侧填荷载对涵洞地基承载力影响分析.docVIP

侧填荷载对涵洞地基承载力影响分析 　　摘要：本文主要探讨涵侧填土对涵洞地基承载力的作用。具体是结合基底土体的受力特征和情况，对普朗特尔与普朗特尔雷斯诺的极限承载力公式进行了推导，然后根据结论设计不同涵侧填土高度的室内模型试验。该实验过程模拟了质粘土的地基承受荷载而变形一直到被损坏。从荷载-沉降曲线测量到不同填土高度的极限承载力，并且分析了填土临界的高度问题，与此同时对比了《建筑地基基础设计规范》和《公路桥涵地基与基础设计规范》，加上参照经验公式的计算值以及实际测量数值的误差，得出如下结果：增加侧填土高度会显著提高地基的承载力，但是其提高的速率是非线性，一般是由18. 4%提升到36. 83%，然后再降回8. 91% ；对临界高度内的地基承载力进行计算时，不但要考虑选择适合的计算公式，同时也需要考虑不同的试验方法所得出的计算参数的影响。 　　关键词：道路工程；高填方涵洞；室内模型试验；侧向填土；临界高度；地基承载力 　　Abstract: this paper mainly discusses the filled soil contain the side of the bearing capacity of foundation soil culverts role. Concrete is a combination of soil base force characteristic and status, especially for perlongs, grace, and perlongs ultimate bearing capacity is the formula, and then based on the conclusion different design side of the height of the filled soil contain the indoor model test. The experimental process simulation of the foundation of the clay bear loads and deformation has been to be damaged. From the load-settlement curve measurement to different filling height limit bearing capacity, and analyzes the filling the height of the critical problem, meanwhile compared the code for design of building foundation and the highway bridge foundation and fundamental design specification of, plus experience formula with reference to the calculated value of measurement error and the actual value, it is concluded that the following results: increase side filling height will significantly improve the bearing capacity of the foundation, but the rate of increase is nonlinear, general is by 18. 4% increase to 36. 83%, and then fall back to 8. 91%; On the critical height foundation bearing capacity in the calculation, not only should consider to choose suitable calculation formula, also need to consider different from the test method of calculating the effects of parameters. 　　Keywords: road engineering; High fill tunnels; Indoor model test; Lateral filling; The critical height; Foundation bearing capacity 　　 　　 　　中图分类号：TU4文献标识码：A 文章编号： 　　1.前言