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    双滑脱层强度对博格达山北缘构造变形的影响:基于离散元数值模拟

    屈梦雪 程晓敢 田禾丰 陈汉林 于洪洲 陈昌锦 孙思瑶

    屈梦雪, 程晓敢, 田禾丰, 陈汉林, 于洪洲, 陈昌锦, 孙思瑶, 2023. 双滑脱层强度对博格达山北缘构造变形的影响:基于离散元数值模拟. 地球科学, 48(4): 1366-1378. doi: 10.3799/dqkx.2022.228
    引用本文: 屈梦雪, 程晓敢, 田禾丰, 陈汉林, 于洪洲, 陈昌锦, 孙思瑶, 2023. 双滑脱层强度对博格达山北缘构造变形的影响:基于离散元数值模拟. 地球科学, 48(4): 1366-1378. doi: 10.3799/dqkx.2022.228
    Qu Mengxue, Cheng Xiaogan, Tian Hefeng, Chen Hanlin, Yu Hongzhou, Chen Changjin, Sun Siyao, 2023. Effect of Double-Décollement Strength on Structure Deformation in Northern Bogda Mountain Using Discrete Element Numerical Simulation. Earth Science, 48(4): 1366-1378. doi: 10.3799/dqkx.2022.228
    Citation: Qu Mengxue, Cheng Xiaogan, Tian Hefeng, Chen Hanlin, Yu Hongzhou, Chen Changjin, Sun Siyao, 2023. Effect of Double-Décollement Strength on Structure Deformation in Northern Bogda Mountain Using Discrete Element Numerical Simulation. Earth Science, 48(4): 1366-1378. doi: 10.3799/dqkx.2022.228

    双滑脱层强度对博格达山北缘构造变形的影响:基于离散元数值模拟

    doi: 10.3799/dqkx.2022.228
    基金项目: 

    国家重点研发计划 2019YFC0605501

    国家自然科学基金 41720104003

    详细信息
      作者简介:

      屈梦雪(1998-),女,硕士研究生,主要从事褶皱冲断带构造研究.ORCID:0000-0002-0475-4059. E-mail:22038017@zju.edu.cn

      通讯作者:

      程晓敢,ORCID:0000-0002-0295-2158. E-mail: chengxg@zju.edu.cn

    • 中图分类号: P542

    Effect of Double-Décollement Strength on Structure Deformation in Northern Bogda Mountain Using Discrete Element Numerical Simulation

    • 摘要: 博格达山北缘褶皱冲断带以横向分段、纵向分层、多期构造变形叠加、先存构造发育为主要特征,发育有中侏罗统西山窑组和下侏罗统八道湾组两套滑脱层,为探究这两套滑脱层内聚力强度差异及先存构造对冲断带新生代构造变形的影响,研究采用离散元数值模拟方法,在布设先存构造的基础上设计了无滑脱层模型和不同内聚力强度组合的双滑脱层模型共5组数值模拟实验.实验结果表明:双滑脱层内聚力强度相同时,上滑脱层在应力传播中占据优势;双滑脱层内聚力强度不同时,应力会优先沿弱内聚力滑脱层传递,且当下滑脱层内聚力较弱时,上滑脱层可能不发挥作用.通过对比实验结果与实际地质剖面,认为先存构造控制了冲断带构造变形的总体样式,而两套滑脱层共同控制了冲断带纵向上的变形解耦,上部滑脱层内聚力弱于下部滑脱层是影响研究区新生代构造变形的关键性因素.

       

    • 图  1  博格达山西段地质构造简图

      F1.三工河断裂; F2.妖魔山断裂: F3.阜康断裂; A1.苦坝沟背斜; A2.七道湾背斜; A3.古牧地背斜;a.研究区的大地构造位置;b博格达山西段构造纲要简图,修改自Chen et al.(2015)马德龙等(2017)

      Fig.  1.  Simple geological map of west Bogda Mountain

      图  2  博格达山北缘综合地层柱状图

      修改自马德龙等(2017)Zhou et al.(2017)

      Fig.  2.  Comprehensive stratigraphic column of northern Bogda Mountain

      图  3  研究区典型剖面图

      剖面位置见图 1

      Fig.  3.  Typical geological profile of the study area

      图  4  实验初始模型设计

      图a~e分别代表实验1~5

      Fig.  4.  Pictures showing initial model design

      图  5  实验1模拟结果与构造解释

      Fig.  5.  Simulation results and structure explanation of Experiment 1

      图  6  实验2模拟结果与构造解释

      Fig.  6.  Simulation results and structure explanation of Experiment 2

      图  7  实验3模拟结果与构造解释

      Fig.  7.  Simulation results and structure explanation of Experiment 3

      图  8  实验4模拟结果与构造解释

      Fig.  8.  Simulation results and structure explanation of Experiment 4

      图  9  实验5模拟结果与构造解释

      Fig.  9.  Simulation results and structure explanation of Experiment 5

      图  10  模拟结果及体积应变对比

      a1、a2对应实验1;b1、b2对应实验2;c1、c2对应实验3;d1、d2对应实验4;e1、e2对应实验5

      Fig.  10.  Comparison of simulation results and volume strain

      表  1  离散元数值模拟实验参数

      Table  1.   Experimental parameters of discrete element numerical simulation

      地质单元 颗粒的细观参数 颗粒间的粘结参数 色标
      颗粒半径
      (m)
      剪切模量
      (109 Pa)
      泊松比 摩擦系数 密度
      (103 kg/m3
      杨氏模量
      (108 Pa)
      剪切模量
      (108 Pa)
      抗拉强度
      (107 Pa)
      剪切强度
      (107 Pa)
      能干层 60/80 2.9 0.2 0.3 2.5 2.0 2.0 2.0 4.0
      弱滑脱层 60/80 2.9 0.2 0.0 2.2 / / / /
      强滑脱层 60/80 2.9 0.2 0.1 2.2 / / / /
      断层 60/80 2.9 0.2 0.0 2.5 / / / /
      基底 60/80 2.9 0.2 0.4 2.5 2.0 2.0 2.0 4.0
      下载: 导出CSV
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    • 收稿日期:  2022-04-08
    • 刊出日期:  2023-04-25

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