检索结果-南通市图书馆

A Damage Model of Acoustic Emission in Rock and Its Initial Application in Seismological Research

在线全文

学校读者我要写书评

暂无评论

Earthquake Research in China 1995年第1期9卷 56-63页

作者： qin siqing and Li ZaodingNortheast University of Technology,Shenyang 110006,China

The model of the relationship of AE parameter,damage variable and strain is derived by applying the damage theory and micro-element statistical strength *** relation between AE characteristics during rock failure and machine stiffness is analyzed under uniaxial compression with the above *** on the above analysis,the internal connection among AE activity law and seisraogenic process and earthquake activity is discussed.

关键词： Acoustic emission Damage model Uniaxial compression

在线全文

学校读者我要写书评

暂无评论

非线性库仑主动土压力分析理论

岩石力学与工程学报 2006年第12期25卷 2399-2406页

作者：秦四清李晓中国科学院地质与地球物理研究所北京100029

应用突变理论方法,研究当挡墙墙背竖直、光滑,且墙后土体由应变硬化介质与应变软化介质组成时,两种介质相互作用产生主动土压力的非线性理论。给出主动土压力产生的的充要力学条件判据,发现主动土压力的产生与两种不同介质的刚度比k和... 详细信息

应用突变理论方法,研究当挡墙墙背竖直、光滑,且墙后土体由应变硬化介质与应变软化介质组成时,两种介质相互作用产生主动土压力的非线性理论。给出主动土压力产生的的充要力学条件判据,发现主动土压力的产生与两种不同介质的刚度比k和材料的均匀性指标有极大关联性。当填土面水平且只有应变软化介质时,经典库仑和朗肯土压力理论只是非线性理论k=0的特例。研究结果表明:土压力强度σa随深度z的变化是非线性的关系:当k=0时,σa-z的关系是线性的;当应变硬化介质的剪切模量Gh较小时,σa-z关系呈近似线性关系;当Gh较大时,σa-z关系为明显的非线性关系。σa-z关系理论曲线与土压力模型试验和实测结果具有很好的一致性。

关键词：土力学主动土压力应力-应变性质刚度比材料均匀性指标非线性

A quantitative criterion to describe the deformation process of rock sample subjected to uniaxial compression:From criticality to final failure

在线全文

学校读者我要写书评

暂无评论

A quantitative criterion to describe the deformation process...

A Potential Strain Indicator for Brittle Failure Prediction of Low-porosity Rock:Part I-Experimental Studies Based on the Uniaxial Compression Test

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Lei Xue siqing qin Qiang Sun Yuanyuan Wang Haitao Qian Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences School of Resources and Geosciences China University of Mining and Technology Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Institute of Crustal Dynamics China Earthquake Administration

It was found that the crack damage stress threshold,σ,is a phase transition point during the deformation process of rock and is equivalent to the unstable fixed point of renormalization group ***,a relationship exists between the renormahzation group theory and the rock deformation process,through which we can investigate the critical behavior of rock ***,an improved renormahzation group model,which takes into account the different stress transfer mechanisms that are closer to the actual mechanical processes,is introduced to reveal the critical behavior of the rock deformation ***,a quantitative relationship between the crack damage stress threshold and peak strength,σ/σ*** theoretically *** test the theoretical relationship we additionally present experimental results of an investigation of the ratio of the crack damage stress threshold to uniaxial compressive strength,σ/σ,based on different rock *** results show that the overall average and standard deviation of σ/σis 0.80(±0.10) for low-porosity igneous,metamorphic and sedimentary rocks,a figure that is closer to the theoretical solution of σ/σfrom the improved renormahzation group model with a stress transfer mechanism of STM — 1/*** study implies that theσ/σratio may be intrinsic to low-porosity rocks,and therefore can be considered as a reliable predictor of the peak strength of rock samples in the laboratory.

关键词： Uniaxial compression test Rock deformation process Crack damage stress threshold Renormalization group theory Stress transfer mechanism

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Potential Strain Indicator for Brittle Failure Prediction ...

