物质点法MPM(Material Point Method)是无网格方法之一。它是在质点网格法(PIC)基础上发展而来的一种新数值方法,它利用了欧拉法和拉格朗日法两者的优点,计算物质点在冲击载荷下的应力和应变;通过物质点来跟踪材料体的变形和破损,而在...物质点法MPM(Material Point Method)是无网格方法之一。它是在质点网格法(PIC)基础上发展而来的一种新数值方法,它利用了欧拉法和拉格朗日法两者的优点,计算物质点在冲击载荷下的应力和应变;通过物质点来跟踪材料体的变形和破损,而在整个计算过程中背景网格始终固定不变,避免了重新划分网格。本文应用MPM法计算三维爆炸焊接问题,在爆轰载荷作用下的飞板和基板的金属动态变形过程进行了三维数值模拟,并且对飞板的碰撞点速度和爆轰压力变化进行了计算分析。展开更多
针对准噶尔盆地大有3井区井井子沟组储层非均质强、具有潜在水敏性及压裂开发整体产油效果不佳的问题,弄清该区块储层水敏作用机理为选择合适工作液提供指导显得尤为重要。本文开展水岩作用实验、岩石力学特性分析,根据水岩作用垮塌程...针对准噶尔盆地大有3井区井井子沟组储层非均质强、具有潜在水敏性及压裂开发整体产油效果不佳的问题,弄清该区块储层水敏作用机理为选择合适工作液提供指导显得尤为重要。本文开展水岩作用实验、岩石力学特性分析,根据水岩作用垮塌程度将岩样分为三类:不垮塌(I类)、缓速垮塌(II类)和快速垮塌(III类),II类和III类岩样均属于软岩范畴。针对三类典型岩样开展了岩样矿物组成及含量分析、岩样微观结构分析及可溶盐分析等,实验结果表明:(1) 黏土矿物总含量高(伊蒙混层含量高,且蒙脱石占比高)是引起水敏的根本;(2) 胶结疏松、以粒间溶孔为主或构造缝发育、填隙物中(铁)泥质含量高且可溶盐含量高等与岩样垮塌程度呈正相关,对于III类岩样快速崩解分析认为是多重因素耦合作用造成。For the problems of strong heterogeneity, potential water sensitivity and poor overall oil production effect of fracturing development in the formation in Dayou-3 well block of Junggar basin, it is particularly important to clarify the reservoir water sensitivity mechanism in this block to provide guidance for selecting appropriate working fluid. In this paper, laboratory experiment of water-rock interaction and analysis of rock mechanical property were carried out. According to the collapse degree of water rock interaction, the rock samples are divided into three categories: not collapsed (Class I), slowly collapsed (Class II) and rapidly collapsed (Class III). Both Class II and Class III rock samples belong to the category of soft rock. Through the analysis of mineral composition and content, microstructure and soluble salt of rock samples for three types of typical rock samples, the experimental results show that (1) The high total content of clay minerals (high content of montmorillonite mixed layer and high proportion of montmorillonite) is the fundamental cause of water sensitivity;(2) The degree of rock collapse is positively correlated with loose cementation, mainly intergranular dissolved pores or developed structural fractures, high content of (iron) mud and soluble salts in the filling material. For the rapid disintegration analysis of Class III rock samples, it is believed to be caused by the coupling effect of multiple factors.展开更多
为了解决当炸弹在近场爆炸时爆轰波驱动破碎的弹片共同作用于混凝土墙壁的过程中所涉及的多物理场计算和多相介质耦合分析等问题,利用物质点法(material point method,MPM)不需要考虑物质间的分界面、耦合条件自动满足等特点,应用无网格...为了解决当炸弹在近场爆炸时爆轰波驱动破碎的弹片共同作用于混凝土墙壁的过程中所涉及的多物理场计算和多相介质耦合分析等问题,利用物质点法(material point method,MPM)不需要考虑物质间的分界面、耦合条件自动满足等特点,应用无网格MPM法对两种类型的炸弹(带金属外壳和不带金属壳)产生的爆炸场、弹片破碎和混凝土墙壁的破坏进行数值模拟。数值结果表明,无网格MPM法是计算多相介质爆炸效应的一种有效的算法。展开更多
