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Journal of Earth Science 2014年第4期25卷 676-688页

作者： xianghui qin Chengxuan Tan Qunce Chen Manlu Wu Chengjun Feng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement & Geohazard Ministry of Land and Resources

The crustal stress and seismic hazard estimation along the southwest segment of the Longmenshan thrust belt after the Wenchuan Earthquake was conducted by hydraulic fracturing for in-situ stress measurements in four boreholes at the Ridi, Wasigou, Dahegou, and Baoxing sites in 2003, 2008, and 2010. The data reveals relatively high crustal stresses in the Kangding region （Ridi, Wasigou, and Dahegou sites） before and after the Wenchuan Earthquake, while the stresses were relatively low in the short time after the earthquake. The crustal stress in the southwest of the Longmenshan thrust belt, especially in the Kangding region, may not have been totally released during the earthquake, and has since increased. Furthermore, the Coulomb failure criterion and Byerlee＇s law are adopted to analyzed in-situ stress data and its implications for fault activity along the southwest segment. The magnitudes of in-situ stresses are still close to or exceed the expected lower bound for fault activity, revealing that the studied region is likely to be active in the future. From the conclusions drawn from our and other methods, the southwest segment of the Longmenshan thrust belt, especially the Baoxing region, may present a future seismic hazard.

关键词： Wenchuan Earthquake Longmenshan thrust belt in-situ stress measurement crustal stress state Coulomb failure criterion seismic hazard.

Tectonic Stress State Changes Before and After the Wenchuan M_s 8.0 Earthquake in the Eastern Margin of the Tibetan Plateau

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 77-89页

作者： MENG Wen CHEN Qunce WU Manlu FENG Chengjun qin xianghui Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Institute of Geomechanics Chinese Academy of Geological Science

Crustal tectonic activities are essentially the consequences of the accumulation and release of in situ stress. Therefore, studying the stress state near active faults is important for understanding crustal dynamics and earthquake occurrences. In this paper, using in situ stress measurement results obtained by hydraulic fracturing in the vicinity of the Longmenshan fault zone before and after the Wenchuan Ms 8.0 earthquake and finite element modeling, the variation of stress state before and after the Wenchuan M. 8.0 earthquake is investigated. The results show that the shear stress, which is proportional to the difference between principal stresses, increases with depth and distance from the active fault in the calm period or after the earthquakes, and tends to approach to the regional stress level outside the zone influenced by the fault. This distribution appears to gradually reverse with time and the change of fault properties such as frictional strength. With an increase in friction coefficient, low stress areas are reduced and areas with increased stress accumulation are more obvious near the fault. In sections of the fault with high frictional strengths, in situ stress clearly increases in the fault. Stress accumulates more rapidly in the fault zone relative to the surrounding areas, eventually leading to a stress field that peaks at the fault zone. Such a reversal in the stress field between the fault zone and surrounding areas in the magnitude of the stress field is a potential indicator for the occurrence of strong earthquakes.

关键词： Wenchuan Ms 8.0 earthquake stress state in situ stress measurement finite elementmethod Longmenshan active fault zone

The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M_S 8.0 Earthquake

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Journal of Earth Science 2014年第5期25卷 861-870页

作者： Chengjun Feng Qunce Chen Chengxuan Tan xianghui qin Peng Zhang Wen Meng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement & Geohazard Ministry of Land and Resources

After the Wenchuan MS 8.0 Earthquake, which occurred on May 12, 2008, in Sichuan Province, China, we conducted a series of hydraulic fracturing stress measurements in three 200 m deep boreholes（ZK01, ZK02, and ZK03） drilled in Beichuan and Jiangyou regions near the northeastern segment of Longmenshan fault belt in 2009. These measurements revealed the near-surface stress field in the fault region one year after the Wenchuan MS 8.0 Earthquake. However, the lack of the stress measurements before the earthquake in the same region makes it difficult to understand variations of the in situ stress field（near-surface） by comparative analysis. In order to determine the unknown horizontal principal stresses before the earthquake in Beichuan and Jiangyou regions, the following research method was tentatively applied. Firstly, we calculate the static co-seismic stress field by linear elastic finite element numerical simulation with ANSYS, based on the co-seismic static displacement generated by the Wenchuan MS 8.0 Earthquake along the central Longmenshan fault plane in Beichuan and Jiangyou. Secondly, combining hydraulic fracturing measurements（after the earthquake） with the co-seismic stress（simulation）, the magnitudes and orientations of horizontal principal stresses before the earthquake were calculated. Finally, the variation of the in situ stress（near-surface） in Beichuan and Jinagyou, both before and after the Wenchuan MS 8.0 Earthquake, were obtained by comparative analysis. To do this the magnitude of SHmax was decreased on average by 13.01 and 6.54 MPa after the earthquake in ZK02 and ZK03, respectively and the magnitude of SHmin was decreased by 2.54 and 5.29 MPa in ZK02 and ZK03, respectively. Following the earthquake, the average direction of SHmax rotated anticlockwise by 42.5°.

