超浅层顶管施工诱发地表沉降规律分析     

张海生 《岩土钻凿工程》2014,(2):61-66

随着社会化进程的推进,顶管法在各类城市地下管线的施工中得到广泛应用。超浅层顶管施工。绝大多数是在已建道路下进行的,施工时,易发生地表沉降,且沉降量很大,易破坏路面。为此,超浅层顶管施工对周围环境的影响已引起人们足够的重视,其施工及控制技术是目前迫切需要掌握的。利用有限差分软件FLAC3D对顶管施工过程中地表沉降进行模拟,旨在了解超浅层顶管施工引起的力学效应。对超浅层顶管施工引起的地表沉降作出预测,为采取措施减小地表沉降提供依据。  相似文献   

武汉市油气库雷电预警服务系统设计与应用     

余蓉  杜牧云  李国梁  刘云鹏  梅春会 《湖北气象》2014,(4):407-412

依托湖北省气象局科技发展基金项目,湖北省防雷中心于2013年开发出武汉市油气库雷电预警服务系统。在介绍该系统设计思路、主要功能、运行流程的基础上,以2013年7月5—6日武汉市一次强降水过程为例,选取湖北省气象局所在地周边两家加油站作为服务对象进行系统应用测试,跟踪检测系统运行情况及服务效果。结果表明,雷电预警系统闪电监测准确,预警及闪电信息发布及时,服务对象对此反馈良好。  相似文献   

Estimating soil salinity in Pingluo County of China using QuickBird data and soil reflectance spectra     

《International Journal of Applied Earth Observation and Geoinformation》2014

Soil salinization is a worldwide environmental problem with severe economic and social consequences. In this paper, estimating the soil salinity of Pingluo County, China by a partial least squares regression (PLSR) predictive model was carried out using QuickBird data and soil reflectance spectra. At first, a relationship between the sensitive bands of soil salinity acquired from measured reflectance spectra and the spectral coverage of seven commonly used optical sensors was analyzed. Secondly, the potentiality of QuickBird data in estimating soil salinity by analyzing the correlations between the measured reflectance spectra and reflectance spectra derived from QuickBird data and analyzing the contributions of each band of QuickBird data to soil salinity estimation Finally, a PLSR predictive model of soil salinity was developed using reflectance spectra from QuickBird data and eight spectral indices derived from QuickBird data. The results indicated that the sensitive bands covered several bands of each optical sensor and these sensors can be used for soil salinity estimation. The result of estimation model showed that an accurate prediction of soil salinity can be made based on the PLSR method (R² = 0.992, RMSE = 0.195). The PLSR model's performance was better than that of the stepwise multiple regression (SMR) method. The results also indicated that using spectral indices such as intensity within spectral bands (Int1, Int2), soil salinity indices (SI1, SI2, SI3), the brightness index (BI), the normalized difference vegetation index (NDVI) and the ratio vegetation index (RVI) as independent model variables can help to increase the accuracy of soil salinity mapping. The NDVI and RVI can help to reduce the influences of vegetation cover and soil moisture on prediction accuracy. The method developed in this paper can be applied in other arid and semi-arid areas, such as western China.  相似文献   

挪威的油气资源管理与投资环境     

何金祥 《国土资源情报》2014,(4):24-28

挪威是世界上重要的石油生产国和出口国,对世界石油市场供需稳定有重要影响。本文在项目工作基础上,简要讨论了挪威油气资源管理与投资环境,包括油气资源潜力与油气工业概况、油气管理体制与框架、主要管理机构、主要油气法律、油气权设置、主要油气管理政策、油气税制等。  相似文献   

基于WebGIS的浙江省天然气调控应急保障气象服务系统     

沈萍月  潘娅英  骆月珍 《测绘与空间地理信息》2014,(11)

随着浙江省天然气供应规模的逐步扩大,应用领域的不断拓展,用WebGIS对天然气管线进行管理更显其优势。气象条件的变化与天然气供需有着密切的联系,本文基于WebGIS建立了浙江省天然气调控应急保障气象服务系统。对天然气管网数据进行了整理,并结合气象数据进行了分析和统一存储及管理。系统采用B／S架构,实现了天然气管道沿线实况监测、沿线天气预报、沿线气象历史资料查询、管网负荷预测、地图管理和操作、系统管理和维护等功能。探索了气象条件对燃气负荷的影响规律,能及时查询天然气沿线的天气实况和预报,为天然气调控应急保障提供了直观的气象服务和数据保障。  相似文献   

