水泥土搅拌桩沿海软基处理

在沿海软土地基上直接修建公路、铁路会产生路基失稳等问题,必须进行地基处理。结合实际工程,进行布桩模拟分析,并优化水泥土搅拌桩布桩参数。通过室内配合比试验、现场成桩试验,分析水泥土强度及水泥土搅拌桩成桩质量影响因素。结果表明:提出的布桩方案安全可行,节约成本;水泥土中水泥的最佳质量分数为16%~18%,短期龄期无侧限抗压强度可达标准龄期的60%~70%,缩短了工期;施工中成桩工艺采用四搅四喷成桩质量最优;防腐剂对桩体的成桩质量和耐久性至关重要。通过成桩质量检测,综合判定此工程水泥土搅拌桩加固效果符合要求。研究结果对类似工程具有一定的参考价值,并为制定技术标准和工法提供了现场依据。

Treatment of coastal soft foundation with cement-soil mixing pile

Direct construction of roads and railways on coastal soft soil foundation leads to subgrade instability and other problems, and foundation treatment must be carried out. Based on the actual project, the pile arrangement simulation analysis was carried out and the pile arrangement parameters of cement-soil mixing piles were optimized. Through indoor mix proportion test and on-site pile forming test, the influencing factors of cement-soil strength and pile forming quality of cement-soil mixing pile were analyzed. The results showed that the proposed pile arrangement scheme was safe and feasible and cost saving. The optimal range of cement content in cement soil was 16%-18%, and the unconfined compressive strength at short-term age could reach 60%-70% of the standard age, which shortened the construction period; During the construction, the pile-forming technology of four stirring and four spraying was of the best quality. Preservatives were very important to the quality and durability of pile body. Through pile quality inspection, it was comprehensively judged that the reinforcement effect of cement-soil mixing pile in this project meeted the requirements. The research results had certain reference value for similar projects and provide on-site basis for the formulation of technical standards and construction methods.