Cavity expansion theory is an important branch of theoretical methods in geomecahnics. It is concerned with the stress and displacement fields around cavities embedded in either linear or nonlinear media. Over the past 70 decades, cavity expansion theory has found many applications in the analysis and design of a variety of geotechnical problems, such as in-situ soil testing, deep foundations, tunnels and underground, piles and plate anchors.

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Related research can be divided into：

​Part 1. Non-Self-Similar Cavity Expansion Problems in Geomechanics.