摘要
为探究重塑压力对土石混合体力学性质的影响,利用GDS自动三轴试验系统,进行了不同重塑压力下粘土-砂岩混合体三轴剪切试验,从系统和能量的角度,详细分析了重塑压力对粘土-砂岩混合体剪切强度的影响和剪切破坏的微观过程。结果表明:粘土-砂岩混合体在三轴条件下的应力应变曲线与土体和岩石的不同,块石的存在构建了新的骨架系统;粘土-砂岩混合体的峰值强度和残余强度随着重塑压力增加而升高,并呈现明显的线性关系;粘土-砂岩混合体三轴固结不排水剪切过程中,试样表现为先剪胀后剪缩。
In order to explore the influence of remodeling pressure on the mechanical properties of soil-rock mixture,the triaxial shear tests of clay-sandstone mixture samples were carried out using GDS automatic triaxial test system.From the perspective of system and energy,the influence of remodeling pressure on the shear strength of clay-sandstone mixture and the microscopic process of shear failure were analyzed in detail.The results show that the stress-strain curve of clay-sandstone mixture under triaxial condition is different from that of soil and rock,and the existence of rock constructs a new skeleton system;the peak strength and residual strength of clay-sandstone mixture increase with the increase of remodeling pressure,and show an obvious linear relationship;During the undrained shear process of triaxial consolidation of clay sandstone mixture,the specimen shows dilatation first and then shrinkage.
作者
李福平
LI Fu-ping(Haerwusu Open-pit Coal Mine,China Shenhua Energy Co.,Ltd.,Ordos 017100,China)
出处
《煤炭工程》
北大核心
2020年第S02期105-109,共5页
Coal Engineering
关键词
土石混合体
重塑压力
剪切强度
三轴试验
soil-rock mixture
remodeling pressure
shear strength
triaxial test