利用MPM(material point method)计算方法,以爆炸焊接作为实例,对炸药滑移爆轰过程和金属飞板与基板之间的碰撞变形进行了数值模拟．并将无网格MPM法的数值计算结果与近似解析公式的计算结果进行了比较,二者基本吻合,有力地证明了无网格...利用MPM(material point method)计算方法,以爆炸焊接作为实例,对炸药滑移爆轰过程和金属飞板与基板之间的碰撞变形进行了数值模拟．并将无网格MPM法的数值计算结果与近似解析公式的计算结果进行了比较,二者基本吻合,有力地证明了无网格MPM法在求解爆炸冲击问题中的有效性和健壮性．展开更多
文摘物质点法MPM(Material Point Method)是无网格方法之一。它是在质点网格法(PIC)基础上发展而来的一种新数值方法,它利用了欧拉法和拉格朗日法两者的优点,计算物质点在冲击载荷下的应力和应变;通过物质点来跟踪材料体的变形和破损,而在整个计算过程中背景网格始终固定不变,避免了重新划分网格。本文应用MPM法计算三维爆炸焊接问题,在爆轰载荷作用下的飞板和基板的金属动态变形过程进行了三维数值模拟,并且对飞板的碰撞点速度和爆轰压力变化进行了计算分析。
文摘针对准噶尔盆地大有3井区井井子沟组储层非均质强、具有潜在水敏性及压裂开发整体产油效果不佳的问题,弄清该区块储层水敏作用机理为选择合适工作液提供指导显得尤为重要。本文开展水岩作用实验、岩石力学特性分析,根据水岩作用垮塌程度将岩样分为三类:不垮塌(I类)、缓速垮塌(II类)和快速垮塌(III类),II类和III类岩样均属于软岩范畴。针对三类典型岩样开展了岩样矿物组成及含量分析、岩样微观结构分析及可溶盐分析等,实验结果表明:(1) 黏土矿物总含量高(伊蒙混层含量高,且蒙脱石占比高)是引起水敏的根本;(2) 胶结疏松、以粒间溶孔为主或构造缝发育、填隙物中(铁)泥质含量高且可溶盐含量高等与岩样垮塌程度呈正相关,对于III类岩样快速崩解分析认为是多重因素耦合作用造成。For the problems of strong heterogeneity, potential water sensitivity and poor overall oil production effect of fracturing development in the formation in Dayou-3 well block of Junggar basin, it is particularly important to clarify the reservoir water sensitivity mechanism in this block to provide guidance for selecting appropriate working fluid. In this paper, laboratory experiment of water-rock interaction and analysis of rock mechanical property were carried out. According to the collapse degree of water rock interaction, the rock samples are divided into three categories: not collapsed (Class I), slowly collapsed (Class II) and rapidly collapsed (Class III). Both Class II and Class III rock samples belong to the category of soft rock. Through the analysis of mineral composition and content, microstructure and soluble salt of rock samples for three types of typical rock samples, the experimental results show that (1) The high total content of clay minerals (high content of montmorillonite mixed layer and high proportion of montmorillonite) is the fundamental cause of water sensitivity;(2) The degree of rock collapse is positively correlated with loose cementation, mainly intergranular dissolved pores or developed structural fractures, high content of (iron) mud and soluble salts in the filling material. For the rapid disintegration analysis of Class III rock samples, it is believed to be caused by the coupling effect of multiple factors.
文摘为了解决当炸弹在近场爆炸时爆轰波驱动破碎的弹片共同作用于混凝土墙壁的过程中所涉及的多物理场计算和多相介质耦合分析等问题,利用物质点法(material point method,MPM)不需要考虑物质间的分界面、耦合条件自动满足等特点,应用无网格MPM法对两种类型的炸弹(带金属外壳和不带金属壳)产生的爆炸场、弹片破碎和混凝土墙壁的破坏进行数值模拟。数值结果表明,无网格MPM法是计算多相介质爆炸效应的一种有效的算法。
