通过在岩溶地区钢筋混凝土桩复合地基处理,利用复合地基、单桩的载荷试验成果,得到刚性桩复合地基承载力计算公式中桩间土承载力折减系数值,为在岩溶地区进行刚性桩复合地基设计提供一个地区建议。

By processing the reinforced concrete pile composite foundation in Karst area and using the experiment results of composite foundation and bearing load of single pile, the reduction factor of bearing capacity of rigid pile composite foundation is produced, which is a suggestion to the design of rigid pile composite foundation in Karst areas.

为进一步研究复合桩加固液化土地基机理，制备未加固、碎石桩与钢管桩、水泥土桩与钢管桩复合加固三种地基模型，模拟地震荷载，进行振动台试验。通过数据采集系统采集三种模型数据，整理出地基在振动过程中不同埋深处的超静孔隙水压力时程曲线和土压力时程曲线。结果表明：未加固、水泥土桩与钢管桩复合加固模型超静孔隙水压力增长到峰值7 kPa 左右，保持不变到试验结束，碎石桩与钢管桩复合加固达到峰值为5 kPa 左右，试验结束时减小到2.5 kPa 左右，其中碎石桩起到消散超静孔隙水压力的作用；未加固、水泥土桩与钢管桩复合加固的土压力达到峰值105 kPa 左右，之后减小了35 kPa 左右；碎石桩与钢管桩复合加固地基模型土压力值与峰值相等为110 kPa 左右，土体强度较高，复合地基承载能力较大。表明采用碎石桩与钢管桩复合加固不仅有效的抵抗土体液化，而且还提高了复合地基的承载能力，为碎石桩与刚性桩复合加固液化土在实际工程中的推广应用起到参考作用。

In order to study the mechanism of using composite pile to reinforce liquescent soil foun-dation, three models, including un-reinforced foundation, foundation reinforced by gravel pile and steel pipe pile, foundation reinforced by cement pile and steel pipe pile were prepared, and simula-ted seismic load was applied by the shaking table test. Pressure-time curve of excess pore water in different depth and pressure-time curve of earth in different depth were sorted out from the data col-lected by the data acquisition system in the three models during the vibration of foundations. The test results show that the pressure of excess pore water of the un-reinforced and foundation reinforced by cement pile and steel pipe pile was increased to the peak around 7 kPa and the pressure remained 7 kPa until the end of the test. The pressure of excess pore water of the foundation reinforced by gravel pile and steel pipe pile was increased to the peak around 5 kPa and it was reduced to about 2. 5 kPa

对刚柔性桩复合地基的作用机理、承载性能进行了深入的研究,并采用三维快速拉格朗日方法（FLAC3D）建立了刚柔性桩复合地基数值计算模型,对刚性桩和亚刚性桩的工作机理、垫层效应、传力特性、应力特征及复合地基部分参数对地基加固效果的影响进行了分析,计算及分析结果表明刚柔性桩复合地基能够较好地发挥了桩和桩间土的承载潜能,其形成的复合地基具有良好的加固效果。

The mechanism of rigid pile composite foundation bearing capacity conducted in-depth research,Fast Lagrangian Analysis of Continua in 3 Dimensions (FLAC3D)was employed to investigate the CM piles composite foundation,the work of the sub-rigid rigid piles and piles mechanism,cushion effect,transfer characteristics,the impact of stress characteristics and complex part of the foundation of the foundation reinforcement effect parameters were analyzed,and the results show that the calculation of rigid pile composite foundation can better play among piles and piles of soil bearing potential,the formation of composite foundation reinforced with good results.

本文简单介绍了“多桩型复合地基”的概念及分类，结合工程实例，阐述了多桩型复合地基的优越性，有效地推广了多桩型复合地基技术在工程实践中的应用。

this paper introduces the concept of “Multi-type-pile composite” and its classification. combining with engineering examples, this paper expounds the advantages of pile composite foundation, which is a more effective promotion of the pile composite foundation technology application in engineering practice.

介绍了复合载体夯扩桩的基础原理,论述了其优缺点,并以具体工程为例,对灰土挤密桩、人工挖孔桩、复合载体夯扩桩三种基础设计方案作了分析计算,同时比较了三者的经济性,指出复合载体夯扩桩经济效益显著,应用前景广阔。

The paper introduces basic principles and merits and defects of composite carrier compaction pile, analyzes and calculates basis design schemes of soil-lime compacted pile, artificial excavation pile and composite carrier compaction pile with specific engineering examples, and com-pares their economy. In the end, it points out that:composite carrier compaction pile has obvious economic benefits and wide application pros-pect.