Dissertation > Excellent graduate degree dissertation topics show

Study on Surrounding Soft Rock Stability of Tunnel in High Stress

Author: DengKun
Tutor: HuiXingTian
School: Xi'an University of Science and Technology
Course: Bridge and Tunnel Engineering
Keywords: High stress soft rock Coupling Support Self-stabilizing invisible arch
CLC: TD353
Type: Master's thesis
Year: 2008
Downloads: 546
Quote: 6
Read: Download Dissertation

Abstract

Many mines in western China, high stress soft rock has become the key constraints of the the mine technology development and production safety. Thus, the stability of the high stress soft rock and combined support technology, with very great theoretical significance and value of engineering practice. On the basis of the extensive literature reference discusses suitable for high stress soft rock roadway surrounding rock deformation control anchor, net, rope spray coupling support theory, with the FLAC3D Software theoretically achieve a cross-sectional shape and in-situ stress fully coupled surrounding rock steady state analysis comparing the cross-sectional shape and the coupling of the in-situ stress to give full play to the self-stability of the surrounding rock is the most effective method. But impossible to achieve in the actual design of the roadway cross-section shape and in-situ stress fully coupled, so as far as possible during the design of the roadway roadway in the the longer radial direction along situ stress in the direction of the maximum principal stress, re-use anchor net, rope and shotcrete support in key positions to make up. This paper discusses the self-stabilizing invisible arch of the basic principles of the theory as well as in high stress soft rock roadway use the FLAC software to simulate the formation of the the invisible arch of self-stabilizing, summed up the anchor rod design basis (cable), combined with The theory and high stress soft rock roadway surrounding rock deformation controlled anchor, network, cable, spray coupling support theory, 3504 the Tongchuan Mining Kinkasan Mine on trough engineering background, through on-site research, observations, sampling calculation optimization design its cross-sectional shape, size and support parameters to improve the deficiencies of the original support and the FLAC3D software as the basis for the establishment of three-dimensional numerical model, the use of FISH in control excavation, to stepping foot 0.8m 30 steps to complete 24m long test section, with the fight between the bolt consider stress release after completion of each excavation step, to achieve practical engineering excavation time difference between playing bolt. To simulate the force tunneling on the Bolt, boring deformation of surrounding rock, the tunneling process in the same section at the surrounding rock. The simulation results show that the effect of optimal design, and verify the reasonableness of the optimal design. Numerical simulation of bolt force tunneling process, draw the force of the bolt with the roadway excavation variation, explained the beginning of tunneling in the the arched waist anchor and the roadway between two anchor deeper mainly for the cause of the pressure. Numerical simulation of the impact on the surrounding rock tunneling support of surrounding rock displacement and stress changes have a preliminary knowledge and understanding, reached a high stress soft rock roadway surrounding rock deformation mechanism. By tunneling the numerical simulation of the impact of surrounding rock of the same section, draw the tunneling support have a greater impact on the surrounding rock and has been supporting surrounding rock and supporting structure for the interaction of a relatively stable period of time. And supporting design of a numerical simulation analysis, the follow-up on-site support experimental instructive conclusions rapid production have a role to further improve the Jinhua mine support, to improve the safety of the mine.

Related Dissertations

CLC: > Industrial Technology > Mining Engineering > Mine the pressure and support > Mine support equipment > Roadway support
© 2012 www.DissertationTopic.Net Mobile