该方法基于通过测量位于标准压力下的桩表面平面和位于标准荷载下的背衬表面平面之间的距离来确定。该方法和ISO 1766的方法可能不会给出相同的结果。如果存在争议或需要最大精度，厚度应按照ISO 1766的方法确定。

The method is based on determination by measuring the distance between the planes of the pile surface located under a standard pressure and the plane of the backing surface located under a standard loading. This method and that of ISO 1766 may not give identical results. In case of dispute or where maximum accuracy is required, thickness shall be determined by the method of ISO 1766.