cavity expansion method(CEM)in infinite space is usually used to simulate the expansion of piles. But pile jacking took place in semi-infinite space
the difference of stresses in boundary between semi-infinite space and infinite space should be analyzed. Considered the surface stresses correction of semi-infinite problem and based on existing research
a new elastic method is presented to develop the CEM to satisfy the semi-infinite space by using stress function. Surface stresses can be corrected by using this method. It is proved to be advanced compared with existing methods and can be used for further research.