水力发电学报2026，Vol.45Issue(1)：76-86,11.DOI:10.11660/slfdxb.20260108
渗透溶蚀对西域砾岩强度及破坏模式影响研究
Study on strength and failure mode of Xiyu conglomerate after infiltration and dissolution
杨贵 1高嘉轩 1朱锦 1邓伟杰2
作者信息
- 1. 河海大学 精细爆破全国重点实验室,南京 210024||河海大学 土木与交通学院,南京 210024
- 2. 黄河勘测规划设计研究院有限公司,郑州 450003
- 折叠
摘要
Abstract
Aiming at seepage-mechanical instability caused by the weakening of Xiyu conglomerate when it meets water,we conduct seepage dissolution tests and mechanical tests on the conglomerate under different seepage pressures-for the Momoke water control project in Kashgar,Xinjiang-focusing on the influence of seepage pressures and loading paths on the seepage characteristics and strength evolution of rock mass.The results show time variations in permeability coefficients feature two stages:In initial stage,the water absorption and expansion of clay minerals lead to a sudden drop in the rock mass's permeability(41%-52%within 48 h at 0.05 MPa);in later stage,dissolution of its calcium cement leads to significant adjustment in its pore structure with permeability approaching a stable value(2.40-6.45 mD).Variations in calcium ion concentration confirms the characteristics of water-rock reaction in the two stages.Direct loading causes a sudden drop in the conglomerate's permeability and a continuous damage to its structure,while step-by-step loading promotes its dynamic pore erosion-siltation balance,resulting in a smaller attenuation range of its mechanical parameters.The coupling effect of infiltration and dissolution generates nonlinear deterioration in the conglomerate's mechanical properties,and an increase in infiltration pressure causes a nonlinear decrease in a number of its parameters-such as compressive strength,elastic modulus,residual strength,and tensile strength.Damage to its microstructure makes the failure mode shift from brittle splitting to tensile-shear composite failure.This study lays a basis of multi-field coupling analysis for stability prediction of Xiyu conglomerate strata.关键词
西域砾岩/渗透溶蚀/抗压强度/渗透率/破坏模式Key words
Xiyu conglomerate/infiltration and dissolution/compressive strength/permeability/failure mode分类
建筑与水利引用本文复制引用
杨贵,高嘉轩,朱锦,邓伟杰..渗透溶蚀对西域砾岩强度及破坏模式影响研究[J].水力发电学报,2026,45(1):76-86,11.
