Prediction of Disc Cutter Life during Shield Tunneling with AI via the Incorporation of a Genetic Algorithm into a GMDH-Type Neural Network

Real-time prediction of shield moving trajectory during tunnelling

Statistical analysis of major tunnel construction accidents in China from 2010 to 2020

When pumping is conducted in confined aquifer inside excavation pit (waterproof curtain), the direction of the groundwater seepage outside the excavation changes from horizontal to vertical owing to the existence of the curtain barrier. There is no analytical calculation method for the groundwater head distribution induced by dewatering inside excavation. This paper first analyses the mechanism of the blocking effects from a close barrier in confined aquifer. Then, a simple equation based on analytical solution is proposed to calculate groundwater heads inside and outside of the excavation pit with waterproof curtain (hereafter refer to close barrier) in a confined aquifer. The distribution of groundwater head is derived according to two conditions: (i) pumping with a constant water head, and (ii) pumping with a constant flow rate. The proposed calculation equation is verified by both numerical simulation and experimental results. The comparisons demonstrate that the proposed model can be applied in engineering practice of excavation.

Calculation of groundwater head distribution with a close barrier during excavation dewatering in confined aquifer

Investigation on performance of a large circular pit-in-pit excavation in clay-gravel-cobble mixed strata

This paper introduces thirteen kinds of typical excavation failures widely encountered in practice in China along with corresponding failure mechanisms and damages to adjacent structures an...

Longitudinal Sliding Event during Excavation of Feng-Qi Station of Hangzhou Metro Line 1: Postfailure Investigation

Distinct from shield tunnelling in clayey and sandy strata, crushing undetected single isolated boulder by tunnelling machine frequently resulted in severe ground subsidence hazards (e.g., cave-in of ground). These ground subsidence usually happened suddenly with little warning, occurred few hours to few years post-tunnelling, and did not feature a continuous settlement trough curve like those of tunnelling in fine grained soils. In light of these, it is extremely difficult to predict potential ground subsidence hazards and then to adopt appropriate countermeasures or post-tunnelling remedial measures to prevent associated damages. By applying a systematic methodology that can randomly yield close approximation of morphology of rock blocks into commercial particle flow code PFC2D, the influence of boulder location on ground settlements, overburden pressures, and bending moments in the tunnel lining was investigated. The numerical simulations disclosed that the shape of ground settlements trough reflected the location of crushed boulder. In the meantime, crushing and removing the boulder would change earth pressure around the tunnel and thus caused the bending moments in the lining to redistribute.

Numerical Study on Ground Subsidence Due to Crushing Single Isolated Boulder by Tunnelling

Optimization of enrichment and pretreatment of low-activity radium isotopes in the open ocean

To date, why a 13-story building in Shanghai fell abruptly to the ground in 2009 remains uncertain. By review of physical evidence, limit-equilibrium analyses, extensive calculations, and t...

https://ascelibrary.org/doi/pdf/10.1061/%28ASCE%29GT.1943-5606.0002264

Forensic Geotechnical Analyses on the 2009 Building-Overturning Accident in Shanghai, China: Beyond Common Recognitions

Corrigendum to “Heavy rainfall-related excavation failures in China during 1994 to 2018: An overview” [Eng. Failure Anal. 129 (2021) 1–15/105695]

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