柱状节理玄武岩隧洞破坏模式及其力学机制模拟

发布时间：2018-01-05 03:21

本文关键词：柱状节理玄武岩隧洞破坏模式及其力学机制模拟　出处：《岩土力学》2015年03期 　论文类型：期刊论文

【摘要】：柱状节理岩体由于其内部赋存大量的隐节理面,开挖卸荷后极易出现隐节理面开裂松弛等特征,导致其破坏模式异于一般岩体。其破坏模式主要受到异常发育的节理面和较高地应力的共同作用影响。由于柱状节理岩体节理面发育,岩体结构控制型破坏占主要部分,包括单临空面节理面滑移(塌方)、多临空面节理面滑移(塌方)、与错动带、断层等弱面相组合的坍塌等破坏模式;应力控制型破坏主要为河谷侧顶拱喷层开裂;应力-结构面型破坏主要为岩性交界处的节理岩体塌落等。柱状节理岩体表层主要发生柱内竖直隐节理面和柱间节理面的拉破坏,而围岩内部的柱状节理主要发生柱间节理面的剪切破坏。因此,现场柱状节理的支护也应主要包括两个方面:以喷射混凝土钢纤维来阻止柱状节理岩体表层的张性开裂,以系统锚杆来控制柱状节理岩体内部的剪切破坏。
[Abstract]:The columnar jointed rock mass due to the occurrence of a large number of hidden inside the joint surface, after excavation easily hidden joints cracking relaxation characteristics, lead to the failure mode is different from the common rock. The failure mode is mainly affected by the abnormal development of the joint and co action of high stress. The influence of the columnar jointed rock mass joint development, control of rock mass structure failure accounted for the major part, including the joint single free surface slip (collapse), joint multi slip surface (collapse), and fault zone, collapse failure mode of weak fault surface combination; stress control type failure mainly for shotcrete layer cracking valley side and top arch stress; surface structure failure of jointed rock mass are mainly lithologic junction collapse. Columnar jointed rock mass surface occurs mainly in the vertical column joints and column hidden between the joints tensile failure, and columnar joints of internal surrounding rock mainly occurred between the columns The shear failure of joint surface. Therefore, the support of on-site columnar joints should also include two aspects: the shotcrete steel fiber is used to prevent the tensile cracking of the surface of the columnar jointed rock mass, and the system bolt is used to control the shear failure of the cylindrical jointed rock mass.

【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;东北大学资源与土木工程学院;
【基金】：国家自然科学基金重点项目(No.11232014);国家自然科学基金项目(No.41372315)
【分类号】：TU45
【正文快照】： 1引言水电作为可再生的清洁能源,在我国能源发展史中占有极其重要的地位,进入21世纪,国家从能源的可持续供应、西部大开发等方面考虑,确定了优先开发水电的方针,我国水电进入加速发展时期。目前,我国的水电工程建设主要集中在西南高山峡谷地区,在该地区二叠系上统峨眉山玄武岩

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