堆石料级配缩尺方法对其室内试验结果的影响

Effect of grading scale method on results of laboratory tests on rockfill materials

对同一条现场级配曲线通过缩尺方法缩制成不同的试验模拟级配,进行了密度、力学和渗流特性的对比试验。试验结果显示:全采用等量替代法缩尺后由于小于5 mm含量保持不变,粗、细颗粒充填关系不理想,对应于密度和力学特性最差,渗透系数最大,随着混合法中相似级配法的使用,小于5 mm含量逐渐增加,粗、细颗粒充填关系得到明显改善,缩尺后的密度和力学特性逐渐增加,却带来渗透系数的逐渐减小。目前国内相关规程、规范对级配缩尺方法并没有做具体、明确的规定,有必要通过大量室内和现场对比试验,总结出室内科学的缩尺方法并建立反映缩尺效应的经验公式。

Comparative tests on the density,mechanical and seepage properties of rockfill materials are performed by preparing the same in-situ grading curve as different grading curves based on the scale methods.The test results show that according to the scale by means of the equivalent replacement method,owing to that the content of soil particles less than 5 mm does not change and the filling relation between coarse and fine particles is poor,the corresponding density and mechanical properties are the worst,and the coefficient of permeability is the largest.According to the similar grading method,one of the hybrid methods,the content of soil particles less than 5 mm gradually increases and the filling relation between coarse and fine particles is obviously improved;the relevant density and mechanical properties become larger and larger,however,the coefficient of permeability gradually decreases.At present,there are no specific and definite stipulations for the grading scale methods in Chinese codes and specifications.It is necessary to propose scientific laboratory scale methods for rockfill materials based on large quantity of laboratory and in-situ tests.