Exploration and application of deep learning based wellbore deformation forecasting model
刘辉李国强朱晓峻张鹏飞程桦王金正李培帅
LIU Hui;LI Guoqiang;ZHU Xiaojun;ZHANG Pengfei;CHENG Hua;WANG Jinzheng;LI Peishuai
安徽大学 资源与环境工程学院安徽省矿山生态修复工程实验室山东能源集团鲁西矿业有限公司郭屯煤矿
近年来我国东部矿区发生了多起立井井筒倾斜变形及破损灾害,严重影响了矿井安全与生产。针对厚含水松散层深立井倾斜破损灾害,以鲁南某矿深立井井筒(800 m)为研究对象,开展了井筒倾斜变形监测,研究了井筒倾斜时空变化特征,分析了井筒倾斜主要影响因素;在此基础上,基于深度学习理论,综合采用循环神经网络(RNN)、长短期记忆网络(LSTM)、门控循环单元(GRU)、一维卷积神经网络(1DCNN)4种经典深度学习方法,构建了井筒倾斜变形预测模型,并将预测结果与实测值进行对比,分析了井筒变形预测模型精度,研究了井筒整体和关键区域预测效果,验证了模型可靠性,并开展了工程应用。研究表明:(1)井筒倾斜主要发生在松散层,倾斜值由浅到深线性减小、并偏向采空区一侧,最大为352 mm,基岩层变形较小,最大为88 mm;开采引起厚松散层变形传播范围增大、底部含水层沿井壁渗流疏水及地下水渗流场的变化是导致井筒倾斜变形的主要原因。(2)模型与实测值Spearman相关系数最大为0.978,最小为0.867,4种模型与现场实测偏移量的最大差值为0.043 m,平均绝对误差
In recent years, a number of vertical shaft tilt deformation and breakage disasters have occurred in the eastern mining areas of China, which have seriously affected mine safety and production. In response to the tilting and damage disasters of deep vertical shafts in thick water-bearing loose layers, the tilting and deformation monitoring of shafts was carried out by taking the deep vertical shaft (800 m) of a mine in Lunan as the research object, studying the spatial and temporal change characteristics of shaft tilting, and analyzing the main influencing factors of shaft tilting; based on this, based on the deep learning theory, four types of deep learning method, namely, recurrent neural network (RNN), long and short-term memory network (LSTM), gated recurrent unit (GRU), and one-dimensional convolutional neural network (1DCNN), were used. unit (GRU), and one-dimensional convolutional neural network (1DCNN) to construct a wellbore tilt deformation prediction model, and compare the prediction results with the measured values to analyze the accuracy of the wellbore deformation prediction model, validate the reliability of the model, studied overall wellbore and critical area prediction effects, and carry out engineering applications. The study shows that:(1) The wellbore tilt mainly occurs in the loose layer, the tilt value decreases linearly from shallow to deep, and is biased towards the side of the extraction zone, with a maximum of 352 mm, and the deformation of the bedrock layer is smaller, with a maximum of 88 mm;the increase in the range of deformation propagation in the thick loose layer caused by the mining, and the change of seepage hydrophobicity of the aquifer at the bottom along the wall of the well and the seepage field of the groundwater are the main causes of the tilted deformation of the wellbore. (2) The Spearman correlation coefficient between the model and the measured value is 0.978 at the maximum and 0.867 at the minimum;the maximum difference between the four models and the field measured offsets is 0.043 m, the mean absolute error
煤矿立井倾斜变形深度学习井筒预测神经网络
Mine Vertical Shaft;deflection deformation;deep learning;wellbore forecasting;neural network
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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会