平推式滑坡启动判据的修正

对平推式滑坡启动判据的传统研究往往忽略滑块后缘的静水压力沿滑面法向的分力及承压水作用的具体范围，因而导致计算结果不准确。通过对平推式滑坡进行全面的受力分析，同时引入了承压水作用范围的概念，最终推导出修正后的平推式滑坡启动判据公式。将所得的修正判据应用于模型试验的结果分析，发现修正方法计算结果比传统方法大6.0%～15.5%，更加接近于试验观测值，验证了修正判据的准确性。同时对平推式滑坡启动临界水头的模型试验结果和修正计算值之间的差异进行了机理分析：当边坡模型滑动面倾角小于等于8°时，渗流的时滞性和渗透层的不均匀性导致启动临界水头实测值大于修正计算结果；当倾角大于8°时，模型稳定性随试验时间增加而逐步降低，导致启动临界水头实测值小于修正计算结果。

Modification of the Start-Up Criterion of Translational Gliding Landslide

Two aspects are always neglected in the existing research about start-up criterion of translational gliding landslide：one is the normal component force of hydrostatic pressure at posterior border of slope，which acts on slip surface，the other is the action range of confined water. Therefore the calculation results of start-up criterion of translational gliding landslide are inaccurate. Overall force analysis are exerted on translational gliding landslide，meanwhile the conception of action range of confined water is introduced，then the modified start-up criterion is deduced. The modified start-up criterion is applied to analyze the results of physical simulation. It shows that the result of the modified criterion is about 6.0% to 15.5% larger than the traditional criterion and much  close to the observed value. The modified criterion is proved to be accurate. Mechanism analysis is applied in the differences of critical hydraulic between the test results and the calculation results obtained from the modified start-up criterion of translational gliding landslide. When the sliding surface inclination of the model slope is less than or equal to 8 degree，the test results are greater than the calculation results obtained from the modified start-up criterion because of the hysteresis of seepage and the inhomogeneity of permeability layer. When the sliding surface inclination is greater than 8 degree，the test results are less than the calculation results due to decrease of the model stability with increase in test time.