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Piezomagnetic In-situ Stress Monitoring and its Application in the Longmenshan Fault Zone

Acta Geologica Sinica(English Edition) 2014年第5期88卷 1592-1602页

作者： zhang chongyuan WU Manlu CHEN Qunce LIAO Chunting Key Laboratory of Neotectonic Movement and Geohazard of Ministry of Land and Resources Institute of Geomechanics Chinese Academy of Geological Sciences

The relative change of in-situ stress is an inevitable outcome of differential movement among the crust plates. Conversely, changes of in-situ stress can also lead to deformation and instability of crustal rock mass, trigger activity of faults, and induce earthquakes. Hence, monitoring real-time change of in-situ stress is of great significance. Piezomagnetic in-situ stress monitoring has good and longtime applications in large engineering constructions and geoscience study fields in China. In this paper, the new piezomagnetic in-situ stress monitoring system is introduced and it not only has overall improvements in measuring cell＇s structure and property, stressing and orienting way, but also enhances integration and intelligence of control and data transmission system, in general, which greatly promotes installing efficiency of measuring probe and quality of monitoring data. This paper also discusses the responses of new piezomagnetic system in large earthquake events of in-situ stress monitoring station at Qiaoqi of Baoxing and Wenxian of Gansu. The monitoring data reflect adjustments and changes of tectonic stress field at the southwestern segment of and the northern area near the Longmenshan fault zone, which shows that the new system has a good performance and application prospect in the geoscience field. Data of the Qiaoqi stress-monitoring station manifest that the Lushan Earthquake did not release stress of the southwestern segment of the Longmenshan fault zone adequately and there still probably exists seismic risk in this region in the future. Combined with absolute in-situ stress measurement, carrying out long-term in-situ stress monitoring in typical tectonic position of important regions is of great importance for researchers to assess and study regional crust stability.

关键词： in-situ stress monitoring new piezomagnetic in-situ stress monitoring system theLongmenshan fault zone regional stress field dynamic changes

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A Superhydrophobic Hydrogel for Self-Healing and Robust Strain Sensor with Liquid Impalement Resistance

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Chinese Journal of Chemistry 2021年第12期39卷 3393-3398页

作者： Peng Wang Tao Chen Xuesong zhang Wei Duan chongyuan zhang Huilong Han Qing Xie School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBaodingHebei 071003China Hebei Key Laboratory of Electric Machinery Health Maintenance&Failure Prevention North China Electric Power UniversityBaodingHebei 071003China School of Electrical and Electronic Engineering North China Electric Power UniversityBaodingHebei 071003China

The superhydrophobic strain sensor is a fantastic direction,which could protect the strain sensor in harsh ***,the self-healing superhydrophobic strain sensor has not been *** this research,we developed a superhydrophobic strain sensor,which demonstrated excellent self-healing,mechanical robustness,and liquid impalement resistance *** key innovation is to partially embed hydrophobic graphene and carbon nanotubes into the hydrogel *** hodrogel substrate endows the sample with self-healing *** graphene,carbon nanotubes and hydrogel together lead to an accurate and real-time monitoring of human ***,the prepared sample demonstrated super-robust superhydrophobicity,which retained superhydrophobicity after many kinds of damage(such as 1000%stretch,10000 stretching-releasing cycles,hand-rub,tape-peeling,and high-speed drop/jet impact).

