A double structure generalized plasticity model for expansive materials

The constitutive model presented in this work is built on a conceptual approach for unsaturated expansive soils in which the fundamental characteristic is the explicit consideration of two pore levels. The distinction between the macro‐ and microstructure provides the opportunity to take into account the dominant phenomena that affect the behaviour of each structural level and the main interactions between them. The microstructure is associated with the active clay minerals, while the macrostructure accounts for the larger‐scale structure of the material. The model has been formulated considering concepts of classical and generalized plasticity theories. The generalized stress–strain rate equations are derived within a framework of multidissipative materials, which provides a consistent and formal approach when there are several sources of energy dissipation. The model is formulated in the space of stresses, suction and temperature; and has been implemented in a finite element code. The approach has been applied to explaining and reproducing the behaviour of expansive soils in a variety of problems for which experimental data are available. Three application cases are presented in this paper. Of particular interest is the modelling of an accidental overheating, that took place in a large‐scale heating test. This test allows the capabilities of the model to be checked when a complex thermo‐hydro‐mechanical (THM) path is followed. Copyright © 2005 John Wiley & Sons, Ltd.     

一种面向DVGE的移动Agent计算模型

讨论了移动Agent技术的特点及其在分布式虚拟地理环境（distributed virtual geographic environment，DVGE）中的应用优势，设计了混合式Agent控制结构，提出了一种移动Agent计算模型，并就移动Agent开发平台选择、动态路由控制策略、用户和共享资源管理等与原型系统实现相关的一些关键问题进行了讨论。     

Micropile technique to control upward movement of lightweight structures over expansive soils

A simplified analytical formulation is presented for the mechanism by which micropiles surrounded by compacted sand control the upward movement of lightweight buildings over expansive soils. This formulation identifies the significant variables influencing the performance of micropile reinforcement. A design methodology for micropile reinforcement utilizing the resulting formulation is proposed and illustrated by a hypothetical example. This revised version was published online in July 2006 with corrections to the Cover Date.     

无机抗菌材料及应用

无机抗菌材料是一种新近研制并开始获得应用的功能材料。简要介绍银系抗菌剂和氧化钛光触媒系抗菌剂的性质和抗菌机理、方法，并介绍应用这些无机抗菌剂制得的抗菌布料、抗菌塑料、抗菌卫生陶瓷和抗菌活性炭等各种抗菌产品。     

膨胀土干湿循环胀缩裂隙演化的CT试验研究

对南阳重塑膨胀土在干湿循环过程中裂隙的演化进行了CT试验研究，试样的CT图像显示了原有裂隙开展，新裂隙产生，裂缝数量增加并连通，最后形成裂隙网络的过程。定义了基于CT数据的裂隙损伤变量，分析了裂隙损伤变量随累计干缩体变的变化规律。     

民用燃煤烟尘特征及环境矿物材料固硫剂开发

通过对北京某地区居民炊事用型煤和散装烟煤煤岩和元素分析 ,表明烟煤和型煤含碳量分别为 70 %和 5 9% ,烟煤中可燃性高变质活性组分为 87% ,而型煤有较高的粘土成分 ,约达 2 0 %。对它们燃烧产生的烟尘进行物相分析、组分定量、粒度测试、显微形貌和微观结构等矿物学研究 ,表明型煤和烟煤的烟尘均含有较高碳质组分 ,分别占 2 5 %和 2 8% ;烟煤烟尘只有型煤烟尘含更高的烧蚀残渣 ,两者的粘土 (包括石英等矿物 )类组分均相当多 ,约占 5 0 % ;烟尘平均粒径都很小 ,型煤烟尘只有烟煤烟尘的 1/ 4左右 ,约为 6 5 μm ,而比表面积大 2倍多 ;烟煤烟尘呈碎屑状 ,型煤烟尘为粉末状 ;烟尘中均含有较多的均质体 ,并有铁质侵染现象 ;石英小颗粒在烟尘中大量存在。为促使燃煤充分燃烧 ,达到固硫、助燃和降尘的目的 ,本实验室开发研制了效果良好的民用燃煤环境矿物材料固硫添加剂 ,并对山东肥城高硫烟煤进行了型煤固硫实验 ,在 85 0℃ ,95 0℃和 10 5 0℃燃烧条件下固硫率高于目前国内同类水平 ,固硫率达 70 % 80 %。     

Geological and geotechnical aspects of Saudi Arabia

Summary This paper presents a brief review of the geological and geotechnical aspects of the Kingdom of Saudi Arabia. The first part of the paper presents a brief summary of the geological aspects and the soil characteristics in different parts of the country. The second part gives a brief outline of the major geotechnical problems encountered in the regions of the Kingdom along with their geographical locations.     

关于土与土体工程地质研究的新进展

作者在简要回顾近两年国内土及土体研究及会议的基础上,详细论述了本次大会在土与土体工程地质研究的进展,最后指出了5个有待加强研究的问题。     

安徽公路工程几种常见地质病害及其防治方法简介

本文以安徽省公路建设工程实例，介绍由膨胀土、软土、岩溶、崩塌滑坡引起的地质病害及其防治对策。     

DL－93堵漏剂的研制及应用

ＤＬ－９３堵漏剂是一种以石灰石粉为主体材料复配而成的灰白色纤维状粉末，经室内评价和现场应用，证明了具有酸溶率高、封堵效果好、施工方便等特点，还可通过酸化进行解堵，有减少储层受损之功效。