软土地基上高填方刚性涵洞地基处理及其设计原则

软土地基上设置刚性涵洞,面临着地基沉降和不均匀沉降的控制以及地基处理后的应力集中两大难题。涵洞地基处理方法运用不当会对涵洞结构的受力状态产生较大的影响。论文分析了软土地基上高填方涵洞地基承载力特性,同时探讨了地基处理的范围及处理后的地基刚度对涵洞结构受力特性的影响;在此基础上提出了涵洞地基的设计原则。研究结果表明：涵洞地基设计应充分考虑软土固结和基础的埋深效应,涵洞地基处理后的刚度过大、地基处理的深度过大或处理的宽度过窄都会导致涵洞顶部的土压力和结构内力增大。

Ground Treatment and Design Principle of High-fill Rigid Culvert Over Soft Ground

Ground settlement and uneven settlement controlling and stresses concentration on culverts after ground treatment be frequently encountered when rigid culverts have been installed over soft ground. Improper ground treatment may affect the work performance of culvert. Numerical simulation and laboratory tests were conducted to investigate the characteristic of soft ground bearing capacity under high fill. The influences of ground treatment area and the ground stiffness after treatment on structure stress states of culvert were discussed in detail. Moreover, the principles of culvert foundation design were proposed based on the abovementioned researches. Study results show that soft ground consolidation and buried depth effect of culvert foundation should be considered. The stiffer of the ground after treatment and the deeper of ground treatment depth, as well as the narrower of ground treatment width, the higher of earth pressure on culvert and higher structure internal forces in culvert will be.