渤海海峡及周边地应力分布规律与应力积累研究

发布时间：2018-03-05 22:13

本文选题：地质工程　切入点：渤海海峡　出处：《岩石力学与工程学报》2017年02期 　论文类型：期刊论文

【摘要】：为研究渤海海峡及周边表层、浅表层地应力分布规律的异同及区域应力积累程度,以通道中轴线上布设的5个浅钻水压致裂数据为基础,结合收集的周边区域深钻数据,建立了海峡处表层、周边区域浅表层应力参数随深度分布的离散点图,计算出了各参数与深度的回归公式,研究表明,Hσ和hσ两个水平主应力与深度符合线性关系式,HK,hK,aK三个侧压系数与深度符合双曲关系式,HhK,Hμ,mμ三个比值参数与深度的双曲线关系不明显,总体上更接近于线性分布。对比研究表层、浅层的回归公式发现,两者的水平主应力回归公式差异显著,侧压系数回归公式差异较小,比值参数的回归公式基本一致,揭示基于工程的表层应力测量数据也可以用于脆性地壳的应力积累与地震活动性分析中。分析区域能量积累状况,提出对于mμ0.7的浅部逆断点,需结合Hμ的值综合确定其能量积累程度;测点的Hμ,mμ值综合研究后认为渤海海峡19个表层测点及周边86%的浅层测点处于中低水平的应力积累中,地壳稳定性高;京津唐地区的部分测点应力积累水平较高,地壳稳定性差,需要密切关注,但对跨海通道工程的影响不大。取得的认识对环渤海区的构造应力场、断裂活动性研究及通道工程的建设具有重要的参考意义。
[Abstract]:In order to study the similarities and differences of ground stress distribution law and the degree of regional stress accumulation in the Bohai Strait and its surrounding surface and shallow surface layer, based on the 5 shallow drilling hydraulic fracturing data arranged on the axis of the channel, the paper combines the data collected from the deep drilling in the peripheral area. In this paper, the scattered plot of stress parameters with depth in the surface layer of the strait and the surrounding area is established, and the regression formulas between the parameters and the depth are calculated. The results show that the hyperbolic relationship between the three lateral pressure coefficients and the depth of the horizontal principal stress and depth is not obvious, and the hyperbolic relation between the three lateral pressure coefficients and the depth of the HhKU H 渭 m 渭 is not obvious. Comparing the surface layer and shallow layer regression formula, we find that there is significant difference between them in horizontal principal stress regression formula, the difference of lateral pressure coefficient regression formula is small, and the regression formula of ratio parameter is basically the same. It is revealed that the surface stress measurement data based on engineering can also be used in the stress accumulation and seismic activity analysis of brittle crust. The energy accumulation in the region is analyzed, and the shallow inverse fracture point of m 渭 0.7 is proposed. The energy accumulation degree should be determined by combining the value of H 渭 with that of H 渭 m 渭, and it is considered that 19 surface measuring points in the Bohai Strait and 86% in the surrounding shallow layer are in the middle and low level of stress accumulation and the crustal stability is high after the comprehensive study of the H 渭 m 渭 value of the measuring point. In the Beijing-Tianjin-Tangshan area, the stress accumulation level is relatively high and the crustal stability is poor, which requires close attention, but it has little influence on the cross-sea passage engineering. The obtained knowledge has great influence on the tectonic stress field around the Bohai Sea. The study of fault activity and the construction of channel engineering have important reference significance.
【作者单位】：中国海洋大学海洋地球科学学院;中国石油大学(华东)地球科学与技术学院;中国地质调查局青岛海洋地质研究所;青岛海洋科学与技术国家实验室海洋矿产资源评价与探测技术功能实验室;
【基金】：大陆架科学钻探项目(GZH201100202) 中国地质调查局项目(GZH201200504) 国家重点基础研究发展计划(973)项目(2013CB429700)~~
【分类号】：P642

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