粘土中胶粒对密度计法颗粒分析试验的影响的探讨

粘土胶粒具有沉降、絮凝及反离子交换作用,这些特性均会影响密度计法颗粒分析试验成果的合理性.针对密度计法颗粒分析试验的原理及粘土中胶粒特性对颗粒分析试验结果的影响,提出合理的解决办法.从而选择合适的试验时间、试验温度及分散剂.以提高密度计法颗粒分析试验成果的质量.     

MS2000 激光粒度仪与密度计法的土工颗分对比试验

激光粒度仪已经在越来越多的领域得到广泛的应用，并且在水库、河道的悬移质和推移质泥沙颗粒粒度测量分析上发挥了很好的作用；然而，激光粒度仪在土工颗粒分析试验中还没有得到应用，激光粒度分析仪进行颗粒分析具有快速、方便的特点，把其引进到土工颗粒分析试验中将具有创新意义。本文对激光粒度仪与密度计法的相关性、试验结果的相互转化关系进行了系统的研究，为激光粒度仪在土工颗粒分析中的成功应用奠定基础。     

颗粒分析比重计法成果的简捷计算法

采用比重计法刊物土颗粒试验的成果整理，一般需根据实测值先查图表，得到一些校正值和系数，然后计算出结果。查图表比较繁琐费时，工作效率不高，并且容易出现制图和查图的双重误差。     

不同分散剂对黄土颗粒分析试验结果的影响

黄土中由于富含有碳酸盐胶结物而具有独特的团聚体结构,对黄土的颗粒分析试验具有一定的影响。通过密度计法研究六偏磷酸钠、焦磷酸钠、草酸钠、氢氧化钠、氨水等分散剂对黄土颗粒分析试验结果的影响。研究结果表明：六偏磷酸钠具有良好的分散性和稳定性,黄土宜采用4%的六偏磷酸钠作为分散剂。     

土粒密度试验的图算法

根据土工试验中颗粒密度试验计算的相关公式，制作出相应的诺模图算法，从而大大简化了计算工作，并保证了成果精度要求。     

颗分试验中误差对试验结果的影响分析

颗粒分析试验是土工基本试验之一，其方法主要是筛析法及密度计法。筛析法存在三种随机误差。密度计法不仅存在随机误差，而且由于所用方法、仪器设备的原因而存在系统误差。认识这些误差的存在及其原因，才能寻找相应的对策以减少或减轻误差，使试验结果更接近土的实际状况。     

用土量对密度计法颗分结果的影响

通过试验分析了用土量对密度计法颗粒分析结果和土质分类的影响,结果表明:颗粒级配曲线随着试验用土量的增加向上抬升,但增幅随着用土量的增加而逐渐降低,沙土级配曲线比黏土级配曲线受用土量影响大;当试验用土量为20～50 g时,级配曲线没有显著变化,也不会影响土质的分类结果,而当用土量少于20 g时会显著影响级配曲线测量结果。     

激光粒度仪在土工颗粒分析中的应用研究

激光粒度仪具有测试速度快、操作方便、重复性好、测试范围宽,能保持土颗粒的完整性等优点,在泥沙颗粒粒度分析中已经得到成功运用,但在土工颗粒分析中应用还较少。通过对激光粒度仪法与密度计法的对比试验,探讨了前处理在激光粒度仪土样测试中的重要性。对两种土工颗粒试验结果进行了对比分析,并建立了结果相互转化的回归方程。对激光粒度仪在土工颗粒分析中的推广应用具有参考价值。     

土工试验中的抗剪强度分析

对土工试验中直接剪切试验与三轴压缩试验所得的抗剪强度进行了比较与分析,从而对工程不同要求提出不同的试验方法.     

粗粒土试样橡皮膜嵌入影响的初步研究

针对直径为 30 0 mm的粗粒土试样 ,通过在试样周围填充细砂的方法来消除橡皮膜嵌入的影响。饱和固结不排水往返加荷三轴试验表明 ,由于橡皮膜嵌入的影响 ,延缓了孔隙水压力的上升 ,使试样的液化应力比增大 1 4%～ 1 8% ,在应用试验资料时 ,应予修正     

EXPERIMENTAL STUDY ON ABSORPTION OF OIL BY SEDIMENT IN WATER

The absorption behaviour of emulsified oil by sediment (include loess) is studied by experiment. The absorption equation and the relations of absorption capacity with sediment concentration, grain size, salt concentration and temperature are analyzed. The absorbing reaction kinetics process is also studied. The absorption of emulsified oil by sediment in rivers is agreed with the Langmuir-Freundlich absorption equation. Experimental data shows that the larger the equilibrium oil concentration and the salt concentration , the more the absorption capacity. The absorption capacity increases immensely with grain size and temperature reduction.     

