郯庐断裂带宿迁段合欢路土壤氡分布特征与迁移特征的数值模拟

戴波; 赵启光; 张敏; 张扬; 周晓成

doi:10.11899/zzfy20210123

郯庐断裂带宿迁段合欢路土壤氡分布特征与迁移特征的数值模拟

doi: 10.11899/zzfy20210123

1.
江苏省地震局，南京 210000
2.
中国地震局地震预测研究所，北京 100036

基金项目: 宿迁市活动断层探测与地震危险性项目（SQZBTB20110162）；江苏省产业前瞻与关键核心技术-竞争项目（BE2020116）；2021年度第一批江苏省地方标准项目（124）

详细信息

作者简介:
戴波，男，生于1987年。工程师。主要从事断裂带地球化学与地震活动性方面的研究。E-mail：okman310@foxmail.com

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出版历程
- 收稿日期: 2020-07-07
- 网络出版日期: 2021-07-12
- 刊出日期: 2021-03-01

Numerical Simulation of Radon Concentration in Soil of Hehuan Road in Tan Lu Fault Suqian Segment

1.
Earthquake Administration of Jiangsu Province, Nanjing 210000, China
2.
Institute of Earthquake Science, China Earthquake Administration, Beijing 100036, China

摘要

摘要: 沿郯庐断裂带宿迁段合欢路布设土壤氡测线并对测得的数据进行分析研究，结果表明研究区域内土壤氡探测结果对断裂带位置、断层类型和特征有较好的指示性。在已知场地地质构造参数、地层岩性特征的基础上，建立土壤氡迁移模型。建立模型时识别了断裂类型和覆盖层分层特征，并讨论了断层内部结构与氡浓度取值，使模型与实际情况相等。数值模拟结果印证了土壤氡异常峰区间在圈定断裂位置和断层破碎带中的重要作用，揭示了氡在不同覆盖层中的迁移速度，并定量解释了合欢路场地断层土壤氡异常的成因。
- 土壤氡 /
- 氡迁移 /
- 郯庐断裂带 /
- 活动断层 /
- 数值模拟
Abstract: Based on the known geological structural parameters and stratigraphic lithology characteristics of the HeHuan road in the Suqian section of the Tan Lu fault, a model of soil radon migration is established. The type of fracture and the layered characteristics of overburden are identified during the model establishment, and we discussed the internal structure of the fault and the radon concentration.This makes the model more consistent with the actual situation.The calculated numerical simulation results are very close to the measured radon curve in soil. The result quantitatively explains the main causes of anomalies in soil radon measurement. It’s confirmed that the abnormal form of soil radon is mainly determined by geological structure, the abnormal values are related to the concentration of cross section and the characteristics of overburden rock formation, the migration velocity of radon in different overburden is different, the range of abnormal soil radon peak can indicate the position of breakpoint and the range of relative fracture.
- Soil radon /
- Radon migration /
- TanLu fault /
- Active fault /
- Numerical simulation

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图 1 活断层上氡迁移的物理模型

Figure 1. Physical model of radon migration in active fault

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图 2 郯庐断裂带宿迁段地质构造图

Figure 2. Geological structure map of the Tanlu fault Suqian segment

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图 3 合欢路场地位置图

Figure 3. Location of Hehuan road

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图 4 合欢路测线土壤氡浓度、CO₂浓度

Figure 4. Soil radon and carbon dioxide survey line of Hehuan road

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图 5 合欢路土壤氡迁移模型

Figure 5. Radon migration mode of Hehuan Road

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图 6 F_5-2断层土壤氡迁移数值模拟

Figure 6. Numerical simulation of soil radon migration in fault F_5-2

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图 7 F_5-1断层土壤氡迁移数值模拟

Figure 7. Numerical simulation of soil radon migration in fault F_5-1

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表 1 覆盖层中氡迁移相关参数

Table 1. Parameters related to radon migration in overburden

土壤性质	孔隙度e/%	扩散系数D/10⁻² cm²·s⁻¹	有效扩散系数D^*/cm²·s⁻¹	对流速度V/10⁻⁴ cm·s⁻¹
砂	40.0	4.50～7.00	0.110～0.175	8.0
疏松沉积物	20.0	2.00～2.50	0.100～0.125	6.8
白黏土	59.3	1.53	0.023	4.0
砂质黏土	10.8	1.09	0.100	4.2

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表 2 土壤氡测线探测结果与浅层人工地震探测结果

Table 2. Detection results of soil radon line and shallow seismic

土壤氡测线分段名称	测线长度 /m	最大值 /kBq·m⁻³	最小值 /kBq·m⁻³	平均值 /kBq·m⁻³	异常下限 /kBq·m⁻³	异常形态	异常峰区间间距/m	异常区间 /m	浅层人工地震测线	分支断裂编号	断点位置 /m	断错性质	倾向倾角/°	上断点埋深/m
SG1	360	1.09	1.09	9.40	23.46	单峰	－	1490～1545	S	F_5-2	1508	正断	E70	6
SG2	360	0.99	0.99	4.11	7.77	双峰	23	1970～2022	S	F_5-1	1988	正断	W65	18

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表 3 断点上覆盖层参数

Table 3. Overburden parameters on fault point

断点	断点上覆盖层参数
断点	覆盖层	深度/m	厚度/m	描述	对流速度/cm·s⁻¹	有效扩散系数/cm²·s⁻¹
断裂F_5～2断点	1	0～4	4	灰黑、灰黄色黏土，质软	4.5	0.06
	2	4～10	6	黄棕、青灰色条纹砂质黏土，含有锰结核和姜结石	6.0	0.11
	3	10～24	14	黄棕、青灰色黏土	4.0	0.05
	4	24～32	8	黄棕、灰黄色砂质黏土	5.0	0.08
断裂F_5-1断点	1	0～2.0	2	灰黑色，黑色黏土，质软	4.5	0.06
	2	2.0～3.8	1.8	棕红色，局部有灰色粗砂质黏土，含有钙质结核	6.0	0.11
	3	3.8～4.5	0.7	青灰色粉砂质黏土，质软	5.0	0.08
	4	4.5～5.8	1.3	棕色、褐棕色黏土，含有铁锰结核	4.0	0.04

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