一种地基土水平抗力系数的比例系数m的计算方法

A method for calculating proportional coefficient of horizontal resistance coefficient of foundation soil

m值法是我国用于计算桩基水平承载力最广泛的方法,m值的取值直接影响桩侧土抗力的准确性,不同性质的土的m值的取值范围存在很大差别,m值的确定方法具有重要的工程应用价值。提出一种通过模型试验实测数据反算地基土m值的方法。基于扩底桩的横向加载模型试验,以云南省典型红黏土做为试验用地基土,先假定一个m值,计算桩在地面处的水平位移,将该值与室内模型试验实测的水平位移进行比较,若两者数值相差较大,则重新假定m值进行计算,直至计算出的位置值与实测值之间的误差在可接受范围之内,则所取的m值即为该级荷载下所对应的地基反力比例系数。结果表明,该方法可以获得较准确的地基土m值。

The m -value method is the most widely used method for calculating the horizontal bearing capacity of pile foundations. The accuracy of soil resistance of pile side is directly affected by m -value.The range of m -values of soils with different properties is very different. The method of determining the m -value has important engineering application value. A method for inversely calculating the m -value of foundation soil by model test data is proposed. Based on the lateral loading model test of the belled pile, the typical red clay in Yunnan Province was used as the test ground soil. The m -value was assumed first, and the horizontal displacement of the pile at the ground was calculated. The value was compared with the horizontal displacement measured by the indoor model test. For comparison, if the difference between the two values is large, the m -value is re-assumed until the calculated error between the calculated position value and the measured value is within the acceptable range, then the m -value is the proportion coefficient of ground reaction under this load. The results show that the accurate m -value of foundation soil can be obtained by this method.