国际会议汇报ppt(英文)

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Overall Process Safety Management (OPSM) in tunnel construction. A more reasonable solution for the waterproofing and reinforcing works. A real-time update of both environmental parameters and control measures.
Outline
PART 1 Байду номын сангаасART 2 PART 3
Introduction Method Results
PART 4
Conclusion
Introduction
1.1 Background
Shield tunneling technology
Advantages
1. High level of mechanization 2. Fast progression of tunneling works
Disadvantages
1. Large scale 2. Long duration
3. Lesser environmental impact
3. Complex technical issues
1.2 Objective
The primary aims of this study were to investigate:
Ground freezing
2. No significant waterproofing results would be achieved due to the close
proximity to the Yangtze River.
Lowering of water level method
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
Reinforcing
2.1 Safety system design
2.2 Safety analysis
Ground heterogeneity
Construction methods Nonlinear behavior of soils
Systemic
Economic
safety
Numerical simulation
Uniformity
2.3 Safety control process
2.3.2 Freezing control
Layout of freezing holes
Workers are examining the freezing effect.
2.3 Safety control process
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1.3 Project profile
Characteristics: 1. Double-spool tunnel connecting two large cities 2. Two sets of ventilation shafts 3. A curve radius of 350m and an extremely close distance away from Yangtze River
2.3.3 UCW removing control
Workers are cutting down
the steel within UCW.
Workers are pasting quilts onto
the workface of the tunnel portal.
Results
3 Results
4. Fine sandstone and silty clay
Wuhan Yangtze Metro Tunnel (WYMT)
Method
2.1 Safety system design
Waterproofing
1. The cement paste tends to be washed
away by the flowing water, resulting in poor reinforcement. A high-pressure jet grouting
Apply numerical simulation by ANSYS
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and reinforcing works
Combine freezing method and HJGP
Include the preliminary deviation ahead of the drilling process
2 Boring attitude control of TBM
3 Numerical analyses
requirements
ANSYS
Soil structure interaction
2.3 Safety control process
2.3.1 Reinforcement control
Items Reinforced soil strength Reinforced soil permeability Reinforced soil homogeneity Checking methods Checking criteria Drill to obtain two cores on each side deep into the >=1 Mpa excavation bottom five miles away from the tunnel axis, and then conduct the core test. Drill four holes well-distributed around the excavation region, and then test the permeability of each hole. Drill to obtain four cores well-distributed around the excavation region, and then test the homogeneity of each core. <=1 m3/d
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
3 Results
a
b
a: Distribution of compressive stress b: Distribution of tensile stress c: Distribution of shear stress
c
Conclusion
Conclusion
1 Treat schemes for waterproofing