浅部和深部工程区地应力场及断裂稳定性比较

发布时间：2018-04-04 13:33

本文选题：优化处理　切入点：实测地应力数据　出处：《哈尔滨工业大学学报》2017年09期

【摘要】：为研究浅部和深部工程区构造应力场的差异,依据优化处理后的浅部376组和深部619组实测地应力数据,采用回归分析法和断裂摩擦滑动准则对浅部和深部的地应力场特征及断裂稳定性进行比较分析.结果表明,与浅部相比,深部地应力场有从构造应力场向垂直应力场转变的趋势.深部的主应力与深度的线性相关程度比浅部的高.随着深度的增加,浅部的侧压系数K_(H1)、K_(h1)分别向1.54、0.85趋近,深部的侧压系数K_(H2)、K_(h2)分别向1.15、0.85趋近.浅部、深部的水平差应力η_1、η_2整体上随深度增加有增大的趋势.滑动摩擦系数μ取1.0时,浅部和深部断裂基本处于相对稳定状态;μ取0.6时,浅部逆断层有较大的滑动可能性,深部断裂滑动失稳的可能性较小;μ弱化到0.4、0.2时,浅部和深部断裂发生滑动失稳的可能性显著增加.浅部和深部断裂滑动失稳标准分别取μ为0.6~1.0、0.4~0.6较合适,逆断层和走滑断层的滑动失稳标准可以分别取μ为0.6、0.4左右.
[Abstract]:In order to study the difference of tectonic stress fields between shallow and deep engineering areas, the geostress data of 376 groups of shallow and 619 groups of deep ones after optimized treatment were used.The characteristics of in-situ stress field and fracture stability in shallow and deep region are analyzed by means of regression analysis and friction sliding criterion.The results show that, compared with the shallow part, the deep field of in-situ stress changes from the tectonic stress field to the vertical stress field.The linear correlation between the depth and the principal stress in the depth is higher than that in the shallow.With the increase of depth, the lateral pressure coefficient K _ (1) of shallow area approaches to 1.54 ~ (0.85), and the coefficient of lateral pressure from deep to 1.15 ~ (0.85) approaches to 1.15 ~ 0.85, respectively.The horizontal differential stress 畏 _ 1 and 畏 _ 2 increase with the increase of depth.When the sliding friction coefficient 渭 is 1.0, the shallow and deep faults are basically in a relatively stable state; when 渭 is 0.6, the shallow thrust fault has a greater possibility of sliding, while the deep fault is less likely to slip, and 渭 weakens to 0.4 and 0.2.The possibility of sliding instability in shallow and deep faults increases significantly.The standard of sliding instability of shallow and deep faults is better than that of thrust fault and strike-slip fault with 渭 = 0.6 ~ 1.0 ~ 0.40.0.The criterion of sliding instability of reverse fault and strike-slip fault is about 0.6 ~ 0.4 respectively.
【作者单位】：北京科技大学土木与资源工程学院;金属矿山高效开采与安全教育部重点实验室(北京科技大学);
【基金】：国家重点研发计划(2016YFC0600703) 国家重点基础研究发展计划青年科学家项目(2015CB060200) 中央高校基本科研业务费专项资金(FRF-TP-16-017A3)
【分类号】：P55;P642

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