基于主体功能区划的上海市国土空间结构研究

构建由资源环境承载力子系统、现有开发密度子系统、发展潜力子系统3个子系统组成的上海市主体功能区指标体系。运用2012年数据计算各指标体系的综合得分,并制作Moran散点图。同时,依据资源环境承载力、现有开发密度与发展潜力这3个因素的综合评分以及Moran散点图的象限把上海市各区县划分成六大功能亚类:核心功能提升亚区、核心功能优化亚区、战略发展亚区、都市发展亚区、城市拓展亚区与生态涵养亚区。最后,剖析这六大功能亚区与国家层面上的优化开发区、重点开发区与限制开发区之间的内在联系。     

多分支承力盘桩的特性分析

从理论和实践说明多分支承力盘桩是一种经济效益好，承载力高的新型桩基。     

Evaluation of the seismic performance of a three‐story ordinary moment‐resisting concrete frame

This study focuses on the seismic performance of Ordinary Moment‐Resisting Concrete Frames (OMRCF) designed only for gravity loads. For this purpose, a 3‐story OMRCF was designed in compliance with the minimum design requirements in the American Concrete Institute Building Code ACI 318 (1999). This model frame was a regular structure with flexure‐dominated response. A 1/3‐scale 3‐story model was constructed and tested under quasi‐static reversed cyclic lateral loading. The overall behavior of the OMRCF was quite stable without abrupt strength degradation. The measured base shear strength was larger than the design base shear force for seismic zones 1, 2A and 2B calculated using UBC 1997. Moreover, this study used the capacity spectrum method to evaluate the seismic performance of the frame. The capacity curve was obtained from the experimental results for the specimen and the demand curve was established using the earthquake ground motions recorded at various stations with different soil conditions. Evaluation of the test results shows that the 3‐story OMRCF can resist design seismic loads of zones 1, 2A, 2B, 3 and 4 with soil types S_A and S_B . For soil type S_C , the specimen was satisfactory in seismic zones 1, 2A, 2B and 3. For soil type S_D , the OMRCF was only satisfactory for seismic zones 1 and 2A. Copyright © 2004 John Wiley & Sons, Ltd.     

扩散型海洋倾倒区容量估算方法初探——以嵊泗上川山疏浚物海洋倾倒区为例

以嵊泗上川山疏浚物海洋倾倒区为例,探讨扩散型海洋倾倒区容量.通过生态敏感目标水质保护要求来确定倾倒活动最大倾倒强度;以最大倾倒强度及倾倒区本身和周边海域港航功能正常发挥为前提,确定水深可淤积厚度,以此为基础,分析系列倾倒量下的区域淤积影响程度,最终确定可接受情况下的倾倒量,从而估算倾倒容量.倾倒活动产生的悬浮物影响对生态敏感目标影响分析,倾倒活动瞬时最大可接受倾倒强度至少为36 000 m3(基于实际工况);在7个月倾倒期内,设定1 500×104、4 000×104、6 000×104m3系列倾倒量,分析倾倒区本身及周边水深敏感目标的淤积程度,最终确定在1 500×104m3倾倒量下,淤积程度可接受,初步估算该倾倒区的容量为1 500×104~2 000×104m3.     

Measured and calculated spudcan penetration profiles for case histories in sand-over-clay

This paper reports five case histories of jack-up rig installation in layered soil profiles where a dominate feature was a stronger sand layer overlaying a weaker clay layer. In all cases a relatively continuous load-penetration profile was measured during installation of each of the three spudcan foundations. Summary site-investigation data is provided and consisted of mainly torvane, minature vane, unconsolidated undrained triaxial and pocket penetrometer tests for determining undrained shear strength of the clays and blow counts for deriving the relative density of sand. A statistical averaging method recommended in the InSafeJIP guidelines was used to provide the best fit of the undrained shear strength profile in the clay as this then allowed for spudcan load-penetration profiles to be estimated without introduction of user interpretation or bias. Sand properties were taken as provided in the original site-investigation report. Comparisons between load-penetration profiles calculated using the industry-standard ISO guideline, more recently proposed mechanism-based calculation method and three-dimensional large deformation finite element simulations are made with the measured data, leading to valuable insights for practitioners for estimating behaviour of jack-up installations in problematic sand-over-clay soil profiles.     

