强夯置换法在高填方地基处理中的应用

The Application of Dynamic Consolidation Replacement Method in the High Embankment Treatment

工程实践证明强夯置换法对于软弱地基的处理具有较好的加固效果,但目前尚无成熟的设计施工方法。本文以四川九寨黄龙机场高填方地基处理工程为背景,介绍了强夯置换法加固软弱土层的现场试验,对实测夯沉量、地表隆起量等试验结果进行了分析。同时,运用动力触探测试及室内土工试验等手段对夯后地基的加固效果进行了检测分析。综合试验及检测结果表明,应用此法处理机场工程软弱地基达到了预期的加固效果,原地面以下6m范围内动探击数均大于5击,物理力学指标也均有相当改善。目前,该试验成果已用于指导机场地基处理与高填方填筑体施工,对于其它类似工程亦有一定的借鉴意义。

It has been shown by many engineering practices that dynamic consolidation replacement methodhas a good effect on soft foundation treatment which is still lacks being used to improve the foundation ofsand, gravel, clay collapsible loess and so on. Howerver, preferable theory of dynamic consolidation re-placement, for design and construction. This paper presents a systematic experiment investigation for softsoil treatment by dynamic consolidation replacement method in high embankment engineering of SichuanJiuzai-Huanglong Airport Ground, The experimental results of impacted settlement and ground upheavalare analyzed. The consolidation effect of foundation is inspected and evaluated by means of dynamic pene-tration test and laboratory geotechnical test. According to the results of experiment and inspection, theconclusion is drawn that consolidation effect is perfect as expected and the bearing capacity of foundation iseven higher than that of the design requirement. In addition, the physical and mechanical properties offoundation have been greatly improved and the dynamic penetration number in the range of 6m depth underthe ground is larger than 5. Presently, the experiment result has been used for the construction of AirportGround, and is also of value to other similar engineering.