大视野背景扁平化商务课件.ppt

1、新浪微博努力hard微信公众号HardPPT演界网店铺HardPPTUNIT 10Rock Mass ClassificationClass 12-02 Group 1南阳哪里有治疗白癜风的医院郑州华柱白癜风医院是河南省新农合定点医疗机构,【微信号zzhznpx】咨询:0371-55833156,QQ：851856908采用专利口服（2012102561459）专利外用（2012102561660）治疗白癜风，新农合报销【70%-30%】，地址：郑州市西大街一号(二七广场东行100米路北)。南阳专业白癜风医院http:/ Words and Expressions 先 看 单 词 或 短 语R

2、efer to P92 Additionsrockboltsteel setscivil engineering RQD heading/faceNATMwire meshshot creteparameterstress fieldspanspallslabrock brustRMRblastbenchWhat Why How Who怎 么 阅 读For Example During the feasibility and preliminary design stages of a project,when very little detailed information on the r

3、ock mass and its stress and hydrologic characteristics is available,the use of a rock mass classification scheme can be of considerable benefit.At its simplest,this may involve using the classification scheme as a check-list to ensure that all relevant information has been considered.At the other en

4、d of the spectrum,one or more rock mass classification scheme can be used to build up a picture of the composition and characteristics of a rock mass to provide initial estimates of support requirements,and to provide estimates of strength and deformation properties of the rock mass.It is important

5、to understand that the use of a rock mass classification scheme does not(and can not)replace some of the more elaborate design procedures.However，the use of these design procedures requires access to relatively detailed information on in situ stress，rock mass properties and planned excavation sequen

6、ce，none of which may be available at an early stage in the project.As this information becomes available，the use of the rock mass classification schemes should be updated and used in conjunction with site specific analyses.Part OneEngineering Rock Mass Classification工 程 岩 体 分 类P88-89Engineering Rock

7、 Mass Classification工 程 岩 体 分 类Introductions读 前 介 绍Part TwoTerzaghis Rock Mass Classification太 沙 基 岩 体 分 类P89-90Terzaghi 我 是 太 沙 基太沙基 Karl Terzaghi18831963现代土力学奠基人 集教、研究、实践于一体 重视工程实践对土力学的发展 麻省理工 维也纳高等工业学院 伦敦帝国学院 哈佛大学 名誉博士学位9个 获ASCE最高奖诺曼奖4次(唯一)专设太沙基奖与太沙基讲座(最顶尖)Intact Rock完 整 岩Stratified Rock层 状 岩Mode

8、rately Jointed Rock中 度 节 理 岩Blocky and Seamy Rock块 状、有 裂 缝 岩Crushed butChemically Intact Rock碎 片 岩（未 受 化 学 扰 动）Squeezing Rock挤 压 岩Swelling Rock膨 胀 岩Descriptions 相 关 描 述Part ThreeClassifications Involving Stand-up Time隧 洞 自 稳 时 间 分 类P90Several Concepts 几 个 概 念Unsupported span 无支护跨度 1max(span of tunne

9、l,distance between the face and the nearest support)NATM 新奥法2New Austrian Tunneling MethodSeveral Arguments 几 个 观 点aThe standup time for an unsupported span is related to the quality of the rock mass in with the span is excavated.bAn increase in the span of the tunnel leads to a significant reductio

10、n in the time available for the installation of support.cNATM includes a number of techniques for safe tunneling in rock conditions in which the stand-up time is limited before failure occurs.dIn designing support for hard rock excavations it is prudent to assume that the stability of the rock mass

11、surrounding the excavation is not timedependent.Part FourRock Quality Designation Index(RQD)岩 石 质 量 指 标（R Q D 值）P90-91RQD什 么 是 R Q DPurpose目的 AQuantitative estimate 提供一种数值评价方法Definition定义BPercent of pieceslonger than 100mm大于100mm岩心长度百分比Measure方法CAt least NW sizedouble-tube core barrel标准尺寸(直径54.7mm)双

12、层岩心管Calculation计 算 方 法Length of core run:200 cmRQD=(38+17+20+35)/200 100%=55%For exampleLength of core run:200 cmRQD=(60+36+17+1)/200 100%=(6 4)%Try a try60+36+17+1564Calculation计 算 方 法Palmstroms relationship for clay-free rock masses（不 含 粘 性 土 的 岩 体）RQD=115 3.3JvJv for the sum of the number of join

13、ts per unit length for all jointChanged by the borehole orientationUse volumetric joint count to reduce this dependence.！Attention 注 意 事 项Deeres RQDWhen using diamond drill core,care must be taken to ensure that fractures caused by handing or the drilling process,are identified and ignored.12Palmstr

14、oms RQDFor exposure mapping,blast induced fractures should not be included when estimating Jv.Conclusion R Q D 总 结North America（北美）Deeres RQD has been widely used,particularly in North America,for the past 25 years.Some attempted to relate RQD to Terzaghis rock load factors and to rock bolt requirements in tunnels.新浪微博努力hard微信公众号HardPPT演界网店铺HardPPTBy 努力hard（刘健）UNIT 10Rock Mass Classification新浪微博努力hard微信公众号HardPPT演界网店铺HardPPT新浪微博努力hard微信公众号HardPPT演界网店铺HardPPT