对西康铁路软岩和极软岩隧道支护的认识     

郑伟 《水文地质工程地质》2001,28(4):40-42

西康铁路沿线软质岩带在秦岭以南分布较广。在软质岩带集中出露的地段，地质情况复杂。隧道围岩稳定性差，其工程地质特性随着岩层矿物成分、产状、风化程度、地下水赋存特征的不同有很大差异。本文介绍了西康铁路南段软岩和极软岩带的设计指导思想，并结合西康线具体情况，具体分析了软岩极软岩对隧道施工的影响，对该类型地层铁路隧道的设计、施工，提出几点建议，作为今后工作的借鉴。  相似文献   

A displacement‐based seismic design procedure for RC buildings and comparison with EC8     

T. B. Panagiotakos  M. N. Fardis 《地震工程与结构动力学》2001,30(10):1439-1462

A procedure for displacement‐based seismic design (DBD) of reinforced concrete buildings is described and applied to a 4‐storey test structure. The essential elements of the design procedure are: (a) proportioning of members for gravity loads; (b) estimation of peak inelastic member deformation demands in the so‐designed structure due to the design (‘life‐safety’) earthquake; (c) revision of reinforcement and final detailing of members to meet these inelastic deformation demands; (d) capacity design of members and joints in shear. Additional but non‐essential steps between (a) and (b) are: (i) proportioning of members for the ULS against lateral loads, such as wind or a serviceability (‘immediate occupancy’) earthquake; and (ii) capacity design of columns in flexure at joints. Inelastic deformation demands in step (b) are estimated from an elastic analysis using secant‐to‐yield member stiffnesses. Empirical expressions for the deformation capacity of RC elements are used for the final proportioning of elements to meet the inelastic deformation demands. The procedure is applied to one side of a 4‐storey test structure that includes a coupled wall and a two‐bay frame. The other side is designed and detailed according to Eurocode 8. Major differences result in the reinforcement of the two sides, with significant savings on the DBD‐side. Pre‐test calculations show no major difference in the seismic performance of the two sides of the test structure. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

核磁测井数据弛豫谱反演软件研究     

翁爱华  李舟波  王雪秋 《吉林大学学报(地球科学版)》2001,31(4):395-397,403

简单介绍了核磁测井数据弛豫谱反演方法原理 ,用混合编程方法和动态连接库技术 ,将用FORTRAN语言编写的核心处理模块转换为动态连接库 ,并在C++语言中动态调用。应用快速应用程序开发工具完成了图形用户界面的核磁测井数据处理软件设计。  相似文献   

抗浮锚杆的应用实例   总被引：4，自引：0，他引：4  

王贤能  叶蓉  郑建昌  王勇强 《地质灾害与环境保护》2001,12(1):68-71

抗浮锚杆是一种竖向锚固技术，由于该方法具有造价低，工期短，施工便捷等优点，在抗浮锚固工程中的应用越来越广，本文以两个成功应用实例介绍了抗浮锚杆的设计和施工经验，并探讨了存在的主要问题，以期对同类工程具有参考价值。  相似文献   

滑坡灾害防治工程中施工组织设计对工程投资概算影响的研究   总被引：1，自引：0，他引：1  

屈晓红  邹艳琴  门玉明  彭建兵 《工程地质学报》2001,9(1):51-56

本文通过对具体地质灾害防治工程初步设计阶段的施工组织设计与工程投资概算之间关系分析, 指出施工组织对工程投资概算的影响不小于工程设计和地质勘查资料的影响, 施工组织设计对概算可靠度的提高有很重要的意义。  相似文献   

Wavenumber response of Shanghai Seismic array     

TONG Yu-xia  ZHU Yuan-qing 《地震学报(英文版)》2001,14(1):101-106

Seismic array can be traced back to 1950s when it mainly aimed at detecting and distinguishing the signals of nuclear explosion and seismic signals. The research on seismic array includes seismic array techniques and applications of array in geophysics. Array techniques involve array design and data processing methods (Anne, 1990). Nowadays, the continuous development of seismic array￠s theory could relate to many scientific issues in geophysical field (Tormod, 1989; Mykkeltveit, Bungum, 1984). Seismic array is mainly applied to detect weak events. The response characteristic of array is an important indication of array￠s detection ability. Therefore, when we study an array or construct an array, one of the neces-sary works is to calculate the response characteristics of the array (Harjes, 1990). The aperture and layout of array are two dominating geometrical features. The typical aperture of interna-tional array is generally from several to tens kilometers. For instance, arrays with aperture of dozens kilometers aperture are KSA, WRA, YKA, etc, while arrays with several kilometer aperture are ARC, FIN, GEE, etc. Moreo-ver, in the view of array￠s layout, NOR, GER, etc have circle layout, while WRA, YKA, etc have decussating layout. This paper mainly discusses the relation between deployment of array and wavenumber response. With the example of constructing Shanghai Seismic Array, this paper provides one practical solution to search the proper array deployment. In this paper, the simple delay beam technique is adopted to calculate the response characteris-tics of array. Certainly, the different processing methods have different result, but the result from the simple delay beam processing could be enough to reflect the feature of an array.  相似文献   

An earthquake data acquisition system for mobile observation     

Teng Yun-tian  Zhang Lian  Zhou He-ming  Wang Yan  Liu Xiao-qin 《地震学报(英文版)》2001,14(5):596-599

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地震灾害快速评估的计算机方法和程序   总被引：4，自引：0，他引：4  

姜立新  李闽峰 《地震》1995,(3):228-233

文中介绍一种在微机上实现的地震灾害快速评估应用软件：ＤＩＳＥＶ，ＤＩＳＥＶ由地震输入系统，图形显示系统，灾害评估系统和数据输出系统等４部分组成，采用确定性的地震灾害评估方法，用Ｃ语言设计完成，ＤＩＳＥＶ操作简单，快速，对震后快速反应工作以及救灾工作有重要意义。  相似文献   

Discussion　on　uncertainties，attenuation　of　ground　motion　and　aseismic　design　criterion     

张天中  马云生  舒曦 《地震学报(英文版)》1995,8(4):629-637

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The channel-geometry method: Guidelines and applications     

Geraldene Wharton 《地球表面变化过程与地形》1995,20(7):649-660

All river engineering schemes require flood discharge estimates as part of the design and appraisal process. Unfortunately, continuous measurement of flood discharges is limited to those river sites with instrumented gauging stations, which constitute only a small proportion of channel reaches where information is required. Therefore, considerable research effort has been devoted to the development of reliable indirect techniques of flood discharge estimation. Research on the interrelationship of stream channel geometry and river discharge has provided the basis for an indirect method of flood estimation – the channel-geometry method – which employs river channel dimensions alone to estimate discharge characteristics at ungauged river sites. Channel-geometry equations are developed empirically by relating streamflow data from gauging stations and channel dimensions measured from natural river reaches in the vicinity of the gauge, and take the form of power function relations. Once regional channel-geometry equations have been defined, a channel width or channel capacity measurement is the only variable needed to estimate the flood flow characteristics at a specified river site. The method is useful as an alternative to traditional catchment-based approaches or as a rapid reconnaissance technique. In addition to the application for flood discharge prediction, channel-geometry equations could prove helpful in the management of river channels, first, by providing a basis for assessing local deviations in the channel form–discharge relation, deviations which could be employed as indicators of the sensitivity of particular stretches of river channel to change, and secondly, in the computation of natural channel dimensions for use in river channel design and river restoration.  相似文献