土体变形破坏电磁辐射效应及前兆特征识别研究

项目名称： 土体变形破坏电磁辐射效应及前兆特征识别研究

项目编号： No.51504244

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 矿业工程

项目作者： 赵恩来

作者单位： 中国矿业大学

项目金额： 20万元

中文摘要： 土体破坏失稳会带来崩塌、滑坡及地表塌陷等地质灾害与工程问题，造成惨重的损失。灾害前兆信息的准确识别是防治地质灾害的重要基础。本项目拟研究不同性质土体材料在不同加载条件下失稳破坏过程多频电磁辐射特征规律，分析土体性质、预制弱面、视电阻率及含水量对其变形破裂过程电磁辐射影响；研究确定土体破坏电磁辐射前兆特征规律及优势特征频率，并分析其与土体材料损伤的关系，建立基于电磁辐射的土体损伤力-电-能耦合模型；现场测试边坡动力失稳破坏过程的多频电磁辐射响应规律，建立多频电磁辐射信号与边坡稳定性及危险程度的关系，初步提出土体边坡稳定性评估的电磁辐射监测方法。项目的研究成果对进一步揭示土体材料损伤破坏的微观过程和电磁辐射产生机理，促进煤岩电磁辐射监测技术的发展和应用具有深远的理论意义和现实意义。

中文关键词： 电磁辐射；土体；优势频率；前兆识别

英文摘要： Geological disasters and engineering problems such as collapse, landslide and ground subsidence are caused by soil failure, which can cause heavy losses. Recognition of disaster precursor is an important basis for preventing geological disasters. The characteristics and precursor of variation frequency of electromagnetic radiation (EMR) in different soil are studied under different loading condition. Then, we analyze the physical mechanics parameters, pre-crack and electrical parameters of soil effecting on variation frequency in electromagnetic radiation during the process of soil fracture. We study the relationship between soil damage and dominant characteristics frequency of EMR of soil under different stress level, and establish the coupling model of stress, EMR and energy for soil damage based on the dominant characteristics frequency of EMR. Then the generation mechanism of electromagnetic radiation in soil failure is discussed theoretically. After that, we study the haracteristics of variation frequency of EMR in the dynamic instability and evolution process of Side-slope, to establish the relationship between the dominant characteristics frequency of EMR and the risk degree of side-slope, and to propose a side-slope stability assessment method based on EMR variation monitoring. The results have important significance not only for theoretical and but also for practical significance in further revealing microscopic processes of the soil fracture and generation mechanism of electromagnetic radiation, and which can promote the application of electromagnetic radiation monitoring technique.

英文关键词： electromagnetic radiation;soil;domiant frequency;precursor recognition