Analysis And Real-time Control On TBM Construction Schedule Of Water Conveyance Tunnel

There are many obstacles during the tunnel boring machine (TBM) construction of long-distance water conveyance tunnel, which consist of complex construction techniques, various working procedures, and being affected by many uncertain factors, especially the geologic uncertainty. Different construction measures are taken according to different tunnel conditions reasonably, which bring difficulties in construction management. With system engineering methods and computer simulation technology, the paper develops methods of TBM construction schedule analysis and real-time control for construction schedule which is applied to Xinjiang Bashiyi Daban tunnel construction. The main contents and achievements are as follows:1. Based on the QT BM model, the paper estimates the penetration rate of TBM at different geological conditions and advances the cyclic network simulation (CYCLONE) models of TBM construction. And then based on the analysis of the relationship between the cutterhead thrust (F) and project completion by simulation models, the most reasonable F is selected. Meanwhile, the method of optimizing TBM backup system is proposed and TBM backup system's influence on schedule is analyzed quantitatively. So the number of muck cars, the number of rail intersections are determined reasonably. Moreover, the cyclic network simulation (CYCLONE) model of backup system is built which takes the interaction and interrelation between TBM backup system and TBM driving system into consideration. Finally, the simulation model is applied in the Xinjiang Bashiyi Daban tunnel construction.2. Analyzing on the stochastic characteristics of the geologic spatial tendency, the paper presents a method of geologic prediction basing on Markov process. With this method, the geologic state probabilities along the horizontal alignment of the tunnel can be determined. This is a new approach to quantitatively analyze of the geological risk which the traditional methods have difficulty in measuring. With help of this new idea, the CYCLONE models of TBM construction coupling geologic risk was set up. Then the risk analysis of construction schedule is studied by basing on the Monte-Carlo method.3. Based on theory of real-time control and simulatded forecast of schedule, the process of controlling TBM construction schedule control is analyzed. The software system (TBM-PDC) for construction schedule analysis and real-time control is developed and applied to Xinjiang Bashiyi Daban tunnel. Due to the real construction schedule and the schedule deviation, construction schedule in later stage is analyzed and adjusted. This system provides effective tools for construction managers to control project schedule.