砂性土静止土压力计算探讨

关于静止土压力,在《铁路工程设计技术手册:路基》和《建筑边坡工程技术规范》(GB50330—2002)中,都有相关的办法和计算,但都是以"经验"为依据提出来的,且其计算图示为墙背垂直填土为水平的情况,由此可见前述规范中采用的方法和公式适用性较小,甚至不准确。基于库伦主动土压力计算理论,结合土体极限稳定边坡的条件,得出可能产生砂性土静止土压力的计算范围,从而建立砂性土静止土压力的计算公式,并通过应力圆加以论证。

Discussion for Calculation of Static Earth Pressure of Sandy Soil

For the static earth pressure, relevant method and calculation are provided in both “Technical Manuals for Railway Engineering Design:Subgrade” and GB50330—2002 “Technical Code for Building Slope Engineering” according to “experiences”, and the related calculation shows the horizontal condition of vertical filling of the back wall, so the method and formulas provided in the above specifications have low applicability, and even are not accurate. In this paper, based on Coulomb’s computing theory about active earth pressure and the combination of the extreme stability condition of soil slope, the potential calculation range of the static earth pressure is obtained for sandy soil to establish the calculation formula for static earth pressure of sandy soil.