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Study on the Small Duct Pre-supporting Technology of Tunnel in the Shallow Broken Rock Sections

Author: FanYongHui
Tutor: DaiJun
School: Xi'an University of Science and Technology
Course: Bridge and Tunnel Engineering
Keywords: Tunnel Forepolling principle The small conduit advance guard Displacement
CLC: U455.49
Type: Master's thesis
Year: 2011
Downloads: 32
Quote: 0
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Abstract


In a lot of shallow broken rock tunnel boring , in order to overcome the poor strata stability of the adverse effects of the tunnel construction , it is often required before excavation work in front of square strata to impose Forepolling to guarantee the stability of surrounding rock . The subject on the basis of existing research in related fields , to carry out the shallow broken rock tunnel the small catheter Forepolling technology research , the main contents and conclusions are as follows : ( 1 ) describe the characteristics of tunnel surrounding rock strata conditions shallow broken , pointed out that the shear strength of the broken rock is mainly affected by the weak structural planes or weak interlayer control ; (2) analysis of the small catheter Forepolling reinforcement mechanism and the role of effect that can improve the work ahead of surrounding rock stress state Forepolling , improve stability of surrounding rock . Series and parallel model through the establishment of a small catheter Forepolling system , you can clear Forepolling relationship between each unit , only when the optimal matching between each unit , the entire system can play the best effect ; ( 3 ) of the tunnel Forepolling principle of in-depth study , Forepolling force composed by the surrounding rock self-supporting capacity and supporting structure bearing capacity , it is the bearing capacity of the structural system of tunnel surrounding rock - support to guarantee the stability of the tunnel surrounding rock the Forepolling force should always be greater than the pre-construction to maintain the stability and balance of the original rock mass internal forces ; ( 4) to compare different working conditions of the vertical displacement of the dome , the small pipe grouting support in controlling crown settlement , to maintain the stability of surrounding rock played an important role . Further explore the small catheter diameter hoop spacing , grouting pipe length , step excavation , tunnel depth the factors on the small catheter Forepolling effect of the following conclusions : ( 1 ) in the pipe grouting case , regardless of changing the diameter and length of the tube or ring vault vertical and horizontal displacement of spandrel spacing is not large ; ② small duct grouting tube length there is a reasonable length ; ③ the depth of the same tunnel , tube Note the pulp length dome displacement is limited , when the depth increases to a certain value the small catheter Forepolling not meet the requirements to control the surrounding rock deformation , the need to improve small catheter Forepolling parameters or alternative support protection mode.

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CLC: > Transportation > Road transport > Tunnel project > Tunnel construction > Construction methods > Adverse geology, underwater tunnel construction helper method
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