哈尔滨高等级公路路基沉降监测反分析

Back-Analysis of Settlement Monitoring of Foundation in Harbin Expressway

本文应用双曲线配合法对哈尔滨高等级公路路基实测沉降进行了分析,推算了地基的最终沉降量,并由此用太沙基方法反算出地基中粘土层的平均固结系数和渗透系数。把用本文方法推算的渗透系数应用于太沙基方法计算路基沉降,发现比选用实验室测得的渗透系数计算的结果更接近实际沉降。通过本次反分析研究得出:路基中粘性土的固结系数和渗透系数明显高于室内土工试验测得值。这给相似地基高等级公路的设计、施工提供了参考依据。

Measured settlement of foundation in Harbin expressway was analyzed with hyperbolic matching method in this paper. The final settlement of the soft foundation was calculated. The mean consolidation coefficient and mean permeability coefficient of clay blankets of the foundation were accounted inversely with TERZAGHI method. Both of this way and the test way are used to work out permeability coefficient in the TERZAGHI method. The result of the former approach is closer to the settlement fact. From the back-analysis of this pro ject, we have concluded that the consolidation coefficient and permeability coefficient of clay blankets of the foundation are obviously greater than those of indoor soil mechanical test. This way would be helpful to similar design and execution of the foundation under expressway.