简介:Webuiltathree-dimensionalmodeltosimulatethedisturbanceofthestressfieldnearthereversefaultinZhaziao,LeyiTownshipowingtohydraulicfracturing.Theporepressure,andshearandnormalstressesduringfracturingareanalyzedindetail.Inputrockmechanicsparametersaretakenfromlaboratorytestdataofshalesamplesfromthestudyarea.Thesimulationresultssuggestthatafter16hoursoffluidinjection,thepore-pressurevariationcanactivatethereversefault,i.e.,weobservereverseslip,andtheshearstressanddisplacementonthefaultplaneincreasewithtime.Thebiggeststress–strainchangeoccursafteronehouroffluidinjectionandtheyieldpointappearsabout0.5hafterinjection.Toobservethestressevolutionineachsection,thenormaldisplacementontheboundaryisconstrainedandthefaultplaneissetasnonpermeable.Thus,theslidingislimitedandthesheardisplacementisonlyinthescaleofmillimeters,andthecalculatedmagnitudeoftheinducedearthquakesisbetweenMw-3.5andMw-0.2.Thesimulationresultssuggestthatfluidwaterinjectionresultsininhomogeneousfracturing.Themainrupturedareasarearoundtheinjectionpositions,whereastheextentofrupturingandcracksinotherareasarerelativelysmall.Nevertheless,nonnegligiblefaultactivationisrecorded.Sensitivityanalysisofthekeyparameterssuggeststhattheporepressureismostsensitivetothemaximumunbalancedforceandtheinternalfrictionanglestronglyaffectsthefaultslip.Finally,thecomparisonbetweentheeffectivenormalstressandthemaximumandminimumprincipalstressesonthefaultplaneexplainsthefaultinstability,i.e.,theMohrcirclemovestowardstheleftwithdecreasingradiusreducesandintersectsthecriticalslipenvelope,andcausesthefaulttoslip.
简介:非洲S盆地是西非Iullemmeden盆地东南边缘的一部分,现有地质资料认为s盆地是一个向西南倾斜的单斜盆地、为初步查明该盆地的地质构造格架为评价盆地的含油气潜力提供依据,在s盆地展开了1:5万重磁调查。本文依据盆地的实测重力数据及已有地质资料,进行了数据处理与解释推断,在研究盆地不同深度空间的重力异常时发现,s盆地具有上下两层断裂系统:下层为一套控制盆地形成与发育的近南北向的基底断裂系统,是西非裂谷系一系列近南北向的地堑式盆地的组成部分;上层为一套有北东向与北西向断裂共同组成的盖层断裂系统(部分运动强烈的切入基底),这套断裂决定了盆地的最终形态并控制着油气流的运移通道和储存空间。
简介:摘要 文章试图探讨心理卫生与康复医学领域的方法与理论引入康复景观,将情绪干预性设计与景观环境配套相结合的方法进行实践。 本文以若干具有情绪干预功效代表性的典型景观场景图片作为实验工具,选择年龄、工种层次不同的受测者,结合交互设计理论进行问卷调查,对缓解抑郁情绪、悲伤情绪和焦虑情绪地景观有效措施作出总结,并选取场地进行设计实践探索,形成对于情绪具有康愈干预性的场景化景观设计方案。