Study on Dynamic Response of the “Dualistic” Structure Rock Slope with Seismic Wave Theory

Currently, scant attention has been paid to the theoretical analysis on dynamic response mechanism of the ＂Dualistic＂ structure roek slope. The analysis presented here provides insight into the dynamic response of the ＂Dualistie＂ structure rock slope. By investigating the principle of energy distribution, it is shown that the effect of a joint plays a significant role in slope stability analysis. A dynamic reflection and transmission model （RTM） for the ＂Dualistic＂ structure rock slope and explicit dynamic equations are established to analyze the dynamic response of a slope, based on the theory of elastic mechanics and the principle of seismic wave propagation. The theoretical simulation solutions show that the dynamic response of the ＂Dualistic＂ structure rock slope （soft-hard） model is greater than that of the ＂Dualistic＂ strueture rock slope （hard-soft） model, especially in the slope crest. The magnifying effect of rigid foundation on the dynamic response is more obvious than that of soft foundation. With the amplitude increasing, the cracks could be found in the right slope （soft-hard） crest. The crest failure is firstly observed in the right slope （soft-hard） during the experimental process. The reliability of theoretical model is also investigated by experiment analysis. The conclusions derived in this paper could also be used in future evaluations of Multi-layer rock slopes.

The Chinese Urban-rural Dual Economic Structure Model and Analysis

Based on the characteristics of urban-rural dual economic structure in China,we build a dynamic endogenous urban-rural dual economic model closely linked to China's reality,and carry out mathematical economics analysis of optimized conditions for urban and rural sectors. The main results show that:(i) The labor growth rate of urban-rural sectors must be greater than the time discount rate,or else there would be a vicious cycle of diminishing returns in the sectors;(ii) The accumulation rate of physical capital and human capital of urban-rural sectors,and the rate of technological progress,need to be greater than the corresponding depreciation rate plus the time discount rate,otherwise there would be a vicious cycle of diminishing returns in the sectors;(iii) The low accumulation rate in the rural sector,and the occurrence of labor outflow,human capital loss and lack of investment,will expand income gap between urban and rural areas,which is a reason for solidification of urban-rural dual economic structure.

Explore economic restructuring Institutional Analysis based on the urban-rural dual economic structure

China＇ s urban and rural economic and social structures are persisted, perfectly shaped, very typical. Since the new century, the Chinese government began to adjust serious distorted urban-rural relations. New rural construction, total abolition of agricultural tax, the construction of modern agriculture and other major strategic decisions have been introduced; free compulsory education in rural areas, the new rural cooperative medical care, rural public infrastructure, cultural services and other specific measures have been rolled out building. But these still can not slow down our growing urban-rural gap, China＇ s economic and social development is still running under the urban and rural pattern, and the trend has increased.

The Impact of the Upgrading of Industrial Structure in the Yangtze River Delta on the Urban-Rural Income Gap

Firstly,this paper conducts theoretical analysis and current situation analysis,and then proposes research hypotheses.Secondly,using spatial Dubin model and partial differential method,it empirically studies the impact of industrial structure advancement and rationalization on the urban-rural income gap.The results show that:(1)Both industrial structure and urban-rural income gap have significant spatial dependence;(2)The increase in the industrial structure rationalization will narrow the urban-rural income gap in local region,while its spillover effect on neighboring areas is not obvious.(3)The impact of the industrial structure advancement on the urban-rural income gap is not linear.It is first expanded and then narrowed.The industrial structure advancement in the Yangtze River Delta will generally narrow the urban-rural income gap at this stage.Finally,this paper put forward relevant suggestions.

Development Path of Urban-rural Integration

The urban and rural areas are regarded as two major components of the regional economic system. Only through joint balanced development of the two can we achieve overall economic optimization and social welfare maximization. But the great social division of labor has separated urban areas from rural areas,which casts the shadow of city-oriented theory on cooperative relations between urban and rural areas. Mutual separation between urban and rural settlements and independent development trigger off a range of social problems. We must undertake guidance through rational development path of urban-rural integration,to eliminate the phenomenon of urban-rural dual structure,and promote the sustainable development of population,resources and environment in urban and rural areas as soon as possible.

Spatial pattern of urban-rural integration in China and the impact of geography

Urban-rural integration (URI) is a global challenge that is highly related to inequalities, poverty, economic growth, and other Sustainable Development Goals (SDGs). Existing research has evaluated the extent of URI and explored its influencing factors, but urban-rural linkages are seldom incorporated in evaluation systems, and geographical factors are rarely recognized as the influencing factors. We construct a URI framework including regional economy, rural development, urban-rural linkage, and urban-rural gap. Based on a dataset consisting of 1,669 counties in China in 2020, we reveal the spatial pattern of URI and find a high correlation between the spatial pattern of URI and the relief degree of land surface (RDLS). Using structural equation modeling, we discover that topography has direct ( − 0.18, p < 0.001) and indirect ( − 0.17, p < 0.001) effects on URI. The indirect negative effects are mediated through the infrastructure, and the combination of localized advantages and modern technical conditions could mitigate the negative impact of topography. Finally, we identify 742 counties as lagging regions in URI, which can be clustered into eight types. Our findings could facilitate policy designing for those countries striving for integrated and sustainable development of urban and rural areas.

