With the help of plastic hinge theory and collapse theory, the formulas for calculating strength failure load and the method for computing collapse load were established respectively.
分别利用塑性铰理论和压溃理讨论了强度计算问题，提出了强度承载能力计算公式和压溃荷载计算方法。
Finally, according to passive failure theory, the stress SLATE in plastic soil zone outside cluster of piles is presented.
同时还用被动破坏理论阐述了群桩外部塑性区土中的应力状态。
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