STUDY ON FLOWS THROUGH CENTRIFUGAL PUMP IMPELLER BY TURBULENT SIMULATION

A finite volume numerical method is presented for simulating internal tur-bulent flows on the blade-to-blade surface through a centrifugal pump impeller, in which, a mesh in body-fitted coordinates is generated for the computation. In detail, the SIM-PLEC algorithm is utilized for solving governing equations of incompressible viscous/turbulent flows through the pump impeller. The K-ε turbulence model is adopted to describe the turbulent flow process. Some worthwhile simulated results are presented.     

THE UNITED METHOD FOR THE CALCULATION OF SEEPAGE CONTROL BY ADOPTING WEIGHTING SOIL LAYER ON THE BACK SIDE OF DIKE

1 .　ＩＮＴＲＯＤＵＣＴＩＯＮＩｎＣｈｉｎａ ,ｍｏｓｔｏｆｄｉｋｅｓａｒｅｂｕｉｌｔｏｎａｌｌｕｖｉａｌｆｉｅｌｄｓｃｏｍｐｏｓｅｄｏｆａｗｅａｋｌｙｐｅｒｖｉｏｕｓｌａｙｅｒｃｏｖｅｒｉｎｇａｓｅｒｉｅｓｏｆｐｅｒｖｉｏｕｓｏｒｓｅｍｉ ｐｅｒｖｉｏｕｓｌａｍｅｌｌａｅｓｈｏｗｎａｓＦｉｇ .1.Ｗｈｅｎｔｈｅｒｉｖｅｒｈａｓｈｉｇｈｗａｔｅｒｌｅｖｅｌ,ｓｅｅｐａｇｅｆａｉｌｕｒｅｓｗｉｌｌｍｏｓｔｌｙｏｃｃｕｒｉｎｔｈｅｌａｙｅｒｅｄｆｏｕｎｄａｔｉｏｎ .Ｔｈｅｔｈｅｏ ｒｙｆｏｒｃａｌｃｕｌａ…     

抚河流域水土流失发展态势研究

利用江西省抚河流域的6个泥沙站长系列水文样本资料,分析河流泥沙变化规律,研究水土流失现状、原因、发展态势、水土流失对水环境的影响,提出防治对策,为水土保持、防洪、航运、河道治理、水利工程安全运行、泥沙站网的合理布设提供科学依据.     

坑内加固对围护结构侧向位移影响的实测分析

基坑围护结构墙体的侧向位移是基坑开挖与施工中首要控制的变量 ,也是基坑施工中的关键变量。通过基坑坑内的加固 ,对控制围护墙体坑底位移是非常有效的一项措施。文章针对上海市黄浦江行人隧道浦东竖井的基坑开挖 ,对坑内加固的效果以及墙体侧向位移进行了实测分析 ,讨论了不同加固方法对改善和提高坑内土体力学参数的效果 ,以及不同加固方式对墙体位移的影响     

A STUDY ON NONEQUILIBRIUM TRANSPORT OF NONUNIFORM BEDLOAD IN STEADY FLOW

In the case of steady flow, an equilibrium state for an alluvial reach referring tothe input of sediment over a sufficiently long time (time interval in the order of months) is equalto the output of sediment. A nonequilibrium state exists under steady flow when the sedimenttransport rate changes with time and space, so that there is no balance between input and outputof sediment. The experiments were performed in an open circuit tilting flume with the bed slope of 0.001-0. 009, the flume length of 30m and flume width of 0. 5m. The boundary condition atupstream and in all experiments, the rate of sedimant supply was zero. The coal or sand was se-lected as the Wed material. The grain diameter of the bed material varied in the range of 0.05-20. 00ram. The equation of nonequilibrium transport of nonuniform bedload is derived. Thegrain distribution of the size distribution of bedload is calculated by modified Gessler's formula.The grain size distribution of bed material is calculated by CARICHAR mixed layer model. These equations are applied to numerical simulation of armoring of riverbeds. The results ofthe bedload transport rate and the grain size distribution of the bedload at the end of the down-stream in the process of time, as well as the grain size distribution of the bed material in the pro-cess of time and distance are all in close agreement with the measurements.     

对我省水资源供需平衡分析计算中若干问题的探讨

对水资源供需平衡分析中可供水量的计算及代表年的分区选择提出自己的见解，并就渠系水有效利用系数和工业用水重复利用率对供需平衡结果的敏感性作了具体分析。     

水土流失对樟树市江河防汛抗旱的危害与防治对策

介绍了水土流失对樟树市江河防汛抗旱的危害及相应的防治对策．