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Study on Surface Consolidation Settlement of Shield Tunnel

Author: ChenWeiJun
Tutor: WeiXinJiangï¼›WeiGang
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Shield Tunnel Workers consolidation settlement Initial excess pore water pressure Leakage Constant free stream
CLC: U456.3
Type: Master's thesis
Year: 2011
Downloads: 95
Quote: 2
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Abstract


Tunnel Worker consolidation settlement of two parts , divided into the settlement as well as the work of tunnel construction and long-term settlement is a major problem currently plaguing scholars . Shield tunnel surrounding soil deformation studies , specifically from the empirical method , analytical method and numerical method of shield tunnel construction , shield tunnel workers after the two parts are summarized , and highlighted the lack of research at settlement after focus on the areas that need research topics and new research ideas . The number of monitoring instances of excess pore water pressure caused by the existing shield construction analysis , the excess pore water pressure generation and dissipation of the law . Pointed out the defects of the excess pore water pressure monitoring . Measured excess pore water pressure dissipation settling time is short , when the peak of excess pore water pressure , the excess pore water pressure is within the sphere of influence of any point distribution issues . The use of stress relief and stress transfer theory, the formula derived any point of the soil within the sphere of influence of initial excess pore water pressure . The analysis showed that : the initial excess pore water pressure of the soil points concave curve decay with increasing radial distance from the tunnel center . The tunnel depth , shield diameter soil initial excess pore water pressure . When the the shield diameter decreases or tunnel depth increases , will make lining adjacent initial excess pore water pressure in the tunnel at the bottom of the soil initial excess pore water pressure tunnel center horizontal line at the soil more obvious differences . Tunnel Worker consolidation settlement is divided into two parts , the pore pressure consolidation settlement and tunnel seepage consolidation settlement due to the dissipation . Consolidation settlement above the tunnel axis at the surface due to the dissipation of pore water pressure caused , not only to consider the top of the tunnel - the party of soil , should be considered the tunnel at the bottom of the soil pore water pressure dissipation caused by the consolidation settlement . Fluid dynamics theory fissures exist constant free stream , the result of consolidation settlement . Seen by a numerical example , the calculation method is more in line with the measured values ??, can be better predicted shield construction due to soil settlement after .

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CLC: > Transportation > Road transport > Tunnel project > Tunnel observations and experimental > Tunnel construction and use of monitoring
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