深基坑SMW工法模拟试验研究及工作机理分析

通过主动侧加载模拟开挖卸载，进行了基坑SMW工法围护结构与型钢围护结构的室内模型对比试验。试验结果表明：SMW工法相对于单独型钢围护结构，由于水泥土对型钢的围箍作用，使型钢、水泥土成为一整体，共同协调工作，提高了型钢的刚度，同时有效地起到了减小水平位移的作用。SMW工法结构内力相对于单独型钢围护结构内力，由于水泥土的作用，其内力明显要小，与工程实测规律一致。从不同角度探讨了SMW工法的工作特性、型钢-水泥土组合结构的相互作用机理。

Simulation test & performance mechanism analysis of SMW engineering method in deep foundation pits

model comparison tests of SMW engineering method and shaped steel exterior-protected construction are proceeded by loading on active side to simulate unloading on excavation side. Test results show that: shaped steel and cement soil of SMW engineering method can be a whole body and perform jointly compared with single shaped steel exterior-protected construction because of cement soil enclosing of shaped steel, so that stiffness of shaped steel is increased; and horizontal displacement can be decreased effectively. Internal force of SMW is less than that of single shaped steel exterior-protected construction obviously because of cement soil; this is accordant with actual measurement of engineering. Performance character and interacting mechanism of SMW are discussed from various angles.