竖井衬砌主动土压力在一般环向压应力系数下的简化滑移线解(英文)

Active earth pressure on circular shaft lining obtained by simplified slip line solution with general tangential stress coefficient

引进一个广义环向压应力系数来修正空间轴对称滑移线问题中的哈尔-卡门(Haar-Von Karman)完全塑性假定, 采用简化滑移线方法, 在竖井衬砌后背光滑,水平填土的条件下,得到竖井衬砌上主动土压力的解析式。分析表明:环向压应力系数对竖井衬砌上的主动土压力有较大的影晌,若采用哈尔-卡门完全塑性假定,其所求得的主动土压力最小,在工程应用中偏于危险。笔者建议在工程应用中采用环向压应力系数为静止土压力系数 K0时所求得的竖井衬砌上的主动土压力值。

In this paper, a general tangential stress coefficient is introduced to overcome the limitations of the Haar & Von Karman hypothesis in axi-symmetric earth pressure problem. A simplified analytical solution of active earth pressure on circular shaft with no wall friction and horizontal backfill is developed in the present paper. It is demonstrated that the tangential stress coefficient has a major effect on the active pressure and the Harr & Von Karman hypothesis may be unacceptable in practice. The authors consider that an active earth pressure based on a tangential stress coefficient equal to the coefficient of earth pressure at rest is suitable for engineering practice.