Dissertation > Excellent graduate degree dissertation topics show

On the Methods for Surrounding Rock Classification in Construction Stage of Highway Tunnels with High Geostress

Author: RenYang
Tutor: LiTianBin
School: Chengdu University of Technology
Course: Geological Engineering
Keywords: High Stress Highway tunnel Rock classification Extenics Hole diameter Rock pressure
CLC: U459.2
Type: Master's thesis
Year: 2009
Downloads: 327
Quote: 11
Read: Download Dissertation

Abstract


With a large number of deep uphill road tunnel construction, the current rock classification method can not meet a certain extent under the conditions of high stress surrounding rock classification needs, so build highway tunnel under high stress conditions surrounding the construction phase is necessary comprehensive classification method . In this paper, the need for highway tunnel surrounding rock classification, combined with results of previous studies, the use of on-site geological survey and geological data collection, access to relevant information at home and abroad, summarized and analyzed qualitative and quantitative hierarchical classification combining numerical simulation methods and extenics method, the high stress highway tunnel surrounding rock classification stage to discuss several aspects in order to establish high stress rock tunnel construction phase comprehensive classification method. The main results and knowledge obtained as follows: (1) home and abroad through a variety of surrounding rock classification method, and the country has built highway tunnel surrounding rock classification scheme of qualitative indicators selected for analysis and classification, from hard rock, completeness and Other indicators of modifying factors (stress, groundwater and structural plane with hole axis angle relationship) three broad areas, build mud rock mountain highway tunnel construction phase qualitative classification scheme, the use of the program has been excavating the tunnel paragraphs surrounding rock classification and achieved good results. (2) common law and the surrounding rock classification method Q highway tunnel design specifications BQ method applied research shows that stress in the lowlands surrounding segments of poor quality grade Ⅳ, Ⅴ grade rock classification results are good, two kinds of classification method classification consistent with the actual rate is higher, while in the highlands surrounding rock stress segment classification result is poor, especially BQ law consistent with the actual classification rate is low, its applicability is also poor. (3) Since BQ method in the high stress and rockburst segment or segments of large deformation poor suitability classification, this paper BQ method for initial stress reduction coefficient K3 consider the shortcoming, the high stress conditions and rock burst Big rock mass deformation on the impact of the introduction of rock grading. Using the ratio of the stress intensity rockburst intensity is divided into four levels, large deformation is divided into three levels, each level corresponds to the corresponding fold impairment, thus forming rock burst segment and non-segment rockburst initial stress reduction coefficient K31 , as well as large deformation and large deformation segment non-initial stress reduction coefficient K32, then BQ method based on established rock under high stress grading BQ-hg France. (4) using the method of extenics highway tunnel surrounding rock classification. First, through the selection of indicators (paper selected rock strength Rc, RQD value Kv value integrity rock, groundwater status and stress σ1 value), the indicator parameter values ??dimensionless, and then construct the corresponding classical field matter-element Matter-element and node domain, and then determine the weight of each index, and finally through rock correlation function obtained the corresponding level. (5) hole diameter of the tunnel surrounding rock stability and support for impact analysis and discussion. Through the rock at different levels under the numerical simulation of excavation span, span from the qualitative discussion surrounding rock stability, draw span increases the stability of the rock will have a negative impact, especially for poor quality rock rock influence is more obvious. Using a variety of rock pressure formula (industry norms, theoretical formula, the foreign classification system recommended formula) for grade Ⅳ, Ⅴ rock pressure level is calculated, and the calculated results and the span of the effects of stress on the rock analysis and discussion .

Related Dissertations

  1. Study on Prediction and Prevention of Burst in High Stress Area of Deep Mining,TD324
  2. Research of Supporting Technology of Deep Roadway in Jining Ⅱ Coal Mine and Application,TD353
  3. Study of the Composite Shoring about Soft and Deep Laneway with High Stress at Xue Cun Mine,TD353
  4. Yunnan Province the Longling MENGXING lead-zinc roadway surrounding rock stability study,TD32
  5. Analysis of Mechanical Properties and Study about Comprhensive Classfying of the Stability of the Deep Rock Mass of Xinqiao Mine,TD313
  6. Protective layer on the mining of coal and rock deformation and pressure relief gas drainage technology,TD712.6
  7. Study on the Ground Pressure Feature of the Working Face and the Roadway by the Impact of the Mining Overlying Coal Seam,TD322
  8. Characteristics of Deep Structure and Research on the Surrounding Rock Stability of Roadway in Huize Mining Area,TD325.1
  9. The Technology Research on Bolt-mesh-anchor Support in High Stress Coal Roadways in Mei He Coal Mine,TD353
  10. Research on Deformation Failure Mechanism and Bolt-Grouting Reinforcement in High-Stress Deep Soft Rock Roadway,TD353
  11. Study on Stability of Surrounding Rock of High Stress Soft Rock Roadway of Deep Mine,TD353
  12. High stress Guhanshan mine roadway stability and supporting technology,TD353
  13. Study on Water Quality Assessment of Municipal Reclaimed Water Based on Extenics,X824
  14. High Stress Roadway relief mechanism and parameters of blasting,TD322.5
  15. Highway tunnel ventilation simulation of water mist fire suppression effects,U453.8
  16. High Stress Roadway failure characteristics and Supporting Mechanism Study,TD353
  17. Warm mix asphalt flame retardant Preparation and Properties,U414
  18. Site Monitoring and Numerical Simulation for Construction of Highway Tunnel,U456.3
  19. Study on Fire Disaster Relief and Protection of Guangwu Expressway Tunnel Group of Guangdong Province,U458.1
  20. The Analysis and Research on Highway Tunnel GPS Control and Deformation Monitoring,U456.3
  21. Study on the Method for Ventilation of the Long Twin-tube Roadway Tunnel Network,U453.5

CLC: > Transportation > Road transport > Tunnel project > A variety of tunnel > Highway tunnel
© 2012 www.DissertationTopic.Net  Mobile