国际会议汇报ppt(英文).pptxVIP

Safety management in tunnel construction: Case study of Wuhan metro construction in China Author： MiroslawJ. Skibniewski Lieyun Ding, et al Reporter: Wu Tong-gang Central South University New words Shaft: 通风井 Grouting: 灌浆，给…灌浆 High-pressure jet grouting piles(HJGP): 高压喷射灌浆柱 Silty clay: 粉质黏土 Tunnel boring machine(TBM): 隧道掘进机 Gush: 涌出 Double-spool: 双轴 Outline PART 1 Introduction PART 2 Method PART 3 Results PART 4 Conclusion Introduction 1 1.1 Background Shield tunneling technology Advantages Disadvantages 1. High level of mechanization 1. Large scale 2. Fast progression of tunneling works 2. Long duration 3. Lesser environmental impact 3. Complex technical issues 1.2 Objective 1.3 Project profile Wuhan Yangtze Metro Tunnel (WYMT) Characteristics: Double-spool tunnel connecting two large cities Two sets of ventilation shafts A curve radius of 350m and an extremely close distance away from Yangtze River 4. Fine sandstone and silty clay Method 2 Waterproofing Ground freezing Lowering of water level method Reinforcing 1. The cement paste tends to be washed away by the flowing water, resulting in poor reinforcement. A high-pressure jet grouting 2.1 Safety system design 2. No significant waterproofing results would be achieved due to the close proximity to the Yangtze River. 2.1 Safety system design Ground heterog-eneity Constru-ction methods Soil structure interact-ion Non-linear behavior of soils 2.2 Safety analysis Systemic safety Economic requirements Numerical simulation ANSYS 2.3 Safety control process 2.3.1 Reinforcement control Items Checking methods Checking criteria Reinforced soil strength Drill to obtain two cores on each side deep into the excavation bottom five miles away from the tunnel axis, and then conduct the core test. =1 Mpa  Reinforced soil permeability Drill four holes well-distributed around the excavation region, and then test the permeability