单向高压摆喷防渗墙不分序研究与应用          下载免费PDF全文

万翔鸿  李强  许小杰 《探矿工程》2011,38(3):58-60

高压摆喷防渗墙是成熟的施工工艺,其地层适应范围广,在国内的各种防渗工程中被广泛应用。常规的施工工艺分Ⅰ、Ⅱ序孔施工,在本工程通过试验与施工研究的不分序钻孔高喷工艺,不但有利于桩间搭接、加快施工工期,而且能够控制墙体厚度,为钻孔高喷防渗墙的推广应用奠定了基础。  相似文献   

海洋飞沫对热带气旋边界层结构的影响     

王平  陈葆德  曾智华 《海洋学报》2014,36(9):84-93

将海洋飞沫参数化引入到一个高分辨率、非静力中尺度WRF模式中,对0908号热带气旋Morakot进行数值模拟,探讨了海洋飞沫对热带气旋Morakot边界层结构和强度的影响。模拟结果表明:采用新参数化后,对热带气旋Morakot的强度预报有改进,但对热带气旋移动路径改进不大;其次,通过对边界层过程的改进,使得眼墙区域的平均径向风速、切向风速、温度、相对湿度、垂直风速、热通量,降水等物理量均有增强,各物理量的贡献对热带气旋Morakot强度和结构变化的影响十分重要。  相似文献   

重组鲑鱼降钙素结肠黏附缓释微球的制备     

宋益民  范鸣浩  杨青  张学成 《中国海洋大学学报(自然科学版)》2014,44(1)

为考察重组(酵母)鲑鱼降钙素结肠黏附缓释微球的制备工艺和最优处方,并对释药特性进行探讨。以阿拉伯胶、β-环糊精、可溶性淀粉、明胶为壁材,HPMC和卡波姆为生物黏附剂,运用正交试验确定喷雾干燥法制备微球的最佳工艺条件和处方。结果表明,微球的最佳制备工艺和处方为β-环糊精与阿拉伯胶以15∶1、HPMC与CP以4∶1配比为理想壁材,喷雾干燥进风温度160℃、进料速度10mL·min-1、雾化压力0.5MPa、壁材浓度15%、芯材比1∶3为最佳组合,所得微球能达到缓释12h的试验设计要求。本法工艺稳定、可行,所得鲑鱼降钙素结肠黏附缓释微球具有良好的缓释效果。  相似文献   

贯通式气动潜孔锤反循环钻进初探     

靳双喜  郭成林 《河南国土资源》1994,(2)

贯通式气动潜孔锤反循环钻进是以压缩空气作为碎岩动力和洗井介质，配用双壁钻杆，实现全孔反循环连续取芯（样）的钻进技术。本文在对反循环钻进机理分析的基础上，提出了反循环钻头的设计依据和原则，并依据野外生产试验资料，确定了贯通式气动潜孔锤反循环钻进的设备配套方案、钻进规程参数和工艺技术措施。  相似文献   

The Signature of Sea Spray in the Hexos Turbulent Heat Flux Data   总被引：7，自引：0，他引：7  

Edgar L Andreas  Janice Decosmo 《Boundary-Layer Meteorology》2002,103(2):303-333

The role of sea spray intransferring heat and moisture across the air-sea interface has remained elusive. Some studies have reported that sea spray does not affect the turbulent air-sea heat fluxes for 10-m wind speeds up to at least 25 m s^-1, while others have reported important spray contributions for wind speeds as low as 12 m s^-1. One goal of the HEXOS (Humidity Exchange over the Sea) program was to quantify spray's contribution to the turbulent air-sea heat fluxes, but original analyses of the HEXOS flux data found the spray signal to be too small to be reliably identified amid the scatter in the data. We look at the HEXOS data again in the context of the TOGA-COARE bulk flux algorithm and a sophisticated microphysical spray model. This combination of quality data andstate-of-the-art modelling reveals a distinct spray signature in virtually all HEXOS turbulent heat flux data collected in winds of 15 m s^-1 and higher. Spray effects are most evident in the latent heat flux data, where spray contributes roughly 10% of the total turbulent flux in winds of 10 m s^-1 and between 10 and 40% in winds of 15–18 m s^-1. The spray contribution to the total sensible heat flux is also at least 10% in winds above 15 m s^-1. These results lead to a new, unified parameterization for the turbulent air-sea heat fluxes that should be especially useful in high winds because it acknowledges both the interfacial and spray routes by which the sea exchanges heat and moisture with the atmosphere.  相似文献   

Stream water geochemistry from selected catchments on the Kola Peninsula (NW Russia)and in neighbouring areas of Finland and Norway: 1. Elements levels and sources     

