太原市供水风险和外区调水水价预测

提出了太原市2000～2030年期间高、中、低三种需水量预测方案,进行了未来规划期降水、径流和地下水资源的人工系列生成并定量分析了上述规划期内的供水风险及其变化过程。对引黄济并工程,计算了不同调水量的使用概率,结合工程水价的经济分析,对规划期内外调水的期望水价进行了定量评价。     

单管高压旋喷桩加固软土地基的应用

介绍了单管高压旋喷桩加固软土地基的应用 ,主要叙述单管高压旋喷技术的施工工艺、技术参数、检测结果及注浆机理分析等。     

Ionospheric quiet-day currents and their effects on the interpretation of upper mantle conductivity – A review

A review of ionospheric currents,the external part of geomagnetic solar quiet (Sq)variation and the internal part of the induced currentwithin the Earth, has been carried out.The theoretical background has been reviewed,and the method of analysis, specificallythe spherical harmonic analysis (SHA),is presented. Various works are reviewed andfully discussed. It has been noted that anew model of the Sq current system could beused to obtain a mantle electrical conductivityprofile for hemispheres. It is suggested thatfurther research work be carriedout in other hemispheres using similarmodels for more robust interpretations.     

圆钢管混凝土构件弯矩-曲率滞回特性研究

首先确定了往复应力作用下组成圆钢管混凝土的钢材和核心混凝土的应力－应变关系模型、在此基础上,利用数值计算方法,对圆钢管混凝土构件弯矩－曲率滞回关系曲线进行了理论分析,其结果和试验结果吻合良好。最后,提出圆钢管混凝土构件弯矩－风率恢复力模型,给出模型中有关参数的计算公式,可为圆钢管混凝土体系弹塑性分析提供参考。     

适用于岩石力学细观实验研究的加载仪

根据岩石工程力学性质研究的需要, 研制了岩石细观力学加载仪( YXJY-5T)。 该仪器设备配装在光学体视显微镜下 , 可以观察岩样在加载过程中, 四个平面( 岩石试样为长方形柱体)变形破坏的全过程, 并获得岩样的应力-应变曲线和相对应的细观结构变化的图像。     

深海垂直吊放缆索系统固有频率和母船临界运动幅值快速计算方法

探索一种可描述缆索系统垂向吊放动力学行为的解析模型.给出它的自封闭方程、固有频率和简谐运动表达式,确定了母船和中际站之间的运动和张力传递函数,模拟结果能很好地符合实验估计值.导出沿着缆索的张力表达式,可用来预测缆索松驰和突变载荷的发生.     

高浓度硅藻对桡足类繁殖的影响

近年来,许多现场和实验室研究表明:一直被看作是桡足类主要食物来源的硅藻对桡足类繁殖、生长和发育具有抑制作用.本文通过桡足类体内因素和体外因素两方面介绍了高浓度硅藻对桡足类种群动态的影响.体内因素主要体现在硅藻的营养缺陷和次级代谢物毒性伤害上,体外因素主要为硅藻胞外分泌物、环境因素以及实验方法不同等.文章在介绍其研究现状的基础上,对今后的工作加以展望.     

Study on Failure Mechanism and Bearing Capacity of Three-Dimensional Rectangular Footing Subjected to Combined Loading

This paper presents two kinematic failure mechanisms of threc-dimensional rectangular footing resting on homogeneous undrained clay foundation under uniaxial vertical loading and uniaxial moment loading. The failure mechanism under vertical loading comprises a plane strain Prandti-type mechanism over the central part of the longer side, and the size of the mechanism gradually reduces at the ends of the longer side and over the shorter side as the corner of rectangular footing is being approached where the direction of soil motion remains normal to each corresponding side respectively. The failure mechanism under moment loading comprises a plane strain scoop sliding mechanism over the central part of the longer side, and the radius of scoop sliding mechanism increases linearly at the ends of the longer side. On the basis of the kinematic failure mechanisms mentioned above, the vertical ultimate bearing capacity and the ultimate bearing capacity against moment or moment ultimate bearing capacity are obtained by use of upper bound limit analysis theory. At the same time, numerical analysis results, Skempton＇ s results and Salgado et al. ＇s results are compared with this upper bound solution. It shows that the presented failure mechanisms and plastic limit analysis predictions are validated. In order to investigate the behaviors of undrained clay foundation beneath the rectangular footing subjected to the combined loadings, numerical analysis is adopted by virtue of the general-purpose FEM software ABAQUS, where the clay is assumed to obey the Mohr-Coulomb yielding criterion. The failure envelope and the ultimate bearing capacity are achieved by the numerical analysis results with the varying aspect ratios from length L to breadth B of the rectangular footing. The failure mechanisms of rectangular footing which are subjected to the combined vertical loading V and horizontal loading H （Vertical loading V and moment loading M, and horizontal loading H and moment loading M respectively are observed in the finite e     

Study on Collision Characters for SPAR Platform

This paper presents the research on the external mechanism of collision characters for a SPAR platform. The collision characters of SPAR platform have not attracted so much attention as that of ships in the past, because short of this kind of collision accidents reported. But with the increasing number of SPAR platforms in the world, the possibility of such kind of accident also increases. Therefore, it is necessary to master the character of SPAR collision. Model test technique is employed to study the external mechanism. The collision scenario is a ship colliding with a SPAR platform moored in the site with 1500 meters water depth. The striking ship hits the SPAR platform on the hard tank near water surface in its longitudinal direction. The specifics of the SPAR＇s motions and the tension forces of the mooring lines are collected to summarize the hydrodynamic characters in the collision scenario. It is found that the maximal displacements and the maximal pitch angles of the SPAR platform, and the maximal tension forces of mooring lines are all linearly proportional to the initial velocity of the striking ship basically. Mooring lines play elastic roles in the collision course.     

海底管线地震应力影响分析

基于Biot动力固结理论建立海床-管线相互作用的计算模型。利用粘弹性人工边界,以大型有限元软件ADINA为平台对El Centro地震波作用下的海底管线的动力响应进行分析,重点讨论管线覆盖层几何形状以及海床土各向异性对海床土体的孔隙水压力和管线内应力的影响,更为实际地反映了海底管线的地震应力作用。