煤长壁深部开采过程中重力场变化及其与应力分布和地震活动的关系

IF 0.7 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Journal of Sustainable Mining Pub Date : 2021-11-25 DOI:10.46873/2300-3960.1326
Łukasz Kortas
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引用次数: 1

摘要

采矿作业引起岩体内部的体积变形和密度变化,这是重力法很敏感的。这些变化在局部重力场的周期性测量中尤为明显。本文分析了煤层长壁移动与地表观测到的重力场时空分布变化之间的关系。在2018 - 2020年期间进行了6个系列的相对重力测量;采煤开始前,随着长壁的进展,采煤停止后。收集到的数据可以绘制出重力变化的差异图。然后分析了后续测量序列与参考序列之间的差异异常。这些异常的分布和时间变化表明,长壁覆岩中岩石介质密度分布的变化与长壁前缘通过引起的岩体应力状态的变化有关。试图将长壁覆岩应力状态的变化与长壁开采过程中能量> 10e4j的地震烈度联系起来。
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Gravity field changes during deep exploitation of the coal longwall and their relation to stress distribution and seismic activity
Mining operations cause volumetric deformations within the rock mass and changes in its density, to which the gravimetric method is sensitive. These changes are particularly well seen in periodic measurements of the local gravity field. The paper analyses the relationship between the movement of a longwall in a coal seam and the change in the distribution of the gravity field in time and space observed on the ground surface. Relative gravimetric measurements were carried out in six series between 2018 and 2020; before the start of coal extraction, with the progress of the longwall and after the cessation of mining. Collected data allowed differential maps of changes in gravity to be plotted. Differential anomalies between the subsequent measurement series, and the reference one were then analysed. The distribution and temporal variations of the anomalies suggest a relationship between changes in density distribution of the rock medium in the longwall overburden, and the change in the stress state in the rock mass caused by the passage of the longwall front. An attempt was made to relate the variability of the state of stresses in the longwall overburden to the intensity of seismic tremors with energy >10E4 J accompanying longwall exploitation.
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来源期刊
Journal of Sustainable Mining
Journal of Sustainable Mining Earth and Planetary Sciences-Geology
CiteScore
1.50
自引率
10.00%
发文量
20
审稿时长
16 weeks
期刊最新文献
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