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《地震研究》[ISSN:1000-0666/CN:53-1062/P]

卷:

45

期数:

2022年02期

页码:

329-339

栏目:

出版日期:

2022-05-20

文章信息/Info

Title:

Modeling the Coseismic Response Process of the Water Level to the 2014 Ludian M_S6.5 Earthquake:A Case Study of Huize Well

作者:

魏海滨¹; 2; 谷洪彪¹; 2; 孔慧敏¹; 2; 3; 迟宝明¹; 2; 3

(1.防灾科技学院,河北 三河 065201; 2.河北省地震动力重点实验室,河北 三河 065201; 3.中国地震局工程力学研究所,黑龙江 哈尔滨 150006)

Author(s):

WEI Haibin¹; 2; GU Hongbiao¹; 2; KONG Huimin¹; 2; 3; CHI Baoming¹; 2; 3

(1.Institute of Disaster Prevention,Sanhe 065201,Heibei,China)(2.Heibei Key Laboratory of Earthquake Dynamics,Sanhe 065201,Heibei,China)(3.Institute of Engineering Mechanics,China Earthquake Administration,Heilongjiang 150080,Harbin,China)

关键词:

会泽井;  鲁甸地震;  井水位;  同震响应;  数值模拟

Keywords:

Huize Well;  the Ludian earthquake;  water-level;  coseismic response;  numerical simulation

分类号:

P315.723

DOI:

10.20015/j.cnki.ISSN1000-0666.2022.0028

摘要:

为定量刻画地壳应力-应变改变、含水层孔压扰动及井孔水位变化之间的耦合过程,促进对近场地震水位同震响应机制的理解,利用多场耦合数值模拟方法,获得鲁甸地区(200×200)km²范围内,2014年鲁甸M_S6.5地震造成的同震静态应变场分布、孔压演化规律及会泽井水位响应曲线,并以渗透系数、杨氏模量及孔隙度为变量,设计6组不同模拟情景对影响研究区孔压演化的参数进行分析。结果表明:①鲁甸地震造成的同震静态应变场沿断层两侧呈四象限分布,应变场极值点分布在断层北段两侧,远离断层体应变数值逐渐减小; ②地震造成研究区含水层孔压扰动在50 d内恢复至震前稳定值,孔压的扩散时间受渗透系数及杨氏模量的影响; ③模拟所得会泽井水位受地震影响瞬时上升0.45 m,并在震后50 d内恢复至震前水位,水位变化趋势为阶升之后缓慢恢复,模拟水位与实测水位变化趋势相近。

Abstract:

In order to quantitatively characterize the coupling process of the variation of the water level in Huize Well with the variation of the crustal stress and strain,the disturbance of the pore pressure in the confined aquifer,and in order to deepen the understanding of the mechanism of the coseismic response of the near-field water level in the Well,a numerical simulation of multi-field coupling is used to obtain the coseismic static strain field,the evolution law of pore pressure,and the simulated curves of the water level in Huize Well caused by the 2014 Ludian M_S6.5 earthquake within the range of 200 km×200 km in Ludian region.Then,after the permeability coefficient(K),Young’s modulus(E)and porosity(n)are set as variables,six groups of different working conditions are designed to analyze the parameters affecting the evolution of pore pressure in the study area.The results show that:①The coseismic static strain field caused by the Ludian earthquake is distributed in four quadrants along both sides of the fault,and the extreme values of the strain field are distributed on both sides of the northern section of the fault,and the strain values gradually decrease when they are getting further away from the fault body; ②The disturbance of the pore pressure in the confined aquifer in the study area caused by the earthquake returns to the normal state in 50 days after the Ludian earthquake,and the diffusion time of the pore pressure is affected by the permeability coefficient(K)and Young’s modulus(E); ③The simulated water level in Huize Well rises by 0.45 m instantaneously due to the Ludian earthquake,and returns to a normal level 50 days after the earthquake.The simulated coseismic variation of the water level is similar to the actual coseismic variation of the water level in Huize well.

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备注/Memo

备注/Memo:

收稿日期:2022-02-22
基金项目:国家自然科学基金项目(41877205)和中国地震局地震科技星火计划项目(XH19070)联合资助.

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更新日期/Last Update: 2022-05-20