Large scale land reclamation and the effects on hydro-mechanical behavior in loess and loess-derived fill

Lan, Hengxing; Zhang, Tongwei; Peng, Jianbing; Zhang, Fanyu; Li, Langping; Wu, Yuming; Tian, Naiman; Clague, John J.

doi:10.1016/j.enggeo.2023.107241

Cited by 6 publications

(1 citation statement)

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“…Therefore, the lower water content of loess is more conducive to the stability of the surrounding rock. However, adjusting the water content of the surrounding rock too low by precipitation measures not only destroys the ecological environment but also makes it easier for water molecules in the surrounding high-moisture loess strata to reincrease the water content of the surrounding rock through the seepage channel [44,45]. In summary, this article proposes a water content threshold and reinforces the loess surrounding rock on the basis of the water content threshold.…”

Section: Discussionmentioning

confidence: 93%

Stability Assessment of Tunnels Excavated in Loess with the Presence of Groundwater—A Case Study

Deng,

Zhang,

et al. 2024

Water

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The high water content of the surrounding rock in loess tunnels will lead to the deterioration of rock strength, causing deformation and damage to the initial support structure and thereby affecting safety during construction and operation. This article first analyzes the strength characteristics of loess under different water contents through indoor physical and mechanical tests. Secondly, based on numerical simulation results, the ecological environment, and design requirements, the water content threshold is determined. Finally, a reinforcement scheme combining surface precipitation measures and curtain grouting measures is proposed, and the reinforcement effect is analyzed based on on-site monitoring data. The results show that as the water content of loess increases, the cohesion, internal friction angle, and elastic modulus of the surrounding rock all decrease, leading to an increase in the sensitivity of the surrounding rock to excavation disturbances and a deterioration in strength. During the construction process, it shows an increase in the vault settlement and sidewalls’ convergence. During the process of increasing the distance between the monitoring section and the palm face, the settlement and convergence of the tunnel show a rapid growth stage, slow growth stage, and stable stage. The water content threshold is determined to be 22%. The reinforcement scheme of combining surface precipitation measures with curtain grouting measures not only meets the requirements of the ecological environment but also makes the settlement and convergence values lower than the yellow warning deformation values required by the design.

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Section: Discussionmentioning

confidence: 93%