关键词： Longmenshan fault belt hydraulic fracturing situ stress co-seismic stress numerical simulation.

Reexamining the Seismological Implications of the Present-day Stress State of the Yingxiu-Beichuan Fault after the Wenchuan Earthquake

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Acta Geologica Sinica(English Edition) 2016年第2期90卷 567-577页

作者： qin xianghui CHEN Qunce FENG Chengjun DU Jianjun WU Manlu MENG Wen SUN Dongsheng Institute of Geomechanics Chinese Academy of Geological Sciences Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources

The present-day stress state of the Yingxiu-Beichuan fault after the Wenchuan earthquake was re-estimated using measured in-situ stress data obtained after the Wenchuan earthquake. The results reveal that the gradient coefficients of principal stresses versus depth decrease from south to north along the Yingxiu-Beichuan fault, revealing that the stress level decreases from south to north. The consistency between the present-day stress levels and surface ruptures generated during the earthquake indicates that the accumulated tectonic stress beneath the Yingxiu-Beichuan fault before the Wenchuan earthquake was relieved in form of surface ruptures. This resulted in the stress remaining high in the southern section of the Yingxiu-Beichuan fault but relatively low in the northern section. Abnormal high pore pressure conditions and an extremely low frictional coefficient play important role in the interpretation of the stress field adjustment and seismic events observed after the Wenchuan earthquake along this fault, according to the estimation results using the Coulomb frictional-failure theory incorporating frictional coefficients ranging from 0.4 to 1.0. To accurately estimate the seismological hazard of the Yingxiu-Beichuan fault by analyzing fault instability using the Coulomb frictional-failure theory, much attention should be focused on the pore pressure conditions and the evolution state of the frictional coefficient under the present-day stress state.

关键词： stress state fault activity seismological hazard Coulomb frictional-failure theory Yingxiu-Beichuan fault

A Preliminary Study on the Present Crustal Stress of Northern South China Sea

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Acta Geologica Sinica(English Edition) 2015年第1期89卷 320-321页

作者： CHEN Qunce MENG Wen WU Manlu FAN Taoyuan ZHANG Chongyuan qin xianghui LI Guoqi Key Laboratory of Neotectonic Movement and Geohazard Ministry of Land and Resources Institute of Geomechanics Chinese Academy of Geological Science

The South China Sea （SCS） is the largest marginal sea in West Pacific formed by a combined effect of the Eurasian plate, Pacific plate and India-Australian plate, and is thus considered to be a unique natural laboratory to study oceanic dynamics and tectonic evolutions （Xie et al., 2006; Luan and Zhang, 2009）. Besides, the SCS contains enormous petroleum resources for its favorable conditions of oil-gas generation, accumulation and preservation. It is therefore imperative to intensively study the marine in-situ stress and its controlling factors of the SCS.

关键词： In FMI A Preliminary Study on the Present Crustal Stress of Northern South China Sea SCS

Selenium Enriched Trionyx sinensis : A New Choice for the Sustainable Development Model of Modern Agriculture

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Agricultural Biotechnology 2021年第6期10卷 62-63,78页

作者： Bo YANG Wei HUANG xianghui qin Jun YAN Chengde LIN Xiaofeng GAO Yinglan HUANG Yulin xianghui Breeding Co. Ltd.Yulin 537000China Yulin Academy of Agricultural Sciences Yulin 537000China Institute of Rural Revitalization Yulin Normal UniversityYulin 537000China Guangxi Wuwei Agricultural Technology Co. Ltd.Yulin 537000China

Based on the analysis of the current situation and existing problems of traditional Chinese soft shelled turtle(Trionyx sinensis)breeding industry,combined with the fact that selenium enriched functional agriculture is the future demand of mankind,this paper put forward the necessity of developing selenium enriched Chinese soft shelled turtles and promoting the sustainable development of modern agriculture:the development of selenium-enriched Chinese soft-shelled turtle is the need of the consumer market for food safety,the need to reduce the production cost of soft-shelled turtles and improve the production efficiency of soft-shelled turtles,the need to enrich the Chinese soft-shelled turtle market,and the need to promote the sustainable development of modern agriculture(fishery).

