Monitoring and Prediction of Settlement in Large Diameter Slurry Shield Tunnels in Water-Rich Sand Layers

Author:

Zhang Hongxing

Abstract

AbstractA major goal of the research is to find solutions to the problems caused by the unique geological features of the Large Diameter slurry shield as it tunnels through a water-rich sand stratum with sandy gravel layers. In order to improve the building process under comparable engineering conditions, the research intends to develop and test novel mud improvers as well as soil improvement methods. The investigation entails performing laboratory tests utilizing various compounds, such as xanthan gum, guar gum, and clay medium particulates, in conjunction with bentonite as the base mud. The researchers determined the optimal slurry preparation scheme by conducting tests which consists of 1% clay particles, 4% bentonite, 0.2% xanthan gum, and 0.04% soda ash. This combination is found to yield the best performance in enhancing the properties of the slurry used in tunneling, and the study concludes that xanthan gum is the most effective additive for improving slurry performance. The research provides guidance on the ideal ratio of new mud to be added to various soil types.

Publisher

Springer Nature Singapore

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