Numerical analysis of grouting radius and grout quantity in fractured rock mass

为预测浆液在裂隙中的扩散范围,建立二维正交裂隙网络宾汉浆液渗流模型,采用中心型有限体积法进行数值模拟。分别研究不同参数下,浆液在裂隙中的扩散范围,给出多因素影响下的注浆扩散半径公式和注浆量公式。研究表明,注浆压力、浆液黏度、浆液剪切强度、裂隙开度和裂隙粗糙度对浆液扩散半径起到主导作用; 注浆压力、钻孔长度和裂隙开度对注浆量起到主导作用。通过该公式可定量预测任意参量下浆液扩散范围和注浆量

调动学生学习兴趣提高解剖学教学效果

学习兴趣是指一个人对学习的一种积极的认识倾向与情绪状态,是一种带有趋向性的心理特征[1]。在教学实践中经常可以发现,尽管师资水平、教学方法、设备条件、学生的文化程度诸多因素基本

Interactions of Penny-Shaped Cracks in Three-Dimensional Solids

The interaction of arbitrarily distributed penny-shaped cracks in three-dimensional solids is analyzed in this paper. Using oblate spheroidal coordinates and displacement functions, an analytic method is developed in which the opening and the sliding displacements on each crack surface are taken as the basic unknown functions. The basic unknown functions can be expanded in series of Legendre polynomials with unknown coefficients. Based on superposition technique, a set of governing equations for the unknown coefficients are formulated from the traction free conditions on each crack surface. The boundary collocation procedure and the average method for crack-surface tractions are used for solving the governing equations. The solution can be obtained for quite closely located cracks. Numerical examples are given for several crack problems. By comparing the present results with other existing results, one can conclude that the present method provides a direct and efficient approach to deal with three-dimensional solids containing multiple cracks

Effective elastic moduli of inhomogeneous solids by embedded cell model

An embedded cell model is presented to obtain the effective elastic moduli for three-dimensional two-phase composites which is an exact analytic formula without any simplified approximation and can be expressed in an explicit form. For the different cells such as spherical inclusions and cracks surrounded by sphere and oblate ellipsoidal matrix, the effective elastic moduli are evaluated and the results are compared with those from various micromechanics models. These results show that the present model is direct, simple and efficient to deal with three-dimensional tyro-phase composites

南海中深层动力格局与演变机制研究进展

南海是连接印度洋-太平洋的最大边缘海,在季风、海峡水交换以及复杂地形影响下,南海环流呈现出独特的三层结构以及远强于大洋的混合特征.理论与观测表明,南海内潮、内孤立波以及强风等过程是强混合的动力来源.在南海强混合作用下,南海发育了活跃的中深层动力系统,一方面促进了南海与大洋之间的水体交换,另一方面调控上层风生环流,使得南海环流显著区别于其他热带与副热带海盆.南海活跃的中深层环流所具有的物质搬运能力又显著影响着南海的地质沉积、生物地球化学循环等过程.中国对深海研究持续投入,在南海中深层环流动力学研究方面取得了显著的成果,文章就该方面进行总结,并对南海深海环流未来研究设想进行初步探讨

Effect of relieving fever and reducing plasmas glucose of 3 kinds of Digupi on albino rats

作者简介: 黄小红(1966- ) , 女, 讲师, 硕士. 研究方向: 动物生物化学.用 3种地骨皮 (枸杞根皮、宁夏枸杞根皮、北方枸杞根皮 )原生药总提取物灌喂大、小白鼠 ,测定它们对白鼠的解热和降血糖作用 .结果表明 :枸杞根皮和宁夏枸杞根皮对角叉菜胶致热的大白鼠有明显的解热作用 ;北方枸杞虽也有明显解热作用 ,但其作用强度弱于枸杞和宁夏枸杞 .3种枸杞根皮中仅枸杞根皮对四氧嘧啶小白鼠有明显降血糖作用 ,其余 2种地骨皮降血糖作用不甚明显

Controllable Syntheses and Magneto-chiral Properties of Chiral Metal Clusters Ln5Ni6

磁性和手性一直是物理、化学以及材料科学等众多领域的研究热点。这是因为它们不仅在理解宏观量子隧穿效应、生命的起源等理论方面具有重要意义，而且在磁制冷材料、信息存储、不对称催化、手性拆分等领域也具有重要的实用价值。将磁性和手性相结合，可为多功能材料的开发提供一种途径。这种多功能材料不仅同时具有磁性和手性，更重要的是它可能表现出磁性和手性的交叉效应，即磁手征二色性。这种效应不仅为生命的起源提供了一种合理的解释，也为更高级的信息存储方式提供了研究思路。虽然磁手征效应已经在稀土配合物、过渡金属配合物、有机化合物以及手性纳米磁体等体系中发现，但每个体系的报道均屈指可数。因此，合成具有磁手征二色性的多功能材...Magnetism and chirality are permanent research hotspots in various fields such as physics, chemistry and materials science. This happens because they have great significance not only in theoretical aspects of macroscopic quantum tunneling effect and the origin of life, but also in practical fields such as magnetic refrigeration materials, information storage, asymmetry catalysis and chiral resolut...学位：理学硕士院系专业：化学化工学院_无机化学学号：2052013115153