长期强度是指岩石在长期荷载作用下抵御破坏的强度值，岩石在长期荷载作用下会产生蠕变效应，故而把蠕变强度作为岩石的长期强度。 岩石既可发生稳定蠕变也可发生不稳定蠕变，这取决于岩石应力的大小。超过某一临界应力时，蠕变向不稳定蠕变发展。小于此临界应力时，蠕变按稳定蠕变发展。通常称此临界应力为岩石的长期强度。
... local shear failure|局部剪切破坏 long term strength|长期强度 long-term strength|长期强度 ...
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通过等时曲线簇确定该滑带土的长期强度。
The long term strength has gotten from the isochronal curves.
研究了高掺量粉煤灰混凝土的长期强度增长趋势。
The strength development in long time of concrete with high content of fly ash was investigated.
对滑坡滑带土进行剪切流变试验，得到长期强度和进入加速蠕变的临界强度。
The shear and rheologic tests related to sliding soil within landslide zones are conducted and long-term strength as well as critical strength of acceleration creep are obtained accordingly.
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