Algorithm and Experimental of the Separated Foundation Bearing Capacity of Culverts Considering Lateral Fill

Wang Lei
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Abstract

Combining with the stress characteristics of the foundation soil,the soil force was analyzed for finding the improved effect on the separated foundation bearing capacity of lateral fill.Establishing the calculation model and algorithm,the general formulation of separated foundation bearing capacity considering lateral fill was deduced.Then under direction of similarity theory,five model tests were designed to simulate the foundation deformation of silty clay in whole loading process.The pressure-settlement curves were drew and the foundation bearing capacity under lateral fill height of 0 m,4 m,8 m,12 m,16 m were measured.Test results showed that with the fill height increasing the bearing capacity increased significantly,it had been reached 885 kPa when the fill height was 12 m.But the growth was nonlinear,it firstly increased from 18.42% to 36.11% and then reduced to 3.39%.At last the bearing capacity reached 915 kPa while fill height reached 16m.Meanwhile the errors between the calculated results and measured by model test were almost less than 10%,so the algorithm was feasible.The conclusion is that the lateral fill is advantageous for improve the foundation bearing capacity and reduce project cost significantly when the settlement of the culverts foundation satisfied the design request,with the lateral fill increasing,the rate of the improvement first increases and then decreases,at last it tends to 915 kPa when fill height reached 16 m.
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考虑侧填的涵洞分离地基承载力算法及试验研究
结合地基土的应力特性,对土力进行分析,寻找侧向填土对分离地基承载力的改善效果。建立了计算模型和算法,推导了考虑侧向填土的分离地基承载力的一般公式。在相似理论的指导下,设计了5个模型试验来模拟粉质粘土地基在整个加载过程中的变形。绘制了压力沉降曲线,测量了0 m、4 m、8 m、12 m、16 m侧填高度下的地基承载力。试验结果表明,随着填土高度的增加,承载力显著增加,当填土高度为12 m时,承载力达到885 kPa。但增长是非线性的,先从18.42%上升到36.11%,再下降到3.39%。最终承载力达到915 kPa,填土高度达到16m。同时,计算结果与模型试验结果的误差几乎小于10%,表明该算法是可行的。结果表明:当涵洞基础沉降满足设计要求时,侧填有利于提高地基承载力,显著降低工程造价,随着侧填量的增加,改善幅度先增大后减小,当填高达到16 m时,改善幅度趋于915 kPa。
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