中国科学院地质与地球物理研究所2015年度（第15届）学术年会

作者： Lei Xue Meng Qi siqing qin Guoliang Li Pei Li Miaomiao Wang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of Sciences Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences North China University of Water Resources and Electric Power

In this paper,we have investigated the quantitative relationship between the axial strain threshold at the volumetric strain reversal point(ε)and the strain threshold at the peak stress(ε)during the uniaxial compression *** found that normalized values ofε/εfor different rock types are typically.34(±0.24).This is especially true for igneous and metamorphic rocks,or low-porosity sedimentary *** verify this finding,we investigated seven granitic gneiss samples using the uniaxial compression *** results were consistent with the above *** inferred thatε/εmay be an intrinsic property of low-porosity rocks,and may be a potential indicator for predicting failure strains in laboratory-scale rock samples.

关键词： Uniaxial compression test Strain threshold Volumetric strain reversal point Failure prediction Igneous rock Metamorphic rock Sedimentary rock

来源： cnki会议 cnki会议评论

在线全文

学校读者我要写书评

暂无评论

崩滑灾害临界位移演化的指数律

岩石力学与工程学报 2010年第5期29卷 873-880页

作者：秦四清王媛媛马平中国科学院地质与地球物理研究所工程地质力学重点实验室北京100029

基于锁固段概念和重正化群理论,从新的思路和视角出发,提出崩滑灾害临界位移演化的2个指数律,发现斜坡失稳的临界位移与加速蠕变起点的位移和锁固段的个数有关。第一律适用于斜坡的脆性破坏分析,例如岩崩、滚石和岩体倾倒破坏;第二律适... 详细信息

基于锁固段概念和重正化群理论,从新的思路和视角出发,提出崩滑灾害临界位移演化的2个指数律,发现斜坡失稳的临界位移与加速蠕变起点的位移和锁固段的个数有关。第一律适用于斜坡的脆性破坏分析,例如岩崩、滚石和岩体倾倒破坏;第二律适用于斜坡的蠕变破坏分析预测,例如岩滑、堆积层滑坡、黄土滑坡以及含锁固段的黏土滑坡。多个典型滑坡实例分析表明上述指数律的广泛适用性与可应用性。所提出的方法能够在崩滑灾害的中期、短期及临阵预报方面发挥作用。

关键词：边坡工程崩滑指数律锁固段位移加速蠕变

2017年伊拉克M_W7.3地震的类型界定及其震后趋势分析

在线全文

学校读者我要写书评

暂无评论

地球物理学报 2018年第2期61卷 616-624页

作者：杨百存秦四清薛雷张珂中国科学院地质与地球物理研究所中国科学院页岩气与地质工程重点实验室北京100029 中国科学院地球科学研究院北京100029 中国科学院大学北京100049

2017年伊拉克地震发生在我们划分的巴格达地震区,鉴于不同机构提供的该震震级参数相差较大,本文利用孕震断层多锁固段脆性破裂理论,分情况讨论了该震所属地震类型,并分析了巴格达地震区地震趋势.结果表明:若2017年伊拉克地震为M_W7.3,... 详细信息

2017年伊拉克地震发生在我们划分的巴格达地震区,鉴于不同机构提供的该震震级参数相差较大,本文利用孕震断层多锁固段脆性破裂理论,分情况讨论了该震所属地震类型,并分析了巴格达地震区地震趋势.结果表明:若2017年伊拉克地震为M_W7.3,则该震为第3锁固段向峰值强度点演化过程中发生的1次显著前震,该区未来将发生M_W7.7~8.2(双震型为M_W7.5~8.0)标志性地震,目前已接近临界状态;若2017年伊拉克地震为M_W7.5,除可能为显著前震外,还可能为标志性地震(双震)之一,若如此两年内该区将发生另一次M_W7.5地震;若2017年伊拉克地震为MS7.8,则该震为第3锁固段峰值强度点对应的标志性地震,与我们对该震的前瞻性中长期预测结果相符.我们判断该震不为主震,预测该区未来还将发生M_W7.8~8.3(双震型为M_W7.6~8.1)标志性地震,目前该区远离临界状态.