关键词： Hydrophobic effect Gels Graphene Strain sensor Self-healing

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Non-invasive sensing techniques to phenotype multiple apple tree architectures

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Information Processing in Agriculture 2023年第1期10卷 136-147页

作者： chongyuan zhang Sara Serra Juan Quiro´s-Vargas Worasit Sangjan Stefano Musacchi Sindhuja Sankaran Department of Biological Systems Engineering Washington State UniversityPullmanWA 99164USA Tree Fruit Research&Extension Center Washington State UniversityWenatcheeWA 98801USA Department of Horticulture Washington State UniversityPullmanWA 99164USA

Tree fruit architecture results from combination of the training system and pruning and thinning processes across multiple growth and development ***,the tree fruit architecture contributes to the light interception and improves tree growth,fruit quality,and fruit yield,in addition to easing the process of orchard management and *** tree architectural traits are measured manually by researchers or growers,which is labor-intensive and *** this study,the remote sensing techniques were evaluated to phenotype critical architectural traits with the final goal to assist tree fruit breeders,physiologists and growers in collecting architectural traits efficiently and in a standardized *** this,a consumer-grade red–green–blue(RGB)camera was used to collect apple tree side-images,while an unmanned aerial vehicle(UAV)integrated RGB camera was programmed to image tree canopy at 15 m above ground level to evaluate multiple tree fruit *** sensing data were compared to ground reference data associated with tree orchard blocks within three training systems(Spindle,V-trellis,Biaxis),two rootstocks(‘WA 38 trees grafted on G41 and M9-Nic29)and two pruning methods(referred as bending and click pruning).The data were processed to extract architectural features from ground-based 2D images and UAV-based 3D digital surface *** traits extracted from sensing data included box-counting fractal dimension(DBs),middle branch angle,number of branches,trunk basal diameter,and tree row volume(TRV).The results from ground-based sensing data indicated that there was a significant(P<0.0001)difference in DBs between Spindle and V-trellis training systems,and correlations between DBs with tree height(r=0.79)and total fruit yield per unit area(r=0.74)were significant(P<0.05).Moreover,correlations between average or total TRV and ground reference data,such as tree height and total fruit yield per unit area,were significant(P<0.05).With the r

关键词： Tree training systems Tree row volume Unmanned aerial vehicle Image analysis

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Dynamic response mechanism and precursor characteristics of gneiss rockburst under different initial burial depths

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Journal of Mountain Science 2024年第3期21卷 1004-1018页

作者： LIU Dongqiao SUN Jie MENG Wen HE Manchao zhang chongyuan LI Ran CAO Binghao State Key Laboratory for Tunnel Engineering China University of Mining and TechnologyBeijing 100083China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing 100081China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

To investigate the influence mechanism of geostress on rockburst characteristics,three groups of gneiss rockburst experiments were conducted under different initial geostress conditions.A high-speed photography system and acoustic emission(AE)monitoring system were used to monitor the entire rockburst process in real *** experimental results show that when the initial burial depth increases from 928 m to 1320 m,the proportion of large fracture scale in rockburst increases by 154.54%,and the AE energy increases by 565.63%,reflecting that the degree and severity of rockburst increase with the increase of burial *** then,two mechanisms are proposed to explain this effect,including(i)the increase of initial geostress improves the energy storage capacity of gneiss,and then,the excess energy which can be converted into kinetic energy of debris ejection increases,consequently,a more pronounced violent ejection phenomenon is observed at rockburst;(ii)the increase of initial geostress causes more sufficient plate cracks of gneiss after unloading ofσh,which provides a basis for more severe ejection of ***’s more,a precursor with clear physical meaning for rockburst is proposed under the framework of dynamic response process of crack ***,potential value in long term rockburst warning of the precursor obtained in this study is shown via the comparison of conventional precursor.

关键词： Traffic Engineering Gneiss Rockburst Crack propagation Excess energy Precursor characteristic

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Experimental study on the effect of unloading rate on gneiss rockburst

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2064-2076页

作者： Dongqiao Liu Jie Sun Ran Li Manchao He Binghao Cao chongyuan zhang Wen Meng State Key Laboratory for Tunnel Engineering China University of Mining and TechnologyBeijing100083China Key Laboratory of Active Tectonics and Geological Safety Ministry of Natural ResourcesInstitute of GeomechanicsChinese Academy of Geological SciencesBeijing100081China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China

