摘要
为探讨西宁盆地古近系地层岩石崩解特性,以西宁盆地古近系洪沟组和马哈拉沟组红层泥岩与石膏岩岩块为研究对象,通过岩块快速崩解试验明确其耐崩解性指数,并结合岩块物相特性以及崩解过程中的岩块分形特征进一步探讨岩块崩解机理。结果表明:4类岩块中洪沟组泥岩的耐崩解性高于其他3类岩块,泥岩和石膏岩分别表现物理化学崩解和机械崩解,岩块分形维数变化与其崩解破碎程度密切相关。基于崩解特性和分形维数总结4类岩块崩解模式,即洪沟组泥岩呈“突变—稳定”模式,马哈拉沟组泥岩呈“渐进解体—表面剥蚀”模式,洪沟组石膏岩呈“裂隙扩展—表面磨蚀混合”模式,马哈拉沟组石膏岩呈“裂隙扩展主导”模式。
This study aims to investigate the rock disintegration characteristics of Paleogene strata in the Xining basin.Red mudstone and gypsum rock blocks from the Honggou Formation and Mahalagou Formation in the Xining basin were taken as the research objects.The disintegration resistance indices of the rock blocks were determined through rapid disintegration tests.The disintegration mechanism was further explored by analyzing the phase characteristics of the rock blocks and their fractal characteristics during the disintegration process.The results indicated that among the four types of rock blocks,the mudstone from the Honggou Formation exhibited the highest disintegration resistance.Mudstone and gypsum rock primarily underwent physicochemical disintegration and mechanical disintegration,respectively.Changes in the fractal dimension of the rock blocks were closely related to their degree of disintegration and fragmentation.Based on the disintegration characteristics and fractal dimensions,the disintegration modes of the four rock block types were summarized as follows:the mudstone of the Honggou Formation showed a mutation-stabilization mode;the mudstone of the Mahalagou Formation presented a progressive disintegration and surface spalling mode;the gypsum rock of the Honggou Formation exhibited a mixed mode of fracture propagation and surface abrasion;the gypsum rock of the Mahalagou Formation showed a fracture propagation-dominated mode.
作者
王得福
朱文惠
刘亚斌
宋英华
梁燊
魏菱杉
WANG Defu;ZHU Wenhui;LIU Yabin;SONG Yinghua;LIANG Shen;WEI Lingshan(School of Geological Engineering,Qinghai University,Xining 810016,China;Key Laboratory of Genozoic Resources and Environment in the Northern Margin of the Qinghai Xizang Plateau,Xining 810016,China;China Research Center for Emergency Management,Wuhan University of Technology,Wuhan 430070,China;School of Safety Science and Emergency Management,Wuhan University of Technology,Wuhan 430070,China)
出处
《青海大学学报》
2026年第1期95-104,共10页
Journal of Qinghai University
基金
青海省科学技术厅项目(2024-SF-129)。
关键词
西宁盆地
红层泥岩
石膏岩块
崩解特性
崩解机理
Xining basin
red mudstone
gypsum rock blocks
disintegration characteristics
disintegration mechanism
