Seismic Stability of Loess Tunnel with Rainfall Seepage

Abstract

Rainfall seepage changes the mechanical properties of loess masses. Considering fluid-solid coupling, the calculation model of a loess tunnel is established according to the finite element method (FEM). Based on porous media seepage theory and rainfall infiltration depth theory and considering the infiltrated depth of the loess surface for different rainfall intensities over a certain period, the stability of a loess tunnel under different rainfall amounts and loess cover thicknesses is studied using the dynamic finite element static strength reduction method. The results show that under the same rainfall intensity, the safety factor increases with the depth of the tunnel; the safety factor of the loess tunnel with the same loess cover thickness decreases with increasing infiltration depth. The plastic strain is mainly distributed on both sides of the vault and the arch feet. The stability of the loess tunnel is directly related to the loess cover thickness and rainfall seepage.

Enhanced Earth and Rockfill Dam Seepage Forecasting via an Integrated PLS-BO-BiLSTM Approach: A Novel Model Incorporating Lag Effects and Optimization Algorithms

“…In the seepage monitoring of earth and rockfill dam, models grounded in numerical simulations as well as those derived from actual monitoring data are both pivotal for the stability warning of earth and rockfill dam seepage.Numerous studies have employed numerical techniques to explore the dynamics of precipitation infiltration in slopes (Johari and Talebi, 2019;Cheng et al, 2020b;Tian et al, 2017;Leshchinsky et al, 2015;Xu et al, 2005;Moayedi et al, 2011). These studies highlight that the outcomes of such calculations are highly dependent on the chosen models and parameters, often resulting in extensive computation times.…”