• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Geosciences >The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters
【24h】

The Influence of Pre-Existing Deformation and Alteration Textures on Rock Strength, Failure Modes and Shear Strength Parameters

机译：预先存在的变形和蚀变纹理对岩石强度，破坏模式和抗剪强度参数的影响

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

This study uses the uniaxial compressive strength (UCS), the indirect tensile strength (ITS) and the point load tests (PLT) to determine the strength and deformation behavior of previously deformed and altered tonalite and anorthosite. In general, veined samples show higher strength because the vein material has both cohesive and adhesive properties while fractures have no cohesion, only frictional resistance. This implies that each rock category has to be treated independently and absolute strength predictions are inaccurate. Thus, the conversion factor k is a sample specific parameter and does not have a universal value. The ratio of UCS/ITS appears to be related to the rock strength and can be used to classify rocks based on their strength. The shear strength parameters, the friction angle and the cohesion, cannot be calculated for rocks with pre-existing planes of weakness. Reactivation is favoured only for planes oriented less than 20° to the maximum stress. For planes oriented between 20° and 50° to the maximum stress, failure occurs by a combination of reactivation and newly formed fractures, while for orientations above 50°, new shear fractures are favoured. This suggest that the Byerlee’s law of reactivation operates exclusively for planes oriented ≤10° to the maximum stress.
机译：这项研究使用单轴抗压强度（UCS），间接抗张强度（ITS）和点载荷试验（PLT）来确定先前变形和变色的方钠石和钙长石的强度和变形行为。通常，带纹理的样品显示出更高的强度，因为带纹理的材料既具有内聚力又具有粘合性，而断裂没有内聚力，只有摩擦阻力。这意味着必须分别对待每个岩石类别，并且绝对强度预测不准确。因此，转换因子k是样本特定参数，并且不具有通用值。 UCS / ITS的比率似乎与岩石强度有关，可用于根据岩石强度进行分类。对于具有弱化面的岩石，无法计算抗剪强度参数，摩擦角和内聚力。仅对于小于最大应力的20°定向的平面，才支持重新激活。对于定向到最大应力在20°和50°之间的平面，由于重新活化和新形成的断裂的结合而发生破坏，而对于50°以上的定向，则倾向于使用新的剪切断裂。这表明Byerlee的再激活定律专门针对最大应力≤10°的平面起作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号