土工格室＋碎石桩复合地基承载机理及承载力计算方法探讨

针对土工格室＋碎石桩复合地基这一新型地基处理方式，首先，全面分析了其独特的承载机理，在此基础上，着重对其承载力计算进行了研究。将该结构分为上下两部分分别考虑，对于底层的碎石桩复合地基，引进圆孔扩张理论，导出了桩体与土体承载过程中的应力应变计算公式，并充分考虑碎石桩与桩间土的相互作用及布桩方式影响，得到其承载力计算方法；而后结合土工格室的受力特点，提出格室垫层承载力计算公式。最后，通过算例，验证了文中计算公式的可行性。

Study on the Capacity Mechanismand Model and Calculation of Geocell Mattress and Gravel Pile Composite Foundation

Firstly, the work mechanics of geocell mattress and gravel pile composite foundation on dis crete material pile is studied deeply, based on which, the bearing capacity method is studied in the paper. The new method takes the structure into two parts. According to the gravel pile composite foundation, the the ory of round - hole expansion is used to calculate the stress-strain of pile and soil in loading process, based on which, the calculation of loading capacity is derived which can consider the mutual action between pile and soil and the influence of pile arrangement. Then, combined with the mechanical character, capacity computa tional formula is deduced. Finally, an engineering example is discussed to verify the method.