Study On The Mechanism And Application Of High-pressure Jet Grouting Anti-seepage Curtain

High-pressure jet grouting technology is a kind of foundation treatment developing from the combination with high-pressure water jet cutting technique on the basis of chemical grouting. Being highly-pressed, fast and energetic, the jets’ uses are able to cut the soil efficiently and generate a large-diameter concretion in the soil which is effective in foundation stabilization and anti-seepage project. Because of its convenience in construction, superiority in speed, mild disturbance to the earth and lower cost, this technology is widely applied to many fields such as civil engineering, water conservancy projects and environmental engineering.Firstly, the thesis makes a generalization on the safety of earth-rock dams, and high-pressure jet grouting technology is thus brought into this thesis with a brief introduction on its development, classification and its range of application in engineering.Secondly, the thesis makes a research on the ground-breaking mechanism and grouting mechanism of the high-pressure jet grouting technology with a study on the structure and dynamic properties of high-pressure water jet.Thirdly, with finite element software, the thesis studies the anti-seepage mechanism of the closed anti-seepage curtain, pensile anti-seepage curtain and half-closed anti-seepage curtain of homogeneous earth-rock dam, and makes an analysis on the important functions of anti-seepage curtain in anti-seepage projects:①to bear the most action of effective water head, and reduce exudation-pressure and the action of the water head on pervious bed in the soil;②to slow down the water flow in permeable bed, and reduce the flow rate per unit time;③to elongate the seepage course of the water. The thesis also proposes anti-seepage efficiency to evaluate the anti-seepage effect, and the major factors affecting anti-seepage efficiency is analyzed.Fourthly, the thesis makes a brief elaboration on the main design Parameters and measuring methods for high-pressure jet grouting anti-seepage curtains. Lastly, the thesis makes an analysis on the anti-seepage effect of high-pressure jet grouting anti-seepage curtains by taking the anti-seepage project for the embankment foundation of Songya Lake’s ecological Park as the specific instance.