检索结果-南通市图书馆

Development of a multivar.ate empir.cal model for.pr.dicting weak r.ck mass modulus

Inter.ational jour.al of Mining Science and Technology 2015年第4期25卷 545-552页

作者： kallu r.j r. Keffeler.Evan r. Watter. r.ber. j. Aghar.zi Alir.za Depar.ment of Mining Engineer.ng University of Nevada r.SPEC Consulting and Ser.ices Univer.ity of Nevada Itasca Houston Inc.

Estimating weak r.ck mass modulus has histor.cally pr.ven difficult although this mechanical pr.per.y is an impor.ant input to many types of geotechnical analyses. An empir.cal database of weak r.ck mass modulus with associated detailed geotechnical par.meter. was assembled fr.m plate loading tests per. for.ed at under.r.und mines in Nevada, the Bakhtiar. Dam pr.ject, and Por.ugues Dam pr.ject. The database was used to assess the accur.cy of published single-var.ate models and to develop a multivar.- ate model for.pr.dicting in-situ weak r.ck mass modulus when limited geoteehnical data ar. available. Only two of the published models wer. adequate for.pr.dicting modulus of weak r.ck masses over.lim- ited r.nges of alter.tion intensities, and none of the models pr.vided good estimates of modulus over.a r.nge of geotechnical pr.per.ies. In light of this shor.coming, a multivar.ate model was developed fr.m the weak r.ck mass modulus dataset, and the new model is exponential in for. and has the following independent var.ables：（1） aver.ge block size or.joint spacing, （2） field estimated r.ck str.ngth, （3） dis- continuity r.ughness, and （4） discontinuity infilling har.ness. The multivar.ate model pr.vided better.estimates of modulus for.both har.-blocky r.ck masses and intensely-alter.d r.ck masses.

关键词： In-situ modulus Weak r.ck mass Pr.liminar. design Elastic defor.ation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cor.elations between dir.ct and indir.ct str.ngth test methods

引用

Inter.ational jour.al of Mining Science and Technology 2015年第3期25卷 355-360页

作者： kallu r.j r.ghanchi Pedr.m Depar.ment of Mining Engineer.ng University of Nevada

The difficulties associated with per.or.ing dir.ct compr.ssion str.ngth tests on r.cks lead to the development of indir.ct test methods for.the r.ck str.ngth assessment. Indir.ct test methods ar. simple, mor. economical, less time-consuming, and easily adaptable to the field. The main aim of this study was to der.ve cor.elations between dir.ct and indir.ct test methods for.basalt and r.yolite r.ck types fr.m Car.in tr.nd deposits in Nevada. In the destr.ctive methods, point load index, block punch index, and splitting tensile str.ngth tests ar. per.or.ed. In the non-destr.ctive methods, Schmidt hammer.and ultr.sonic pulse velocity tests ar. per.or.ed. Cor.elations between the dir.ct and indir.ct compr.ssion str.ngth tests ar. developed using linear.and nonlinear.r.gr.ssion analysis methods. The r.sults show that the splitting tensile str.ngth has the best cor.elation with the uniaxial compr.ssion ***, the Poisson's r.tio has no cor.elation with any of the dir.ct and indir.ct test r.sults.

关键词： Uniaxial compr.ssion str.ngth test Indir.ct str.ngth test methods Cor.elation r.gr.ssion analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Inflatable r.ck bolt bond str.ngth ver.us r.ck mass r.ting (r.r.： A compar.tive analysis of pull-out testing data fr.m under.r.und mines in Nevada

引用

Inter.ational jour.al of Mining Science and Technology 2016年第1期26卷 19-22页

作者： Bar.ar. Chase kallu r.j r. War.en Sean Thar.ja r.hul Depar.ment of Mining Engineer.ng University of Nevada Reno 89557 USA

The pur.ose of this paper.is to establish confidence in anticipated minimum bond str.ngth for.inflatable r.ck bolts by compar.ng the bond str.ngth to var.able geotechnical conditions using the r.ck mass r.ting （r.r. system. To investigate a cor.elation between these par.meter., the minimum bond str.ngth of pull-out tested inflatable r.ck bolts was compar.d to the r.r.of the r.ck in which these bolts wer. placed. Bond str.ngth vs. r.r.plots indicate that expected minimum bond str.ngth is positively cor.e- lated with r.r. however. the cor.elation is not str.ng. Cumulative per.ent gr.phs indicate that 97~; of pull-out tests r.sult in a minimum bond str.ngth of 3.3 and 1.7 ton/m in r.r.〉 45 and 〈45, r.spectively. Although lower.bond str.ngths ar. mor. commonly encounter.d in low r.r.gr.und, high bond str.ngths ar. possible as well, yielding higher.var.ability in bond str.ngths in low r.r.gr.und. Bond str.ngth of fr.ction bolts r.lies on contact between the r.ck bolt and dr.ll hole. Exper.ence in Nevada indicates that r.r.is known to affect both the quality and consistency of dr.ll holes which likely affects bond str.ngth. Dr.lling and bolting in low r.r.gr.und is mor. sensitive to dr.lling and bolting pr.ctices, and str.tegies for.maximizing bond str.ngth in these conditions ar. discussed.

关键词： r.ck mass r.tingr.r.ock boltPull-out testBond str.ngth

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：