平顶山矿区构造应力场演化规律及分布特征

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摘要为探讨平顶山矿区构造应力场演化规律及分布特征，采集共轭剪节理、断层擦痕、矿区构造等数据，运用赤平极射投影法恢复研究区古构造应力的方向，分析矿区古构造应力场及演化规律；基于地应力和震源机制解资料，运用构造物理学和岩石力学方法解析现今构造应力的大小和方向，获得矿区现今构造应力场分布特征及分区图。古构造应力场重构表明，该矿区主要经历了印支、燕山、喜山三期构造应力场作用，印支期最大主应力方向近NS向，优选产状3°∠6°；早燕山期最大主应力方向NW向，优选产状313°∠13°；晚燕山期最大主应力方向NE向，优选产状54°∠9°；喜山期最大主应力方向NNE向，优选产状18°∠15°；在多期构造应力场作用下，矿区形成了李口向斜控制下的一系列NWW～NW向褶曲和断裂，并伴生NNE～NE向次级断裂构造。现今构造应力场解析显示，该矿区现今构造应力场具有分区特征，矿区整体为大地动力场型，西部矿区以正断层应力场型占主导，中部矿区以走滑断层应力场型占主导，东部矿区以逆断层应力场型和走滑断层应力场型占主导；矿区总体为高应力值区，从西向东应力值呈现升高趋势，应力场稳定性处于相对稳定与临界状态之间；矿区最大水平主应力方向以NEE向为主，断裂附近主应力方向发生明显偏转；随埋深增加，主应力值逐渐增大、侧压比逐渐减小、应力场类型有从大地动力场型向准静水压力场型过渡的趋势。研究成果为矿井巷道布置和预防煤岩瓦斯动力灾害提供了科学依据。

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	郭德勇1
	揣筱升1
	张建国2
	张浩权2

关键词 ：采矿工程, 平顶山矿区, 构造应力场, 构造解析, 演化规律, 分布特征

Abstract：To investigate the evolution pattern and distribution characteristics of tectonic stress field in Pingdingshan mining area，based on conjugate shear joints，fault slickenside and structure of the mining area data，the Stereographic projection method was applied to restore the direction of the paleotectonic stress in the research area. The characteristics and evolution pattern of the paleotectonic stress field were analyzed. By means of collecting in-situ stress and focal mechanism solution data，the tectonophysics and rock mechanics methods were applied to analyze the magnitude and direction of the present tectonic stress. The distribution characteristics and partitioned graph of the present tectonic stress field were got. The reconstruction results of the paleotectonic stress field showed that the mining area mainly got through three periods of tectonic stress field movement including Indosinian period，Yanshanian period(including Early and Late period) and Himalayan period. The directions of the maximum principal stress were nearly NS，NW，NE and NNE，respectively. The preferred attitudes of the directions were 3°∠6°，313°∠13°，54°∠9° and 18°∠15°. Under multistage tectonic stress field，Pingdingshan mining area formed geological structure on a series of NWW–NW directions folds and faults with NNE–NE directions secondary faults under the control of Likou syncline. The analytical results of the present tectonic stress field showed that the mine area has the partitioned characteristics. As the whole，the mining area manifests as dynamic stress field. The stress field type of the normal fault dominates absolutely in the west mining area. The stress field type of the strike-slip fault dominates absolutely in the middle mining area. The stress field type of the reverse fault and the strike-slip fault dominates in the east mining area. The mining area belongs to high stress region. In the regional mining area，the trend of the stress value is in a gradually increasing process from the west area to the east area. The stability of the stress field is between the relative stable state and the critical state. The maximum horizontal principal stress direction is NEE. The direction of the principle stress have undergone obvious changes in near faults. With the increasing of the buried deepness，the principal stress is gradually increasing，the coefficient of the horizontal pressure is decreasing，and the stress field has the changing tendency from dynamic to static. Research results provide the scientific basis for guiding mine roadway layout and preventing coal and rock dynamic disaster in mining area.

Key words： mining engineering Pingdingshan mining area tectonic stress field tectonic analysis evolution pattern distribution characteristics

引用本文:

郭德勇1，揣筱升1，张建国2，张浩权2. 平顶山矿区构造应力场演化规律及分布特征[J]. 岩石力学与工程学报, 2022, 41(6): 1208-1222.
GUO Deyong1，CHUAI Xiaosheng1，ZHANG Jianguo2，ZHANG Haoquan2. The evolution pattern and distribution characteristics of tectonic stress#br# field in Pingdingshan mining area. , 2022, 41(6): 1208-1222.

链接本文:

http://rockmech.whrsm.ac.cn/CN/Y2022/V41/I6/1208

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