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中核甘肃核技术产业园预选厂址区地应力测量研究

陈利忠 洪波 张全锋 曾联波 邱君 李冉 代进雄

陈利忠, 洪波, 张全锋, 等, 2017. 中核甘肃核技术产业园预选厂址区地应力测量研究. 地质力学学报, 23 (3): 475-486.
引用本文: 陈利忠, 洪波, 张全锋, 等, 2017. 中核甘肃核技术产业园预选厂址区地应力测量研究. 地质力学学报, 23 (3): 475-486.
CHEN Li-zhong, HONG Bo, ZHANG Quan-feng, et al., 2017. A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE. Journal of Geomechanics, 23 (3): 475-486.
Citation: CHEN Li-zhong, HONG Bo, ZHANG Quan-feng, et al., 2017. A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE. Journal of Geomechanics, 23 (3): 475-486.

中核甘肃核技术产业园预选厂址区地应力测量研究

基金项目: 

国家科技重大专项项目 2016ZX05034003-002

中国地质科学院地质力学研究所基本科研业务费 DZLXJK201706

详细信息
    作者简介:

    陈利忠(1992-), 男, 硕士研究生, 主要从事地应力测量技术及应用研究。E-mail:13261983298@163.com

    通讯作者:

    洪波(1973-), 男, 高级工程师、注册土木工程师(岩土), 主要从事岩土工程勘察研究。E-mail:593604110@qq.com

  • 中图分类号: P315.727

A STUDY ON IN-SITU STRESS MEASUREMENT IN A CANDIDATE SITE FOR CNNC NUCLEAR TECHNOLOGY INDUSTRIAL PARK IN GANSU PROVINCE

  • 摘要: 为更科学地指导中核甘肃核技术产业园的选址工作,需对预选厂址工程区范围内岩体的地应力状态及分布规律进行分析研究。在预选厂址工程区内对2个450m深的钻孔开展水压致裂原地应力测试,并采用了4种方法进行关闭压力处理来保证主应力值的可靠性和准确性。压裂测试结果表明,工程区内最大水平主应力值6.66~25.91 MPa,最小水平主应力值3.94~15.76 MPa,水平主应力和垂直应力关系为SH > Sh > Sv,揭示工程区内水平应力作用占主导,利于逆断层活动。印模测试结果显示最大水平主应力优势方位为NE方向,与区域构造应力场方向基本吻合。基于实测数据计算KavKHvKHhμmτm这5种应力状态特征参数,并利用库伦摩擦滑动准则分析预选厂址区断层活动性,进而综合评价预选厂址区的应力场特征及其对岩体工程稳定性的影响。

     

  • 图  1  工程区所在区域大地构造图

    Figure  1.  Regional geotectonic map of the project site

    图  2  F1断层平面展布图

    Figure  2.  Plane distribution diagram of F1 fault

    图  3  ZK1钻孔376.90 m测段结果图

    a-压力时间曲线 b-水压裂隙印痕 c-印模处理结果图

    Figure  3.  The results of the 376.90 m test-interval in ZK1 borehole

    图  4  基于4种方法的关闭压力判定

    a-单切线法; b-dt/dβ法; c-dβ/dt法; d-Muskat法

    Figure  4.  Determinations of shut-in pressure using 4 methods

    图  5  工程区岩体水平主应力值随深度变化规律

    a-ZK1和ZK2钻孔水平应力值随深度的变化; b-工程区的主应力随深度分布特征

    Figure  5.  Variation of horizontal principal stress values as the depth in the rock mass of the project site

    图  6  工程区KavKHvKHhμm值随深度分布特征图

    Figure  6.  Distribution pattern of KavKHvKHhμm as the depth in the project site

    图  7  工程区最大水平主应力方向随深度的分布特征图

    Figure  7.  Distribution pattern of the maximum horizontal stress orientations as the depth in the project site

    图  8  工程区周边区域现今构造应力场图[33]

    (注:红五角星为工程区所在位置)

    Figure  8.  Tectonic stress fields in the project site and surrounding areas

    图  9  工程区断层稳定性分析结果

    Figure  9.  Analysis results of fault stability in the project site

    表  1  工程区水压致裂原地应力测试结果

    Table  1.   Geostress measurement results of the project site using hydraulic fracturing method

