Mining Leachates Effect on the Hydraulic Performance of Geosynthetic Clay Liners under Different Temperatures

Abstract

Geosynthetic clay liners (GCLs) are often used as anti-seepage systems in landfills and at the bottom of tailing ponds. The anti-seepage performance of GCL will change under different temperatures. In this study, bentonite was mixed with test solutions at different temperatures to measure the basic performance indexes of bentonite components and analyze the permeability. The composition and micro-structure of bentonite at different temperatures were analyzed by X-ray diffraction, X-ray fluorescence spectrum, and SEM, and the change rule of permeability property with the mine leachates at different temperatures was understood by combining the macro-measured parameters with the microscopic analysis results. The research results indicate that the fluid loss of two bentonites increased with the increasing temperature due to the inhibition of ion exchange between bentonite and mixture by the increased temperature. The swelling index of the bentonite increased at high temperatures. The micro-structure analysis showed the increase of the pore size attributed to high temperature, and the uneven distribution of the pore size resulted in the increase of the intrinsic permeability. The study would provide the reference for the application of GCL in mining.

The Impurity Removal and Comprehensive Utilization of Phosphogypsum: A Review

“…For the intercrystalline phosphate impurities, Cai et al [74] illustrated that oxalic acid could eliminate part of cocrystalline phosphorus impurities by disrupting a portion of the gypsum crystal structure, resulting in the phosphorus leaching efficiency of 77.7% with the use of 1% oxalic acid. Although this method is easy to operate, it often requires a large amount of solution, which inevitably faces the problem of subsequent leachate treatment [75,76]. In addition, this method only removes surface-adsorbed impurities, with little effect on those encapsulated.…”

Application of High Density Resistivity Method in Karst Exploration: A Case Study

“…The technical principle of seismic exploration is based on the differences of kinematic and dynamic characteristics of seismic wave propagation in stratum interface structure and media with different physical characteristics [21][22][23]. However, seismic exploration is easily affected by strong human interference, and obtaining high-quality data requires explosive sources, which may cause damage to the surrounding environment [24,25]. Geological radar method is a shallow geological advance prediction method, which uses the difference between the length of electromagnetic wave propagation time in the transport medium to determine the properties and occurrence of the geological body.…”

A Study on the Borehole Wall Stability Analysis and Slurry Ratio Optimization for Construction of Pile in Complex Marine Strata

“…Numerous engineering examples have shown that the stability of drilled-shaft walls is influenced by various factors, with mud slurry protection playing a vital role [4]. Scholars have conducted theoretical analysis [5,6], laboratory experiments [7][8][9][10][11], field experiments [12][13][14], and numerical simulations [15][16][17][18] to study the issue of mud slurry protection and soil stability. The unreinforced and geogrid-reinforced soil foundations were modeled using a particle flow code of two dimensions (PFC2D) and the effects of four different factors on footing settlement were investigated [19].…”