Investigation of the Degradation Mechanism of the Tensile Mechanical Properties of Sandstone under the Corrosion of Various pH Solutions

Abstract

The research aimed to examine the impact of different pH solutions on the tensile mechanical properties of saturated and natural sandstone specimens. The study utilized the WHY-300/10 microcomputer-controlled pressure testing machine to conduct Brazil splitting tests and employed acoustic emission and local dynamic strain testing techniques. The results indicated the tensile strength and split tensile modulus of the sandstone specimens gradually decreased with the polarisation of the solution pH, and the acoustic emission signal ring number monitoring values showed an increasing trend. The pH of the soaking solution followed an exponential decay pattern over time, eventually tending towards weak alkalinity. A new damage variable based on the cumulative ring count after chemical corrosion was defined to indirectly analyze the degree of corrosion degradation. It was discovered that in acidic or alkaline environments, the internal crystals of the rock are dissolved, weakening the mineral interconnections and causing a deterioration in tensile stress and strength. These findings can provide valuable insights for ensuring the safety and stability of the Denglou Mountain Tunnel in Yunnan Province.

Bedding Slope Destabilization under Rainfall: A Case Study of Zhuquedong Slope in Hunan Province, China

“…Without considering the matrix suction or when the material is close to saturation, (µ a − µ w ) tan φ b = 0, and Equation ( 6) is the formula for saturated materials. The rock-soil body is assumed to be ideal elastic-plastic bodies, and the constitutive model of the double-variables strength theory is used [21]. Based on SRM [22], the shear strength of the material is reduced when the three shear strength parameters are simultaneously divided by an increasing reduction factor until the slope is in a state of instability and failure [23]:…”

Transforming Landslide Prediction: A Novel Approach Combining Numerical Methods and Advanced Correlation Analysis in Slope Stability Investigation

“…Firstly, methods based on the principle of limit equilibrium: These methods assume that the slope is close to collapse and that the forces acting on the potential failure surface are in equilibrium. Some examples of these methods are the Fellenius, Bishop, Spencer, and Morgenstern-Price approaches [14]. Secondly, methods based on observation and experience for the analysis of rock slopes: Approaches such as SMR (Slope Mass Rating) and Q-Slope are based on the correlation between slope stability and geological characteristics [15].…”