刚性下卧层对上部土层变形的影响

通过自编二维面向对象有限元程序计算,对土岩组合地基中刚性下卧层埋藏深浅及刚度大小对上部土层变形的影响规律进行了分析,得出了一些结论,可为相关工程应用提供适当的参考。     

福建西乾金铜矿床地质特征、成因及找矿方向

西乾金铜矿床属隐爆角砾岩型,成矿温度为132～318℃,主矿体受隐爆角砾岩筒控制,含矿围岩蚀变及矿体垂向变化上具有明显的规律.成矿物质主要来源于英安斑岩和马面山群变质岩系.矿体的形成主要由燕山晚期的英安斑岩经过岩浆侵入,活化萃取变质岩中含矿物质,并携带迁移至地壳浅部,发生隐爆,经降温减压在岩筒接触带形成矿体.     

传递矩阵法分析中心集中荷载下圆形刚性板

采用传递矩阵法分析横观各向同性地基上的刚性圆板，分析竖向的弹性模量Ev、水平向的弹性模量Eh、竖直面上的剪切模量Gv以及Eh和Ev的比值n、Gv和Ev的比值m、水平向应力引起的正交水平向应变的泊松比Uh、竖直向应力引起的水平向应变的泊松比Uvh对沉降和基底反力影响；同时采用成层地基进行分析，将其计算结果与常规方法中采用对弹性模量和泊松在计算深度内按深度加权平均的计算结果进行比较。     

同心式射流泵在深层井点降水中的应用

本文比较了几种深层干扰降水的特点，就国内深层降水设备存在的问题，有针对地研制了同心式射流泵井点降水系统，该系统利用喷射泵真空和排出口压力提升地下水，其降水深度大，集水效果好，出水量稳定，速度较快，设备结构简单可靠，解决了深大基坑砂、粘土地层中干扰降水的问题。     

基础动力刚度的精确数值解及集中参数模型

土－结构相互作用分析的关键是建立以土－结构界面定义的无限半空间的动力刚度矩阵。本文介绍了一种求解半无限地基动力刚度的新方法，通过两个算例验证了该方法的精度，并给出了一种利用频域刚性基础动力刚度计算基础时域荷载响应的实用方法，该研究为刚性基础设计提供了一种新的，可靠的理论方法。     

鲁西归来庄金矿成因

通过归来庄金矿床隐爆角砾岩体的特征分析，认为归来庄隐爆角砾岩体不是隐爆－侵入角砾岩，而是原地爆破生成的正常隐爆构造。结合归来庄金矿的矿床特征，太化蚀变特征及其流体包裹体特征认为，归来庄金矿为一普通的隐爆角砾岩型金矿床，岩浆期后热液形成隐爆角砾岩体的同时形成了金矿。在其爆破与成矿过程中，流体经历着“升温→爆破（沸腾）→降温→升温→爆破（沸腾）→降温”这样一个多次循环的演化过程。     

刚架护坡桩边坡支护技术

介绍了刚架护坡桩的概念、特性、实用计算方法、刚架护坡桩的施工和工程应用情况，并就刚架护坡桩与双排桩护坡的本质区别作了分析，供从事岩土工程设计、施工的人员参考。     

Dynamic analysis of stacked rigid blocks

The dynamic behavior of a structural model of two stacked rigid blocks subjected to ground excitation is examined. Assuming no sliding, the rocking response of the system standing free on a rigid foundation is investigated. The derivation of the equations of motion accounts for the consecutive transition from one pattern of motion to another, each being governed by a set of highly nonlinear differential equations. The system behavior is described in terms of four possible patterns of response and impact between either the two blocks or the base block and the ground. The equations governing the rocking response of the system to horizontal and vertical ground accelerations are derived for each pattern, and an impact model is developed by conservation of angular momentum considerations. Numerical results are obtained by developing an ad hoc computational scheme that is capable of determining the response of the system under an arbitrary base excitation. This feature is demonstrated by using accelerograms from the Northridge, CA, 1994, earthquake. It is hoped that the two-blocks model used herein can facilitate the development of more sophisticated multi-block structural models.     

Seismic isolation of rigid cylindrical tanks using friction pendulum bearings

Storage tanks are vulnerable to earthquakes, as numerous major earthquakes have demonstrated. The trend of recent revisions to make seismic design criteria for large‐scale industrial storage tanks increasingly stringent has made development of cost‐effective earthquake‐resistant design and retrofit techniques for industrial tanks imperative. This study assesses the feasibility of seismic base isolation for making liquid‐filled storage tanks earthquake resistant. The sliding‐type friction pendulum seismic (FPS) bearings are considered rather than the elastomeric bearings because the dynamic characteristics of an FPS‐isolated tank remain unchanged regardless of the storage level. This work has devised a hybrid structural‐hydrodynamic model and solution algorithm, which would permit simple, accurate and efficient assessment of the seismic response of rigid cylindrical storage tanks in the context of seismic isolation. Extensive numerical simulations confirm the effectiveness of seismic base isolation of rigid cylindrical tanks using FPS bearings. Copyright © 2001 John Wiley & Sons, Ltd.     

确定地下管线深度的方法原理研究

从理论上阐述了利用倾斜磁场最大值点、利用垂直磁场分量峰值点和利用水平磁场分量半极值点确定地下管线深度的原理方法,指出了利用倾斜磁场最大值点确定管线深度时在原理上存在的问题和不实用性,同时从原理上和实用中筛选出了最佳的定深方法-水平磁场分量三角法.