期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
岩石纵波波速测值的影响因素研究 被引量:2
1
作者 陈晓鹏 张中俭 +1 位作者 周华 张涛 《工程勘察》 2019年第2期73-78,共6页
超声波技术被广泛应用于检测岩体性质。超声波纵波波速是反应岩体性质的重要参数。使用超声波测试仪测岩石的纵波波速时,换能器频率、换能器放置位置、耦合剂、岩石面理、含水状态等可能对波速的测值产生影响。本文在不同的测试条件下... 超声波技术被广泛应用于检测岩体性质。超声波纵波波速是反应岩体性质的重要参数。使用超声波测试仪测岩石的纵波波速时,换能器频率、换能器放置位置、耦合剂、岩石面理、含水状态等可能对波速的测值产生影响。本文在不同的测试条件下分别测试了岩石的纵波波速,分析了各个影响因素对测值的影响规律。结果表明,岩石纵波波速的测量结果受耦合剂种类、换能器频率、岩石面理、岩石含水状态的影响,不受换能器放置位置的影响。本文的研究结果可供岩石纵波波速测试的规范参考。 展开更多
关键词 纵波波速 换能器频率 换能器位置 耦合剂 岩石面理 含水状态 影响因素
下载PDF
The seismic CT method in measuring rock bodies 被引量:8
2
作者 Du Lizhi Zhang Xiaopei +2 位作者 Niu Jianjun Wang Xuege Feng Guolei 《Applied Geophysics》 SCIE CSCD 2006年第3期192-195,共4页
The seismic computed tomography (CT) method is derived from the basic principles of X-ray section scanning first applied in medical science. The method records P-wave arrivals between shots and receivers in separate... The seismic computed tomography (CT) method is derived from the basic principles of X-ray section scanning first applied in medical science. The method records P-wave arrivals between shots and receivers in separate boreholes. Using the velocity information from 2D seismic P-wave arrival inversion, we can determine the distribution of velocity in rock and soil bodies. This paper introduces a practical case of using the seismic CT method for detecting the structure of the rocks for tunnel engineering and to utilize SIRT algorithms for doing first arrival time iterative inversion. Compared with other exploration methods, it is more efficient and accurate. 展开更多
关键词 seismic computed tomography P-wave velocity travel time inversion.
下载PDF
Degradation of joint surface morphology, shear behavior and closure characteristics during cyclic loading 被引量:5
3
作者 FAN Wen-chen CAO Ping LONG Long 《Journal of Central South University》 SCIE EI CAS CSCD 2018年第3期653-661,共9页
In order to investigate the failure mechanism of rock joint,a series of laboratory tests including cyclic direct shear tests under constant normal load(CNL)conditions were conducted.Morphology parameters of the rock j... In order to investigate the failure mechanism of rock joint,a series of laboratory tests including cyclic direct shear tests under constant normal load(CNL)conditions were conducted.Morphology parameters of the rock joint surface were precisely calculated by means of a three-dimensional laser scanning machine.All test results were analyzed to investigate the shear behavior and normal displacement behavior of rock joints under CNL conditions.Degradation of rock joint surface during cyclic shear tests was also analyzed.The comparison results of the height parameters and the hybrid parameters of the joint surface during cyclic tests show that the degradation of the surface mostly happens in the first shear and the constant normal loads imposed on the joints have significant promotion effects on the morphology degradation.During cyclic shear tests,joints surfaces evolve from rough state to smooth state but keep an overall undulation.Dilatancy of rock joints degrades with the degradation of joint surface and the increase of normal loads.The closure deformation of joint is larger than that of the intact rock,and the normal stiffness increases with the increase of shearing times. 展开更多
关键词 rock joint constant normal load condition surface morphology degradation shear behavior joint closure characteristic
下载PDF
Thermography analyses of rock fracture due to excavation and overloading for tunnel in 30° inclined strata 被引量:3
4
作者 SUN XiaoMing XU HuiChen +2 位作者 HE ManChao GONG WeiLi CHEN Feng 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2017年第6期911-923,共13页
Large-scale physical model test of 30°inclined strata was conducted to investigate the damage mechanisms during the excavation and overloading using infrared detection.The experiment results were presented with t... Large-scale physical model test of 30°inclined strata was conducted to investigate the damage mechanisms during the excavation and overloading using infrared detection.The experiment results were presented with thermal images which were divided into three stages including a full face excavation stage,a staged excavation stage,and an overloading stage.The obtained results were compared with the previously reported results from horizontal,45?,60?,and vertical strata models.Infrared temperature(IRT)for 30°inclined strata model descended with multiple fluctuations during the full-face excavation.For the staged excavation,the excavation damage zone(EDZ)showed enhanced faulting-like strips as compared in the 45?,60?,and vertical models,indicating the intensified stress redistribution occurred in the adjacent rock mass.In contrast,EDZ for the horizontal strata existed in a plastic-formed manner.During the overloading,abnormal features in the thermal images were observed preceding the coalescence of the propagating cracks.The ultimate failure of the model was due primarily to the floor heave and the roof fall. 展开更多
关键词 deep tunnel inclined strata failure process large-scale physical model infrared thermal imaging technology
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部