NEW CONSIDERATIONS ON THE VAIONT SLIDE
NEW CONSIDERATIONS ON THE VAIONT SLIDE
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发表时间：
1968-08
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通讯作者：
L. Mueller
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作者：
L. Mueller
本文试图对自灾难发生以来发表的有关托克山滑坡的各种意见作一综述。在概述幻灯片上的可用文件后，从地质力学角度来看重要的数据来自这些文件中清除的地质情况。特别注意滑动面的形状和条件，并得出结论，在决定性区域，滑动面具有类似于岩石的形状，并且在西部下部基本上是水平的。与几份出版物相反，经过仔细检查，证明滑动面上不存在粘土。严格地说明了迄今为止在静态考虑的基础上进行滑动的后验计算的做法。这些计算中有几个平衡因素，如岩层的刚度、二次破坏的形成、剪切前的抗剪强度、后滑面的面积和滑面的确切形状等，至今没有考虑。这些因素已在详细的电子参考中考虑。计算结果表明，在运动开始之前，维持极限平衡所必需的摩擦力在平面上的值非常小。还表明，在这种情况下，静态重新计算的有效性值得怀疑，特别是因为这种计算不能解释水库水位变化期间发生的不同现象。因此，人们试图将滑动视为蠕变现象。最近的研究表明，最后的高滑动速度必须归因于水推力在节理中的作用，从而在摩擦力的自发损失中保持稳定。目前的知识导致的结论是，“群众触变性”可能只发挥了一个小角色的情况下，山TOC，但它是维持群众触变性经常发生在联合媒体。联系我们
THE PAPER TRIES TO GIVE A SYNOPSIS OF ALL OPINIONS CONCERNING THE ROCK SLIDE OF MOUNT TOC PUBLISHED SINCE THE CATASTROPHE. AFTER OUTLINING THE DOCUMENTS AVAILABLE ON THE SLIDE, THE DATA WHICH ARE IMPORTANT FROM A GEOMECHANICAL POINT OF VIEW ARE DERIVED FROM THE GEOLOGICAL SITUATION CLEARED UP IN THESE DOCUMENTS. PARTICULAR ATTENTION IS GIVEN TO THE SHAPE AND CONDITION OF THE SLIP SURFACE, AND IT IS CONCLUDED THAT IN THE DECISIVE AREAS THE SLIP SURFACE HAD A CHAIR-LIKE SHAPE, AND THAT IT WAS ESSENTIALLY HORIZONTAL IN THE LOWER WESTERN PART. CAREFUL INVESTIGATIONS HAVE PROVEN THAT, CONTRARY TO SEVERAL PUBLICATIONS, NO CLAY EXISTED ON THE SLIP SURFACE. THE PRACTICE USED SO FAR OF MAKING A-POSTERIORI CALCULATIONS OF THE SLIDE ON THE BASIS OF STATIC CONSIDERATIONS IS CRITICALLY EXAMINED. SEVERAL FACTORS OF EQUILIBRIUM ARE NOT TAKEN INTO ACCOUNT IN THESE CALCULATIONS UP TO NOW, SUCH AS THE STIFFNESS OF THE ROCK LAYERS, THE FORMATION OF SECONDARY FAILURES AS WELL AS THE SHEAR STRENGTH PRIOR TO SHEARING THE AREAS OF THE LATER SLIP SURFACE AND THE EXACT SHAPE OF THE SLIP SURFACE. THESE FACTORS HAVE BEEN CONSIDERED IN A DETAILED ELECTRONIC RECOMPUTATION. THE COMPUTATION SHOWS THAT THE FRICTION VALUES ON THE SAME PLANE NECESSARY TO MAINTAIN THE LIMIT EQUILIBRIUM IMMEDIATELY BEFORE THE ONSET OF THE MOVEMENT ARE RIDICULOUSLY SMALL. IT IS ALSO INDICATED THAT THE VALIDITY OF STATIC RECALCULATIONS IN THIS CASE IS OPEN TO QUESTION, ESPECIALLY SINCE SUCH CALCULATIONS CANNOT EXPLAIN DIFFERENT PHENOMENA WHICH OCCURRED DURING THE VARIATION OF THE RESERVOIR LEVEL. THEREFORE, AN ATTEMPT HAS BEEN MADE TO CONSIDER THE SLIDE AS A CREEP PHENOMENON. RECENT INVESTIGATIONS SUGGEST THAT THE FINAL HIGH SLIDE VELOCITY MUST BE ATTRIBUTED TO THE ACTION OF WATER THRUST IN THE JOINTS RESULTING IN A SPONTANEOUS LOSS OF FRICTION. THE PRESENT KNOWLEDGE LEADS TO THE CONCLUSION THAT "MASS THIXOTROPY" MAY HAVE PLAYED ONLY A MINOR ROLE IN THE CASE OF MOUNT TOC, BUT IT IS MAINTAINED THAT MASS THIXOTROPY OCCURS FREQUENTLY IN JOINTED MEDIA. /AUTHOR/