• 期刊名称:岩土工程物理与数值模拟
  • 出版周期:季刊
  • 外文:Physical and Numerical Simulation of Geotechnical Engineering
  • ISSN:1838-3254
  • 出版单位:St. Plum –blossom Press (Australia )
  • 出版地:澳大利亚•墨尔本

浏览次数 9265次

上一期岩土第二十三期 / 刊出日期:2016-07-21下一期
目录
  • Application of Spectral Decomposition Technique in

    YANG Yingjun, LV Youliang, WANG Chengyi

    Spectral decomposition technique, Notches-in-thin-bed, Carbonatite, Dual porosity, Reservoir
    235PDF摘要

    Spectral Decomposition Technique is a processing and interpreting method in frequency domain. Its main theory is based on thin-layer tuning theory. It obtains great success in the study of thin layer in sedimentary rock. In the basis of the analysis for the basic principles of the technology, in connection with the special natureof the carbonate reservoir, this paper expands the analysis and application of spectral decomposition technology, introduces the prediction researches in carbonate reservoir with detailed examples, and demonstrates the notable results of the spectral decomposition technology in the prediction of void and cavernous reservoirs.

  • Production Forecast of SAGD Considering Steam Loss

    JI Youjun, CHENG Linsong , LIU Dong

    Steam Assisted Gravity Drainage, Horizontal well, Production forecast, Steam chamber, Thermal recovery
    253PDF摘要

    Steam Assisted Gravity Drainage (short for SAGD, raised by Butler) is a successful thermal recovery method for extra heavy oil reservoir. Many scholars have finished many researches on its productivity prediction, all of these work were based on the hypothesis that the distribution of steam along the injector is uniform and hence the height of the steam chamber is constant which is not reasonable. On the basis of Butler’s oblique pane drainage theory and production prediction approach of SAGD, and the non-uniform distribution of steam in its horizontal steam chamber is taken into account, this paper will present a new SAGD production forecast model for horizontal well, which will consider the steam loss along its processing and will be further compared with the result of numerical simulation software that considering the wellbore divergence that to prove its correction. The simulation results indicate the height of the steam chamber along the horizontal wellbore is not constant, which is different from the uniform steam chamber hypothesis and coincident with the reality. The production prediction results of the simulation were compared with the calculation results of the new model, it is concluded that the SAGD forecast result that considering the steam loss along the gas injector is closer to the real situation.

  • Application Study of FLAC in Analysis of Slope Sta

    HAO Fengshan, WANG Lei

    FLAC, Rock slop, High—slop reinforcement, Calculation mode, Stability
    267PDF摘要

    FLAC is a numerical analysis software which applied widely in geotechnical engineering. Theoretical basis and specific calculation steps of FLAC are introduced. The problems like model establishment of FLAC numerical analysis software, numerical calculation, result analysis and so on are discussed combine with a loess landslide in Liaoning province. The paper offered the proposals on the slope control.

  • The Stability Analysis of Cross Roadway Support of

    ZHANG Xiangdong, HUANG Kaiyong, XU Jianlai

    Soft rock, Cross-tunnel, Combined support, MIDAS software
    282PDF摘要

    For further research of effect on coal mine soft rock of cross roadway and structural mechanics behavior of early support by dynamic construction process; the construction of the vertical cross-range of auxiliary-roadway and crossheading of Gaojialiang coal mine in Erdos is studied. The cross-tunnel excavation process is simulated by three-dimensional elastic-plastic finite element MIDAS/GTS software; the impact of crossheading dynamic construction process for the structural mechanics behavior of auxiliary roadway surrounding rock and the initial supporting is analyzed. The excavation of crossheading tunnel leads to the stress release and secondary distribution of the main roadway surrounding rock and the supporting structure; the results showed that crossheading excavation has something to do with stress and displacement of the surrounding rock. Combined with the site monitoring results, it provides a reliable basis for the program optimization and security controls of cross roadway construction.

  • Review of Borehole Stability with Different Influe

    CHEN Xinming, LIU Jianjun

    Borehole stability, Stress, Chemical effects, Mechanical and chemical coupling, Drilling fluid density
    280PDF摘要

    The instability of borehole is a critical problem during drilling for the reason that it is controlled by multiple factors. Abundant researches and achievements about borehole stability have been done by researchers from 1840s when the first article bout borehole stability published to now. Mechanical and chemical factors, affecting the borehole stability, were analyzed in this paper. Then the researches about mechanics-chemical coupling were assumed. Finally, other factors, such as geological factors and drilling technological process, were introduced. Therefore, a more comprehensive understanding of the factors affecting borehole stability can be obtained, which can provide a reference to drilling engineering.

