岷江双线特大桥高边坡稳定性研究   总被引：1，自引：0，他引：1  

陈行  邱敏  彭雅婷  龙雪梅  邹祖银 《地质力学学报》2015,21(1):108-116

成兰铁路岷江双线特大桥高边坡位于岷江地震带,该区域属于高烈度地震强震频发区,降雨量大且集中,不良地质分布广,在复杂环境因素的影响下,极其容易引起边坡滑坡。在研究现场工程地质情况的基础上,利用FLAC3D有限差分软件,建立三维边坡模型,进行天然、降雨、地震及降雨-地震耦合工况下的稳定性分析。研究结果表明,天然工况下安全系数为1.318,边坡处于稳定状态;降雨工况下,随降雨量的增加,雨水入渗和加载作用增强,位移高值区逐步扩大并逐渐向坡脚延伸,25 mm/d、35 mm/d及45 mm/d降雨条件下的安全系数分别为1.001、0.932、0.912;地震工况下边坡不稳定,坡腰中上部位移与加速度最大,为易滑坡区域;降雨-地震耦合工况下,坡腰中上部极其不稳定,且随降雨量增加,滑体位移及加速度均增大。  相似文献   

黑色岩系型矿床与页岩气藏之间的耦合关系   总被引：1，自引：0，他引：1  

毛玲玲  朱正杰  双燕  向宇 《矿物学报》2015,35(1):65-72

黑色岩系,作为众多多金属矿床的矿源层,具有重大的经济和科研价值而广受国内外学者关注。中国南方下寒武统黑色岩系中广泛产出大中型金属型矿床,如Ni-Mo矿、V矿及PGE矿。但同时作为能源矿产的页岩气在下寒武统黑色岩系中也广泛成藏,因此有必要研究两者之间的耦合关系。本文综述前人已经发表的黑色岩系的一些地球化学特征,特别是有机地球化学特征,初步揭示金属成矿与页岩气成藏之间的耦合关系,研究成果有利于进一步探讨黑色岩系型金属成矿与页岩气成藏的沉积古环境,对指导金属矿床与页岩气藏资源协同勘探及综合预测及开发具有重大科学意义。  相似文献   

石臼坨凸起明化镇组下段油气藏富集规律探讨     

李鲜蓉  孙国智  李转红  王爱国 《地下水》2015,(4)

石臼坨凸起油气富集程度受岩性-构造控制,油源,储层,运移是影响油气富集条件的最主要的影响因素;通过油源对比、储层发育特征及运移能力分析,结果表明以渤中凹陷烃源岩为油源的石臼坨凸起南侧、构造高部位、断砂耦合长度较长的砂层段,一般含油丰度、油柱高度较高,油气较富集,石臼坨凸起南侧断层比较发育,砂体纵向叠合性好的部位是较有利勘探区。  相似文献   

黔东北高原斜坡地区4种岩溶地下水系统模式及特点——基于地貌和蓄水构造特征   总被引：5，自引：0，他引：5  

潘晓东  梁杏  唐建生  苏春田  孟小军 《地球学报》2015,36(1):85-93

受深切河谷地貌控制,黔东北大部分地区岩溶地下水深埋且排泄于河谷岸边,以快速的管道裂隙流为主,给地下水资源勘探开发带来了极大的困难,局部地区受蓄水构造控制形成勘探有利的地下水富集区。笔者基于地貌和蓄水构造将研究区岩溶地下水系统归纳总结为深切河谷型、向斜山地型、单斜夹层型和背斜槽谷型4类模式。深切河谷型岩溶地下水系统地下水水力坡度大,地下水以快速的管道流为主,排泄点低,开发利用方式建议直接在地下河出口或天窗中抽提地下水,经济效益明显地区可堵洞成库进行综合利用;向斜山地型岩溶地下水系统发育高位岩溶泉或地下河出口,排泄点高,适合直接引水利用;单斜夹层型岩溶地下水系统在岩性接触带出露一系列接触泉,排泄分散,开发利用方式建议直接利用或抽提岩溶泉水,受夹层隔水顶底板影响局部地区可钻井取水;背斜核部出露寒武系白云岩地层,导致背斜槽谷型岩溶地下水系统含水岩层均匀厚度大,分布大量非全排型岩溶泉,地下水开发适合抽提泉水或钻井抽取地下水。  相似文献   

地铁换乘站基坑变形流固耦合数值分析研究          下载免费PDF全文

朱恒华  卫如春  贾超  唐俊平  李双 《山东国土资源》2021,37(12)

地铁换乘站基坑在施工过程中要严格控制其变形及对周边环境产生的影响。尽管流固耦合与非流固耦合分析结果有一定差异,但现有地铁换乘站基坑开挖变形计算中较少考虑流固耦合作用。本文针对济南长途汽车站地铁换乘站进行基坑变形分析,建立了考虑流固耦合的三维有限元模型,根据模拟结果,确定出地连墙最大侧向位移及地面沉降最大值发生的位置,并对地铁换乘站基坑变形规律进行了总结和分析。本文研究成果可以为类似地下工程基坑分析计算和施工设计提供有益参考与借鉴。  相似文献   

