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以均质和层状黄土地基为例就条形荷载下地基沉降的基础尺寸效应问题进行计算研究。在基底压力不变情况下,地基沉降量随着基础宽度的增加呈非线性增加,但随着基础宽度的增加,沉降增量逐渐减小。对上硬下软双层地基,在基底压力和基础宽度一定情况下,基础宽度取值越小,上层厚度变化引起的沉降差异越小,基础宽度越大,宽度增量导致的沉降增量越小。对于上部荷载恒定的条形基础,地基沉降量随着基础宽度的增加呈非线性减小,在基础宽度一定情况下,基础宽度取值越小,双层地基上层厚度变化引起的沉降差异越大,基础宽度较小时地基沉降对其宽度变化较敏感。对于小尺寸基础,采用增大基础宽度减小地基沉降的方法是有效的,但对于大尺寸基础,则不宜采用增大基础宽度减小地基沉降的方法。
Taking the homogeneous and layered loess ground as an example, the basic dimension effect of foundation settlement under strip load is calculated and studied. Under the condition of constant substrate pressure, the settlement of foundation increases nonlinearly with the increase of foundation width, but with the increase of foundation width, the settlement increment decreases gradually. For the upper and the lower soft double foundation, under the condition of the base pressure and the basic width, the smaller the foundation width, the smaller the difference of settlement caused by the change of the upper layer thickness, the bigger the foundation width and the greater the increment of settlement caused by the increment of width small. For the strip foundation with a constant upper load, the settlement of the foundation decreases nonlinearly with the increase of the foundation width. The smaller the foundation width, the greater the difference of settlement caused by the change of the thickness of the upper layer of the double foundation when the foundation width is constant When the foundation width is small, the foundation settlement is more sensitive to the change of its width. For the small size foundation, it is effective to increase the foundation width to reduce the foundation settlement. However, for the large foundation, it is not appropriate to increase the foundation width to reduce the foundation settlement.