A simple criterion for the machinability of hard rocks     

S. P. Singh 《Geotechnical and Geological Engineering》1989,7(3):257-266

Conclusions The application of mechanical methods for rapid excavation requires more detailed and precise knowledge of the site, but there is no single parameter which can provide a comprehensive measure for the selection and performance of a tunnel boring machine.The machinability index proposed in this paper is based on four different parameters which influence the performance of a tunnelling machine and are widely accepted by the engineers and geologists. In order to develop a comprehensive measure regarding the borability of rocks,in situ conditions must be evaluated. The machinability index coupled with thein situ information would facilitate judicious decisions regarding the application and selection of tunnel boring machines.The geological conditions and rock characteristics cannot be controlled but their knowledge can prevent costly mistakes in equipment selection and assist in identifying alternative excavation systems, therefore a thorough site investigation can substantially reduce the economic and technical risks associated with tunnelling and mine development.  相似文献   

利用位场及其高阶导数的功率谱计算岩层的深度与厚度   总被引：3，自引：2，他引：3       下载免费PDF全文

侯重初  李保国 《地球物理学报》1988,31(1):90-98

本文导出了利用重力与磁异常及其高阶导数的功率谱计算密度体和磁性体上顶与下底埋深的近似公式,还提供了利用垂向或水平导数谱计算深度的方法。理论模型的试验结果表明,由近似公式计算的精度可以满足实际需要。本文最后根据一条重力剖面资料,计算了密度层上、下界面。  相似文献   

Influence of “stress reversal” on rock resistivity during loading procedure     

Chen Dayuan  Chen Feng  He Guoyu 《地震学报(英文版)》1988,1(3):84-92

The properties of rock resitivity were studied under pressure, particularly with “stress reversal”, a procedure in which the pressure applied was increased and decreased. It was observed that, 1) With pressure increasing, the main feature of resistivity change was increase-steady-decrease for high-saturation rock samples (saturation 70–100%). But the main feature for low-saturation samples was different. 2) In 10 out of 11 cases of “stress reversal” for high-saturation samples the resistivity droped (about 2%). Such drop could explain the anomalies in geoelectricity terms, which are commonly observed before earthquakes in China. 3) It was also observed shortly before rock failure that, a) the resistivity drops more dramatically (about 20%) during “stress reversal” period, which is much more than ordinary drops. b) these drops occurred not only during stress decrease but also during stress increase. c) Resistivity exhibits anisotropy: the resistivity along different directions may differ by 10%. These three features may indicate that the rock is nearing failure, while ordinary resistivity drops are only connected with “stress reversal” and may not mean the imminence of rock failure. 4) Resistivity increase was observed during the “stress reversal” period for low-saturation rock samples. The results mentioned above were explained with the effect of water flowing in and out of the cracks of rock. The temporary factors which yield a reduction of the maximum main stress, may enhence the possibility of earthquake occurrence.  相似文献   

中国东南几条变质带中的氧同位素组成   总被引：1，自引：0，他引：1  

谢窦克 《岩石学报》1993,9(2):125-135

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豫西东秦岭造山带核部杂岩中钙质变质岩的变质作用演化   总被引：3，自引：0，他引：3  

陈能松  张兴辽 《岩石学报》1993,9(3):240-254

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新疆准噶尔脉岩群地质及成因   总被引：17，自引：0，他引：17  

齐进英 《岩石学报》1993,9(3):288-299

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岩石分级的理论与实践   总被引：3，自引：1，他引：3  

王维钢  单守智 《工程地质学报》1994,2(3):43-53

本文在介绍国际上的两个分级系统和国内的三个单项岩石分级及岩石三性综合分级的基础上，结合实例阐述了岩石分级理论和应用的新进展，并进一步讨论了岩石分级课题在深度和广度两个方面扩展的问题。  相似文献   

岩体结构面粗糙度系数JRC的定向统计研究   总被引：5，自引：2，他引：5  

杜时贵 《工程地质学报》1994,(3)

本文回顾了岩体结构面粗糙度系数ＪＲＣ的研究成果，分析了各种ＪＲＣ研究方法的应用范围。在野外实际结构面形态的详细调查和深入研究的基础上，发展了Ｂａｒｔｏｎ直边法，并提出按岩性定向统计研究结构面粗糙度系数ＪＲＣ的科学思想。  相似文献   

祁县王村锶—偏硅酸饮用天然矿泉水     

孙富国 《华北地质矿产杂志》1994,9(4):476-480

王村矿泉水为松散岩类孔隙水和碎屑岩裂隙水的混合水。它受深循环远源补给。矿泉水的动态稳定、水质优良、口感纯正，属锶—偏硅酸饮用天然矿泉水，是山西较好的饮用矿泉水源之一，有良好的开发前景。稷山南阳矿泉水是一个含锶—锌—偏硅酸等多种微量元素的重碳酸硫酸钠型饮用天然矿泉水。该矿泉水处于侯马断陷盆地内次一级断裂的复合部位，赋存于中更新统中下部的中细砂层中。水量丰富，涌水量可达８００ｍ￣３／ｄ。此矿泉水动态稳定，口感纯正，产地环境优美，无任何污染。自１９８８年发现，１９８９年开发利用至今，该矿泉水、矿泉饮料畅销不衰，是一处具有发展远景的优质矿泉水。  相似文献   

Mechanisms of brittle fracture of rock with pre-existing cracks in compression   总被引：5，自引：0，他引：5  

L. N. Germanovich  R. L. Salganik  A. V. Dyskin  K. K. Lee 《Pure and Applied Geophysics》1994,143(1-3):117-149

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