关键词： Functional agriculture Selenium enriched Trionyx sinensis Modern agriculture Sustainable development of agriculture Countermeasure

中国高放废物地质处置地下实验室场址深部岩体地应力测量及工程应用

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中南大学学报（自然科学版） 2021年第8期52卷 2634-2645页

作者：赵星光王驹秦向辉陈群策核工业北京地质院国家原子能机构高放废物地质处置创新中心北京100029 中国地质科学院地质力学研究所北京100081

为了给我国高放废物地质处置地下实验室工程设计提供应力边界条件,采用水压致裂法,在场址内部的4个钻孔中进行地应力测量,完成90段压裂试验和34段水压裂隙印模试验,根据测得的地应力及其方向,揭示场址应力场的分布特征。基于场址地应力... 详细信息

为了给我国高放废物地质处置地下实验室工程设计提供应力边界条件,采用水压致裂法,在场址内部的4个钻孔中进行地应力测量,完成90段压裂试验和34段水压裂隙印模试验,根据测得的地应力及其方向,揭示场址应力场的分布特征。基于场址地应力分布规律,结合室内测定的场址岩石启裂应力参数,根据地下实验室初步设计方案,进行地下实验室主体结构受力行为数值模拟。研究结果表明:场址岩体地应力随深度的增加表现出逐渐增大的趋势,在深度为60~600 m范围内,最大水平主应力(σH)小于25 MPa,与场址钻孔岩石的单轴压缩强度相比为低地应力水平。同时,σH普遍大于垂直应力(σv),表明场址地应力场主要受水平构造应力的控制。此外,所有测点的σH方向均为NE,优势方向为NEE,平均为N55°E,与北山预选区地壳运动速度矢量基本一致。获得了斜坡道、竖井和水平巷道启裂指标的分布特征,为完善试验巷道和硐室的布置方案提供了科学依据。

关键词：高放废物地质处置北山地下实验室场址地应力场启裂应力

日本M_W9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义探讨

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地学前缘 2015年第1期22卷 345-359页

作者：谭成轩胡秋韵张鹏丰成君秦向辉中国地质科学院地质力学研究所北京100081 国土资源部新构造运动与地质灾害重点实验室北京100081 中国地质调查局北京100037

为了探讨日本MW9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义,对华北和东北地区进行原位现今地应力绝对测量与实时监测、GPS测量,结果表明:日本大地震在山东半岛、华北北部地区和东北地区所诱发同震位移引起的张... 详细信息

为了探讨日本MW9.0级大地震前后华北和东北地区现今构造应力作用调整过程与研究意义,对华北和东北地区进行原位现今地应力绝对测量与实时监测、GPS测量,结果表明:日本大地震在山东半岛、华北北部地区和东北地区所诱发同震位移引起的张性效应调整周期分别约为6个月(即调整结束时间大约在2011年9月)、15个月(即调整结束时间大约在2012年6月)和26个月(即调整结束时间大约在2013年5月),张性效应调整周期与同震位移大小成正比。在这种调整过程中,往往表现出区域现今构造应力作用方式和构造应力场转换,并可能伴随重大地质事件(如地震等)的发生。2012年5月28日和29日、6月18日、8月26日及2013年1月11日在唐山及其周围地区分别发生的4.8级、3.2级、4.0级、3.3级和3.0级地震与华北北部地区构造应力作用方式和构造应力场转换有关,而2013年10月31日以来在吉林省松原市发生的地震群应与东北地区构造应力作用方式和构造应力场转换有关,而非一个大地震前的小震群。

