中文摘要：

为了探讨在岩溶区采用深层搅拌法加固红粘土软弱下卧层,通过在不同水泥掺量、外加剂掺量条件下制备不同的水泥红土,并对水泥红土进行无侧限抗压强度试验。对比不同龄期、掺入比及掺加外加剂的效果,得出水泥土强度的几种主要影响因素及其与强度的关系,并推算不同水泥掺入比量、龄期水泥土之间的强度公式以及最佳加固效果时的水泥掺量为15%-25%。

英文摘要：

A study on soft sub-layer in karst area was carried out adopting deep mixing method. Different cement laterite was prepared under different cement content and additives,and unconfined compression strength tests were conducted on the cement laterite. There are some factors that affect the cement soil strength- the cement content plays a major role,and the additives also affect the strength of the cement soil. The strength of soil increases with the cure ages,and the best reinforcement effect can be achieved with the cement content of 15% - 25%.