通辽市水资源承载能力的多层次多指标可变模糊评价研究

基于水资源承载能力概念和通辽市水资源利用基本情况,构建了水资源可承载能力评价的递阶层次指标体系.结合可变模糊集理论,建立了通辽市多层次水资源承载能力可变模糊评价模型,并对通辽市各行政区现状年和规划年的水资源承载能力进行评价.结果表明,通辽市水资源承载能力全区均较弱,产业结构不合理和水资源重复利用率低是造成水资源承载能力低的主要因素.对2020规划年的评价结果显示,节水条件下通辽市水资源承载能力有所改善,但基本仍较弱,需通过合理调整产业结构、提高水资源利用率等来提高水资源承载能力.     

桩土相互作用及单桩承载力确定模拟研究

以灌注桩桩土相互作用的原位试验为基础．结合东营地区具体土层结构、性质特点．采用有限单元法对软土地区的砼灌注桩桩土相互作用进行仿真模拟．研究桩土相互作用、荷载的传递规律、桩土相对位移与桩侧摩阻力的关系．通过桩载试验资料对比．得出三维有限元法的模拟结果与实测值相近。在此基础上．根据侧摩阻力最大值发挥不同步这一特点和桩土相互作用的实质及荷载传递规律．提出一种新的单桩圾限承载力计算公式。     

CFG桩复合地基承载力可靠度分析

利用可靠度理论对从国内收集到的25组CFG桩复合地基承载力试验数据进行了概率统计处理。借助无量纲计算模式,计算不同载荷组合下CFG桩复合地基承载力的可靠度指标,并分析了各随机变量对可靠度指标的影响程度。为评价常 用经验公式 的可靠性提供一定的参考。     

土层抗浮锚杆承载力关键影响因素现场试验研究

工程实践及理论研究均表明,锚土界面特性和锚杆的几何形状是影响抗浮锚杆承载力的2个关键因素。采用不同的施工工艺进行现场试验施工,得到了具有不同锚土界面特性和锚杆几何形状的抗浮锚杆。通过现场锚杆抗拔试验得到锚杆的应力应变关系及极限抗拔承载力。研究结果表明,改善锚土界面特性和采用变截面的锚固体可显著提高锚杆的抗拔承载力。同时,提出了1种经济高效的抗浮锚杆施工工法。     

Antimony in hydrothermal processes: solubility, conditions of transfer, and metal-bearing capacity of solutions

Based on data on the composition of ore-bearing hydrothermal solutions and parameters of ore-forming processes at various antimony and antimony-bearing deposits, which were obtained in studies of fluid inclusions in ore minerals, we investigated the behavior of Sb(III) in the system Sb–Cl–H₂S–H₂O describing the formation of these deposits.

We also performed thermodynamic modeling of native-antimony and stibnite dissolution in sulfide (m_HS⁻ = 0.0001−0.1) and chloride (m_Cl⁻ = 0.1−5) solutions and the joint dissolution of Sb_(s)⁰ and Sb₂S_3(s) in sulfide-chloride solution (m_HS⁻ = 0.01; m_Cl⁻ = 1) depending on Eh, pH, and temperature. All thermodynamic calculations were carried out using the Chiller computer program. Under the above conditions, stibnite precipitates in acid, weakly acid to neutral, and medium redox solutions, whereas native antimony precipitates before stibnite under more reducing conditions in neutral to alkaline solutions.

The metal-bearing capacity of hydrothermal solutions (200–250 °C) of different compositions and origins has been predicted. We have established that the highest capacity is specific for acid (pH = 2–3) high-chloride solutions poor in sulfide sulfur and alkaline (pH = 7–8) low-chloride low-sulfide solutions.