Building Resiliency for Emergency Management in East Asia and the World
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Influence of Spatial Variability of Soil Young's Modulus on Tunnel
Engineering Geology 228 (2017) 357–370 Contents lists available at ScienceDirect Engineering Geology journal homepage: www.elsevier.com/locate/enggeo Influence of spatial variability of soil Young's modulus on tunnel MARK convergence in soft soils ⁎ H.W. Huang, L. Xiao, D.M. Zhang , J. Zhang Department of Geotechnical Engineering, Tongji University, 1239 Siping Rd, Shanghai 200092, China ARTICLE INFO ABSTRACT Keywords: Field data have shown the fact that soil spatial variability could aggravate the uncertainty of tunnel convergence Random field ΔD (a key indicator for serviceability and safety of tunnels). This paper presents a detailed numerical analysis to Spatial variability investigate the probabilistic response of tunnel convergence in spatially varied soft soils. The soil Young's Anisotropy modulus Es is highlighted and modeled with isotropic and horizontally stratified anisotropic random fields, Scale of fluctuation respectively. The influence of scale of fluctuation (SOF) δ of the E on convergence ΔD is discussed in detail with Tunnel s respect to different directions, i.e., the vertical and horizontal directions both for δ and ΔD. It is observed that Young's modulus ignoring the spatial variability of Es, i.e., disregarding the possibility of unfavorable soft soil (low stiffness soil) locally around tunnel, can underestimate the mean value of ΔD. The horizontally stratified anisotropic random field is more appropriate than isotropic random field in the sense of an accurate prediction, especially when extreme tunnel convergence occurs. In horizontally stratified anisotropic random fields, the influence of hor- izontal and vertical SOF is different on tunnel convergence. The surrounding soils near tunnel crown and invert or across tunnel horizontal diameter are very critical to the tunnel convergence. -
Guidence for VLPR 2012 Summer School
USA‐Sino Summer School in Vision, Learning, Pattern Recognition: VLPR 2012 SHANGHAI Dear international speakers and students: Welcome to our Summer School, the VLPR 2012 in Shanghai, China. Attached is the guidance in Shanghai and daily arrangement for you during your stay. If you need help while in Shanghai, you may call Mr. Li at 15026678001, or Miss Gao at 15201928370. Travel Guidance from AirPort to Fudan University (Handan road campus) Shanghai has two airports, Shanghai Hongqiao International Airport and Shanghai Pudong International Airport. The taxi service is very convenient, you can pick up your luggage, follow the guidance to find the taxi waiting line. While in the car, please hand the direction card attached in this file to the taxi driver. He will take you to the front gate of Fudan University, and then the hotel inside the campus. In case you need any help, please call Mr. Li at 15026678001, or Miss Gao at 15201928370. They will wait for you at the front desk of the hotel, to pay for the taxi , help you check in and register for the school. In case you pay the taxi by yourself, please get the invoice from the driver, and we will reimburse you later. From Hongqiao International Airport to FuDan University • Shanghai metro line No. 10(New jiangwan city direction 新江湾城方向), off board at Guoquan Road Station or Jiangwan stadium Station, then take taxi (14 RMB startup fee). • Taxi (around 90RMB daytime/130RMB after 11pm.) From PuDong International Airport to FuDan University • Airport Shuttle Bus line 4(机场4线) off board at Wujiaochang Station(五角场 站), then take taxi (14RMB startup fee). -
Accuracy Check and Comparative Analysis of Horizontal Fiber-Optic
E3S Web of Conferences 218, 03025 (2020) https://doi.org/10.1051/e3sconf/202021803025 ISEESE 2020 Accuracy Check and Comparative Analysis of Horizontal Fiber- Optic Gyro Inclinometer in Freezing Hole JIANG Guojing1,2, LI Fangzheng2, ZHOU Xiaomin1, GAO Wei2, CUI Bingbing2 1University of Science and Technology Beijing,Beijing 100083,China; 2Beijing China Coal Mine Engineering Co., Ltd., Beijng 100013,China) Abstract:Based on the principle of fiber-optic gyro inclinometer, the characteristics of horizontal freezing hole and the working conditions, it is analyzed that the horizontal hole fiber-optic gyroscope tilting technology for freezing holes is one of the most reliable methods. In order to verify the azimuth measurement error of the horizontal fiber optic-gyro inclinometer, the simulation test under the 1:1 working condition was carried out with the actual working conditions on site. Compared with the total station measurement data, it was concluded that 85.2% of the data is in measurement error within ±2°, 55.6% of the data is within ±1°, which verifies the reliability of the measurement data of the horizontal fiber-optic gyro inclinometer. At the test level of α=0.05, the azimuth test error accords with the normal distribution of μ=0.54 and σ=0.73. In the actual use process, the algorithm can be used to optimize the measurement data by taking multiple measurements and taking the average value in combination with the field conditions, so that the data can be closer to the true value. have sprung up in first-tier cities, the crossing freezing project starts to take shape [8].