Abstract
Taking the ground settlement while pipe-jacking construction in soft soil as the engineering background, the effect of pipe jacking were studied by numerical simulation. It focused on the factors that mainly influenced surface settlement of ground including in-situ stress release rate (or ground loss ratio), chamber pressure, elastic modulus of soil, buried depth and diameter of pipe. That would provide theoretical basis for taking measures to reduce surface subsidence while jacking. The main conclusions were as follows: (1) The in-situ stress release rate and pipe diameter were proportional to the surface subsidence. (2) Chamber pressure, elastic modulus and buried depth were inverse proportional to the surface subsidence. (3) From the point of view of the influence on surface settlement, the sensitivity of pipe diameter and elastic modulus of soil was the greatest, followed by burial depth and chamber pressure, and the stress release rate was the smallest.
Highlights
In pipe-jacking construction, there are three commonly used equilibrium theories: air pressure balance, sludge balance and earth pressure balance
That is that while the burial depth increases by 3.0 times, the settlement decreases by 34.7%. (3) When the burial depth of pipe jacking is smaller, the lateral surface settlement decreases by 34.7%; (4) When the burial depth of pipe jacking is small, the settlement trough become narrow and deep
(2) When the pipe diameter increases by 3 times, the surface subsidence almost increases by 6 times
Summary
In pipe-jacking construction, there are three commonly used equilibrium theories: air pressure balance, sludge balance and earth pressure balance. One is that water and earth pressure applied to working face should be kept in balanced state during jacking Another is that amount of excavation and output of soil should be in equilibrium state. Relevant scholars have done some research on disturbance mechanism on surrounding soil, influencing factors and control technology on ground settlement during jacking. The main factors affecting surface settlement, such as ground loss ratio, chamber pressure, buried depth of pipe-jacking, elastic modulus of soil and pipe diameter, are selected to carry out the sensitivity analysis on ground settlement during pipe-jacking construction in soft clay layer. That would provide a basis for taking measures to reduce surface settlement
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