摘要
南水北调中线一期工程总干渠辉县一标段为全开挖方渠道,开挖后渠坡上分布有中等—强湿陷性黄土和较厚层的强透水性卵石层,虽在渠坡、渠底采取了全衬砌混凝土等防渗措施,但黄土湿陷及卵石层强渗透压力仍可破坏渠坡。为保证渠坡稳定性,拟采用高压摆喷灌浆三管法形成截渗墙法以加固左右岸黄土并防渗。为摸索出施工工艺并验证设计的可行性,布置了三种孔距进行灌浆试验。结果表明,采用孔距1.0m时可达到加固黄土及防渗要求,进而给出了施工参数,可大规模推广应用于辉县一标段渠道高压摆喷灌浆施工中。
Huixian 1st segment of the main canal in central line project of south-to-north water diversion is fully-exca- vation square cross-section channel. There are medium-strong collapsible loess and deep pervious pebble bed in excavation slope. Although impervious measure of lining concrete is taken in channel slope and bottom, the channel slope can be de- stroyed by collapsible loess and pervious pressure of pebble bed. In order to guarantee the stability of channel slope, three-tube method of pressure spout grouting is used to form cut-off wall for reinforcing loess and seepage prevention. The grouting test with three kinds of hole distance is used to seek construction process and verify the feasibility of design. The results show that it can attain the goal of loess reinforcement and seepage prevention when the hole distance is 1.0 m. Furthermore, the construction parameters are obtained, which can be popularized and applied in pressure spout grouting construction of Huixian 1st segment of channel.
出处
《水电能源科学》
北大核心
2012年第7期119-122,共4页
Water Resources and Power
关键词
卵石
湿陷性黄土
透水性
截渗墙
高压摆喷灌浆法
试验
gravel
collapsible loess
perviousness
cut-off wall
pressure spout grouting
test
