tunnelling through cities underlain by soft soil, commonly associated with soil movement around the tunnels and subsequent surface settlement. the predication of ground movement during the tunnelling and optimum support pressure could be based on analytical, empirical or the numerical methods. the commonly used earth pressure balance (epb) tunneling machines, uses the excavated soil in a pressu...

Rock mass conditions are extremely sensitive to tunnel boring machine (TBM) tunneling. Therefore, establishing a surrounding rock excavatability (SRE) classification system applicable TBM tunnels. Accurately and intelligently identifying grades can also facilitate efficient tunneling intelligent construction. Specific excavation penetration rates were used evaluate SRE. Their correlations with ...

The development of underground spaces in urban centers has attracted significant research attention. Typical excavation methods for areas include the New Austrian tunneling method (NATM) and tunnel boring machine (TBM). NATM is superior terms ease construction economic efficiency; however, vibration noise are often cited as major complaints. In addition to their high initial cost, TBMs require ...

In contrast to straight tunnels, the mechanisms of displacement surrounding soil induced by shield excavation small radius curved tunnels are more complex. Based on field monitoring data surface settlement and horizontal a tunnel in section Zhengzhou Metro Line 3, numerical model using three-dimensional finite element method is established evaluate factors soil. The results verify validity simu...

Autonomous localization and operation of tunnel boring machines in perceptually degraded roadways is essential for intelligent upgrading tunneling. Tunneling robots are far less than anticipated owing to the darkness, dust, vibration, geometrically roadways. We presented a multi-engine state estimation method mapping localizing (TBM-MSE). TBM-MSE designed novel inertial enhancement model that m...

Geologic uncertainty in underground construction promotes design and construction conservatism and has a significant effect on project cost. Site investigation can reduce this uncertainty and decrease costs by reducing the contingency amounts included in bids. This paper presents research findings that provide a better understanding of how subsurface exploration and improved contractual risk sh...

The construction of tunnels involves massive excavation work and generates an enormous amount waste slag. improper disposal the slag may cause environmental pollution. treatment is usually costly. In this study, feasibility recycling as a component in synchronous grouting material was investigated. A series experimental measurements were conducted to evaluate performance with different proporti...

Finite element technique is used to model two phases of tunneling process, namely; excavation and rocklining interaction. The excavation phase is responsible for determining the pre-lining rock mass deformations and the reduced in-situ stresses. The interaction phase models the compatibility of the rock-lining system. The deformations and stresses of the rock-lining system and the final rock ma...