塑料排水板处理的软土地基的分析

首先介绍了塑料排水板(PVD)加固的软土地基固结沉降计算的分析方法.该方法中提出了塑料排水板加固地基的等效竖向渗透系数的概念与计算方法.并介绍了影响分析结果的四个参数的选取方法.通过一个工程实例介绍了路堤荷载下PVD加固地基的有限元二维分析方法.结果表明所提方法可以较好地模拟实测数据.     

剪切对非饱和土土-水特征曲线影响的探讨

用净平均应力和吸力等于常数、偏应力增大的三轴排水剪切试验，探讨了剪切对非饱和土水量变化的影响。试验结果表明，土-水特征曲线依赖于偏应力，改进了非饱和土中水量变化的本构关系，建立了含水量．吸力．净平均应力．偏应力形式的土．水特征曲线。     

垂直岩脉的大地电磁响应研究

对垂直岩脉的大地电磁响应进行解析推导,给出了TM极化和TE极化下高阻基底与低阻基底的垂直岩脉视电阻率解析公式,并通过对计算结果的分析,概括出垂直岩脉的大地电磁响应之视电阻率曲线特征。     

某双曲线冷却塔施工放线测量

结合某双曲线冷却塔施工测量工作，介绍了在测量新技术条件下复杂建筑的施工测量方法和技术。     

Deblurring Texture Extraction from Digital Aerial Image by Reforming “Steep Edge” Curve

Texture extract from digital aerial image is widely used in three-dimensional city modeling to generate “photo-realistic” views. In this paper, a method based on reforming “Steep edge” curve, which clearly explains how the diffraction of the sunlight makes digital aerial image blurring, is proposed to deblur the texture extraction from digital aerial image, and the experiment shows a good result in visualization and automation.     

考虑应力状态的裂隙岩体渗透系数确定方法简述

系统总结了近四十年来国内外不同学者计算裂隙岩体渗透系数的经验公式,介绍了确定渗透系数的试验方法,讨论了影响渗透系数的若干因数.     

地震计性能测试装置的研制

研制一个地震计性能测试装置，使其在地震计的生产过程中提供仪器的频响特性曲线及三分量一致性，提供更方便可靠的测试手段。结合目前现有的电法标定原理以及数据处理理论，给出测试装置的原理、硬件电路、软件设计以及结果分析。     

Contrasting flow pathways within tropical forest slopes of Ultisol soils

There are very few experimental studies identifying hydrological pathways within rain forest slopes. Such knowledge is, however, necessary to understand why forest disturbance affects rainfall–riverflow response and nutrient migration. This study examines flow pathways within lowland rain forest slopes comprising Udults of the Ultisol soil order. Experimentation was conducted on four SE Asian hillslope units (each 5 × 5 m in plan) in the Bukit Timah catchment (Singapore Island), and in the W8S5 catchment (Sabah, Borneo Island). The flow pathways were identified by artificial tracer experiments. We evaluated how well hydrometric calculations based on tensiometry and permeametry measurements predicted the tracer patterns. The tracer work indicated much faster subsurface flows at Bukit Timah than W8S5 for the storms studied. Some explanation of the greater subsurface waterflows at Bukit Timah in comparison to W8S5 is afforded by the less steep moisture release curves which maintain hydraulic conductivity as the soil dries. Vertical flow of the tracer through the upper 1 m of soil predominated (>90 per cent of percolation) in the Bukit Timah slopes. In some contrast, a major component (approximately 60 per cent) of the tracer percolation was directed laterally within the W8S5 slopes. The flow vectors calculated using the hydrometric methods did, however, grossly under‐estimate the degree of lateral deflection of waterflow generated at W8S5 and to a lesser extent over‐estimated it at Bukit Timah. In part, these errors may relate to the inability of traditional hydrometric techniques to fully characterize the effect of the large and small ‘natural soil pipes’ present within both catchments. In conclusion, the study indicates that marked variations in flow vectors exist within the Udult great group of SE Asian soils and hydrometric calculations may be poor predictors of these dominant pathways. Copyright © 2005 John Wiley & Sons, Ltd.     

垃圾土的渗透特性试验

用取自京郊某垃圾堆填场的垃圾土样进行渗透试验,比较不同密度情况下渗透系数的差别。试验中同时记录了渗透系数随时间的变化情况。试验结果表明,垃圾土的渗透系数随密度的不同,可以在(10-3~10-7)cm/s之间变动。试验中也发现垃圾土的渗透系数随时间而逐渐减小,大约6天左右趋于稳定。对垃圾土的渗透系数室内试验测定应以观测7天时间为宜。     

Load testing of anchors for wire mesh and cable net rockfall slope protection systems

This study presents results of field tests conducted on anchors used to support wire mesh and cable net rockfall protection systems. The load transfer and failure characteristics of these anchors are different from those used in most civil applications in that loads are often applied transversely to the top of tendon rather than axially. The study included vertical as well as horizontal series of tests conducted on some anchors widely used in wire mesh and cable net rockfall protect systems. It was found that the deformation characteristics of these anchors under vertical loading are nonlinear. They are approximated by a hyperbolic formulation and used to calculate the ultimate capacity. Top-downward progressive cracking of the grout was observed during loading and influences the deformation characteristics of these anchors under horizontal loading. The anchors deflected excessively before they could attain their ultimate capacity in the horizontal direction. Based on the field tests, it appears that the deformation under horizontal loading in the systems can be limited by using an enlarged grout zone at the top.