Rockburst are often encountered in tunnel construction due to the complex geological *** study the influence of unloading rate on rockburst,gneiss rockburst experiments were conducted under three groups of unloading rates.A high-speed photography system and acoustic emission(AE)system were used to monitor the entire process of rockburst process in *** results show that the intensity of gneiss rockburst decreases with decrease of unloading rate,which is manifested as the reduction of AE energy and fragments ejection *** mechanisms are proposed to explain this effect:(i)The reduction of unloading rate changes the crack propagation mechanism in the process of *** makes the rockbursts change from the tensile failure mechanism at high unloading rate to the tension-shear mixed failure mechanism at low unloading rate,and more energy released in the form of shear crack ***,less strain energy is converted into kinetic energy of fragments ejection.(ii)Less plate cracking degree of gneiss has taken shape due to decrease of unloading rate,resulting in the destruction of rockburst incubation *** enlightenments of reducing the unloading rate for the project are also described *** rockburst magnitude is reduced from the medium magnitude at the unloading rate of 0.1 MPa/s to the slight magnitude at the unloading rate of 0.025 MPa/s,which was judged by the ejection velocity.

关键词： Rockburst Unloading rate Crack propagation Influence mechanisms

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Experimental and numerical investigation into the non-explosive excavation of tunnels

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第6期14卷 1885-1900页

作者： Quan zhang Zhigang Tao Chun Yang Shan Guo Manchao He chongyuan zhang Huiya Niu Chao Wang Shen Wang School of Mines China University of Mining and TechnologyXuzhouJiangsu221116China State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China School of Resources and Safety Engineering Central South UniversityChangsha410083China Department of Mining and Materials Engineering McGill UniversityMontrealQCH3A 0E8Canada Institute of Geomechanics Chinese Academy of Geological SciencesBeijing100081China College of Environmental Science and Engineering Ocean University of ChinaQingdao266100China School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo454003China

The use of explosives is restricted on some important holidays,and the handling of unexploded charge is very ***,an innovative non-explosive technology called instantaneous expansion(IE)was developed for ***,whose components are derived from solid wastes such as coal gangue and straw conduces to realizing the reuse of ***,its cost is lower than *** guns of IE are easy to treat with *** IE tunneling method is classified into two categories,*** with a single fracture(IESF)and IE with multiple fractures(IEMF),which are used to form the tunnel crosssection directionally cross-section and to fragment the rocks inside the cross-section,*** this study,the principle of IE tunneling was elaborated ***,tunneling experiments and numerical simulations were performed on IE,conventional blasting(CB)and shaped charge blasting(SCB)in *** experimental and numerical results show that IE achieved the best performance of directional rock breaking and corresponded to the most minor excavation-induced damage zone of the surrounding ***,the tunnel cross-section created by IE was flat and *** IE with CB and SCB,the over/under-excavation area decreased by 64%and 17%,and the excavation-induced damage zone fell by 26%and 11%,*** range of the loose circle is reduced,which is conducive to improving the long-term stability of the *** research provides a safe and economical tunneling method with excellent application prospects.

关键词： Instantaneous expansion(IE) Non-explosive Tunneling Smooth tunnel cross-section Excavation-induced damage zone

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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

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回火对Q960高强钢析出物和应变硬化行为的影响

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金属热处理 2018年第12期43卷 186-191页

作者：张宠元包头职业技术学院机械工程系

研究了回火温度对一种Q960工程机械用钢析出物和应变硬化行为的影响机理。经分析得出,低于650℃回火时,Q960钢呈现连续屈服,在650℃回火时拉伸曲线开始出现上屈服点,这与回火过程中位错结构、析出物和板条结构的演化有关。在拉伸速度恒... 详细信息

