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概要本文研究了多孔饱和软岩在循环载荷作用下的效应。其中一个典型的现象就是所谓的循环疲劳,在循环疲劳过程中材料在较静力强度低得多的应力水平下就被破坏。本文还研究在半静态和循环载荷作用下的岩石变形、强度和孔隙压力性质。另外,为了解长期强度还进行了蠕变试验。试验中所用的岩样是多孔软凝灰岩,其无侧限抗压强度大约为16(兆牛/米~2)。为了解蠕变、循环载荷和常规常应变速率试验间的相互关系,做了实验室试验。还对全应力——应变曲线的概念进行了评价。
Summary This paper studied the effect of porous saturated soft rock under cyclic loading. One of the typical phenomena is the so-called cyclic fatigue in which the material is destroyed at stress levels much lower than the static strength. This paper also studies the rock deformation, strength, and pore pressure properties under semi-static and cyclic loading. In addition, creep tests were performed to understand long-term strength. The rock samples used in the tests were porous soft tuffs with an unconfined compressive strength of approximately 16 (calories/m 2). Laboratory experiments were performed to understand the interrelationship between creep, cyclic loading, and conventional constant strain rate tests. The concept of a full stress-strain curve was also evaluated.