强夯在高路堤填筑上的应用   总被引：11，自引：0，他引：11  

王钊  姚政法  范景相 《岩土力学》2002,23(4):498-503

介绍强夯法在填筑运城－三门峡高速公路的一个41高路堤中的应用。分析了夯期检测和长期监测的结果，并与分层碾压法进行比较，说明强夯法具有压实度高，含水量适宜的范围宽和施工速度快的优点，可在高填方工程中推广应用。还简要介绍了袋装砂井在过湿土地基处理中的应用。  相似文献   

广东省道S362线番禺沙湾至紫坭段软土特征及处理措施     

徐利成  谢色新 《湖南地质》2002,21(3):201-206

阐述了省道S362线番禺沙湾至紫坭段软土路段的物理力学性质及软土地基处理措施，并对各种处理措施进行比较。  相似文献   

Fuzzy Logic System for Road Identification Using Ikonos Images   总被引：1，自引：0，他引：1  

Jalal Amini  Caro Lucas  Mohammad Saradjian  Ali Azizi  & Saeed Sadeghian 《The Photogrammetric Record》2002,17(99):493-503

Research into both extraction of man-made objects and automatic change detection from aerial and satellite images has made significant progress in recent years. This paper presents an approach, based on a fuzzy logic system, for the identification of suburban roads in Ikonos images. The linguistic variables are the mean and standard deviation (SD) of different objects with Gaussian membership function. After the roads have been identified provisionally and their skeleton extracted, the skeleton can be vectorised and then used as direct input to a GIS for further analysis. The method was tested on an Ikonos "Geo" image covering Bilesavar in north-western Iran. For the suburban area of Bilesavar, the results showed that grey scale values ranged from 20 to 190 for non-roads and 226 to 228 for roads, the optimum width of the Gaussian kernel function was 3 and the SD was 0.4. It was also found that about 91% of main roads with a width of 6 to 12 pixels could be extracted from high resolution satellite imagery by the algorithm. The computer program for this study has been developed in visual C++ based on Windows 98  相似文献   

浙江省高速公路路面温度预报模型性能检验及应用     

邱金晶  陈锋  张珏  倪思聪 《气象科技》2020,48(4):518-528

基于地表能量守恒方程和陆面模式土壤温度计算模块,建立高速公路路面温度预报物理模型。利用2014年6月1日至2015年5月31日8个常规气象观测站和6个交通自动气象监测站逐小时观测资料对模型预报产品进行评估检验,结果表明:预报效果随提前量的减小而提高,常规站(交通站)提前1h和6h预报的平均绝对误差分别为1.64℃(1.82℃)和3.27℃和(3.69℃)。由模型对输入气象要素的敏感性分析得出:模型对2m气温最敏感,其次是相对湿度、总云量,且敏感性随着预报提前量的增加而增强。结合浙江省快速更新同化系统数值预报产品,建立浙江省高速公路路面温度预报系统,为全省提供逐12h更新、12h预报时效的逐小时高速公路路面温度精细化预报,系统提前1h和11h预报常规站(交通站)的平均绝对误差分别为2.81℃(3.23℃)和2.50℃和(2.93℃),系统对极端高(低)温预报具有较高的预报技巧。  相似文献   

Stabilization of lateritic soils with phosphoric acid   总被引：1，自引：0，他引：1  

J. Medina  H. N. Guida 《Geotechnical and Geological Engineering》1995,13(4):199-216

Summary This paper describes a laboratory study on the stabilization of lateritic soils with phosphoric acid-H₃PO₄. This method is most promising for road and airport pavement construction in tropical regions where fine textured lateritic soils (red clays and silts) occur over large areas. The iron and aluminum phosphates formed are hard and insoluble. The main source of iron is free iron oxide, and the aluminum sources are free aluminum oxide, exchangeable cations and clay minerals (hydrated aluminum silicates). Four different soil samples were studied, but the most comprehensive study was carried out with a lateritic soil evolved from weathered basaltic bedrock. The variables of the test specimens were: percentage of acid, moulding water content, compaction energy, and curing time. Strength tests performed were the axial or unconfined compression test and the indirect tensile or diametrical compression test. With 5% of phosphoric acid to dry weight of soil, values of compressive strength around 4.0 MPa were obtained after 28 days curing.  相似文献   