  • Numerical Analysis on Energy-absorption Coupling S

    LV Xiangfeng, PAN Yishan

    Rock burst, Coupling support, Energy absorption, Numerical analysis
    266PDF摘要

    Rock burst which caused great damage to roadway and steel support is a kind of dynamic disaster coming from mining. According to the action principle of energy-absorption coupling support, the model of surrounding rock-energy absorbing material-steel support is established. The impact failure law of coal roadway is calculated. The results indicate that impact load have a great effect on nude alley deformation. Distance closer, roadway displacement is bigger also, the displacement increase at roadway direction by impact load. The laws of stress and deformation in semi-circular arched and circle roadways are simulated by finite element method. The calculated results show that the stress concentration regions similar as “bilateral ears” happened at two top corners of the roadway on the condition of non support. The non-coupling between steel support and surrounding rock in stiffness is the main cause of stress-transfer, and then the steel support is broke down caused by beyond yield strength. The distributions of stress and deformation are tending to uniform when energy-absorption coupling support is taken into roadway. And the stress zones of two roadway walls are expending, also the roadway deformation reduces significantly. The comparison of the calculation results show that energy-absorption coupling support can absorb energy efficiently, increase the reliability of roadway substantially and provide a new method to roadway support.

  • Study on the Simulation of Shear Strength Decrease

    ZHANG Zhenhua , ZHAO Baoping

    Physical model test, Sliding zone, Shear strength parameter, Decrease, Submerge 1 PREFACE
    256PDF摘要

    Reservoir water is the main factor to make shear strength of soil in sliding zone of old landslides on reservoir banks decrease. To simulate the decrease of shear strength of sliding zone when submerged by reservoir water in landslide physical model test, a new method was put forward. The new method is numerical method that used to simulate the changes of plastic zone of sliding zone at different uplifting angles of physical model flume and different decreasing cohesion values of the sliding zone, and then a corresponding relationship between the uplifting angle of the model flume and the decrease of cohesion of the sliding zone of the landslide model is established. The new method was applied to Shiliushubao landslide physical model test, and the test result shows that the new method is effective on the simulation of shear strength decrease of soil in sliding zone of old landslides when submerged by reservoir water in landslide and gives a way by raising uplifting angle of physical model flume in a short time to simulate the shear strength decrease of soil in sliding zone in old landslide when submerged by reservoir water for a long time.

  • Numerical Simulation of Soil Temperature Field Sur

    LIU Jianjun, LIN Lijun, PEI Guihong

    Permafrost region, Underground heat pipe, Soil temperature field, Numerical simulation
    269PDF摘要

    To predict the changes of soil temperature field surrounding the underground pipe at constant temperature in permafrost region is important to the pipes and the ground structures atop. Numerical simulation is an effective method to predict the change of soil temperature field including the influence of heat pipe to surrounding soil temperature field. Fluid mechanics, heat transfer theory and permafrost engineering theory are used to analysis of the problem; the problem is carried out as a transient problem. In this paper, a mathematical model for underground heat pipe-soil temperature field has been established and analyzed by using the simulation software GeoStudio TEMP/W; the variation of the soil temperature field in permafrost region has been simulated with or without insulation layer; and the tendency of the freeze-thaw curves and the temperature range surrounding underground heat pipe without insulation layer in operation has been presented and compared with that of with insulation layer. Some novel laws are obtained as follows: (1) When the heat pipe is in operation, the soil temperature field is gradually changing, and the changing speeds up daily, but it will reach a steady state in some day. (2) If there is insulation layer, changes in temperature range will drop a lot, the movement of the freeze-thaw line will decrease more than 55.59%. The bigger the thickness of insulation layer there is, the smaller the temperature range there is. The results provide a theoretical basis for structure optimization and safe operation of underground pipe, etc.

  • The Numerical Analysis of Deformation Field of Lay

    MA Chao , CHAI Junrui

    Impact load, FLAC3D, Dynamic analysis, Moving load, Fluid-solid coupling, Impact roller
    293PDF摘要

    The key factors for the study of soft subgrade under impact loading are the model of soil constitutive, the model of foundation - water and the impact load. The stress-strain relationship on soil is simulated by Mohr-Coulomb constitutive mode. Considering underground water level, foundation structure space model is established by FLAC3D. When subgrade is impacted by moving impact load based on fluid-solid coupling, the laws of underground water level and settlements are discussed detailedly. The results of the study indicate that the settlement effected on the edge is more than on the middle. The underground water level is rising when the impact load is on the edge, and it is dropped on the middle. It appears negative pressure above underground water level.

