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Fracture evolution analysis of soil-rock mixture in contrast with soil by CT scanning under uniaxial compressive conditions

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Science China(Technological Sciences) 2021年第12期64卷 2771-2780页

作者： SUN XiuKuo li Xiao MAO TianQiao ZHENG Bo WU YanFang li guanfang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing 100029China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China

Soil-rock mixture(SRM),as a type of extremely heterogeneous geomaterial,is very common in nature and *** fracture and damage of SRM often induce severe geological ***,it is important to analyze the fracture evolution process of this *** the present research,real-time computed tomography(CT)scanning was conducted on SRM and pure soil samples under uniaxial compressive experiments to investigate the influence of rocks on fracture evolution in *** initiation of cracks,the original values of,and variations in,average density and heterogeneity in the soil matrix,the crack width evolution during loading,and the final failure modes were all *** with a width greater than 0.1 mm will not arise until over 90%of ultimate stress is *** general,in SRM,areas where the initial average density of the soil matrix is smaller and the initial heterogeneity is greater,are much easier to crack,but the results for pure soil show the opposite *** to fracturing conditions shown in CT slices,fracturing and non-fracturing areas in the soil matrix were *** average density of the soil matrix decreases in all areas under loading,except non-fracturing areas in *** the whole sample,the increase in heterogeneity in the soil matrix of SRM is greater than that of pure soil;but for the fracturing areas,this increase in pure soil is ***,the average and standard deviations of crack width both follow logarithmic distributions with high correlation coefficients.

关键词： soil-rock mixture fracture evolution real-time CT scanning CT value crack width

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Contributions of non-tectonic micro-fractures to hydraulic fracturing—A numerical investigation based on FSD model

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Science China Earth Sciences 2016年第4期59卷 851-865页

作者： WANG Yu li Xiao ZHAO ZhiHeng ZHOU RunQing ZHANG Bo li guanfang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and Geophysics Chinese Academy of Sciences

Shale gas has been discovered in the Upper Triassic Yanchang Formation, Ordos Basin, China. Due to the weak tectonic activities in which the shale plays, core observations indicate abundant random non-tectonic micro- fractures in the producing shales. The non-tectonic micro-fractures are different from tectonic fractures and are characterized by being irregular, curved, discontinuous, and randomly distributed. The role of micro-fractures in hydraulic fracturing for shale gas development is currently poorly understood yet potentially critical. Two-dimensional computational modeling studies have been used in an initial attempt toward understanding how naturally random fractured reservoirs respond during hydraulic fracturing. The aim of the paper is to investigate the effect of random non-tectonic fractures on hydraulic fracturing. The numerical models with random non-tectonic micro-fractures are built by extracting the fractures of rock blocks after repeated heating and cooling, using a digital image process. Simulations were conducted as a function of:(1) the in-situ stress ratio;(2) internal friction angle of random fractures;(3) cohesion of random fractures;(4) operational variables such as injection rate; and(5) variable injection rate technology. A sensitivity study reveals a number of interesting observations resulting from these parameters on the shear stimulation in a natural fracture system. Three types of fracturing networks were observed from the studied simulations, and the results also show that variable injection rate technology is most promising for producing complex fracturing networks. This work strongly links the production technology and geomechanical evaluation. It can aid in the understanding and optimization of hydraulic fracturing simulations in naturally random fractured reservoirs.

关键词： Non-tectonic micro-fracture Hydraulic fracturing Fracturing network Numerical simulation

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Multiple description video coding based on residuum compensation

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Science in China(Series F) 2009年第8期52卷 1439-1445页

作者： ZHAO AnBang YU Yun SUN GuoCang li guanfang HUI JunYing National Laboratory of Underwater Acoustic Technology Harbin Engineering University Harbin 150001 China

As one of the focus areas of robust video coding and transmission, multiple description video coding has attracted comprehensive attention. The low coding efficiency of multiple description video coding is always the major challenge in this field. In order to improve the performance of multiple description video coding, this paper proposes a scheme based on residuum compensation. In this scheme, each original video frame is encoded with a traditional encoder first to get the first description. Then the error residuum of each coded frame is added up to the corresponding original frame and the resulting compensated frame is encoded by another traditional encoder to generate the second description suc- cessively. This work uses JM10.0 of H.264/AVC as video coding codec to conduct the experiments. The experimental results show that the proposed scheme has good coding performance. Compared to state of art traditional single description encoder, the efficiency can be as high as 90%, he. the redundancy is only 10% to 20%.