关键词：原位现今地应力绝对测量与实时监测 GPS测量张性效应调整周期构造应力作用方式和构造应力场转换松原震群

鄂尔多斯地块西南缘宁夏固原地区原位地应力测量结果及其成因

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地质通报 2020年第7期39卷 983-994页

作者：王斌秦向辉陈群策孙东生中国地质科学院地质力学研究所北京100081 新构造运动与地质灾害重点实验室北京100081

鄂尔多斯地块西南缘新构造活动强烈、地震频发,具有复杂多样的构造变形模式和活动特征。为了解鄂尔多斯地块西南缘地壳浅部地应力分布规律及断层稳定性,利用宁夏固原地区的水压致裂地应力测量数据,结合其他实测及震源机制解资料,分析了... 详细信息

鄂尔多斯地块西南缘新构造活动强烈、地震频发,具有复杂多样的构造变形模式和活动特征。为了解鄂尔多斯地块西南缘地壳浅部地应力分布规律及断层稳定性,利用宁夏固原地区的水压致裂地应力测量数据,结合其他实测及震源机制解资料,分析了鄂尔多斯地块西南缘构造应力场特征。结果表明:①研究区2个钻孔的主应力关系整体表现为S H>S v>S h,水平应力起主导作用,属于走滑型应力状态,钻孔附近最大水平主应力方位平均为N59°W,与震源机制解获得的青藏高原东北缘主压应力方位有差异,推断鄂尔多斯地块西南缘现今NWW向走滑剪切应力环境的形成可能主要受到海原断裂带和六盘山断裂带的影响,应为局部构造和区域构造应力场共同作用的结果。②利用Mohr-Coulomb准则及Byerlee定律,摩擦系数取0.6~1.0,对研究区的现今地应力状态分析后发现,鄂尔多斯地块西南缘海原断裂带和六盘山断裂带的地应力大小未达到地壳浅部断层产生滑动失稳的临界条件,处于较稳定的应力状态。该研究成果为鄂尔多斯地块关键构造部位的断裂活动性分析和地质环境安全评价提供了参考依据。

关键词：鄂尔多斯地块水压致裂地应力测量海原断裂带六盘山断裂带

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东南沿海黄沙洞地热田地应力与控热构造研究

地球物理学报 2022年第10期65卷 3944-3961页

作者：范艳霞李海龙张军龙王强茂任天翔张敏黄少鹏秦向辉中国地质科学院深部探测中心北京100037 中国地震局地震预测研究所北京100036 广东省有色金属地质局九三五队广东惠州516001 深圳大学深地科学与绿色能源研究院广东深圳518060 中国地质科学院地质力学研究所北京100081

东南沿海地热资源丰富,但地热资源分布规律不清,其核心是对其控热构造的研究不足.为此本文选取位于惠州市的黄沙洞地热田为研究对象,开展了820.53 m深的水文地质钻探和五个层位的水压致裂法地应力测量、黄沙洞地热田及周边主要断裂的野... 详细信息

东南沿海地热资源丰富,但地热资源分布规律不清,其核心是对其控热构造的研究不足.为此本文选取位于惠州市的黄沙洞地热田为研究对象,开展了820.53 m深的水文地质钻探和五个层位的水压致裂法地应力测量、黄沙洞地热田及周边主要断裂的野外地质调查和遥感解译等工作.地应力测量结果表明黄沙洞地热田主应力方向为NWW-NNW向,最大、最小水平主应力随深度增加梯度系数分别为0.027和0.018.野外地质调查和遥感影像解译识别出了NE走向的潼湖-黄沙洞断裂带由西段的潼湖断裂和东段的黄沙洞断裂两条分支断裂共同组成.这两条分支断裂构成右阶斜列的展布样式,并具有右行走滑的运动学特征.在两条断裂的构造转换部位形成了黄沙洞拉分盆地,在现今的NWW-NNW向的主应力约束下,拉分盆地显示出NNE-NEE向的伸展运动特征.本文认为与拉分盆地相关的断层为地下水活动和热物质上涌提供通道,这应是本区最根本的控热构造.同时本文统计了广东省地热异常区的已有实测地应力数据与区域断裂带的空间对应关系,发现了NE-NEE的断裂带是东南沿海一带地热田发育的主控构造.本文以NE-NEE向区域性断裂带为核心开展精细的新构造调查研究,结合地球物理数据解析断裂带控热控水方式,该研究实例在东南沿海地热研究中具一定启示作用.

关键词：东南沿海黄沙洞地热田拉分盆地地应力测量控热构造

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