确定斜坡地基比例系数m值的模型试验研究

为研究斜坡坡度及水平荷载作用角度对斜坡地基比例系数m值的影响，设计并完成了一系列斜坡地基刚性桩水平承载室内模型试验，测得了不同斜坡坡度及水平荷载作用角度下地基比例系数m值.试验发现：斜坡地基比例系数m值随地面处桩身水平位移x、斜坡坡度α及水平荷载作用角度β增加呈非线性减小，当x>10 mm时，m值几乎保持为一定值，并据此建立了斜坡地基比例系数m值与坡度α及荷载作用角度β之间的拟合关系式.理论与试验对比分析表明：根据考虑斜坡空间效应影响确定的斜坡地基比例系数m值，计算得到的桩身内力、位移与实测结果最接近，最大计算误差小于10%；斜坡桩基设计时，建议取地面处桩身水平位移x=10 mm对应的m值.
To examine the influence of slope angles and horizontal loading angles on the foundation proportional coefficient m in slope grounds，model tests of in-slope steel piles were designed and implemented，and the m-values under different slope angles and horizontal loading angles were then obtained.Model tests revealed that the m-value decreased nonlinearly with the increase of the slope angle α，horizontal loading angle β and lateral displacement x of piles at the ground surface.The m-value almost kept the same when the value of x was more than 10 mm.Moreover，the relationship among m-value and slope angle α and horizontal loading angle β was established.The contrastive analysis showed that the theoretical calculation result under the consideration of the slope space effect when determining the m-value was close to the test result，and the maximum error was no more than 10%.It is suggested to adopt the m-value when the value of x is 10 mm for the design of in-slope piles.