关键词： multiple description coding successive refinement coding noise streaming transmission

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Relationship between the types of binary alloy phase diagrams of Ⅷ and IB group elements and the Mendeleev numbers

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Rare Metals 2002年第1期21卷 28-35页

作者： HE Chunxiao, li guanfang, LUO Yanbo, and li Yanan Kunming Institute of Precious Metals, Kunming 650221, China

The relationship between the types of binary alloy phase diagramsof VIII and Ib group elements and the Men- deleev numbers wasdiscussed for the first time using the VIII and IB group elements assolvent metals (A) and the other elements as solute metals (B),basesd on their alloy phase diagram types. The Mendeleev numbers ofthe solvent metals and the solute metals were expressed as M_A andM_B, respectively. A two-dimension map of M_A/M_B was drawn. It isindi- cated that there is an oblique line in the map, which dividesthe binary alloy phase diagram types of solvent metals into twosymmetry parts, the phase diagram types of the other elements withsolvent metals located at the above or down of the line respectively,while on the line, △M = 0.

关键词： Mendeleev number Binary alloy phase diagram Phase diagram type preciousmetals

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Research on detection and azimuth estimation for the splash sound of target's water entry based on empirical mode decomposition

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Chinese Journal of Acoustics 2009年第4期28卷 352-361页

作者： li guanfang ZHAO Anbang HUI Junying WANG Yilin College of Underwater Acoustic Engineering Harbin Engineering University Harbin150001

The splash sound of target＇s water entry is an instantaneous signal, consisting of impact component and bubble components. It is difficult to detect and estimate the azimuth of this signal by traditional azimuth estimation methods using a single vector sensor, especially when the SNR is low. Empirical mode decomposition is a nonlinear analysis method that can emphasize signals＇ instantaneous characteristic. In this paper, the pressure and particle velocities are decomposed into different intrinsic mode functions （IMF）, and the MAIA （mode acoustic intensity averager） method can realize the instantaneous signals＇ detection and azimuth estimation. The lake experiment and sea trial results show that this method can decompose water-entry sound and ambient interference into different IMFs, so as to detect the starting time of water-entry sound signal and estimate its azimuth effectively.

关键词： mode IMF EMD Research on detection and azimuth estimation for the splash sound of target’s water entry based on empirical mode decomposition

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Numerical Analysis on the Optimization of Hydraulic Fracture Networks

Numerical Analysis on the Optimization of Hydraulic Fracture...

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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： Zhaobin Zhang Xiao li Weina Yuan Jianming He guanfang li Yusong Wu Institute of Geology and Geophysics Chinese Academy of Sciences School of Geology Engineering and Geomatics Chang'an University

The clear understanding of hydraulic fracture network complexity and the optimization of fracture network configuration are important to the hydraulic fracturing treatment of shale gas *** the prediction of hydraulic fracture network configuration,one of the problems is the accurate representation of natural *** this work,a real natural fracture network is reconstructed from shale ***,a virtual fracture system is proposed to simulate the large number of small fractures that are difficult to identify.A numerical model based on the displacement discontinuity method is developed to simulate the fluid-rock coupling system.A dimensionless stress difference that is normalized by rock strength is proposed to quantify the anisotropy of crustal *** hydraulic fracturing processes under different stress conditions are *** most complex fracture configurations are obtained when the maximum principle stress direction is perpendicular to the principle natural fracture *** contrast,the worst results are obtained when these two directions are parallel to each ***,the side effects of the unfavorable geological conditions caused by crustal stress anisotropy can be partly suppressed by increasing the viscous effect of the fluid.

