中空暗缝RC剪力墙板拟静力试验及数值模拟分析

为明晰中空暗缝RC剪力墙抗剪机理和滞回性能,进行1榀1:3缩尺单层、单跨中空暗缝RC剪力墙板拟静力试验,得到了试件破坏模式、滞回曲线、骨架曲线、刚度退化、强度退化、延性和耗能能力.通过数值模拟分析了混凝土强度、中空暗缝厚度、缝间墙配筋率对剪力墙板水平抗剪承载力的影响.研究结果表明:试件滞回曲线呈捏缩状,耗能能力一般,但...     

1993年7月2—6日皖南赣北致洪暴雨过程分析

用ＴＢＢ资料及物理量诊断分析１９９３年７月２￣６日皖南赣北致洪暴雨成因，揭示一种致洪暴雨常见天气系统的若干结构特点和ＴＢＢ场特征。     

傍河取水辐射井技术应用研究

辐射井是傍河取水的有效开发模式,以富屯溪滩地辐射井傍河取水工程为例进行了试验研究,阐述了辐射井傍河取水的设计方法、涌水量计算、施工技术、试验井水质等。     

SPATIAL AND TEMPORAL DYNAMICS OF SOIL ORGANIC CARBON IN RESERVED DESERTIFICATION AREA —A Case Study in Yulin City, Shaanxi Province, China

Soil organic carbon (SOC) was considered to be a key index in evaluation of soil degradation and soil C sequestration. To discuss the spatial-temporal dynamics of SOC in arable layer in reversed desertification area, a case study was conducted in Yulin City, Shaanxi Province, China. Data of SOC were based on general soil survey in 1982 and repeated soil sampling in 2003. Soil organic carbon content (SOCC) was determined by K2Cr3O2-FeSO4 titration method, and soil organic carbon density (SOCD) was calculated by arithmetic average and area weighted average method, respectively. On average, SOCC and SOCD of the arable layer in the study area from 1982 to 2003 had increased 0.5 Ig/kg and 0.16kg/m2, respectively. Considering main soil types, the widest distributed Arid-Sandic Entisols had lowest values and increments of SOCC and SOCD during the study period; while the second widest Los-Orthic Entisols had higher values and increments of SOCC and SOCD, compared to the mean values of the whole region. The results indicated that reversed desertification process was due to the modification of land use and management practices, such as natural vegetation recovery, planting grass, turning arable land to grassland, and soil and water conservation etc., which can improve SOCC and SOCD and thus enhance soil C sequestration.     

许家窑泥河湾组高分辨率磁性地层学研究

对许家窑泥河湾组两个平行剖面的高分辨率古地磁研究结果发现,在剖面的中下 部存在厚度约 １０ｍ（未见底）的巨厚负向极性带．根据正负极性带的相对位置及组合关系并 结合剖面附近相关层位火山豆的Ｋ－Ａｒ绝对年龄值进行分析认为,该负向极性带应为松山反 向极性时带．此结果否认了作者关于在遗址剖面底部存在Ｂｌａｋｅ反向极性偏移的结论．由此 推断,分布在许家窑一带的泥河湾组年代应为早更新世晚期至中更新世早中期．     

SPATIAL AND TEMPORAL DYNAMICS OF SOIL ORGANIC CARBON IN RESERVED DESERTIFICATION AREA——A Case Study in Yulin City, Shaanxi Province, China

1INTRODUCTIONDesertification is one of the most serious land degrada-tion, which results in the deterioration of physical, che-mical, and biological characteristics of soils (UNEP, 1992). Soil organic carbon (SOC) was considered to be a key index in evaluation of soil quality, soil degradation and soil C sequestration(SCHLENGSINGER etal., 1990; FENG etal., 2002; WANG etal., 2003). Many researchers have reported the correlations among desertification restoration, soil C s…     

塔里木盆地吐木休克断裂带的研究

研究区位于塔里木盆地的西部 ,以吐木休克断裂带为界将研究区划分为巴楚断隆和阿瓦提凹陷两个构造单元。在对吐木休克断裂带的几何学、运动学特征研究的基础上 ,指出该断裂带是沿着断层传播褶皱或断层转折褶皱轴面形成的右行逆冲走滑断裂带 ,对早期构造主要起破坏作用 ,它控制了巴楚断隆和阿瓦提凹陷的形成和发展。吐木休克断裂带的出现与印藏碰撞的远距离效应有关 ,其形成开始于老第三纪 ,至今仍处于活动状态     

无粘结部分预应力混凝土扁梁框架抗震性能试验研究

本文通过两榀按不同预应力度配置无粘结预应力筋、非预应力筋的“强柱弱梁”型无粘结部分预应力混凝土扁梁框架在水平低周反复荷载作用下的试验研究，探讨其包括裂缝分布、破坏形态、极限承载力、无粘结筋应力变化、位移延性、耗能能力等工作性能。     

两种摩擦耗能器的比较试验研究

对两种不同形式的摩擦耗能器进行了低周反复荷载试验。工其工作性能和耗能性能，并进行了带有不同摩擦片和不带摩擦片的对比试验，分析了影响耗能器性能的因素，试验结果表明，摩擦耗能支撑具有稳定的滞回性能和极好的耗能能力，摩擦片的类型与性能对摩擦耗能支撑的性能有较大的影响。     

一种断层影响基岩滑坡的失稳机理和稳定性分析

以某高速公路基岩滑坡为例．阐述了压性断层影响型滑坡的工程地质特点．总结了此类滑坡的失稳机理和失稳过程,并对拟建工况下的滑坡稳定性进行了分析。对此类工程的勘察、设计具有一定的指导意义。