基于含石率与最大干密度关系曲线测定路基压实度的应用技术研究

工程实践研究表明,在路基压实过程中,准确测定最大干密度值是确保路基压实质量的前提。然而现场路基填料经常呈现不均匀分布,含石量变化较大,使得现场测定的压实度值异常,从而影响路基压实质量。为了准确测定由填料含石量变化造成的压实度检测误差,当路基填筑材料含石率变化较大时,需对该批土料进行筛分检测,通过标准击实试验试配不同含石率下对应的最大干密度。通过散步图观察不同含石率下对应的最大干密度,使用数学或其他方法建立对应的回归曲线方程,并绘制回归图;根据现场测得的土样含石率从回归曲线中找到或通过回归方程计算最大干密度,再根据现场测定的干密度计算测点的压实度值,从而决定是否修改相关参数,以满足路基设计要求。

Research on Application Technology of Determining Subgrade Compactness Based on Relation Curve of Rock Content and Maximum Dry Density

Engineering practice shows that in the process of subgrade compaction, accurate determination of the maximum dry density is the premise to ensure the quality of subgrade compaction. However, the field subgrade filling often presents uneven distribution, and the stone content changes greatly, which makes the field measured compaction degree abnormal, thus affecting the quality of subgrade compaction. In order to accurately determine the detection error of compactness caused by the change of stone content of filling materials, when the stone content of subgrade filling materials changes greatly, it is necessary to screen and detect the batch of soil materials, and test the corresponding maximum dry density under different stone content through standard compaction test. The maximum dry density under different stone content was observed by walking chart, and the regression curve equation was established by mathematical or other methods, and the regression diagram was drawn. The maximum dry density can be found from the regression curve or calculated by the regression equation according to the stone content of the soil sample measured in the field, and then the compactness value of the measuring point can be calculated according to the dry density measured in the field, so as to decide whether to modify the relevant parameters to meet the requirements of the subgrade design.