（3）循环活动性(cyclic mobility)：循环活动性主 要曾被发现于相对密度较大（中密以上到紧密）的饱和无粘 性土的固结不排水循环三轴或循环单剪切和循环扭剪试验 中...
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最后，分析了钙质砂的循环活动性机理。
阐述了地震液化的三种表现形式砂沸、流滑和循环活动性的表现形式、作用机理和触发条件。
The behavior properties and corresponding mechanics of the three modes of liquefaction due to earthquake, was stated, namely sand boil, flow slide and cyclic mobility detailedly.
液化面作为累积剪切功的函数，从初始应力点的包络线开始，随着循环活动性的进行，逐渐接近破坏线。
The liquefaction front, originating from the envelope of initial effective stress points, gradually approaches the failure line as the cyclic mobility proceeds as a function of plastic shear work.
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