| With the rapid development of underground engineering technology, there are more and more difficulties. As a kind of common underground engineering reinforcement technique, grouting has been widely used. At the same time, it is also an effective way to solve the complex underground water hazards and strengthen the soft groud.Owing to the lack of engineering experience and theoretical basis, there are often much randomness and blindness in using grouting to solve the underground engineering problems, sush as:choosing the method,workmanship and the equioment of grouting reinforcement, determinity of the grouting range and the performance indexes, controling the operation of grouting's quality and testing the grouting reinforcement effect and so on. Something dearly has been paid on the grouting engineering abroad without achieving the expected effect, and there are many different degrees and severe accidents. Many of these accidents have something to do with the check of the grouting effect. So people pay more attention to the grouting effect inspection. Research on grouting effect analysis is very necessary and pressing, and the results will creat huge social benefits and economic benefits in practical projects.This paper firstly describles the development of the grouting technology and effect analysis status in the domestric and foreign and the present research, and at the same time, it also summarizes the related theoretical achievements, analyzes the factors which can influence the grouting effect, and classifies and chooses the grouting effect methods. In view of the current lack of clear judgment standard, it gives relevant evaluating method and standard of grouting effect.Meanwhile, combining with drilling cement grout slurry-supported engineering examples, grouting effect is analyzed. And the camera technology is used for drilling holes position information. The paper analyzes the cause of the loss and leakage layer properties and the slurry-supported plugging scheme of grouting solution and introduces the construction. Based on the failing schemes, I use thin-wall circle theory to analyze the failure mechanism, and set up the fractured rock mass grouting theory and slurry diffusion model, and provide theoretical foundation for other experimental studies.Secondly, according to engineering practices, I conduct indoors simulation tests, observing the whole process of slurry diffusion, analysizing the ability of the slurry injection and factors influencing grouting effect. The relation among the factors is deduced according to the experiment results, and I analyze and check the reasons of the grouting failure and take cognizance of solving the drilling loss problem.Finally, the research shows that drilling loss is very common problem in drilling Wells construction, It should take timely and effective prevention and controling measures, and the cement plugging is one of the common methods. But it must combine with the engineering practice to choose and discuss the material, process and method which are fit for the characteristics of the thief zone. Starting from the engineering projects, this paper puts forward the reason and the disposal measures of plugging failure and has feasibility and the application value to the similar engineering problems, and also very good practical significance to solve the practical problems. |
