摘要
洛阳砂卵石土现场直剪试验结果表明：对于含水率约为2％，粗粒含量P，约为78．66％的砂卵石土，黏聚力c=22～34kPa，内摩擦角φ=38°～40°。黏聚力和内摩擦角变化对预应力全黏结锚杆支护体系整体稳定性和锚杆轴力的影响分析表明：随着黏聚力的增加，砂卵石土层中锚杆轴力明显减小，基坑整体稳定性大幅增加。黏聚力增加约30kPa，基坑整体稳定性系数提高约11％～15％。
Direct shear field test of sandy pebble soil shows that cohesion c ranged from 22 kPa to 34 kPa and internal friction angle φ ranged from 38~to 40 ,when water content is about 2% and coarse content is about 78. 66%. Effect of cohesion and internal friction angle on retaining structure stability and bolt axial force of prestressed fully grouted bolt support is studied. The result shows that the axial force of bolt is significantly reduced and the global stability of excavation is greatly improved with the increase of cohesion. Increase as the cohesion of 30 kPa, the global stability coefficient of excavation increases by about 11% ~ 15%.
作者
李明宇
姜平远
刘晓江
沈世豪
王边江
LI Mingyu JIANG Pingyuan LIU Xiaojiang SHEN Shihao WANG Bianjiang(School of Civil Engineering of Zhengzhou University, Zhengzhou 450001, China Underground Engineering Safety and Quality Control of Henan Engineering Laboratory, Zhengzhou 450001, China)
出处
《结构工程师》
北大核心
2016年第4期160-165,共6页
Structural Engineers
基金
国家自然科学基金项目(51508520)
关键词
砂卵石土
现场直剪试验
全黏结式锚杆
稳定性
抗剪强度指标
sandy pebble soil, direct shear field test, fully grouted bolt, stability, shear strength index
