摘要
为了研究龙羊峡水库大坝工程中泥质软岩的工程特性,对原状软岩试样开展崩解试验和力学测试。首先通过不同浸水时间的结构状态监测研究泥岩崩解规律,然后对不同浸水时程的试样进行三轴压缩试验,得到不同围压下软岩应力应变关系曲线。结果表明:在0~4 h的浸水时间范围内,泥质软岩结构出现明显的崩解现象,且崩解程度随时间增长而加重;不同固结围压下软岩应力应变关系曲线为应变硬化型;通过对比不同浸水时程下软岩的抗剪强度指标发现,泥质软岩的软化程度随浸水时间增长有明显升高趋势,软化系数与浸水时间保持对数增长关系。
In order to study the engineering characteristics of easily disintegrated mudstone in the diversion tunnel of Longyangxia Water Con⁃trol Project,the disintegration states monitoring and triaxial compression tests under different confining pressures of typical mud⁃soft rock samples were carried out.The test results show that the structure of mud⁃soft rock appears obvious disintegration after 0-4 hours of immer⁃sion,which indicates that the water sensitivity of mud⁃soft rock is strong.The analysis of the triaxial tests of soft rock can be seen that the stress⁃strain curves of soft rock under different consolidation confining pressures are strain hardening curves.By comparing the strength index of the specimens during the immersion process,it can be seen that the softening degree of the mud⁃soft rock sample increases with the in⁃crease of immersion time.
作者
张彩红
ZHANG Caihong(School of Civil Engineering,Xijing University,Xi’an 710123,China)
出处
《人民黄河》
CAS
北大核心
2020年第10期120-123,129,共5页
Yellow River
基金
陕西省自然科学基金资助项目(2017JM5122)
西京学院校级科研基金资助项目(XJ160135)。
关键词
泥质软岩
崩解试验
三轴压缩试验
力学特性
浸水时程
龙羊峡水库
mud⁃soft rock
disintegration test
triaxial compression test
mechanical property
immersion time
Longyangxia Water Control Project
