硬壳层对软土地基变形规律的研究

对浙江７７省道延伸线工程填筑期的沉降进行监测分析，由填高—沉降量曲线，推算出路基的临 界高度，分析硬壳层对临界高度、路基沉降的影响规律，并用双曲线法预测了工后沉降。结果表明，硬壳 层能明显减小路基的沉降、不均匀沉降，提高路基临界高度。当路基高度小于临界高度时，可对地基不 做处理。结合该工程实际，验证了结论的正确性，可为类似工程提供参考。

Study on Influencing Regularity of Hard Crust to Soft Ground Deformation

Through monitoring the filling period＇s settlement of the extension line of the 77th provincial highway in Zhe- jiang, and by using filling height--settlement curves, the critical height of the rode section is calculated, the influencing law of the hard crust to the critical height and subgrade settlement is analyzed, and the settlement after construction is forecasted by hyperbola method. The results show that the hard crust can remarkably decrease the subgrade settlement and asymmetric settlement, and increase the critical height. Taking into account the effect of hard crust, when the subgrade height is less than the critical height, the foundation cannot be treated. At last, the correctness of the conclusions as mentioned above is validated with the engineering practice, which could provide some references for similar projects.