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基于FLAC3D数值模拟的老采空区剩余沉降量分析计算—以山东枣庄安博化工项目为例

空区的剩余沉降值计算是采空区地质灾害危险程度一种定量分析的方法,利用FLAC3D直接模拟早期采煤形成的老采空区塌陷状态,计算出老采空区的剩余沉降量。以山东枣庄安博化工项目为例,首先采用物探、钻探手段探测老采空区深度、顶板塌落与破碎状况以及地质地层信息,其次结合岩心试验地质材料参数结果进行FLAC3D模拟,计算自重作用下采空区剩余沉降量,以及加载建筑后老采空区剩余沉降值,对比了传统概率积分法计算沉降值,结果基本一致,说明计算方法是可靠的。最后分析加载应力与破碎带剩余沉降值的数量关系。为老采空区土地稳定性评估以及剩余沉降量的计算方法提供科学依据与借鉴。     

加权最小二乘优化倾斜摄影测量模型矢量化精度方法研究

无人机倾斜摄影测量技术以高精度、高效率、大范围的方式全面感知复杂场景,通过专业的数据采集设备和建模软件恢复三维场景,再进行量测。市场上的三维测图软件大部分是基于立面散点正交原理,不能有效地减弱人工立体测图产生的误差。本文提出一种加权最小二乘直线拟合优化倾斜摄影测量模型矢量化精度的方法,选取南昌市桑海管理委员会部分区域进行地形图数据采集和精度评定,试验表明,采用本文方法所建立的立体测图模型精度提高了2 cm。     

A diagnostic analysis on the effect of the residual layer in convective boundary layer development near Mongolia using 20th century reanalysis data

Although the residual layer has already been noted in the classical diurnal cycle of the atmospheric boundary layer,its effect on the development of the convective boundary layer has not been well studied. In this study, based on 3-hourly20 th century reanalysis data, the residual layer is considered as a common layer capping the convective boundary layer. It is identified daily by investigating the development of the convective boundary layer. The region of interest is bounded by(30°–60° N, 80°–120° E), where a residual layer deeper than 2000 m has been reported using radiosondes. The lapse rate and wind shear within the residual layer are compared with the surface sensible heat flux by investigating their climatological means, interannual variations and daily variations. The lapse rate of the residual layer and the convective boundary layer depth correspond well in their seasonal variations and climatological mean patterns. On the interannual scale, the correlation coefficient between their regional averaged(40°–50°N, 90°–110° E) variations is higher than that between the surface sensible heat flux and convective boundary layer depth. On the daily scale, the correlation between the lapse rate and the convective boundary layer depth in most months is still statistically significant during 1970–2012. Therefore, we suggest that the existence of a deep neutral residual layer is crucial to the formation of a deep convective boundary layer near the Mongolian regions.     

利用IGS星历预报GPS卫星轨道

在动力学轨道拟合以及轨道积分的基础上,提出了基于IGS精密星历的GPS卫星轨道预报方法。该方法首先利用已知的IGS精密星历作为虚拟观测值,采用动力学方法拟合出GPS卫星的初始轨道和动力学参数,然后再通过积分来预报GPS卫星的轨道。主要讨论了基于不同弧段的IGS星历时,该方法对GPS卫星轨道的拟合和预报情况。研究结果显示:对于6 d弧段以内的IGS精密星历,其拟合轨道与IGS精密星历差值的三维RMS值均优于4 cm,随着拟合弧段的增加,拟合残差变大;当利用2～6 d弧段的IGS星历来预报GPS轨道时,大部分卫星第1天、第7天和第30天的三维预报精度可优于0.1 m、3 m和100 m。其中,2d弧段的IGS星历对GPS卫星第1天和第7天的预报结果最好,5 d弧段的IGS星历对GPS卫星第30天的预报结果最好。     

天津滨海新区地面沉降预测方法研究

利用1985～2008年天津地面沉降监测资料,以水准监测点为基本研究对象,在分析其时间沉降的变化动态基础上,采用分段权函数线性模型提取沉降信息并进行外推预测,展示了天津滨海新区地面沉降现状,编绘了2008年天津滨海新区地面沉降年度沉降分布图和2008～2013年间地面沉降总量的预测分布图研究成果可供政府及有关部门制定和实施控沉管理决策参考,同时对存在类似问题的区域也有一定的参考价值。     

Distribution and invasion of Spartina alterniflora within the Jiaozhou Bay monitored by remote sensing image

Spartina alterniflora as an alien invasive plant, poses a serious threat to the ecological functions of the coastal wetland of the Jiaozhou Bay. As of 2019, the distribution area of S. alterniflora in the Jiaozhou Bay has reached more than 500 hm². For this reason, combined with field surveys, remote sensing monitoring of the invasion S.alterniflora in the Jiaozhou Bay has been carried out. To accurately identify S. alterniflora within the Jiaozhou Bay coastal wetland, we used a new m...     

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