岩石边坡中滑动面水压分布假设的改进

在使用极限平衡法计算岩体边坡平面滑动时，一直沿用HoekE和Bray Jw提出的假设来计算滑动面上的静水压力，即当滑体有竖直张裂缝时，假定竖直张裂缝底部的压力最大，在张裂缝中向上逐渐变小．但这种情况下的水压变化假设存在一定问题．本针对这个问题提出了一种新的水压变化假设，即在滑面的最低点和张裂缝中水位点的水压为0；无论总水位的1／2处在张裂缝中还是在滑动面上，水压力都在该点达到最大．使用这种新的假设将使充水岩石边坡稳定性分析更具科学性．

Improving on Assumption for Water Pressure Distributing on Failure Surface in Rock Slope

For calculating the safety factor of a rock slope, the assumption suggested by Hoek E and Bray J W is adopted to calculate the normal force on failure surface. The assumption means that while a rock slope with tesnsion crack, the water pressure is maximum at the bottom of the tension, then it decreases gradually up the crack. In this case, this assumption is problematic. Therefore, a new assumption is put forward for the change of water pressure. The new assumption presents a point that the water pressure is zero at the lowest point of the failure surface and the water level in the tension crack. By means of this new assumption the analysis of the stability of watered rock slope can be more reasonable.