论文部分内容阅读
由于受最大有效加固深度的限制,强夯置换在软弱土层深厚的大型油罐地基中的应用受到了制约。结合云南某炼油项目地基处理工程,通过多种检测手段对强夯置换试验区地基加固效果进行了分析和评价,确定了强夯置换墩长度、墩底软弱土层和墩间土加固效果,并根据试验区检测结果,确定10万m~3油罐地基分层强夯置换的设计施工参数。分层强夯置换方案中,底层采用柱锤强夯置换,以形成较长的置换墩来穿透软弱土层;顶层回填土层采用平锤强夯置换,使松散回填土得到立体全方位的挤密加固。大面积施工检测结果和油罐充水预压监测结果表明,油罐地基承载力和变形均能满足相关规范的要求,分层强夯置换在该项目中具有较好的地基加固效果,可在类似工程中推广应用。
Due to the limitation of the maximum effective reinforcement depth, the use of dynamic replacement of displacement in the deep foundation of a large oil tank with weak soil is restricted. Based on the foundation treatment project of a refinery project in Yunnan Province, the reinforcement effect of the foundation in the dynamic compaction replacement test area was analyzed and evaluated by various testing methods. The effect of replacement of the compacted abutment, the consolidation effect of the weak soil layer and the pier between the pier and the soil was determined According to the test results of the test area, the design and construction parameters of dynamic compaction displacement of 100,000 m3 ~ 3 oil tank foundation are determined. Stratified dynamic compaction replacement scheme, the bottom column by dynamic compaction of the column hammer to form a longer replacement pier to penetrate the soft soil layer; top backfill soil with flat-hammer dynamic replacement, so loose backfill soil to be three-dimensional all-round Squeeze tight reinforcement. The results of large-area construction test and monitoring results of preloading of filling water in oil tank indicate that the bearing capacity and deformation of oil tank foundation can meet the requirements of relevant norms. Hierarchical dynamic compaction replacement has better foundation reinforcement effect in this project. Similar projects in the promotion and application.