The Research Of Caculation Methods For Lateral Pressure On Shaft Lining And Its Numerical Simulations

:The calculation of the lateral pressure is one of the most important subject in Geotechnical Engineering, the researches on which in the curved retaining wall structure analysis is of great application value. This thesis does a further research on the calculation the lateral pressure of the curved structure such as shaft based on Coulomb earth pressure theories.The traditional limit equilirium theory overlooks the normal forces to the adjacent sides of the micro unite, which based on the studies of the theory about linear retaining wall. For the curved retaining wall such as shaft, the normal force to the adjacent sides of the micro unite has an important impact on the balance of the soil. Based on Coulomb earth pressure theories and the method of Yuan Fang, This thesis take the influence of the curved surface and the adjacent sides of the micro unite on the balance of the soil into consideration. Meanwhile cohes a three-dimensional circular sector soil mass to do force analysis. Under static equilibrium condition, a new formula of shaft lateral pressure is derived.Within the three calculation example, each of them adopts different shaft radius and excavation depth. Based on the combination of numerical simulation analysis, the effective factors of shaft lateral pressure are obtained. Compared with the calculation results of the derived formula, the two results are almost the same, which proved the correctness of the derived formula. The comparison of the lateral pressure results with the different radius, excavation depths and relative stiffness demonstrates that:1. As the impact of the shaft surface effect, the calculation result of shaft lateral pressure in the thesis is smaller than the two classical method. Therefore the classical method is not reasonable for the curved retaining wall structure.2. Different from the conventional earth pressure, the shaft lateral pressure increases as the increase of depth, which performs in a non-linear form.3. The shaft lateral pressure has an effect on radius, which increases as the radius and become a stable value eventually. However, different relative stiffness has a little effect on the shaft lateral pressure.