遥感图像中城市道路信息的自动识别与制图     

高芳琴  吴健平 《测绘与空间地理信息》2001,24(3):27-29

遥感图像中的地物自动识别一直是图像处理中的研究热点,本文在彩红外航空图像中计算机自动识别提取城市道路上做了一些尝试,将形状指数作为光谱分类后的后处理,并通过人机交互修正分类结果.提取后的道路信息将通过自动制图功能形成矢量格式的地理底图.系统采用VC++6.0语言设计完成.  相似文献   

新疆奎赛段公路工程地质问题及重要工点地质评价     

陆关祥  腾志宏  郝建荣 《西北地质》2001,34(3):40-46

采用彩色红外航空像片，遥感图像处理与野外实地考察相结合的综合研究，详细解释了新疆奎赛公路段的各种不良工程地质问题，并进行了重要工点的水文地质工程地质评价，为我国西部开发过程中，迅猛发展的工程项目的遥感质量调查及工程地质评价提供了科学的参考资料。  相似文献   

Towards understanding the behaviour of naturally-occurring road construction materials     

D. G. Toll 《Geotechnical and Geological Engineering》1991,9(3-4):197-217

Summary Naturally-occurring road construction materials generally contain a greater amount of fines, and the fines have a higher plasticity than traditional materials such as a crushed rock aggregates. This makes their behaviour more difficult to understand and predict since soil suction and fabric become important controlling factors. The concepts of suction and fabric are outlined, and their role in controlling the behaviour of road construction materials is illustrated by a fundamental laboratory study of a lateritic gravel and two calcrete gravels. These materials have successfully been used as road base construction materials in low-volume bituminous-surfaced roads in Kenya and Botswana. It is concluded that the presence of fines can be an advantage, since they allow significant suctions to develop and also reduce the permeability.  相似文献   

Scale-free Structure of Town Road Network in Southern Jiangsu Province of China     

SU Weizhong YANG Guishan YAO Shimou YANG Yingbao 《中国地理科学(英文版)》2007,17(4):311-316

From the viewpoint of Graph Theory this paper builds a town road network graph of regional scale, and proposes numerical vertex degree (Di), rank vertex degree (Dr) and population size vertex degree (Dp) on the base of vertex degree (D). Then the indicators of Di, Dr, Dp and mathematical statistics methods are applied to investigating scale-free structure of town road networks in the southern Jiangsu Province. The results show that the distribution of Di does not exhibit scale-free properties, but Dr and Dp do. Additionally the correlation coefficient between Dp and Di is only 0.569, but the spatial correlation between Dp and Dr is very evident on the base of correlation analysis and spatial analysis of GIS. The mutual mechanism between Dp and Dr spatially represents a "Core-Belt" model of town development of regional scale. The town development model is open and clustered, and beneficial to both economic development and ecological protection. And then we suggest that Suzhou City, Wuxi City, Changzhou City and Wujin City control towns' high-density pattern by conducting centralization and consolidation policies, and properly controlling and planning higher rank roads; whereas Nanjing City, Zhenjiang City, Jintan City and Liyang City must strengthen the development of towns along higher rank roads.  相似文献   

三轴水泥土搅拌加固地基的应用与控制     

斯碧峰 《上海国土资源》2009,(4):4-7

文章阐述了三轴深层水泥土搅拌加固桩在浦东机场地道工程中的应用情况,并针对深层水泥土搅拌桩各个施工环节,提出了相应的质量控制措施.  相似文献