研究了回火温度对一种Q960工程机械用钢析出物和应变硬化行为的影响机理。经分析得出,低于650℃回火时,Q960钢呈现连续屈服,在650℃回火时拉伸曲线开始出现上屈服点,这与回火过程中位错结构、析出物和板条结构的演化有关。在拉伸速度恒定条件下,低碳贝氏体型Q960钢的真应力与真应变不遵循Hollomon关系;随着回火温度升高,初始应变硬化指数均降低;在均匀塑性变形阶段,随着真应变的增加,应变硬化指数逐渐下降,但应变硬化指数曲线的变化幅度减小,在高于550℃回火时应变硬化指数先降低然后增加,这种类型特征曲线的曲率变化的连续性和均匀塑性更好。

关键词：回火温度流变应力曲线 Crussard—Jaoult分析应变硬化行为

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热处理过程中TiAl合金材料的蠕变行为及机械寿命分析

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铸造技术 2015年第1期36卷 80-82页

作者：张宠元包头职业技术学院内蒙古包头014030

对两种组织形态Ti Al合金在热处理过程中的蠕变行为和机械寿命进行实验。在Walker应变理论基础上,利用数值模拟预测两种组织形态不同的Ti Al合金的机械寿命,建立新的机械寿命模型。结果表明,实验所得的机械寿命与利用Omega法所预测出的... 详细信息

对两种组织形态Ti Al合金在热处理过程中的蠕变行为和机械寿命进行实验。在Walker应变理论基础上,利用数值模拟预测两种组织形态不同的Ti Al合金的机械寿命,建立新的机械寿命模型。结果表明,实验所得的机械寿命与利用Omega法所预测出的寿命吻合很好。

关键词：组织形态 Ti Al合金蠕变行为机械寿命

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高地应力下深部岩芯饼化裂缝发展规律及机制研究

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岩石力学与工程学报 2022年第3期41卷 533-542页

作者：张丰收李猛利张重远何满潮张盛生衡德同济大学岩土与地下工程教育部重点实验室上海200092 同济大学土木工程学院上海200092 中国地质科学院地质力学研究所新构造与地质灾害重点实验室北京100081 中国矿业大学(北京)力学与建筑工程学院北京100083 青海省水文地质工程地质环境地质调查院青海西宁810008 四川长宁天然气有限责任公司四川成都610051

以青海共和盆地干热岩调查井的钻孔岩芯为研究对象,首先分析现场岩芯饼化侧面破坏特征、端面断口宏观和微观特征,然后基于三维离散-连续混合方法,分析不同类型应力状态下钻孔取芯过程中的裂缝扩展行为,从细观角度探究岩芯饼化形成机制... 详细信息

以青海共和盆地干热岩调查井的钻孔岩芯为研究对象,首先分析现场岩芯饼化侧面破坏特征、端面断口宏观和微观特征,然后基于三维离散-连续混合方法,分析不同类型应力状态下钻孔取芯过程中的裂缝扩展行为,从细观角度探究岩芯饼化形成机制。研究结果表明:(1)饼化岩芯侧面特征可分为破碎状、薄饼状、饼化状和厚饼状;端面断口形态可分为马鞍形、平面、杯状凹面和椭圆形,大多粗糙不平,具有凹凸性;(2)岩芯饼化侧重于拉伸破坏机制;(3)高水平主应力是岩芯饼化发生的主要因素,诱发带状分布裂缝并产生杯状凹面断口;垂向应力抑制裂缝带状分布,水平应力较小时,足够大的垂向应力可使岩芯产生平面断口;(4)在应力重分布作用下,岩芯根部产生大量裂缝,岩芯上部的已有裂缝也会继续发展,加剧岩芯饼化程度;(5)水平主应力差异性既影响裂缝的分布状态,也影响裂缝走向,裂缝走向倾向于沿最大水平主应力方向,且聚集分布在岩芯边缘附近区域;(6)裂缝走向分布受应力水平的影响,沿最大水平主应力走向裂缝比例随最小水平主应力的减小或垂向应力的增大而增加,较大的最大水平主应力会削弱裂缝走向对应力方向的指示作用。

关键词：岩石力学岩芯饼化离散–连续混合方法地应力裂缝扩展

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