摘要
以相似材料制作含交叉裂隙岩体试件,考虑主裂隙与加载方向之间角度变化及主、次裂隙之间角度变化制作20组试件,对试件进行单轴压缩试验,研究交叉裂隙对岩体破坏模式及力学特性的影响。研究表明,主裂隙与加载方向呈0°及90°时,试件破坏主要为沿次裂隙扩展的剪切型破坏;当主裂隙与加载方向呈30°及45°时,试件破坏主要是沿主裂隙扩展所致的剪切型破坏;主裂隙角度一致情况下,大部分含交叉裂隙岩体破坏强度高于含单向裂隙岩体,含交叉裂隙岩体试件应力-应变曲线峰后下降斜率比含单向裂隙岩体大;主裂隙角度一致情况下,当次裂隙与主裂隙呈45°夹角左右时,岩体试件强度较低,当次裂隙与主裂隙呈30°及90°夹角左右时,岩体试件强度较高。
The influences of cross-cracks on the jointed rock mass failure modes and mechanical properties were studied. The brittle jointed rock mass specimens with cross-cracks were simulated by similar material. There were 20 groups of jointed rock mass similar material specimens in which the angle between main crack and loading direction and the angle between main crack and secondary crack were taken as changing parameters. The specimens of jointed rock mass similar material were tested to obtain the influences of cross-cracks on jointed rock mass failure modes and mechanical properties. The test results show that when the angles between main crack and loading direction are 0 ° and 90 ° , the failure modes of specimens are mostly shear type failure propagating from the secondary crack; when the angles between main crack and loading direction are 30° and 45 °, the failure modes of specimens are mostly shear type failure propagating from the main crack; when the main cracks are at same angle, the strength of most jointed rock mass similar material specimens with cross-cracks is higher than the strength of specimens with single crack; the post-peak stress-strain curve descending slopes of most jointed rock mass similar material specimens with cross-cracks are steeper than the slopes of specimens with single crack; the specimens have low strength when the angle between main crack and secondary crack is about 45 °, and the specimens have high strength when the angles between main crack and secondary crack are about 30° or 90° .
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2012年第12期3674-3679,共6页
Rock and Soil Mechanics
基金
高等学校博士学科点专项科研基金新教师类资助课题(No.20110131120035)
山东大学自主创新基金(No.2012TS059)
山东省自然科学基金(No.ZR2012EEQ007)
高等学校博士学科点专项科研基金(No.20100131120046)
关键词
岩体
交叉裂隙
相似材料
破坏模式
力学性能
rock mass
cross-cracks
similar material
failure mode
mechanical property
