摘要
讨论在基坑较深、坑内地下水丰富且水力坡降大,环境水动力条件复杂的情况.旋喷作业所产生的高压水气激振引起土体液化,这种高压水气压力与地下水渗透动水压力引起流体压力耦合,故渗流带走土中及水泥细颗粒,结果影响到高压旋喷桩的地基基础处理效果.防止两种液化耦合的条件是保持土体渗透坡降小于最小临界坡降(浮容度γ').
The high pressure gas,liquid produced by rotating jet grouting has easily led to soil liquefaction under the environment of deep foundation pits with abundant groundwater,high hydraulic gradient and complex dynamic water coditions. The high pressure gas,liquid and underground permeable water are combined to form a liquid pressure coupling. This may cause erosion of cement fine particles and influence the results of foundation preparation. The criterion of avoiding the coupling of these two liquefactions shall be that the soil mass permeable gradient be less than its critical gradient.
出处
《水利水电技术》
CSCD
北大核心
2004年第5期32-34,共3页
Water Resources and Hydropower Engineering
关键词
液化耦合
高压旋喷桩
基础处理
砂土地基
砂土液化
liquefactions coupling
high pressure jet grouting pile
foundation preparation
sand foundation
sand liquefaction
