| On the development of the whole engineering field from the history, the constructions of long and huge bridges developed fast in 19th century; high-rise building developed in 20th century; and in 21st century, developments of long and huge tunnels and underground spaces will become the leading roles. Therefore, tunnel engineering will play more and more important effect in all kinds of constructions. Nowadays, great numbers of tunnels and underground engineerings have been constructed in countries all around the world, and the scales and quantities of tunnels and underground engineerings in our country are in a leading position in the world, so it is of great practical significance studying on the tunnel engineering.Comparing with the traditional mining method, new Austrian method (NATM) has various kinds of advantages, thus, NATM has become one of the most important construction methods in our country. The main characteristic of NATM is the applications of many measurement means on the dynamic monitoring of the tunnel surrounding rock after excavation which could guide the designs and constructions of tunnel supporting structure. It is very important to monitor in the tunnel constructions, and the construction monitoring has become the determination of NATM. Based on the analysis and treatment of measurement data, parameter-adjusting of the primary support and secondary lining can be provided in order to master the geological condition accurately and make a fully understanding on the properties, self-stability of the surrounding rock. In this way, reasonable and effective excavation methods and support measures can be taken, and the potential geological hazards of tunnels may be prevented. Therefore, the safety of the engineering constructions will be guaranteed, meanwhile, the construction period can be shortened, and the cost of the engineering can be saved. It is of great practical and theoretical significance studying on efficient monitoring data processing methods for smooth construction and safe operation of the speedway tunnels.Tunnel engineering belongs to underground engineering which is the typical geological engineering, so there are many factors influencing the stability of the tunnel. After the excavation of the surrounding rock, the initial rock mass structure and equilibrium condition of forces will be destroyed, and the stress condition around the rock will be changed, in this situation, the geological hazards may be happened which will affect the constructions of tunnels. Some measures should be carried out to reduce the influence of the geological hazards, such as investigations of thorough geological, surrounding rock grades, harmful geological phenomena, and then reasonable scheme of designs and constructions in tunnels can be raised up. However, restricted by the geological exploration levels and construction expenditures, it is very difficult to investigate the conditions and characteristics of engineering rock mass and predict the location, scale and properties of the potential geological hazards. Therefore, geological advanced forecast methods which could guarantee the safe construction, improve construction efficiency, shorten construction periods and avoid construction accidents have been attached to solve these problems in the processing of constructions. Currently, each of common geological advanced forecast methods has the different functions and defects. It is significant to find the geological advanced forecast method which has wider application scope, higher forecasting precision and longer forecasting range.The author took part in the project"Monitor measuring and Geological Advanced Forecast in Zhuyong Speedway Tunnel"in September 2006, during the 6 months in Zhejiang province, the author got a great numbers of valid monitoring data and provided many accurate forecasting. On the basis of the study on the analysis of monitoring data and the geological forecasting methods, combining with the engineering example, statistical analysis software SPSS has been brought into the analysis of monitoring data for the purpose of obtaining convenient and efficient methods, in this way, the design and construction of the tunnel can be carried out timely and accurately. In this paper, fractal theory and extension theory have been taken into the geological advanced forecast of tunnel surrounding rock in order to reduce the working strength of technicians, improve working efficiency and forecasting accuracy. 2 tunnels have been chosen from Jinhua site in Zhuyong speedway, they are: shallow buried multiple-arch short tunnel and separated long tunnel corresponding to Yangjia tunnel and Xihualing tunnel which have different geological problems and emphasis of the monitoring forecast. Comprehensive analysis study on the monitoring data in Yangjia tunnel has been carried out by SPSS, and then, comparing with the practical condition of the engineering, geological advanced forecast based on fractal theory and extension theory has been taken in Xihualing tunnel.By comparing monitoring data with the practical condition of Yangjia tunnel, it is known that the software SPSS can predict the variations of each monitoring value of the tunnel and the stability of surrounding rock. At the same time, by cluster analysis, reasonable time of secondary lining which reflects the process of the design and construction has been got. In this way, the applicability of SPSS on the analysis of tunnel monitoring data has been proofed. Based on the results of the applications on fractal theory and extension theory, it shows that by using the fractal characteristics of surrounding rock joints for the geological advanced forecast, the working strength of technicians could be reduced and the efficiency of the work could be improved; by using extension theory, each aspect of factors can be considered in the prediction of the stability of rock mass. Combining the two theories in advanced forecast, the fractal-extension system can be established to improve work efficiency and reduce working strength, meanwhile, it can also enhance the accuracy and reliability of the forecast.It has been proved that the application of SPSS on tunnel monitoring data analysis plays an important role in tunnel monitoring data analysis which enhances the forecasting accuracy of the monitoring data, and provides reliable prediction for the safety of the construction and the stability of surrounding rock. By using SPSS in the analysis of monitoring data, the methods of in-site data system can be enriched. On the fractal theory and extension theory, the reliability and the working condition of technicians of the geological advanced forecast can be improved, the interferences causing by the geological forecast has been reduced in order to accelerate the engineering progress and guarantee the safety of the tunnel constructions to the utmost extent.
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