应力途径对凝灰岩力学特性的影响 English Version
The Effects of the Process of Stresses on Mechanical Properties of Tuff Rocks
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摘要: 本文从地下洞室的应力变化的实际应力途径出发,研究了在轴向加载的同时,减小侧压的三轴试验方法。为了比较,还对恒侧压,增加轴向荷载的方式进行了平行试验。试验表明,两种加载途径的强度特性大致相似,但变形特性、脆延性差异较大。本文认为通过应力途径符合于实际工程应力变化的三轴试验来确定岩石的力学特性是很必要的Abstract: According to the actual process of stress changes in underground excavations, a triaxial test method, using a loading pattern in which confined pressure is being reduced when exerting an axial loading, is introduced. In order to be compared, the expe- riment using general loading patterns, namely, increasing axial loading under constant confined pressure, was performed.The result shows that for these two load processes the strength characters are basically the same while deformation properties and brittleness and ductility are quite different. It is necessary to employ such a triazial test of which the stress process is consistent with the stress changes in an actual engineering practice to determine the mechanical properties of rocks.
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