山东地区现今地应力场特征与应力积累水平分析

发布时间：2018-08-05 12:42

【摘要】：山东地区地质构造环境十分复杂,历史上曾多次发生中强地震及强震。为深入了解该地区现今构造应力场特征及区域地壳应力积累水平,基于优化处理后的181组地应力实测数据,采用回归分析法全面分析了该地区地应力量值随深度的分布特征,并依据地壳应力积累理论,探讨了区域应力积累水平和地壳稳定性。结果表明,该地区地应力状态主要以σHσhσv型和σHσvσh型为主,应力状态类型与深度有一定关系;3个主应力σH,σh和σv均随深度呈近似线性增加的关系,应力变化梯度值分别为0.024 2,0.018 0,0.025 8;3个侧压系数KH,Kh和Kav随深度呈近似双曲线分布,随着深度的增加分别向1.46,0.89,1.17趋近;水平差应力相对大小μd更接近于线性分布,随着深度的增加趋向于0.24;最大水平主应力优势方向整体表现为NWW-SEE向,但NEE-SWW向也占有较大比例,优势方位统计结果与世界应力图2016及板块间作用相吻合;沂沭断裂带西侧区域最大水平主应力优势方向整体呈NEE-SWW向,而其东侧区域整体呈NWW-SEE向。mm能较好地反映地壳应力积累能力,mm值主要集中在0.3~0.5,0.2~0.3范围内,该地区的应力积累水平整体上处于中低程度,地壳浅层处于相对稳定状态。逆断型应力状态的mm值主要集中在0.2~0.3范围内,应力积累水平以较低程度为主;走滑型应力状态的mm值主要集中在0.3~0.5范围内,应力积累水平以中等程度为主。
[Abstract]:The geological and tectonic environment in Shandong is very complicated, and there have been many strong earthquakes and strong earthquakes in history. In order to understand the characteristics of tectonic stress field and the accumulation level of regional crustal stress in this area, based on the measured data of 181 groups of ground stress after optimization, the regression analysis method is used to analyze the stress value with depth in this area. According to the crustal stress accumulation theory, the regional stress accumulation level and the crustal stability are discussed. The results show that the stress state of the region is mainly based on the sigma H sigma h sigma V and sigma H sigma V H type, and the stress state type is related to the depth, and the 3 principal stresses, sigma H, sigma h and sigma V, are linearly increased with the depth. The gradient values are 0.024 2,0.018 0,0.025 8, respectively, 3 side pressure coefficients KH, Kh and Kav are approximately hyperbolic distribution with depth, as the depth increases respectively to 1.46,0.89,1.17, and the horizontal stress relative to the size of D is closer to the linear distribution, as the depth increases to 0.24; the maximum horizontal principal stress direction is the overall performance of N The WW-SEE direction, but the NEE-SWW direction also occupies a large proportion, the dominant position statistical results coincide with the world stress 2016 and interplate interaction. The maximum horizontal principal stress direction in the west side of the Yishu Fault Zone is NEE-SWW direction as a whole, and the overall NWW-SEE to.Mm in the east side region can better reflect the crustal stress accumulation ability, and the MM value is mainly concentrated. In the range of 0.3~0.5,0.2~0.3, the stress accumulation level in this area is in the middle and low level, and the shallow crust in the crust is in a relatively stable state. The MM value of the stress state of the reverse type is mainly concentrated in the 0.2~0.3 range, and the stress accumulation level is mainly in the lower degree; the MM value of the strike slip stress state is mainly concentrated in the range of 0.3~0.5 and the stress accumulation is accumulated. The level is moderate.
【作者单位】：北京科技大学土木与资源工程学院;北京科技大学金属矿山高效开采与安全教育部重点实验室;
【基金】：国家重点研发计划(2016YFC0600703) 中央高校基本科研业务费专项资金资助项目(FRF-TP 16 017A3)~~
【分类号】：P315.7

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