    钻孔 深度(m) 压裂参数(MPa) 应力值(MPa) 方位(°)
    Pb Pr Ps PH Po SH Sh Sv
    ZK1 156.70 9.48 4.39 3.85 1.59 0.77 6.66 3.94 4.23 N12°E
    161.00 10.22 5.50 5.97 1.62 0.81 11.00 5.97 4.35
    175.80 14.97 11.83 11.93 1.81 0.96 22.82 11.93 4.75
    195.80 13.60 8.71 7.38 2.00 1.16 12.06 7.38 5.29 N22°E
    225.60 21.87 17.09 10.73 2.28 1.46 13.10 10.73 6.09
    227.00 22.22 16.59 11.40 2.29 1.47 15.27 11.40 6.13
    229.00 17.72 12.46 10.51 2.30 1.49 17.16 10.51 6.18
    233.40 15.92 9.74 9.75 2.38 1.53 17.68 9.75 6.30 N19°E
    252.50 13.69 10.48 8.26 2.56 1.73 12.99 8.26 6.82
    308.50 17.37 14.93 12.30 3.13 2.29 19.68 12.30 8.33
    358.00 16.77 14.06 12.03 3.60 2.78 19.37 12.03 9.67 N38°E
    376.90 21.81 15.74 14.76 3.79 2.97 25.57 14.76 10.18 N53°E
    431.50 24.99 17.85 15.76 4.33 3.52 25.91 15.76 11.65 N40°E
    ZK2 250.70 16.63 13.03 10.64 2.54 1.51 17.41 10.64 6.77
    252.90 15.74 8.41 9.18 2.54 1.53 17.36 9.18 6.83 N56°E
    267.40 10.51 8.71 7.69 2.73 1.67 13.29 7.69 7.22
    270.40 21.19 13.93 10.54 2.73 1.70 15.99 10.54 7.30 N22°E
    333.20 34.45 22.05 15.33 3.39 2.33 21.61 15.33 9.00
    351.50 32.72 17.22 13.09 3.57 2.52 19.53 13.09 9.49
    368.50 18.61 13.65 12.61 3.76 2.69 21.49 12.61 9.95
    376.50 30.21 15.15 13.61 3.79 2.77 22.91 13.61 10.17 N52°E
    397.50 23.28 12.26 12.63 4.05 2.98 22.44 12.63 10.73
    411.50 21.05 13.22 12.94 4.14 3.12 22.48 12.94 11.11 N44°E
    注:Pb—岩石原地破裂压力; Pr—破裂面重张压力; Ps—破裂面关闭压力; PH—静水柱压力; Po—孔隙压力; SH—最大水平主应力; Sh—最小水平主应力; Sv—根据上覆岩石埋深计算的垂向主应力(岩石密度取2.70 g/cm3)。
    Note: Pb-Fracture pressure; Pr-Reopening pressure; Ps-Shut-in pressure; PH-Hydrostatic column pressure; Po-Pore pressure; SH-Maximum horizontal principal stress; Sh-Minimum horizontal principal stress; Sv-Vertical principal stress estimated according to the depth of the overlying rock(the mean rock density is 2.70 g/cm3)
    下载: 导出CSV

    表  2  不同地区SHSh随深度变化规律情况

    Table  2.   Variation of SHSh as the depth in different regions

    地区 SH Sh 统计方法
    本工程区 0.0468H+4.542 0.0282H+2.894
    北山新场区 0.0259H+3.097 0.0177H+2.099 赵星光等[24], 修改
    中国大陆 0.0229H+4.738 0.0171H+1.829 杨树新等[27]
    西域地块 0.0203H+6.931 0.0103H+5.217 杨树新等[27]
    下载: 导出CSV

    表  3  应力状态参数计算结果

    Table  3.   Calculation results of the stress state parameters

    钻孔 深度(m) 应力状态参数
    Kav KHv KHh μm τm
    ZK1 156.70 1.25 1.57 1.69 0.26 1.36
    161.00 1.95 2.53 1.84 0.48 2.52
    175.80 3.66 4.80 1.91 0.70 5.45
    195.80 1.84 2.28 1.63 0.45 2.34
    225.60 1.96 2.15 1.22 0.43 1.19
    227.00 2.18 2.49 1.34 0.50 1.94
    229.00 2.24 2.78 1.63 0.54 3.33
    233.40 2.18 2.81 1.81 0.54 3.97
    252.50 1.56 1.90 1.57 0.38 2.37
    308.50 1.92 2.36 1.60 0.48 3.69
    358.00 1.62 2.00 1.61 0.41 3.67
    376.90 1.98 2.51 1.73 0.52 5.41
    431.50 1.79 2.22 1.64 0.47 5.08
    ZK2 250.70 2.07 2.57 1.64 0.50 3.39
    252.90 1.94 2.54 1.89 0.50 4.09
    267.40 1.45 1.84 1.73 0.35 2.80
    270.40 1.82 2.19 1.52 0.44 2.73
    333.20 2.05 2.40 1.41 0.49 3.14
    351.50 1.72 2.06 1.49 0.42 3.22
    368.50 1.71 2.16 1.70 0.44 4.44
    376.50 1.80 2.25 1.68 0.46 4.65
    397.50 1.63 2.09 1.78 0.43 4.91
    411.50 1.59 2.02 1.74 0.42 4.77
    注:KavKHv—侧压系数; KHh—水平最大最小主应力值比; μm—剪应力相对大小; τm—水平面内最大剪应力
    Note: KavKHv-Side pressure coefficient; KHh-Ratio of maximum to minimal horizontal principal stress; μm-Relative magnitude of the shear stress; τm-Maximum shear stress
    下载: 导出CSV
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  • 收稿日期:  2017-01-10
  • 刊出日期:  2017-06-01

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