结果的准确性,自行设计一套三维模型内部位移测量装置,并将这两套监测系统运用到模拟工作面上覆岩层中对应覆岩移动变形进行监测。三维相似模拟试验结果表明,基于PPP-BOTDA的分布式光纤传感技术实现了对三维模型模拟工作面的来压位置确定,同时确定了三维模型内部破坏变形高度和垮落带高度,该技术为了人类研究提供了一双能观测三维模型内部的变形的“眼睛”,同时为了能使得上述信息能快速获取,自行开发了分布式光纤数据处理分析系统,该系统的研发使得试验数据处理能够快速显示,及时掌握了覆岩内部变形情况,改变了以往“先试验-后处理”的试验模式,实现试验和数据处理同步进行处理,该系统的开发为这双“眼睛”提高了观测效率,为这项技术现场应用提供指导意义。
[Abstract]:Three-dimensional similarity simulation test is one of the important methods to study the characteristics of strata pressure and overlying rock movement and deformation. However, the thickness of three-dimensional similarity model is so large that the characteristics of movement and deformation of strata inside the model can not be seen with the naked eye.It is impossible to know the law of strata movement and deformation in stope, so it is necessary to monitor the movement and deformation of strata inside the model by other methods.In this paper, the sensing principle of Pulse-Preump Brillouin Optical Time Domain Analysis (PPP-BOTDAA) is introduced, the relationship between Brillouin frequency shift and temperature and strain is analyzed, and the feasibility of monitoring overburden deformation by distributed optical fiber is given.At the same time, the relationship between Brillouin frequency shift curve of vertical optical fiber and the deformation characteristics of overburden is analyzed, and the method of discriminating the pressure of working face in 3D similar test based on vertical distributed fiber is put forward.The characteristics of Brillouin frequency shift curve of vertical fiber are analyzed, and a method for determining the height of deformation and collapse zone of collapse zone in 3D simulation is put forward.In order to verify the correctness of the above methods, a PPP-BOTDA distributed optical fiber sensor monitoring system is constructed by using the object of simulating the movement and deformation characteristics of the overlying strata during the mining process of the working face in the laboratory, and designing a three-dimensional simulation test of the similar material.At the same time, in order to verify the accuracy of the monitoring results of distributed optical fiber, a set of internal displacement measurement device of 3D model is designed, and the two monitoring systems are applied to monitor the movement and deformation of overburden strata in simulated working face.The experimental results of 3D similarity simulation show that the distributed optical fiber sensing technology based on PPP-BOTDA can determine the pressure position of 3D model simulation face and determine the height of internal failure deformation and collapse zone of 3D model.This technique provides a pair of "eyes" that can observe the deformation inside the three-dimensional model for human research. In order to make the above information available quickly, a distributed optical fiber data processing and analysis system is developed.With the development of the system, the test data processing can be quickly displayed, the deformation of overburden rock can be grasped in time, the former test mode of "first test and then processing" has been changed, and the simultaneous processing of test and data processing has been realized.The development of the system improves the observation efficiency and provides guidance for the field application of this technique.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325.4

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