Patrice de Caritat  Clemens Reimann  Matti Äyräs  Heikki Niskavaara  Viktor A. Chekushin  Vladimir A. Pavlov 《Aquatic Geochemistry》1996,2(2):149-168

The pH, electrical conductance and concentration of six anions and 33 cations were determined in stream waters sampled in 1994 from eight arctic catchments on and adjacent to the Kola Peninsula (Russia, Finland and Norway). The catchments are located at various distances (5–300 km) from the major industrial emissions centres of Monchegorsk, Nikel and Zapoljarniy in Russia. The source of the elements can be (1) natural, marine (sea spray), (2) natural, geogenic (blowing soil/dust, till, bedrock), and/or (3) anthropogenic, industrial (emissions from smelters, dust from mining, etc.), each source showing a distinct signature. The median concentration of many contaminants can vary by up to three orders of magnitude from polluted to remote locations, and the concentration ranges observed in different catchments often do not overlap. This implies that contamination falls sharply with distance from source, but is quite profound and lasting close to the emission centres. Elevated trace metal contents in the most polluted streams indicates that deposited contaminants are transferred to the aquatic ecosystem, and eventually can reach the ocean.  相似文献   

喷锚网防护技术在浙江某废弃采石场边坡治理中的应用     

王永  杜旭  姚辉磊 《地质灾害与环境保护》2008,19(2):86-89

随着“百矿示范,千矿整治”活动的开展与深入,浙江省内废弃矿山治理的工程项目日益增多。本文通过对浙江某废弃采石场边坡加固防护工程实践,介绍了喷锚网防护工程的设计思路、施工工艺和技术措施,以及现场质量管理和检测要点,为类似工程提供了可借鉴的设计、施工经验。  相似文献   

Effects of Sea-Surface Waves and Ocean Spray on Air-Sea Momentum Fluxes     

Ting ZHANG  Jinbao SONG 《大气科学进展》2018,35(4):469-478

The effects of sea-surface waves and ocean spray on the marine atmospheric boundary layer(MABL) at different wind speeds and wave ages were investigated. An MABL model was developed that introduces a wave-induced component and spray force to the total surface stress. The theoretical model solution was determined assuming the eddy viscosity coefficient varied linearly with height above the sea surface. The wave-induced component was evaluated using a directional wave spectrum and growth rate. Spray force was described using interactions between ocean-spray droplets and wind-velocity shear. Wind profiles and sea-surface drag coefficients were calculated for low to high wind speeds for wind-generated sea at different wave ages to examine surface-wave and ocean-spray effects on MABL momentum distribution. The theoretical solutions were compared with model solutions neglecting wave-induced stress and/or spray stress. Surface waves strongly affected near-surface wind profiles and sea-surface drag coefficients at low to moderate wind speeds. Drag coefficients and near-surface wind speeds were lower for young than for old waves. At high wind speeds, ocean-spray droplets produced by wind-tearing breaking-wave crests affected the MABL strongly in comparison with surface waves, implying that wave age affects the MABL only negligibly. Low drag coefficients at high wind caused by ocean-spray production increased turbulent stress in the sea-spray generation layer, accelerating near-sea-surface wind. Comparing the analytical drag coefficient values with laboratory measurements and field observations indicated that surface waves and ocean spray significantly affect the MABL at different wind speeds and wave ages.  相似文献   

海洋飞沫方案改进对台风“威马逊”强度预报的影响   总被引：1，自引：0，他引：1  

段自强  李永平  于润玲  黄伟  郑运霞 《海洋与湖沼》2016,47(6):1075-1090

本文采用分粒径段组合方式改进海气耦合模式海洋飞沫方案,并利用耦合模式对1409号台风"威马逊"进行数值模拟,分析了海洋飞沫方案改进对台风结构、强度以及海气动量通量、热量通量模拟结果的影响。结果显示,耦合模式中海洋飞沫方案可通过改变海表面粗糙度影响海气动量与热量通量;海洋飞沫还可以通过沫滴向大气输送感热和水汽而直接影响海气热通量,进一步影响台风的强度。模拟结果显示改进后海洋飞沫方案的台风强度更接近观测。改进海洋飞沫方案后粗糙度的计算结果小于原始方案,相应地海气热通量以及下垫面耗散作用也弱于后者,海表面风场是海气热交换与下垫面耗散共同作用的结果。  相似文献   

影响旋喷桩桩径因素的探讨     

龙纲要 《化工矿产地质》2003,25(4):247-250

通过采用单和管、双管法所做的4组不同条件下旋喷桩试验,对其结果进行分析,认为高压喷射范围取决于液流动能。设法降低管路中能量损耗和喷嘴对液流的阻力,合理配置水泥浆液,对提高液流的动能、增大旋喷桩桩径有着重要的作用。  相似文献