Calculation method of foundation bearing capacity based on division in loess area for highway engineering
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摘要: 公路黄土地基承载力的评价主要借鉴建筑、铁路等行业的评价经验, 以整个黄土地区为单元, 给出一个推荐公式或承载力表, 已不能满足公路工程的要求。以大量黄土地区实测载荷试验为基础, 按照承载力把黄土地区分为四个区, 每个区都建立了承载力与含水量、液限、孔隙比之间的非线性回归关系式。用这一套回归关系式确定的黄土承载力相对误差小于10%, 与规范方法相比较, 精度显著提高。同时对承载力分别按路基的宽度、相对变形以及刚柔荷载进行修正, 给出了承载力设计值的修正公式。Abstract: The foundation bearing capacity evaluation of highway engineering in loess area mainly relies on the evaluation standards of architecture, railway and other similar fields, they only provide a formula or bearing capacity table based on whole loess area, which can not meet the needs of highway engineering. Based on analyzing the data of actual plate loading test, the loess areas were divided into four sections according to their bearing capacities, the nonlinear regression relationship formulas were established between loess foundation bearing capacities and water content, liquid limit, void ratio. Applied result shows that the relative errors of the bearing capacities computed by the formulas are less than 10%, compared with other standard methods, the formulas are feasible. Meanwhile, the formulas are revised according to the width, relative distortion, rigidity and flexibility of subgrade.
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图 2 承载力与含水量和孔隙比的关系
Figure 2. Relations of foundation bearing capacity and water content, void ratio
表 3 载荷试验资料分布
Table 3. Data distribution of plate loading test
地点 青海省 甘肃省 陕西省 山西省 河南省 资料份数 30 35 102 70 20 
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表 8 容许沉降回归关系式
Table 8. Regression formulas of confessional sedimentation
公路等级 回归关系式 高速、一级公路 S容= (-0.001 2E+0.533 8) e0.066 9h 二级公路 S容= (-0.002 1E+0.710 3) e0.066 9h
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