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| Research on the Settlement Control of Subway Shield Undercrossing Railway Subgrade in Ningbo Area |
| WANG Kun |
| (TheThird Railway Survey and Design Institute Group Corporation，Tianjin 300251，China) |
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Abstract Abstract:Research purposes: Based on the numerical simulation and Peck - empirical formula，it is concluded that the coefficient reference value of soil settlement trough caused by shield construction. For analyzing the settlement control of subway shield undercrossing railway subgrade， the engineering of shield pass through Ningbo - Taizhou - Wenzhou railway is considered. By the method of three - dimensional numerical simulation，the settlement discipline are put forward when shield travel across the subgrade reinforced area，half - reinforced area and unreinforced area. It can provide theoretical reference for the similar projects in this region. Research conclusions:( 1)The soil of Ningbo area can be summarized as silt soil，clay，silty and sand soil. The value of K and the width of settlement trough are decreasing in turn caused by shield construction disturbance， but the maximum settlement value is creasing in turn. (2 ) By the way of linear regression fit，the initial sensitive factor and the depth sensitive factor are first defined. With the increasing depth of the shield，the former effects gradually weakened， and the latter effects gradually increased. When the depth is sufficiently large，the deformation tends to be consistent. The shield should avoid crossing half - reinforced area，if tlie subgrade has been reinforced. In the area of reinforced part or unreinforced part，the subgrade deformation，that coming from the disturbance of shield construction，decreases with increasing depth. The settlement curve changes slowly in unreinforced part of the reinforced subgrade. (4) This paper provides a theoretical basis for the optimization of subway shield undercrossing railway subgrade and safety shield construction in soft soil area, with a strong reference for similar projects.
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Received: 02 March 2017
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2017, Vol. 34 
