采用高精度滑动测微计测试AM扩底桩在各级荷载下的桩身应变，测试精度高，测试结果可靠。
The pile strain of AM bulb cast-in-place pile is tested by high precision sliding micrometer, which can have high precision and reliable testing results.
该方法不仅能够考虑土的应力应变性质，而且能够在任意时刻确定最危险滑动面的位置及安全系数。
The method not only can consider behavior of stress strain of soil, but also can determine the most dangerous slip surface and its factor of safety at any time.
在考虑裂纹受压闭合与滑动摩擦的基础上，给出了损伤张量、损伤应变及有效弹性常数。
Considering the crack-closing and friction between crack-surface under compression, the damage tensor, damage strain and effective elastic moduli are formulated.
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