Control Effect of Capsuled Grouting on Settlement While Shield Tunneling Underpass High Speed Railway Subgrade
The settlement deformation of high speed railway subgrade is an important factor affecting the operation safety.The construction of shield tunneling underpass existing high speed railway line can induce the settlement deformation of high speed railway subgrade.The effectiveness of bag grouting as an active control measure for high speed railway subgrade settlement was explored based on numerical simulation to control the settlement of high speed railway subgrade effectively.The results show that,the influence of the bag grouting body on the surrounding soil is local,and the equivalent plastic strain of the stratum increases with the increase of the buried depth of the grouting body,and the thickness of the plastic zone is usually less than 3.0 times of the expansion thickness of the grouting bag.The shallower the buried bag is,the more obvious the effect of expansion on the subgrade is uplift,and the uplift deformation curve 偶of subgrade surface conforms to the Gauss equation.The prediction model of subgrade settlement under the control measures of capsular grouting is put forward,which can guide the settlement control of shield tunneling under high speed railway subgrade.
high speed railwaysettlement deformation of subgradecapsuled groutingunderpass of shield tunnelingactive control measuressettlement prediction model
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