Evolution Rules of Urban-rural Development and Inspiration for China's Agriculture

Based on urban-rural contrast coefficient,this article designs the agriculture relative development index(ARDI) as indicators measuring the intensity of urban-rural dual structure which is comparable among the countries of the world.This article calculates ARDI of 40 countries from 1980 to 2004.The result shows that ARDI in the developed countries and most of the middle-income countries are rising and yet there are declines in most of the low-income countries.The result also showed that most countries' ARDI will see a decline at the earlier stage of industrialization,so their dual economic structure will also aggravate and urban-rural gap will widen.With the economic development,the tendency will change and ARDI presents a U-shape change overall.The turning point is when a country becomes a middle-income one.

From Shanghai empty-nesters problem of looking of urban and rural dual structure

With the continuous development of political, economic,social, empty nesters and more problems, it is not a simple personal issues, has become urgent to break the social proposition.This paper intr~,duces the concepts at the same time,Further analysis of the current situation empty-nesters of the problem and sort out the history of urban-rural dual structure,Finally, find information put forward some countermeasures and suggestions.

The Effects of Financial Structure on Urban-Rural Income Gap Viewed through Economic Growth and Urbanization

From the perspective of economic growth and urbanization,this paper proposes several hypotheses on how financial structure affects urban-rural income gap combining with the stylized facts of Chinese economy,and then uses a panel data of 29 provinces over 1996-2015 to conduct empirical analysis.Theoretical analysis shows that owing to the distinct availability of urban and rural residents for financial services,financial structure has a distinct impact on their income disparity.Meanwhile,through the function of credit allocation,financial structure plays important roles in the processes of economic growth and urbanization,and then has indirect effects.The results indicate that increasing the ratio of direct financing has a direct impact on shrinking the urban-rural income gap,and has an indirect impact through economic growth and urbanization.More importantly,the intermediary effect of urbanization is stronger than that of economic growth.Therefore,releasing the controls on financial markets helps shrink the urban-rural income gap in China.

“二元社会结构”视域下农业特色产业发展路径的分析——以云南花卉产业的发展为例

发展特色农业是我国农业结构战略调整的要求,是提高我国农业国际竞争力的要求,是增加农民收入的迫切需要。云南花卉产业就是发展农业特色产业的一个成功实例,从1983年斗南收获的第一枝剑兰到现在成为全球三大花卉主产区之一,云南花卉产业的发展一直是相关学者热烈讨论的内容。利用“二元社会结构”理论,以云南花卉的产业发展为对象,分析政府力量代表的“伞式社会”和民间力量代表的“蜂窝式社会”在产业发展的各个阶段所发挥的作用。认为在花卉产业形成之初,民间自发性的探索力量以“蜂窝式”扩张,为产业发展奠定了规模基础;随着产业发展,政府力量入场,自上而下提供资源扶持产业发展,激发了产业发展潜力,与民间力量相互补充;进入新发展阶段,政府的“伞式”支持更加多层面、多方位、多领域,与民间“网络式”开拓促进产业升级完善,共同推动云南花卉产业可持续发展。

企业的量子态与人本企业制度安排

企业及其员工具有类量子特性。面对量子态企业,管理需要量子化革命。人本化的企业制度安排是实现量子管理的有效途径,可从产权与治理制度、组织制度和管理制度三个层面入手实现企业管理量子化。二元产权制度、“八爪鱼式”组织架构模式和自驱动的管理制度体系是人本制度安排的思想内核。人本制度安排有助于企业更好地应对外部不确定性,充分发挥人的创造力,提升人创造价值的主动性,充分释放人的内在潜能,最终实现共有经济价值最大化和成就人、发展人的价值管理目标。

土岩组合地层变截面嵌套桩施工技术及应用

在城市地铁建设中,常常会遇到土岩组合基坑,目前,大多数施工方法采用施工吊脚桩。为解决吊脚桩施工时存在多余占地及步骤烦琐等问题,论文提出了一种新形式的变截面套桩,并详细介绍了其施工方式及支护体系,并在实际工程中应用。现场监测数据表明,整体位移量较小,基坑稳定性良好,简化了施工工序,节省了施工成本。

韩江流域复合式民居平面布局的二元结构——兼论华南民居平面类型的层级化认知

文章选取明清时期韩江流域为研究区域,将复合式民居平面布局二分为核心、附属两部分,以核心建筑单体平面类型和主从组合方式为两大线性谱系,建立二元结构的分析框架以解释类型变化。其中,核心建筑单体平面可提取出长屋式、植入式、五开间、三开间四种代表类型,而组合方式根据轴型不同可分为单弱轴、单强轴、多轴三种类型,进而基于二者总结出八种关联模式。通过对不同平面类型、不同关联模式的案例地理分布进行分析,论证了五开间堂横式大屋为均布韩江流域的普遍类型,不同关联模式可以解释为不同家族制度所采取的迥异平面布局策略的产物。而仪式空间、居住空间的二元结构组合分析方法可以拓展至更大的地域范围,帮助建立层级化民居平面类型认知框架。