  • Experimental Study on Influences of Chemical Solut

    YAO Huayan ZHANG Zhenhua

    Rock mechanics, Triaxial compression test, Mechanical properties, Limestone, Chemical corrosion, Stress-strain curve
    299PDF摘要

    A series of triaxial compression tests on dry and saturated limestone samples (soaked in chemical solutions of Na2SO4 and CaCl2 with 0.1mol/L ionic concentration and varying pH values, and distilled water for 240 days) have been carried out. The corresponding complete stress-strain curves are obtained. The influences of chemical solution on rock mechanical behaviors are studied. Results from these tests indicate that: (1) Dry limestone samples have obvious brittle feature. Even if the confining pressure reaching 20MPa, the sample is still ruptured suddenly. After soaked in chemical solutions for 240 days, the deformation and failure behaviors were changed from brittle to ductile manner. (2) Chemical corrosion is an important reason for the strength deterioration of specimens. With the same soaking time and confining pressure, the strength degradation level of samples depends on ionic components and pH value of chemical solutions. Acidic solutions have the most significant influence on samples’ mechanical properties. The fracture modes of samples could be divided into 7 types, which depend on chemical environments and confining pressures. The study has a good reference to researches of deep rock mechanics and water-rock interaction.

  • Investigations on the Law of AE Energy Accumulatio

    WANG Yougang , LIU Xiangfeng

    Damage evolution, Acoustic Emission (AE), Constitutive equation, Dynamic disaster
    282PDF摘要

    Rocks and other rocklike solid materials have inherent defects in its interior. The defects of rock will be evolved under the outside loading. The evolution process and extent of defects can be depicted by the damage variable. But which physical or geometrical parameter or parameters can be used to define the damage, there has no consistent conclusion in home and aboard. Moreover, limited by the method of experimental measure, it is difficult to obtain the parameters to depict the damage variable directly. In order to obtain the evolution law of the interior defects in the solid material, the non-conduct geophysical prospecting measure as Acoustic Emission (AE for short) will be the leading measure to prospect the interior defects and its evolution under outside loading. In the present paper, the AE method was used to obtain the AE parameters during the uniaxial compression process of coal and rock. Thuswise, uniaxial compression and AE tests on coal and mudstone were conducted, and the curves among the AE energy accumulation, stress and strain were obtained after analyzing the results of tests data. Based on the principle of damage mechanics and thermodynamics, the damage evolution of coal and rock was deduced through analyzing the experimental results, the curves of damage and AE accumulation were obtained also. By analyzing and fitting the curves of damage and AE energy accumulation, the relation between the AE energy accumulation and stress-strain was obtained and verified through the experimental data.

  • Further Study on Oblique Axis Parabolic Interpolat

    WU Hehai

    Oblique axis parabola, Smoothing interpolation, Cardan formula, Shengjin formula, Cubic equation
    257PDF摘要

    It is more than 30 years since the publication Oblique Axis Parabolic Interpolation for Curve Smoothing which has received approval and much attention in scientific field. Many scholars have been engaged in application of this interpolation principle sufficiently and in optimizing the process of its computation. They have concentrated themselves on researching the approximated solutions of canonical cubic algebraic equation and the refining methods to replace the original classical Cardan method of solving cubic algebraic equation. Recently, the author has found two simple and efficient mathematical methods for solving the cubic algebraic equation, i.e. the trigonometric solution based on Cardan formula and the excellent Shengjin formula created by a young Chinese mathematician called Fan Shengjin. Both of these methods have been tested with the results of sufficiently accurate solutions. Another result of this research lies in the establishing the algorithm of defining the true azimuthal angle of oblique axis parabola, which had to be solved by probing methods previously.

  • Effects of Distributed Characteristic of Coarse Ag

    YANG Qin 1, YU Haiyang

    Road engineering, Asphalt pavement, High modulus, Mechanical performance, Grade, Aggregate distributing
    274PDF摘要

    In order to quantitatively analyze the effects of distributed characteristic of coarse aggregate on mechanical performance of high modulus asphalt concrete, image analysis technology was used. Results showed that Marshall Stability was markedly changed in coarse aggregate angularity, but the resilience modulus was not obvious changed. Marshall Stability and resilience modulus were increased with PH value increasing, and were decreased with shape coefficient increasing, but the resilience modulus declined slightly when the shape coefficient exceeded a fixed value.

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