| 基于以气驱水技术的含水地层灌浆改性试验研究 |
| |
| 引用本文： | 王江营,张贵金,刘福东,陈安重,范明.基于以气驱水技术的含水地层灌浆改性试验研究[J].水文地质工程地质,2018,0(6):127-127. |
| |
| 作者姓名： | 王江营 张贵金 刘福东 陈安重 范明 |
| |
| 作者单位： | 1.长沙理工大学水利工程学院，湖南 长沙410076；2.水沙科学与水灾害防治湖南省重点实验室，湖南 长沙410076；3.五凌电力有限公司，湖南 长沙410004；4.中南勘测设计研究院有限公司，湖南 长沙410014；5.长沙普照生化科技有限公司，湖南 长沙410000 |
| |
| 基金项目： | 国家自然科学基金（51508039）；湖南省重大水利科技项目(湘财农指(2015)245号) |
| |
| 摘 要： | 当对含水地层进行灌浆改性时，通常会受到土体孔隙中自由水的不利影响。为此，考虑将以气驱水技术应用于含水地层化学灌浆中，以提高改性效果。对饱和黏土与粉质砂土开展以气驱水可行性试验，结果显示在饱和粉质砂土中充气驱替孔隙中自由水具有较好的可行性，在饱和黏土中则难以顺利进行。这是因为土体内部孔隙大小会直接影响初始进气值Pc，同时充气压力亦不能超过极限压力Pmax，否则土体内部会发生劈裂破坏，形成大范围空气通道；研制含水地层以气驱水化学灌浆模拟装置，以粉质砂土为研究对象进行对比试验，试验结果显示在以气驱水技术的辅助下进行化学灌浆可更加显著地改善原有土体的渗透性、无侧限抗压强度与微观结构，电子显微镜扫描也显示出相似结果，这是因为通过充气能够在含水地层中产生空气隔幕，为浆液提供良好的灌注、凝硬环境。
|
| 关 键 词： | 含水地层 以气驱水 化学灌浆 初始进气值 渗透性 无侧限抗压强度 |
| 收稿时间： | 2017-07-12 |
| 修稿时间： | 2017-12-04 |
An experimental study of grouting in water-bearing ground based on the technology of gas driven water |
| |
| WANG Jiangying,ZHANG Guijin,LIU Fudong,CHEN Anzhong,FAN Ming.An experimental study of grouting in water-bearing ground based on the technology of gas driven water[J].Hydrogeology and Engineering Geology,2018,0(6):127-127. |
| |
| Authors: | WANG Jiangying ZHANG Guijin LIU Fudong CHEN Anzhong FAN Ming |
| |
| Affiliation: | 1.School of Hydraulic Engineering, Changsha University of Science & Technology, Changsha, Hunan410076, China; 2.Key Laboratory of Water-Sediment Science and Water Hazard Prevention of Hunan Province, Changsha, Hunan410076, China; 3. Wuling Power Co. Ltd., Changsha, Hunan410004, China; 4. Zhongnan Engineering Co. Ltd., Changsha, Hunan410014, China; 5.Changsha Biochemical Technology Co. Ltd., Changsha, Hunan410000, China |
| |
| Abstract: | If the water-bearing ground is modified by grouting, the pore water will have an adverse influence on the grouting effect under normal conditions. In order to improve the grouting effect, the technology of gas driven water is proposed to apply to the chemical grouting in water-bearing ground. The feasibility test of gas driven water is carried out in the saturated clay and silty sand. The results show that the gas can drive the pore water in the saturated silty sand, but not in the saturated clay. The reason for this is that the size of soil pore will directly affect the initial air-entry value Pc. What’s more, the air pressure should not exceed the limit stress Pmax, otherwise the split failure and large-scale air passage will occur within the soil. An imitative experimental device for the gas driven water and chemical grouting in the water-bearing ground is designed, and some contrast test are conducted in the saturated silty sand. The results show that the chemical grouting can improve more significantly the permeability, unconfined compression strength and microstructure of the saturated silty sand with the aid of air charging technique, and the SEM photographs also show the same consequence. In general, an air curtain will be generated in the water-bearing ground via air charging, which can provide a favorable environment for the grouting, setting and hardening of grout. |
| |
| Keywords: | |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《水文地质工程地质》浏览原始摘要信息 |
|
点击此处可从《水文地质工程地质》下载全文 |
|