中亚地区土地与人口城镇化时空耦合特征          下载免费PDF全文

夏怀霞  梁涵玮  陈爽  王倩  王慎敏 《干旱区地理》2023,46(1):115-126

中亚作为丝绸之路经济带的重要枢纽,其土地与人口城镇化间的协调发展不仅影响中亚地区社会经济的可持续发展,同时能够推动“一带一路”倡议的实施。基于中亚五国首都2000—2019年城市土地和人口数据,采用城市扩张模式指数、人口集中指数、等扇分析法和空间耦合协调模型等方法,研究了城市土地扩张与人口增长的时空耦合特征。结果表明：（1）从空间演变特征看,中亚五国首都城市土地扩张模式类型主要以蔓延式为主,扩张模式指数整体呈先上升后下降趋势;人口集聚特征上,阿什哈巴德人口集中度呈上升趋势,杜尚别和努尔苏丹呈下降趋势,塔什干和比什凯克的人口集中指数在0.6～0.7之间波动变化。（2）从空间增长趋势看,比什凯克、阿什哈巴德和努尔苏丹城市土地与人口扩展方向基本相同,塔什干稍有偏差,杜尚别差异较大。（3）从耦合协调特征看,塔什干土地与人口间的耦合性和协调度都偏低,其城镇化协调发展处于起步阶段;杜尚别和比什凯克耦合性较好,但协调度变化较大,处于波动阶段;阿什哈巴德和努尔苏丹协调度较高,处于稳定阶段。  相似文献   

基于多源数据的南京市域城乡融合水平测度研究     

谢智敏  甄峰 《地理科学》2023,43(1):1-10

以特大城市南京市作为实证分析对象,通过耦合协调度和二分K均值聚类算法进行量化评价,利用多源数据创新市域城乡融合水平测度的思路与方法,探索性构建由城镇化发展水平、土地集约利用水平、设施均等化水平与城乡联系水平四大子系统所组成的评价指标体系。分析结果表明：(1)南京市域城乡融合系统耦合协调度的空间分布呈现出圈层扩散与点轴扩散并存的蛛网结构;(2)各子系统发展水平的分布特征具有一定差异,其中土地粗放利用与设施建设短板是制约发展协调地区进一步提升的关键因素,发展失调地区多受限于交通区位,城乡联系较为薄弱,因而发展动力不足。(3)各项指标发展水平的聚类特征明显,呈现出城市、城市边缘、小城镇、乡村4级9类的城乡融合单元。其中城市边缘地区细分为边缘新城、郊区副城、郊野公园3类单元,乡村地区则包括城市辐射型、观光休闲型、人口聚居型与偏远独立型4类。  相似文献   

Spatio-temporal analysis of human wellbeing and its coupling relationship with ecosystem services in Shandong province,China     

Wang  Chao  Wang  Xuan  Wang  Yifan  Zhan  Jinyan  Chu  Xi  Teng  Yanmin  Liu  Wei  Wang  Huihui 《地理学报(英文版)》2023,33(2):392-412

Journal of Geographical Sciences - Rapid economic and social change promotes to improve human wellbeing (HW), but poses threats to ecosystems and the environment. Studying the coupling relationship...  相似文献   

生计资产差异对农户耕地保护经济补偿模式选择的影响(英文)     

李广东  方创琳  邱道持  王利平 《地理学报(英文版)》2014,(2)

With rapid urbanization and the socio-economic transformation, cultivated land protection has gradually become a major concern in China. The economic compensation plays a crucial role in promoting cultivated land protection and improving the utilization ratio of cultivated land. Farmer household's satisfaction has a great influence on the effectiveness of compensation. Therefore, households' willingness to select the economic compensation pattern for cultivated land protection has been considered and re-examined. By employing Participatory Rural Appraisal method(PRA), 3 villages and 392 households were investigated and sampled in mesa and hilly areas of Chongqing. Then a quantitative analysis framework of household livelihood hexagon has been developed to quantify the livelihood assets of different farmer households. Finally, the Gray Relation Model and Probit Regression Model have been employed to explore the coupling relationship between the household livelihood assets and their compensation pattern options. The results show that there are both qualitative and spatial heterogeneity in household livelihood assets. We found that the inequality of livelihood assets is evident for five household types. There is a spatial trend that the higher the elevation, the less livelihood assets are. In addition, their options of economic compensation pattern vary from Chengdu Pattern to Foshan Pattern due to their difference in livelihood assets and difference in location. In detail, there is a coupling relationship between household livelihood assets and their compensation pattern; negative correlation is observed between natural assets value and household pattern options, while the other livelihood assets have positive impacts on compensation pattern in varying degrees, which from the top are psychological assets, human assets, physical assets, financial assets, and social assets respectively. A conceptual compensation pattern system has been designed to meet the demands for farmer households mainly according to their shortage in livelihood assets. In addition, compensation method, compensation standard, the basis of compensation and the source of compensation funds have been proposed accordingly.  相似文献   

Mining candidate causal relationships in movement patterns     

Susanne Bleisch  Matt Duckham  Antony Galton  Patrick Laube  Jarod Lyon 《International journal of geographical information science》2014,28(2):363-382

In many applications, the environmental context for and drivers of movement patterns are just as important as the patterns themselves. This article adapts standard data mining techniques, combined with a foundational ontology of causation, with the objective of helping domain experts identify candidate causal relationships between movement patterns and their environmental context. In addition to data about movement and its dynamic environmental context, our approach requires as input definitions of the states and events of interest. The technique outputs causal and causal-like relationships of potential interest, along with associated measures of support and confidence. As a validation of our approach, the analysis is applied to real data about fish movement in the Murray River in Australia. The results demonstrate that the technique is capable of identifying statistically significant patterns of movement indicative of causal and causal-like relationships.  相似文献