An Study On Cement-Soil Pile Improving Soft Foundation

The cement-soil pile improved soft soil foundation have a lot of advantages, but the applications of the cement-soil pile was limited in many place because of a great deal of accidents. The author has done a lot of experiments on cement-soil pile improving soft foundation.It is most important that do researching on the bearing capacity, settlement analysis of the composite foundation and how to check the quality of the pile .The difficulty of the research lies in the heterogeneity of the composite foundation. On account of most of the existing research was limited in single pile and single pile with a cap. This paper has done six single pile , one single pile, one three piles composite foundation and two-origin foundation static load experiments and obtained the principal value. The author found the formula in the code is vaguely in deals with the origin foundation bearing capacity and its reduction coefficient .Two pieces of advice were put forward to improve the formula and achieved satisfied results in fact engineer construction.The pile is belong to typical friction pile. It is also given detailed value to prove the point that it is most important to increased replacement ratio at reasonable degree. It is not always good at increased the cement ratio; sometimes it is even harmed to the strength of the pile. The strength of the pile must matches the strengths of the origin soft foundation. Improved fixing methods of strain meter and how to calculate the deformation modulus, the load transfer behavior of cement-soil pile, the compound foundation bearing capacity, pile-soil stress ratio with the increasing of the load are analyzed and studied. Some important results are obtained here. Because the strength of the pile influences the compound foundation bearing capacity, we must control the mixing ratio of the pile to control the strength of the pile. Some experiments has been done to optimization the mixing ratio of the pile and try to establish the correlativity relativity between the. Strength the quality checking of the pile is also important, but the existing checking methods aren't satisfied by now. A good method to check the quality of the pile was found in this paper after studied carefully by doing some experiments and studied the existing method.The specific properties of cement-soil pile improving soft foundation and how to check the quality of the pile have been studied systematically, thus providing theoretical basis and reference for cement-soil pile technique in pile engineer application.