渭北砂泥岩地区坝基开挖松弛与透水率变化研究  

Study on Relaxation and Permeability Change of Dam Foundation Excavation in the Sand and Mudstone Area of Weibei

作　　者：李鹏 张科 罗志刚[1] 李少平 Li Peng;Zhang Ke;Luo Zhigang;Li Shaoping(PowerChina Northwest Engineering Co.,Ltd.,Xi'an 710065,Shaanxi;Shaanxi Water Resources and River Reservoir Dispatching Center,Xi'an 710004,Shaanxi)

机构地区：[1]中国电建集团西北勘测设计研究院有限公司,陕西西安710065 [2]陕西省水资源与河库调度中心,陕西西安710004

出　　处：《陕西水利》2023年第9期109-111,共3页Shaanxi Water Resources

摘　　要：通过对某工程区开挖松弛后岩体及天然状态下岩体的透水率试验进行对比分析,结果表明:砂泥岩地层岩体松弛导致在较高压力持续时间较长时,透水率增加以及地面抬动,松弛范围大致与上覆盖重相当,通过透水率变化可初步判别松弛深度。建议在坝高不大水头有限的砂泥岩地区,可适当降低灌浆压力,尤其在浅部(10 m以内)应该以不破坏岩土体结构,产生抬动为标准。Based the comparative analysis on the relation of rock mass after excavation and natural permeable rate test,which showed that the sand shale formation rock relaxation cause lasting time in high pressure permeable rate increases and carried on the ground.Roughly through permeable rate changes can be preliminary judging relaxation depth.It is suggested that the grouting pressure can be appropriately reduced in the sand and mudstone area with small dam height and limited water head,especially in the shallow part(less than 10 m).The standard should be ensure that the rock and soil structure should not be damaged and the lifting movement should be generated.

关 键 词：压水试验 透水率 松弛岩体 灌浆压力 

分 类 号：TV551.42[水利工程—水利水电工程]