粒料桩复合地基承载力发挥值试验研究

结合实体公路工程，通过现场试验段土压力监测，计算复合地基承载力发挥值；结合破坏模式，对其复合地基承载力发挥值进行分析。研究结果表明:粒料桩复合地基按照土体先破坏计算的复合地基承载力发挥值，接近现场载荷试验结果，复合地基承载力可通过桩墩间土压力进行计算确定；不论是强夯置换砾石墩还是振动砾石桩，其破坏形式是桩（墩）间土先破坏引起的整个复合地基的破坏。

Experimental Study on Efficiency Factor of Bearing Capacity of Granular Pile Composite Foundation

Combining with substantial highway engineering，efficiency factor of bearing capacity of composite foundation was calculated through soil pressure monitoring at the section for site test and，with failure mode，it was analyzed as well.The study result shows that for granular pile composite foundation，the efficiency factor of bearing capacity calculated in terms of earth mass failure taken place first is close to the result of on-site load test and the bearing capacity may be calculated through soil pressure between piles/piers.In addition，the failure mode is such that the whole composite foundation is destroyed in the event that the soil between piles（piers）is destructed at first，regardless of dynamic replacement gravel pier or vibration gravel pile.