工程地质学报2024，Vol.32Issue(1)：52-63,12.DOI:10.13544/j.cnki.jeg.2022-0832
水化学环境下白垩系五龙组砂岩崩解能量耗散模型
DISINTEGRATION ENERGY DISSIPATION MODEL OF WULONG FOR-MATION SANDSTONE IN CRETACEOUS UNDER HYDROCHEMICAL EN-VIRONMENT
摘要
Abstract
The sandstone of the Cretaceous Wulong Formation is highly susceptible to erosion and disintegration in hydrochemical environments due to its young age,relatively short deposition time,and incomplete internal cementa-tion,leading to various disasters.This study focuses on the cyclic disintegration test of the Cretaceous Wulong For-mation sandstone in chemical solutions with different acidity and alkalinity.The disintegration resistance index of the rock during the disintegration process under the action of hydrochemistry was analyzed through experiments.Af-ter each disintegration cycle,the mass percentage of disintegration in each particle size range was obtained to ana-lyze the disintegration characteristics of the Wulong Formation sandstone in a hydrochemical environment.Micro-scopic observation and detection methods,including X-ray diffraction and scanning electron microscope tests,were employed to explore changes in mineral components before and after disintegration,as well as the microscopic char-acteristics of the rock during disintegration.A mathematical model of energy dissipation,reflecting the disintegration process based on thermodynamics and fracture mechanics theories,was constructed.The research results indicate that the overall disintegration rate of the Cretaceous Wulong Formation sandstone increases initially and then decrea-ses,eventually stabilizing.The disintegration intensity of the Wulong Formation sandstone exhibits a differentiated characteristic of acid＞alkaline＞neutral.The disintegration particle gradation distribution data and micro-geometric structure parameters under different disintegration cycles were incorporated into the energy dissipation model.The a-nalysis demonstrates that the energy dissipation model of rock disintegration can effectively characterize the disinte-gration process.These findings can serve as a reference for studying the mechanism of rock disintegration.关键词
岩石崩解/能量耗散/水化学环境/干湿循环Key words
Rock disintegration/Energy dissipation/Hydrochemical environment/Dry-wet cycle引用本文复制引用
左清军,朱盛,汤罗圣,吴立,易庆林,李攀..水化学环境下白垩系五龙组砂岩崩解能量耗散模型[J].工程地质学报,2024,32(1):52-63,12.基金项目
国家自然科学基金项目(资助号:41402259),武汉市重点研发计划项目(资助号:2022012202015024).This research is supported by the National Natural Science Foundation of China(Grant No.41402259)and Wuhan Key R&D Plan Project(Grant No.2022012202015024). （资助号:41402259）
