系泊时船间作用力计算模型的浅水修正

系泊船受驶过船影响,船间作用力通用计算模型在浅水中存在着较大误差,针对这种情况搜集了一些船模试验数据,对通用计算模型在浅水中的应用提出了修正方案.从修正后的结果看,修正后的通用计算模型有更高的精度,更加适合用于模拟器中船舶运动的仿真.另外,给出了系泊船受到的船间作用力峰值回归公式,研究了船间作用力在不同水深及初始横距下的变化规律.     

浅析东濮凹陷浅层砂岩储层的成岩特征

浅层油气藏具有低勘探成本投入、高开发收益回报优势,东濮浅层探明石油地质储量仅为3.9%,具有较大的勘探潜力。应用扫描电镜和铸体薄片技术,对东濮凹陷浅层储层进行了研究。首先通过对原始资料的综合整理分析,确定出本区的成岩演化阶段;然后通过具体观察成岩现象,总结出本区主要的成岩作用类型;在此基础上,阐述了研究区砂岩各阶段的成岩特点,探讨了成岩作用对砂岩储层孔隙结构的影响。     

Kumkol-North油田主力油层三角洲前缘砂体内部结构解剖

Kumkol-north油田上侏罗统库姆科尔组主力小层三角洲前缘砂体中,未水淹和弱水淹层厚度所占比重较大,水驱动用程度小于45%。前人研究认为三角洲前缘砂体内复杂的建筑结构导致了这种现象。研究发现该地区属于典型的浅水三角洲砂体,沉积构造背景稳定,发育了一套与传统深水型三角洲特征差异明显的浅水型三角洲沉积储层。用"垂向分层、平面分带"的传统解剖思路,难于合理解释生产中。以Kumkol-north油田J22小层为研究对象,在充分认识砂体沉积特点的基础上,结合针对浅水三角洲砂体内部结构进行的沉积模拟实验提出的新的叠覆式浅水三角洲沉积模式,以及新的储层内部结构分析方法,对Kumkol-north油田主力小层做了精细的内部结构解剖。重建了以朵体为基本沉积单元的三角洲内部储层结构格架,为进一步提高Kumkol-north油田主力油层的勘探开发奠定了基础。     

浅表层及粗晶材料缺陷超声诊断方法

针对浅表层及粗晶材料,提出一种用小波变换与广义相关倒频谱分析相结合的缺陷诊断方法.该方法利用小波多分辨特性去除白噪声,利用广义相关倒频谱剔除始脉冲及材料散射噪声.实验结果表明:该方法提高了对浅表层及低信噪比缺陷的分辨力,缺陷诊断结果与实际结果相吻合,可用于浅表层及粗晶材料缺陷的诊断.     

近浅埋煤层大采高综采面矿压规律研究

霍洛湾煤矿所采煤层为近浅埋煤层,其22110工作面为一盘区第四个综采面,同时也是末采面,工作面赋存条件与接替的二盘区工作面条件及其相似,具体表现在煤层厚度、顶底板岩性、倾角、埋藏深度等。经对其进行矿压观测研究及支架适应性,得到工作面来压步距、过谷沟地形的矿压规律及支架工作阻力与动载系数,研究结论对二盘区安全高效开采具有现实指导意义,对可能存在的问题得以提前判知与解决。     

浅海环境中水下物体声目标强度的物理意义

根据简正波理论,推导了基于平均测量法的浅海环境中水下物体声目标强度TS（Target Strength）的解析表达式,深入分析了TS的物理意义.分析表明,在确定的方位角上,TS与分布在一定范围内的垂直入射角i和散射角s所对应的目标散射函数值有关,i和i是离散的,其取值取决于简正波阶数;同时,TS还跟海洋环境和测试距离有关,当测试距离非常大时,约等于自由场声目标强度TSfree.     

Analysis of mechanical behaviors of big pipe roof for shallow buried large-span tunnel

A series of researches on mechanical behaviors of big pipe roof for shallow large-span loess tunnel were carried out based on the Wenxiang tunnel in Zhengzhou -Xi＇ an Special Passenger Railway. The longitudinal de- formations of the pipe roofs were monitored and the mechanical behaviors of the pipe roofs were analyzed at the test section. A new double-parameter elastic foundation beam model for pipe roof in shallow tunnels was put for- ward in Wenxiang tunnel. The measured values and the calculation results agreed well with each other, revealing the force-deformation law of big pipe roof in loess tunnel： At about 15 m in front of the excavating face, the pipe roof starts to bear the load; at about 15 m behind the excavating face, the force of the pipe roof tends to be stabi- lized; the longitudinal deformation of the whole pipe roofs is groove-shaped distribution, and the largest force of pipe roofs is at the excavating face. Simultaneously, the results also indicate that mechanical behaviors of pipe roof closely relate to the location of the excavation face, the footage of the tunnelling cycle and the mechanics pa- rameters of pipe roof and rock. The conclusions can be reference for the design parameter optimization and the con- struction scheme selection of pipe roofs, and have been verified by the result of numerical analysis software FLAC3D and deformation monitoring.     

环形浅液池内双组分溶液耦合热溶质毛细对流渐近解

采用匹配渐近展开法求解环形浅液池内热溶质耦合毛细对流中心区域渐近解,分析Soret效应和浮力对流动的影响。结果表明,当不考虑溶质毛细力和浓度的不均匀引起的浮力作用时,该解与环形浅液池内纯工质热毛细浮力对流或热毛细对流的渐近解完全一致;在浅液池内,浮力的影响较小,耦合的热溶质毛细力对流动过程起主导作用;当各种耦合的驱动力作用方向相同时,流动加强,相反,一旦存在反向的情况,则流动必然相互削弱。     

考虑断层影响的煤层开采沉陷三维有限元模拟

为了解决山东某煤矿的煤层开采对周边俱乐部沉降的影响问题,采用有限元分析的方法并建立不同开采方案的三维地质模型,同时考虑断层的影响,计算出煤层开采后俱乐部四角的地表下沉状况。研究结果表明:回采3101工作面时俱乐部地表下沉最大值达到382 mm,因此建议对俱乐部进行加固保护处理。该成果为研究最佳开采方案及周边俱乐部的保护提供重要依据,同时为浅埋煤层以及类似条件下中小矿山合理、安全、经济的开发提供了重要的参考依据。     

The design of Three Gorges Hydropower Station

Using physical model and numerical simulation techniques,some technical problems were studied systematically,including layout of power station,measures of sediment and floating debris discharging,types of intake,embedded types of spiral case,layout of underground powerhouse tunnel group and block reinforcement.It was optimal in technique and economy with the arrangement of powerhouse at the dam-toe of both banks +underground powerhouse in the right bank,as well as the intake with a single and small orifice.The sediment and debris problems could be solved with disperse sediment ejection and floating debris discharging holes.With the adoption of techniques for spiral cases such as heat and pressure preservation,cushion layer and combined embedding,the stable operation of generating units can be guaranteed.The arrangement of tailrace tunnel with sloping ceiling was better than that of tailrace surge tank.The technical requirements related to the embedding type of spiral case were proposed.The reinforcement of huge unfavorable blocks was discussed and the new idea for block reinforcement using anti-sliding piles and normal compressive stress of structural plane was put forward.