坝基全风化花岗岩工程地质特性试验研究  

Experimental study on the engineering geological characteristics of fully weathered granite at dam foundations

作　　者：张新佳 王国岗 陈书文[1] ZHANG Xinjia;WANG Guogang;CHEN Shuwen(China Water Resources Beifang Investigation,Design and Research Co.,Ltd.,Tianjin 300222,China)

机构地区：[1]中水北方勘测设计研究有限责任公司,天津300222

出　　处：《水利建设与管理》2025年第2期26-31,共6页Water Conservancy Construction and Management

摘　　要：本文研究了甘肃全风化花岗岩物质组成、矿物成分,以及原岩、重塑样和击实样的压缩性、抗剪强度、渗透稳定性等特性。指出全风化花岗岩呈中等压缩性,击实后呈低压缩性;不同状态下φ值较稳定,c值变化较大,结构面强度低于颗粒咬合力,起到控制抗剪强度的作用;全风化花岗岩击实样应力-应变关系呈应变硬化特征;三轴试验表明峰值偏应力随围压增大呈非线性增大趋势,φ值随围压增大呈线性减小趋势;全风化花岗岩为弱—中等透水性,渗透破坏类型主要为管涌。This paper investigates the material composition and mineral components of fully weathered granite in Gansu,as well as the compressibility,shear strength,and permeability stability characteristics of its parent rock,remolded samples,and compacted samples.It points out that fully weathered granite exhibits medium compressibility,while compacted samples show low compressibility.Theφvalue remains relatively stable under different states,while the c value varies significantly.The strength of structural planes is lower than particle interlocking force,playing a controlling role in shear strength.The stress-strain relationship of compacted fully weathered granite demonstrates strain-hardening behavior.Triaxial tests reveal a nonlinear increase in peak deviator stress with increasing confining pressure,while theφvalue decreases linearly with increasing confining pressure.Fully weathered granite is classified as having weak to moderate permeability,with piping being the primary type of seepage failure.

关 键 词：全风化花岗岩 抗剪强度 三轴压缩试验 

分 类 号：TV52[水利工程—水利水电工程]