In this article, authors analyze advantages and disadvantages of common grouting strengthening foundation of existed buildings methods, and provide the enclosure grouting strengthening method.

For this reason,the method of finite element simulation analysis is used to study the problems of closing arch for grouting of high arc.

Based on a practical project, the applications of pressure grouting in strengthening the foundation of a block masonry building are discussed in this paper.

When the bearing stratum at the tip of bored pile is sandy soil stratum,the method of pile tip pressure grouting can effectively improve the bearing capacity of single piles.