Consideration of the Pile-Soil Friction for Earth Pressure of Limited Soil for Double-Row Piles

摘要

The soil between the front-row pile and the back-row pile is defined as the limited soil in the structure of the double-row pile. However, the Rankine theory is inappropriate for analyzing the properties of the limited soil. Considering the tangential friction of pile-soil for the double-row pile, this paper develops formula of earth pressure of limited soil when it was in limited equilibrium state. The simplified formula of earth pressure intensity of limited soil is also founded. The analysis shows that the result stemmed from the formula equals to that of numerical simulation (FLAC3D). Therefore, the formula of limited soil is reasonable and valuable. The values of earth pressure intensity of limited soil are the same among different width (2d-5d). They are less than that of positive earth pressure. The value of earth pressure intensity at the lower level of the limited soil is far more less than that of positive earth pressure.