基于MRDA-FLPEM集成算法的综采工作面矿压迁移预测
Transfer prediction of underground pressure for fully mechanized mining face based on MRDA-FLPEM integrated algorithm
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摘要: 基于液压支架工作阻力监测数据对综采工作面矿压进行预测,是实现工作面顶板周期来压超前预警的有效手段,对于动态改善支架适应性和优化围岩支护质量具有重要意义。然而,地下采场环境特殊,液压支架所处工作面位置不同耦合围岩变工况复杂开采条件易造成支架工作阻力数据时序分布差异化,同时生产过程存在非线性和不确定性等特点,严重影响数据驱动模型的预测精度。因此,针对综采工作面液压支架支护过程中耦合变工况影响支架工作阻力数据分布导致的预测模型失准的问题,提出一种基于流形正则域适应函数链接预测误差集成算法的综采工作面矿压预测方法。该方法首先采用流形正则域适应算法寻找特征映射矩阵,将源域和目标域数据的特征信息统一映射至公共空间,以保持耦合变工况下源域和目标域数据几何结构分布一致性;然后基于函数链接预测误差法,在公共空间利用源域数据建立预测模型得到相应液压支架工作阻力的预测值,从而完成综采工作面矿压超前预测,同时降低多工况数据时序分布差异对模型精度的影响。结果表明:该集成算法可改善多工况数据分布差异对预测模型精度的影响,提高模型鲁棒性和泛化能力,为后续分析工作面矿压显现规律,超前适应采场环境变化,指导工作面正常回采提供依据。Abstract: Based on the working resistance monitoring data of hydraulic support, the perceptual prediction of strata behavior in the fully mechanized mining face is an effective means to realize the early warning and early response of periodic pressure on the roof of working face, and plays an important role in improving the adaptability of hydraulic support and optimizing the quality of surrounding rock control dynamically.However, underground environment is special, different positions in the working face lead to an inconsistent data distribution of work resistance of hydraulic support due to variable working conditions.Simultaneously, the production process has the characteristics of nonlinearity and uncertainty, which seriously affect the accuracy of the data-driven mining pressure prediction model.Therefore, for the problems that prediction accuracy is affected by inconsistent working resistance data distribution due to the frequent changes of working conditions, a novel robust regression model of ground pressure for fully mechanized mining face considering the domain adaptation of data distribution based on manifold regular domain adaptation integrated function link prediction error method(MRDA-FLPEM) algorithm is proposed.Firstly, the manifold regular domain adaptation algorithm is introduced to obtain the feature map matrix, which can map the data distribution structure of source and target domains to a public space uniformly so that the consistency of the data distribution under multiple working conditions can be maintained.Then the function link prediction error method is used to establish a mining pressure prediction model based on the migrated data of source domain, and improve modeling based on the target domain data, which can reduce the influence of the time series data distribution difference of multiple working conditions on the accuracy of the prediction model.The effectiveness of the proposed integrated algorithm is validated from a fully mechanized mining face, and the results demonstrate that the proposed algorithm can improve the influence of data distribution differences in multi-conditions on the prediction model, improve the robustness and generalization ability of the model, which can establish a foundation for the subsequent analysis of strata behavior law in the fully mechanized mining face, adapt to the changes of environment in advance, and guide the normal mining operation.