再论有效应力原理与饱和土静止侧压力计算

On the Principle of Effective Stress and the Calculation of Static Lateral Pressure of Saturated Soil

笔者引入饱和土给水度参数计算出自由水通道面积,依据绝对水平截面力平衡原理,推导出竖直水土压力计算公式(新有效应力原理)。通过饱和土土骨架受力分析和水土侧压力特点,首次提出饱和土静止侧压力统一计算新公式σ侧=k 0σ′+ku_(水)+(1-k)μu_(水),并提出自由水作用力在土颗粒中的传递率概念。当传递率为1时就是太沙基有效应力原理的水土分算公式,当给水度为0时就是现今的水土合算计算公式。饱和土静止侧压力计算新公式从理论上分析出水土分算与水土合算的正确性。希望能对理论土力学的发展和饱和土静止侧压力计算有所帮助。

The author introduces the water yield parameter of saturated soil to calculate the area of free water channel,and deduces the calculation formula of vertical water and soil pressure(new effective stress principle)based on the principle of absolute horizontal section force balance.Based on the stress analysis of saturated soil skeleton and the characteristics of water and soil lateral pressure,a new unified calculation formula of static lateral pressure of saturated soil is proposed for the first time,and the concept of transmission rate of free water force in soil particles is proposed.When the transfer rate is 1,it is the water and soil calculation formula of Terzaghi effective stress principle,and when the water yield is 0,it is the current water and soil calculation formula.The new formula for calculating the static lateral pressure of saturated soil theoretically analyzes the correctness of the separate calculation of water and soil and the combined calculation of water and soil.It is hoped that it can be helpful to the development of theoretical soil mechanics and the calculation of static lateral pressure of saturated soil.