CAJ | 학술논문

以锦屏二级水电站微震监测数据为基础,将矩张量引入到深埋隧洞岩爆机制分析研究中.对分析过程中遇到的2个关键问题提出了针对性的建议:①隧洞工程为线性工程,传感器布置空间有限,难以形成良性传感器阵列,矩张量分析结果的可靠性受到很大的影响,为此,提出了数值计算过程中的坐标系空间旋转法.该方法按最优路径旋转隧道坐标系,使对于同一个事件的每个传感器,源-传感器射线到新坐标系的3个方向余弦差值在10倍数值范围以内,在数值计算过程中,可以得到较理想的矩张量结果.②针对 Ohtsu 使用矩张量分解判断岩石破裂类型的方法中,提出的各分量比重计算公式,仅适用于各分量均为受拉的情况.考虑快速掘进条件下隧洞工程受力方向的不确定性,扩展其分量比重计算公式到更一般适用状态.在此基础上,建立了一套完整的岩爆孕育过程矩张量分析方法.利用该方法对锦屏二级水电站典型岩爆微震数据进行分析,结果表明,该方法可以较好地解释岩爆孕育过程岩石破裂演化机制.
이금병이급수전참미진감측수거위기출,장구장량인입도심매수동암폭궤제분석연구중.대분석과정중우도적2개관건문제제출료침대성적건의:①수동공정위선성공정,전감기포치공간유한,난이형성량성전감기진렬,구장량분석결과적가고성수도흔대적영향,위차,제출료수치계산과정중적좌표계공간선전법.해방법안최우로경선전수도좌표계,사대우동일개사건적매개전감기,원-전감기사선도신좌표계적3개방향여현차치재10배수치범위이내,재수치계산과정중,가이득도교이상적구장량결과.②침대 Ohtsu 사용구장량분해판단암석파렬류형적방법중,제출적각분량비중계산공식,부괄용우각분량균위수랍적정황.고필쾌속굴진조건하수동공정수력방향적불학정성,확전기분량비중계산공식도경일반괄용상태.재차기출상,건립료일투완정적암폭잉육과정구장량분석방법.이용해방법대금병이급수전참전형암폭미진수거진행분석,결과표명,해방법가이교호지해석암폭잉육과정암석파렬연화궤제.
Moment tensor method is introduced to analyze rockburst mechanism for deep tunnel, based on microseismic monitoring data of Jinping Ⅱ hydropower station. And some recommendations are proposed for two key issues in the analysis process: ①Restricted by the construction environment in the tunnels, tunnels are excavated in a straight line, and sensors can only be installed at the wall of tunnel or in the shallow boreholes. The calculation reliability of moment tensor is affected greatly on the numerical calculation; the coordinate rotation method is given to improve it. This method rotates the tunnel coordinate system to the new coordinate system, which makes the value of the direction cosine between the source-sensor vector and every coordinate axis less than 10 times, for every waveforms in the event. The ideal results can be got from a large number of moment tensor calculation. ②To get rockburst nucleation process, which calculates the moment tensor firstly, and decompose the moment tensor to the components of basic type, judge the rock fracture type based on the rule from the percentage of the components. But the rule proposed by Ohtsu is only applicable to all components by pulling, which is not suitable to tunnels of fast drilling; therefore, one rule is proposed to extend a more generally applicable state. Lastly, the complete method is established which used to research rockburst nucleation process by the moment tensor method. Analyzed microseismic data of Jinping Ⅱ hydropower station before rockburst happened by this method, the results show that the method can explain the evolution of rock failure mechanism better.