关键词： 2017年伊拉克地震多锁固段层次结构地震类型震后趋势

A Study on Crack Damage Stress Thresholds of Different Rock Types Based on Uniaxial Compression Tests

在线全文

学校读者我要写书评

暂无评论

A Study on Crack Damage Stress Thresholds of Different Rock ...

New quantitative displacement criteria for slope deformation process:From the onset of the accelerating creep to brittle rupture and final failure

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Lei Xue siqing qin Qiang Sun Yuanyuan Wang Lee Min Lee Weichao Li Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences School of Resources and Earth Science China University of Mining and Technology Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Faculty of Engineering and Science Universiti Tunku Abdul Rahman

When rock samples are loaded until macroscopic fractures develop,the failure process can be divided into several stages based on axial and lateral strain responses or the acoustic emission sequence during uniaxial compression *** stress thresholds may be identified:the crack closure stress σ,crack initiation stress σ,crack damage stress crc(j,and uniaxial compressive strength σ;these may be used as a warning indicator for rock *** investigated the crack damage stressσ,its threshold,and a possible relationship between σand the uniaxial compressive *** σ of different rock types were compiled from previous studies based on uniaxial compression *** results showed that the overall averages and standard deviations of σ/σ f°r igneous,metamorphic,and sedimentary rocks were 0.78(±0.11),.85(±0.11),and.73(±0.18),*** were no significant differences in σ/σ between the different rock types,except that the sedimentary rock had a slightly larger standard deviation attributed to the variation of porosity in the samples,while the metamorphic rock had higher average σ/σ resulting from the small statistical sample *** excluding the higher-porosity(>10%) rock samples,the averages and standard deviations of σ/σ for igneous,metamorphic,and sedimentary rocks were .78(±0.09),.85(±0.09),and.78(±0.11),*** results imply that the rock origin process(i.e.,igneous,metamorphic,and sedimentary) has a minimal effect on σ/σ.The ratio σ/σ could be an essential intrinsic property for lowporosity rocks,which could be used in rock engineering for predicting the failure process.

关键词： Crack damage stress threshold Uniaxial compression test Deformation process Igneous rock Metamorphic rock Sedimentary rock

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

New quantitative displacement criteria for slope deformation...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Lei Xue siqing qin Pei Li Guoliang Li Ibrahim Adewuyi Oyediran Xiaohua Pan Key Laboratory of Shale Gas and Geoengineering Institute of Geology and Geophysics Chinese Academy of Sciences Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences Department of Geology Faculty of ScienceUniversity of Ibadan College of Civil Engineering and Architecture Zhejiang University

Two quantitative displacement criteria for slope deformation were deduced through the combination of a onedimensional renormalization group model and the strain-softening constitutive model of geological *** criteria can be used to understand the mechanical process from the onset of the accelerating creep on a slope,through brittle rupture,to the final failure and *** study showed that according to the first criterion,the displacement ratio between the brittle rupture and the onset of the accelerating creep is approximately 1.48,which can be used to predict the brittle rupture of a slope with continuous progressive *** second displacement criterion shows that the displacement ratio between the final failure and the onset of the accelerating creep is approximately 2.59,which can be used to predict the occurrence of the ultimate ***,the critical displacement prior to the failure of the slope can be predicted using a time series of monitoring displacement *** methodology proposed in this study was validated using data from two well-known landslides,the Vajont landslide in Italy and the Xintan landslide in *** results verify the applicability of this method.

关键词： Vajont landslide Xintan landslide Failure prediction Creep Quantitative displacement criterion Renormalization group

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

以边坡为例论工程地质活动中地下水的问题

路基工程 2008年第3期 10-12页

作者：孙强秦四清马平中国科学院地质与地球物理研究所北京100029

目前关于地下水与岩土的关系和相互作用以及由地下水诱发的工程事故和地质灾害的研究不足,不能满足工程建设的需要。笔者在总结地下水的工程影响和其诱发的主要工程地质问题的基础上以滑坡为例,提出了建议。

关键词：地下水地面沉降滑坡变形机制地质力学