Study On Mechanism Of Pile-soil Interaction And Its Engineering Application Of Anti-slide Piles In Accumulation Landslide

With the application of anti-slide pile in landslide control engineering, anti-slide pile used to study the results of landslide governance also with the increase, but there are still many deficiencies. Therefore, considering the influence of many factors effect on anti-slide piles to improve the relevant calculation model has important theoretical significance and practical significance.This paper takes Tea Yang station of Zhanglong railway landslide as the main research object.on the basis of literature review, by theoretical analysis, analysis method of combining the experiment data and numerical simulation,mainly done the following research and achievements are as follows:(1) based on the geotechnical reflect field sampling under laboratory conditions to obtain the parameters of rock and soil body, to ensure its accuracy and to ensure the rigor of parameters required subsequent numerical simulation;(2) Collect data, combined with new and old landslide shape characteristic and boundary conditions to getting the landslide of qualitative and quantitative evaluation: LHP1 stable on the whole, LHP2 ~ basically stable in stable condition, and XHP1 in unstable and unstable state, the recurrence of sliding possibility;(3) through the foundation checking calculation repeatedly, finally determine the anti-slide piles and pile spacing. According to the upper and lower limits of anti-slide pile and conditions for anti-slide pile reinforcement calculation, ensure the anti-slide pile reinforcement within economic reinforcement ratio, maximum possible on the basis of safe more economy;(4) combined with instance is used to numerically simulate three-dimensional analysis, under the condition of different rainfall on landslide- anti-slide pile system of pore pressure and displacement and to evaluate the effect of earthwork, the results showed that:(1)after the rainfall infiltration of pore pressure distribution as the initial pore pressure distribution has obvious distinction, in addition, in the process of rainfall, the unsaturated soil will be from the change of negative pressure zone to the positive pressure area, as to a certain degree of landslide geological disaster will happen at any time;(2)with the rainfall infiltration, the pore pressure increase in geotechnical engineering, make the effective stress decreases in landslide horizontal displacement due to the influence of gravity. At the same time, in the practical geotechnical experience appear certain expansion phenomenon, mainly because the rain lead to increase of the saturation of slope and geological suction is reduced, the effective stress decreases thus appeared the unloading rebound phenomenon;(3)with the rainfall infiltration, pore pressure, saturation with increasing, the shear strength of rock and soil body as a result of effective stress decreases the soil arch effect is abate, within the scope of the space, the influence of the soil arch effect will increase with the depth of the landslide mass and decreases.