义乌某工程非饱和土水特征曲线强度公式预测

Prediction of unsaturated soil-water characteristic curve strength formula for a project in Yiwu

通过义乌某江东污水处理厂基坑工程的原状土和重塑土的土水特征曲线脱湿试验及原状土非饱和直剪试验,研究分析该非饱和原状土与重塑土在脱湿状态下土水特征曲线特征,进而对脱湿情况下的曲线进行拟合。同时,对该土两种曲线进行强度公式的预测,并用非饱和原状样直剪试验数据,对预测公式进行对比分析及误差分析。分析结果,原状土样的预测公式与剪切实验实测数据比较接近,说明非饱和土原状土样土水特征曲线具有实际研究的意义。此外,还分析了形成的原因和机理,确定适合该土的强度公式,为本地区类似具有类似土的工程提供借鉴。

Through the soil-water characteristic curve dehumidification test and unsaturated direct shear test of unsaturated undisturbed soil and reshaped soil in the foundation pit project of a Jiangdong sewage treatment plant in Yiwu,the soil-water characteristic curve characteristics of the unsaturated undisturbed soil and reshaped soil under dehumidification state were studied and analyzed,and then the curve under dehumidification condition was fitted.At the same time,the strength formulas of the two curves of the soil are predicted,and the prediction formulas are compared and analyzed with the direct shear test data of unsaturated intact samples.The results show that the prediction formula of undisturbed soil sample is close to the measured data of shear experiment,which indicates that the soil-water characteristic curve of undisturbed soil sample of unsaturated soil has practical significance.In addition,the reason and mechanism of formation are analyzed,and the strength formula suitable for this soil is determined,which can provide reference for similar projects in this area.