Abstract:The characteristics and harm of weak soil are briefly analyzed, and the principles and necessity of weak soil foundation disposition are introduced. Based on the practical engineering cases, the application effect of cement soil mixing piles in weak soil foundation of urban road is studied. The post-construction settlement values (road center) and the post-construction settlement rules of subgrade with the different heights of embankment fill under the three setup construction conditions are calculated and analyzed respectively. The conclusion shows that under some conditions, compared with the common cement soil mixing pile composite foundation treatment method, the long-pile + short-pile type of cement soil mixing pile composite foundation treatment method is more effective, which can not only improve the bearing capacity of the foundation, but also reduce the post-construction settlement of the subgrade and shorten the construction period. And the expected effect is achieved and there are some referring values.
