深层搅拌技术在核安全级地基加固处理中的应用

Application of Deep Mixing Technique on Reinforcement of Nuclear Safety Foundation

摘要: 为了推广复合地基处理加固技术在核电厂核安全级物项地基中的应用，针对某核电站核安全级物项地基加固处理采取了水泥搅拌加固技术进行了方案设计及现场试验研究。现场试验结果表明：松散回填土地基采用水泥搅拌桩加固处理后，地基承载力特征值可由原来的200 kPa增至400 kPa以上；核安全物项主要控制指标剪切波速大幅度提升，由处理前的200 m/s提升到800 m/s以上，大大超过设计及规范要求的400 m/s。因此，水泥搅拌桩加固技术用于处理松填的回填土层不仅能大幅度提高地基承载力，更重要的是能大幅度提升核安全物项主要控制指标剪切波速，满足了核安全物项地基抗震要求，对今后核安全级地基处理提供很好的参考。

Abstract: This article introduces the application of deep cement mixing method in loose foundation (sand and gravel backfill) treatment and the changing of wave velocity, loading capacity, modulus of deformation and other performance index before and after using this method. The deep cement mixing method is seldom used in loose foundation (sand and gravel backfill) treatment. Its application is even rarer in treating the backfilled foundation with nuclear safety requirement. Therefore, this technique is innovative and serves as a good example for the future foundation consolidation and treatment.