潍北凹陷孔店组二段页岩气资源潜力分析          下载免费PDF全文

彭文泉 《山东国土资源》2016,32(11)

潍北凹陷是昌潍坳陷的次一级凹陷盆地,也是胜利油田外围常规油气开采区。潍北凹陷孔店组二段发育了较厚的暗色泥页岩,是页岩气形成最有利层段,也是常规油气的生烃母岩。利用昌页参1井数据,结合以往资料,对潍北凹陷孔店组二段岩性特征,有机地球化学特征、矿物组成、泥页岩含气性特征等进行分析研究,认为孔店组二段上亚段下部和中亚段下部具备页岩气资源勘查开发潜力。  相似文献   

Study on founding of a residential–administrative complex in poor soil conditions in seismic prone region     

K. Talaganov  V. Sesov 《Soil Dynamics and Earthquake Engineering》2000,20(5-8):429-434

This paper gives a brief presentation of the study on foundation of a residential business complex. The unfavourable geotechnical conditions of the site considered led to the need to improve the natural foundation soil. The most favourable and rational solution for providing safety and stability of structures was the combination of gravel and a sub-base. Computations were done as follows: analysis of the stress–strain state by using the parameters of the natural non-improved soil and analyses performed by using the parameters of the improved soil. The results from these analyses were used for analysis of the integral soil–structure system. Hence, complete information on the possibility for optimisation of the foundation structure was obtained.  相似文献   

The use of 137Cs as a tracer in an erosion study in south limburg (the Netherlands) and the influence of chernobyl fallout     

A. P. J. De Roo 《水文研究》1991,5(2):215-227

The ¹³⁷Cs radioactivity of soils was used as a tracer of soil erosion in a catchment in the Netherlands: 143 samples were analysed to map the ¹³⁷Cs redistribution using geostatistical interpolation methods. Caesium-137 activities on grassland are significantly higher than on arable land. Also, ¹³⁷Cs activities on waning slopes are higher and activities on steep slopes are lower. The soil erosion estimates, derived from the ¹³⁷Cs data, are used to validate the USLE erosion model. The recent Chernobyl nuclear accident also contributed to the ¹³⁷Cs activity. However, the Chernobyl input of ¹³⁷Cs, with a constant ratio of 1.765:1 to ¹³⁴Cs, cannot be used as a tracer of soil erosion. Because of the rapid decay of ¹³⁴Cs, we will not be possible to separate the sources of ¹³⁷Cs in the near future in areas significantly influenced by Chernobyl fallout and in these areas ¹³⁷Cs can no longer be used as a soil erosion tracer.  相似文献   

油气田裂缝密度定量研究方法   总被引：1，自引：0，他引：1  

魏永佩  张之一 《地球科学与环境学报》1991,(1)

本文首先简要评述了目前研究裂缝方法的优缺点。用实例介绍了裂缝密度的定量估计方法,这种方法能将岩芯资料和地震资料有机地结合起来。应用这种方法不但能预测区域性裂缝及油气分布规律,而且能回答所获得成果的正确程度。  相似文献   

NUMERICAL MODELING OF CUMULUS CLOUD CHEMISTRY—PART Ⅰ.MODEL DEVELOPMENT     

赵春生  秦瑜 《Acta Meteorologica Sinica》1996,(3)

A one-dimensional cumulus cloud chemistry model(1CCCM)is developed to simulate cloudphysical processes and chemical processes during the evolution of a convective cloud.The cloudphysical submodel includes a detailed microphysical parameterized scheme of 20 processes.Thechemistry submodel is composed of three parts:gas phase chemistry,aqueous phase chemistry andscavenging of soluble gases.The gas phase reaction mechanism contains 85 reactions among 45species including 13 organics.The aqueous phase reaction mechanism contains 54 reactions among40 species and 12 ion equilibria.Mass of 19 gases is transported between the gas phase and theaqueous phase.With this model,studies may be made to analyze the interactions among processesduring lifetime of a cumulus cloud.  相似文献