Research on theoretical solution of internal forces and wall thickness of micro pipe jacking steel shaft
This article focuses on the background and trend of the increasing application of micro pipe jacking,in order to achieve quantitative design and scientific construction of steel shaft,and to study the theoretical solution of internal forces in steel shaft.The external force acting on the steel shaft is decomposed into two parts:the soil reaction force during jack-ing and the active earth pressure.The magnitude and distribution of the soil reaction force obtained from numerical simula-tion are analyzed.Drawing on the experience of reinforced concrete caisson,the theoretical solution for the internal force of the steel shaft is summarized,and the influencing factors of the steel shaft wall thickness are discussed.The results show that the soil reaction force acting on the steel shaft is distributed horizontally according to a cosine function and verti-cally according to an exponential distribution,and the distribution state is related to the characteristics of the geological layer in which it is located;The required wall thickness of the steel shaft is positively correlated with the jacking force,in-ner diameter of the steel shaft,and burial depth,and negatively correlated with the m value of soil;The wall thickness of the steel shaft can be controlled within a reasonable range by reinforcing the backrest soil or using thixotropic mud to re-duce the jacking force.
万方数据
维普