土岩组合地层旋喷桩止水桩锚支护基坑变形与受力数值分析

利用基于有限元原理的设计计算软件Plaxis对青岛三星数码大厦基坑工程进行数值模拟计算,其地表水平位移的计算结果与实测数值吻合较好。并通过对模拟得到的基坑与支护结构的变形结果如基坑总位移、灌注桩水平位移和基坑周边地表沉降以及支护结构的内力分布情况如灌注桩剪力、轴力、弯矩和锚杆内力进行分析发现预应力锚杆能够明显地改变土体中的应力分布,对基坑变形有很好的约束作用。说明在土岩二元结构地层条件下,支护结构的变形主要产生于岩面以上,采用桩锚支护结构是可行的,用Plaxis进行基坑模拟可以用来作为深基坑设计、施工的辅助工具。

天津站抽水试验分析

根据地质勘察报告,对天津站交通枢纽工程现场地下各含水层进行了大型抽水试验,以确定含水层类型和水文地质参数值,为基坑开挖和降水工程提供设计依据与研究基础。对抽水试验结果,应用经典井流理论拟合观测孔内水位降深,判明第一承压含水层属于Theis无越流补给型,第二承压含水层属于Huantush越流补给型,并得到了相应的水文地质参数值。由抽水试验分析结果判明天津站区域内潜水层——第一承压含水层不属于二元结构,初步掌握了弱透水层越流量占含水层释水量的相对比例与各含水层之间的水力联系状况。第三、四承压含水层水头低、埋藏深,属于天津第Ⅱ含水组深层地下水,对挖深30m以内基坑基本无影响。

二元结构岩土基坑“吊脚桩”支护设计数值分析

在山地丘陵地区,上层是土体、下层是岩体的岩土二元结构基坑非常普遍。针对此类基坑支护中常用到的"吊脚桩"的设计和施工特点进行有限元数值模拟与分析,研究了其设计方法及其安全稳定性、桩体嵌岩深度、桩脚处锚杆轴力和预留岩肩宽度等各种影响因素。分析结果表明:此类基坑设计对上层土体按传统设计计算方法进行设计施工时能够保证上层土体开挖基坑的稳定性;增加嵌岩深度或增大桩脚处锚杆预应力都能有效地控制下层岩体开挖时基坑的稳定和变形,锚杆预应力为主要控制因素,施工中要注意对其轴力进行监测;预留岩肩宽度越大,支护桩位移越小,当该宽度大于某定值时,其变化对位移和弯矩的影响作用将不再明显。

加锚双排桩与“吊脚桩”基坑支护结构数值分析

加锚双排桩与"吊脚桩"是两种特殊的基坑支护结构,在设计与施工中的经验较少,因此,在此类基坑支护方案的设计与施工中,对其进行变形及安全稳定性分析极其重要。采用平面应变有限元法结合实际工程分析了两种基坑支护结构的变形及稳定特性。对双排桩,选择排距和桩体刚度两个主要的影响因素进行分析,提出了合理的排距与刚度大小;对"吊脚桩"则选择不同预留岩肩宽度与桩体嵌岩深度进行模拟分析,讨论桩体位移和弯矩的变化规律,从而提出合理的设计参数;并利用强度折减法分析了两种结构的安全性,从而为设计和施工提供参考依据。

河北省小城镇发展中的问题和对策

本文分析了河北省小城镇发展中存在的诸多制约因素 :阐述了城乡一体化 ,破除二元结构 ,构建有利于小城镇发展的社会环境的构想 ,并提出了关于改革城乡居民户籍管理制度。

山东省城乡经济差距现状与协调发展对策

为了促进山东省城乡经济协调发展,探索城乡经济发展出现差距的原因。从城乡居民收入、财产状况和生活水平3方面介绍了其发展差距,从城乡区位条件、城镇化水平和农业产值比重及农业劳动生产率等方面分析了影响山东省城乡经济发展的主要原因。提出了应深化制度改革,打破城乡二元经济格局;优化农村产业结构,大力发展现代农业;推进农村城镇化进程,加快社会主义新农村建设的城乡协调发展对策。

元坝长兴组超深层生物礁大气田优质储层发育机理

通过系统开展元坝气田长兴组超深层生物礁储层岩石学与岩石地球化学分析,结合碳酸盐岩溶蚀动力学模拟实验,以及储层古压力恢复,揭示了元坝超深层生物礁优质储层的发育保存机理。研究表明,早期暴露溶蚀、浅埋藏白云岩化是基质孔隙发育的基础,储层深埋引起的古油藏原油裂解导致的超压水力破裂缝的形成,是储层渗透性改善的关键,"孔-缝耦合"共同控制了超深层优质储层的发育。在此基础上,构建了生物礁非均质"孔-缝双元结构"储层模型,为生物礁储层预测奠定了理论基础。