【摘要】 本文以六盘水九洞桥污水处理工程为例,结合地勘报告对拟建场地内地基进行了桩基础、换填垫层、沉管灌注桩复合地基等地基处理方案的对比与分析;并根据建构筑物平面尺寸及荷载大小确定其地基处理方案。介绍了换填垫层、沉管灌注桩的地基处理计算和设计;对主要水池构筑物地基处理后的承载力变化和地基变形进行计算分析。阐述了复合地基施工阶段主要步骤及技术难点,沉管灌注桩静载荷试验的验收依据和换填垫层压实度、承载力检测的要点。通过对本案例设计与分析,为今后岩溶发育场地类似工程的地基处理提供设计参考。更多还原

【Abstract】 This paper takes Liupanshui Jiudong Bridge wastewater treatment project as the research object.Based on the geological survey report,three foundation treatment options,pile foundation,soil replacement,and concrete-filled steel pipe piles,are analyzed and compared.The appropriate foundation treatment plan for each structure is determined based on the structure dimensions and loads.The bearing capacity and foundation deformation of the main structures after foundation treatment are calculated and analyzed.For concrete-filled steel tube piles,the main steps in the construction stage,technical difficulties,and acceptance criteria for static load tests are discussed;for soil replacement methods,soil compaction and bearing capacity testing are discussed.This study provides design references for foundation treatment of similar projects in geologic karst areas in the future.更多还原