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成兰铁路地应力测量与构造应力场分布规律研究

包林海 杜义 郭啟良 张彦山

包林海, 杜义, 郭啟良, 等, 2017. 成兰铁路地应力测量与构造应力场分布规律研究. 地质力学学报, 23 (5): 734-742.
引用本文: 包林海, 杜义, 郭啟良, 等, 2017. 成兰铁路地应力测量与构造应力场分布规律研究. 地质力学学报, 23 (5): 734-742.
BAO Linhai, DU Yi, GUO Qiliang, et al., 2017. IN-SITU STRESS MEASUREMENT AND RESEARCH ON TECTONIC STRESS FIELD DISTRIBUTION LAW OF CHENGDU-LANZHOU RAILWAY. Journal of Geomechanics, 23 (5): 734-742.
Citation: BAO Linhai, DU Yi, GUO Qiliang, et al., 2017. IN-SITU STRESS MEASUREMENT AND RESEARCH ON TECTONIC STRESS FIELD DISTRIBUTION LAW OF CHENGDU-LANZHOU RAILWAY. Journal of Geomechanics, 23 (5): 734-742.

成兰铁路地应力测量与构造应力场分布规律研究

基金项目: 

中国地质调查局项目 DD20160271

详细信息
    作者简介:

    包林海(1982-), 男, 硕士, 副研究员, 主要从事地应力测量方面的研究。E-mail:hailinbao@126.com

  • 中图分类号: P553

IN-SITU STRESS MEASUREMENT AND RESEARCH ON TECTONIC STRESS FIELD DISTRIBUTION LAW OF CHENGDU-LANZHOU RAILWAY

  • 摘要: 成兰铁路位于青藏高原东部边缘高山峡谷区,由于印度板块与欧亚板块碰撞,区域内构造变形强烈,构造应力场十分复杂。为研究成兰铁路工程区地应力分布规律及断层稳定性,在铁路沿线茂县、松潘县以及宕昌县境内4个深孔水压致裂地应力测量基础上,获得了不同位置区域地应力实测值的大小和方向,并建立工程区应力参数随深度分布规律。分析表明:工程区应力随深度变化呈现出较好的线性关系,在测试深度范围内,水平应力普遍高于垂直主应力,地应力值总体上属于中—高地应力级别,在750 m深度内,最大水平主应力达25 MPa,反映出工程区构造应力占主导地位,侧压系数随深度呈缓慢衰减趋势。成兰铁路在不同构造单元上最大水平主应力方向有所不同,在东昆仑断裂以北甘南块体内,最大水平主应力为北北东向,在东昆仑断裂以南川青块体内最大水平主应力为北西向。根据实测的地应力数据并结合库伦滑动摩擦准则,对工程区内的断层稳定性进行了分析。文中取得的认识对成兰铁路工程区的构造应力场、断裂活动性的研究以及隧道工程的建设具有重要的参考意义。

     

  • 图  1  区域地质构造与地应力测点

    Figure  1.  Regional geological structure and in-situ stress measurement points

    图  2  水压致裂地应力测量曲线

    Pb-破裂压力; Pr-重张压力; Ps-闭合压力

    Figure  2.  Pressure-time curves by hydraulic fracturing method

    图  3  主应力大小和应力比值随深度分布

    SH-最大水平重压力; Sh-最小水平重压力; SV-垂直重压力

    Figure  3.  Distributions of principal stresses and the stress ratios with depth-variant

    图  4  侧压系数随深度变化的回归分析

    Figure  4.  Regression analysis of lateral pressure coefficient values with depth-variant

    图  5  最大水平主应力方向随深度分布

    Figure  5.  Distribution of the maximum horizontal stress orientations with depth-variant

    图  6  青藏高原及邻区地壳水平运动特征

    Figure  6.  Characteristics of the crust horizontal motion in Qinghai-Tibet plateau and its adjacent areas

    图  7  基于实测数据的摩擦滑动计算结果

    S1-最大重应力值; P0-孔隙水压力; μ-摩擦系数

    Figure  7.  Calculation results based on measured in-situ stress data using frictional failure criterion

    表  1  地应力测量结果

    Table  1.   In-situ stress measurement data

    孔号 测试深度/m 主应力量值/MPa 应力方向
    SH Sh SV
    ZK1 511.76 18.02 12.52 13.30
    543.44 19.83 13.33 14.12
    576.85 20.66 13.66 14.99 N22°E
    604.32 22.93 14.93 15.70 N42°E
    630.05 23.68 15.68 16.37
    648.96 25.36 16.36 16.86 N33°E
    ZK2 420.90 11.13 8.71 10.93
    468.85 12.81 8.56 12.18
    516.10 20.37 13.35 13.40 N37°W
    531.53 16.80 12.43 13.80
    570.30 17.22 12.59 14.81 N32°W
    602.90 18.00 13.68 15.66
    612.00 19.25 13.10 15.89 N35°W
    630.00 20.83 14.57 16.36
    ZK3 163.40 7.87 5.12 4.32
    208.80 10.08 6.23 5.52
    245.10 10.40 7.55 6.48
    345.00 16.62 10.65 9.12 N70°W
    372.20 17.11 10.62 9.84 N62°W
    390.40 20.14 12.87 10.33
    426.70 14.90 10.43 11.29 N57°W
    454.00 15.90 10.83 12.01
    476.50 15.10 11.61 12.60
    485.30 18.64 12.48 12.84
    ZK4 410.69 15.20 9.96 10.67
    484.65 17.09 11.65 12.59 N31°W
    521.63 26.28 16.62 13.55
    558.61 18.38 12.91 14.51
    595.59 18.84 12.99 15.47 N28°W
    669.55 22.81 15.48 17.39
    743.51 24.05 16.26 19.31 N34°W
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