关键词： complex fracture network displacement discontinuity method hydraulic fracturing shale gas stress anisotropy

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基于经验模态分解的物体入水声检测及测向研究

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声学学报 2008年第6期33卷 548-554页

作者：李关防赵安邦惠俊英王逸林哈尔滨工程大学水声工程学院黑龙江哈尔滨150001

物体入水声是一种瞬态信号,其波形由击水声和若干气泡脉动组成。传统的矢量信号处理方法对此类瞬态信号的检测和测向会出现困难,尤其是在信噪比较低时检测不到入水声信号。经验模态分解是一种突出信号局部瞬态特性的非线性分析方法,将... 详细信息

物体入水声是一种瞬态信号,其波形由击水声和若干气泡脉动组成。传统的矢量信号处理方法对此类瞬态信号的检测和测向会出现困难,尤其是在信噪比较低时检测不到入水声信号。经验模态分解是一种突出信号局部瞬态特性的非线性分析方法,将矢量传感器接收的声压、振速信息分解为不同的固有模态函数,利用文中提出的模态声强器的方位估计算法,可以实现瞬态信号的检测和测向。湖试和海试结果表明该方法能把本地干扰和入水声分解到不同的模态函数中,利用模态声强器可以在本地强干扰下有效检测到入水声信号出现的时间,并可以实现测向。

关键词：经验模态分解声检测测向物体固有模态函数非线性分析方法水声信号矢量传感器

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我国贵金属二次资源回收技术现状

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稀有金属 1998年第1期22卷 63-66页

作者：周一康李关芳昆明贵金属研究所

阐明了我国贵金属二次资源回收的意义。详细叙述了我国近２０年来从废电子电器材料、废感光材料、失效催化网、催化剂、合金废料、炉灰、粉尘等贵金属二次资源中回收金、银、铂族金属的新技术及应用情况。

关键词：贵金属二次资源资源回收金属回收

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产科优质护理服务体会

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中国医药科学 2013年第6期3卷 124-125页

作者：李冠芳广东省云浮市妇幼保健院广东云浮527300

目的观察产科优质护理的服务效果。方法对2012年7月～2013年1月于本院产科生产的108例产妇开展优质护理服务。结果调查结果显示,随着本院产科优质护理服务工作的不断完善和服务水平的不断提高,产妇及其家属的满意度高达97.2%。结论通过... 详细信息

目的观察产科优质护理的服务效果。方法对2012年7月～2013年1月于本院产科生产的108例产妇开展优质护理服务。结果调查结果显示,随着本院产科优质护理服务工作的不断完善和服务水平的不断提高,产妇及其家属的满意度高达97.2%。结论通过在产科实施优质护理,护理人员转变了服务理念,促进护患关系的和谐,为产妇及新生儿提供高质量护理服务,提高了信任度和满意度,值得推广运用。

关键词：产科优质护理服务

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页岩结构面特征及其对水力压裂的控制作用

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石油与天然气地质 2019年第3期40卷 653-660页

作者：李晓赫建明尹超黄北秀李关访张召彬李丽慧中国科学院地质与地球物理研究所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 中国科学院大学地球与行星科学学院北京100049

页岩是沉积岩中的一种,具有十分明显的层理构造。探究页岩层理结构面对其水力压裂行为的影响,对页岩气的开采具有重要意义。通过对鄂尔多斯盆地南部延长组页岩不同尺度下(米级到十微米级)沉积结构特点的分析,结合不同层理倾角条件下的... 详细信息

页岩是沉积岩中的一种,具有十分明显的层理构造。探究页岩层理结构面对其水力压裂行为的影响,对页岩气的开采具有重要意义。通过对鄂尔多斯盆地南部延长组页岩不同尺度下(米级到十微米级)沉积结构特点的分析,结合不同层理倾角条件下的大尺寸页岩试样水力压裂试验,研究了页岩结构面(层理面)的特征及其对水力压裂过程和结果的控制作用。结果表明,米级、分米级、厘米级、毫米级和10微米级等不同研究尺度下的纹层平均厚度分别为2. 26 m,2. 09 dm,1. 70 cm,1. 48 mm和11. 7μm,呈现出分形特征,且分形维数为1. 06。页岩水力压裂行为受层理结构面影响显著,主要体现在压裂前后裂缝形态对比与破裂压力两个方面。层理倾角小于30°时,页岩试样压裂前后裂缝形态对比明显,新生裂缝较多,破裂压力较大,且随着层理倾角的增大急剧减小;大于45°时,压裂前后试样的裂缝形态几乎没有改变,破裂压力较小,且随着层理倾角的增大呈现小幅度的波动;整体上不同层理面角度下页岩的破裂压力呈斜"S"型变化。试验中的裂缝扩展,水压曲线以及破裂压力随层理倾角的不同均发生变化。

关键词：破裂压力裂缝结构面纹层页岩水力压裂延长组鄂尔多斯盆地

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