天山北坡绿洲城市空间形态时空特征分析

借助GIS 软件支持, 综合遥感影像、地形图和其它空间数据, 提取天山北坡8 个绿洲城市 1990 年和2000 年建设用地图形信息, 计算1990 年和2000 年天山北坡8 个绿洲城市的平面轮 廓形状的分维数、紧凑度以及城市用地扩展类型, 讨论紧凑度与分维数的关系。研究结果表明, 天 山北坡绿洲城市形态总体特征表现为形状规则, 结构紧凑。1990~2000 年, 城市扩展类型主要为 外延型, 城市形态分维数增加, 紧凑度降低, 城市外部形态趋于复杂化和不规则化, 而内部结构趋 于松散化, 与同时期我国大部分城市的用地扩展方式有所不同。同时, 天山北坡绿洲城市形态特 征描述参数间存在着明显的幂函数关系, 并且是一种线性负相关关系, 即随着分维数的增加, 紧 凑度呈递减的趋势。     

热毯式海底热流原位探测系统设计

针对海底热流探针无法对基岩海底或其他硬质海底进行热流探测的难题,基于傅里叶热力学第一定律提出了非插入式海底热毯原位探测方法,介绍了热毯式热流原位探测系统的设计。通过试验选择了合适的热毯盖层材料、对热毯的形状和设计尺寸等参数进行了设计优化,分析了热毯的工作方式并对布放技术进行了评价。热毯式海底热流探测系统为大洋中脊区域海底的热流探测提供了有效的方法,对于研究板块的热状态及板块的构造活动提供了广阔的应用前景。     

天津玛钢厂杂填土(城市垃圾)地基强夯法加固

本文主要介绍在3-7m厚的城市垃圾填筑土上,采用强夯法加固修建厂房和办公楼的地基的实践经验,以及强夯法加固施工质量的检测手段和方法。通过这一工程实践,为今后城市建设少占良田、场地,合理利用垃圾填料进行建设,开辟了新的途径。     

A seismic interpolation and denoising method with curvelet transform matching filter

A new seismic interpolation and denoising method with a curvelet transform matching filter, employing the fast iterative shrinkage thresholding algorithm (FISTA), is proposed. The approach treats the matching filter, seismic interpolation, and denoising all as the same inverse problem using an inversion iteration algorithm. The curvelet transform has a high sparseness and is useful for separating signal from noise, meaning that it can accurately solve the matching problem using FISTA. When applying the new method to a synthetic noisy data sets and a data sets with missing traces, the optimum matching result is obtained, noise is greatly suppressed, missing seismic data are filled by interpolation, and the waveform is highly consistent. We then verified the method by applying it to real data, yielding satisfactory results. The results show that the method can reconstruct missing traces in the case of low SNR (signal-to-noise ratio). The above three problems can be simultaneously solved via FISTA algorithm, and it will not only increase the processing efficiency but also improve SNR of the seismic data.     

圆不锈钢管混凝土短柱轴压承载力性能研究

为了研究圆不锈钢管混凝土柱轴压承载力性能,在试验的基础上,利用有限元软件ABAQUS建立合理的有限元模型,并进行不同混凝土强度和约束效应系数参数化分析及不锈钢管和核心混凝土的轴力分配研究.结果表明:壁厚相同时,CFSST短柱的极限荷载增大幅度由大到小为:30MPa增加到40 MPa,50 MPa增加到60 MPa,40...     

我国海岸侵蚀的成因和防护措施研究

为解决当前我国海岸侵蚀现象严重以及海岸防护手段较为单一的问题,文章分析我国海岸侵蚀的成因,并从结构性措施和非结构性措施2个角度分析海岸防护手段,从而应对海岸侵蚀灾害。研究结果表明:导致海岸侵蚀的因素分为人为因素和自然因素,目前我国应对海岸侵蚀主要采取结构性措施,即从工程视角加强海岸防护,主要包括硬防护结构和软防护结构2种;未来将采取非结构性措施,即从社会科学的视角规范人类行为,从而对海岸进行防护,主要包括规划管理、法律政策和教育普及3个类型。     

淮北五沟煤矿F_（14）断层导水特征研究

五沟煤矿的F14断层为矿区内二采区的边界断层,落差较大且切割了多个含水层,造成主采10煤层、部分81、82煤在断层处与灰岩含水层＂对口＂接触。因此,在井巷工程揭露F14断层时,灰岩水有直接进入矿坑的可能性。在分析矿区地质及水文地质条件的基础上,根据断层带的岩性特征、抽水试验成果、物探及井下实际揭露等资料,并运用泥岩涂抹系数法,对F14断层的导水特征和封闭性进行了综合分析,得出了F14断层的导水性较差,断层封闭性较好的结论,为后续煤矿的安全生产提供了理论依据。     

利用ArcGIS Server和GeoGlobe软件实现天地图瓦片数据的切割

瓦片电子地图技术在目前的互联网地图服务应用中得到了比较普遍的应用,本文对瓦片电子地图技术的原理、"天地图"瓦片电子地图数据的组织结构等进行了详细的解释,结合国家"天地图"瓦片电子地图数据建设应用的实际情况,利用Arc GIS Server和Geo Globe软件实现了瓦片电子地图数据切图工作,取得了比较好的效果。     

多旋翼无人机航测系统在地形图测绘中的应用

多旋翼无人机是新兴的航空摄影测量手段,具有实用性与商业价值。本文探讨了其硬件基本组成、原理,阐述其飞行平稳、像幅小、基高比小等特点,有助于优化改进多旋翼无人机。介绍了最适合多旋翼无人机航摄系统的相机检校方案,有利于提高摄影测量的测图精度,提高地形图生产效率。同时,通过具体实验测试,对航摄成果精度进行评定与分析,论证其地形图测绘的可行性,为大比例地形图生产、自然灾害应急保障及科研活动提供参考[1]。     

Rheological Characteristics of Weak Rock Mass and Effects on the Long-Term Stability of Slopes

The creep deformation behavior of the northern slope of an open-pit mine is introduced. Direct shear creep tests are then conducted for the samples taken from the northern slope to study the rheological characteristics of the rock mass. The experimental results are analyzed afterwards using an empirical method to develop a rheological model for the rock mass. The proposed rheological model is finally applied to understand the creep behavior of the northern slope, predict the long-term stability, and guide appropriate measures to be taken at suitable times to increase the factor of safety to ensure stability. Through this study, a failure criterion is proposed to predict the long-term stability of the slope based on the rheological characteristics of the rock mass and a critical deformation rate is adopted to determine when appropriate measures should be taken to ensure slope stability. The method has been successfully applied for stability analysis and engineering management of the toppling and slippage of the northern slope of the open-pit mine. This success in application indicates that it is theoretically accurate, practically feasible, and highly cost-effective.