The Analyses Of All Possible Effects Of Excavating By PBA Method On Adjacent Existing Bridge Piles And Buried Pipelines And Its Mechanical Mechanism

Tunneling will inevitably result in a loss of ground due to soil deformation and displacement into the opening. The tunneling-induced soil movement and deformation may do damage to the pre-existing structures and underground utilities. It is necessary to predict the ground surface movements and their influence to adjacent utilities so that precautious measures can be taken to protect these utilities from tunneling. A FLAC computational model is established in according to the characteristics of tunneling, and elastic-plastic method is used to research into the influence of the tunneling on ground movement underground utilities and nearly bridge pile, and the main content of this paper as follows:1. Analyse the influence on the ground settlement, the upside pipe and nearly bridge pile of every main excavation steps. Conclude the most influential steps, according to the inspecting require, bring forward embody controlling value of every working procedure.2. Calculate the internal force of the upside pipe and lateral displacement of the bridge pile with the experience formula method. Compare to the result of numerical simulation analysis in order to find reasonable judging criterion and bring forward some safeguards of corresponding risk fountains.3. Comparing to the inspecting results, in the case of corresponding inspecting results, change the main working procedures of the major station. Analyse different influences on the structure with different constructing working procedure and give embody different result to coach practise constructions.