基于三轴试验的水-土压力计算

The calculation of soil-water pressure based on triaxial Test

支挡结构物设计时水-土压力的计算方法一直存在争议,分算方法理论机理明确,但孔压难以实测,合算方法适应某些工况,但机理不明。针对运营期内支挡结构物后填土表面短时间施加临时荷载的特殊工况,根据室内三轴UU试验和CU试验间内在联系,提出了通过CU强度包线判定不排水条件下土体所处状态的方法,利用CU强度包线得出骤加荷载时主应力和超孔压计算公式,为特殊工况下支挡结构物上水-土压力计算提供一种新的探讨思路。

There has been controversy on the calculation method of soil - water pressure in the design of the supporting structure. There are two methods to calculate soil - water pressure, soil - water pressure calculated separately and soil -water pressure calculated jointly. The theoretical mechanism of the former is very clear and definite, but pore pressure is difficult to measure. The latter can be suitably applied to some engineering, but the theoretical mechanism is not clear and definite. There is a special condition in retaining structures during operation period, temporary load is imposed on the surface of the soil. For the special condition, according to the CU strength envelope the method of determining the soil＇ s state under the condition of undrained condition. It is based on the intrinsic connection between unconsolidated undrained triaxial tests and consolidated undrained triaxial tests. The principal stress and the excess pore pressure are calculated which are coursed by the increase of load, it is based on the CU strength envelope. A new approach is provided on the calculation of soil - water pressure for retaining structures under special conditions.