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equivalent longitude
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     Research methods:Load release factor and equivalent longitude stiffness factor are introduced with the object of Youjiazhuang to Nankangcun subway section in the Xi′an metro line-2.Paper adopted 3D FEM in the research of ground sectional groove and longitude settlement curve distribution,varying laws conducted by parallel shield tunnel construction are also included.
     研究方法:以西安地铁二号线尤家庄至南康村区间盾构隧道研究对象,引入荷载释放系数和等效刚度系数,采用三维有限元法对平行盾构隧道施工引起地表横向沉降槽和纵向沉隆曲线分布及变化规律进行了研究。
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  equivalent longitude
Their equivalent longitude is obtained from the plane of the joint and considering the peculiar geometry of the screw.
      


Research purposes: In order to clarify influences of restrictive factors on the ground settlement and up-heal displacement distribution and varying law.Research methods:Object of shield tunnel test section in a certain city with subway construction in plan was adopted in this paper.With the application of load release factor and equivalent longitude stiffness factor,3D FEM was carried out in the research of ground sectional groove and longitude settlement curve caused by shield tunnel construction.Research...

Research purposes: In order to clarify influences of restrictive factors on the ground settlement and up-heal displacement distribution and varying law.Research methods:Object of shield tunnel test section in a certain city with subway construction in plan was adopted in this paper.With the application of load release factor and equivalent longitude stiffness factor,3D FEM was carried out in the research of ground sectional groove and longitude settlement curve caused by shield tunnel construction.Research results:Influences of factors as surrounding soil condition,tunnel bury depth and advance force on the ground movement caused by shield tunnel construction was brought out,3D curves were also exerted in the discussion of ground settlement space distribution and varying law.Research conclusions:Surrounding soil condition illness,tunnel bury depth lessen and advance force enhancement could also result in augmentation of ground settlement and up-heal displacement during construction,suggestions as advance force adjustment during tunnel construction for the reduction of ground environment influences are also brought forwarded in this paper.

研究目的:探明盾构隧道施工中各制约因素取值差异对地表沉隆变位分布规律的影响。研究方法:本文以某拟建地铁城市区间盾构隧道试验段为研究对象,引入荷载释放系数和纵向等效刚度系数,采用三维有限元法对盾构隧道施工引起的地表横向沉降槽和纵向沉隆曲线进行了研究。研究结果:揭示了围岩条件、隧道埋深和顶推力等因素变化对盾构隧道施工引起地表沉隆变位的影响,运用三维曲线探讨了盾构隧道施工过程中的地表沉隆变位曲线空间分布变化规律。研究结论:围岩条件恶化、隧道埋深减小和顶推力增大都将导致施工引起地表沉隆变位影响的加剧,建议工程施工中采取调整顶推力等措施以降低施工对地表环境的影响。

Research purposes: Aims at the ground movement distribution and transformation during parallel shield tunnel construction,infections on the ground movement value due to effective factors(such as surrounding soil condition,tunnel covering thickness,clear distance and advance force etc) are also probed in.Research methods:Load release factor and equivalent longitude stiffness factor are introduced with the object of Youjiazhuang to Nankangcun subway section in the Xi′an metro line-2.Paper adopted 3D FEM...

Research purposes: Aims at the ground movement distribution and transformation during parallel shield tunnel construction,infections on the ground movement value due to effective factors(such as surrounding soil condition,tunnel covering thickness,clear distance and advance force etc) are also probed in.Research methods:Load release factor and equivalent longitude stiffness factor are introduced with the object of Youjiazhuang to Nankangcun subway section in the Xi′an metro line-2.Paper adopted 3D FEM in the research of ground sectional groove and longitude settlement curve distribution,varying laws conducted by parallel shield tunnel construction are also included.Research results:Infections of diversities as surrounding soil condition,tunnel covering thickness,advance force and tunnel clear distance,etc on the ground movement value are also probed in this paper,void variations of ground settlement and up-heal during tunnel construction are also discovered by 3D curves.Research conclusions:The surrounding soil condition illness,tunnel covering depth lessen,advance force increscent and clear distance shortness could also result in ground movement enhancement induced by sectional parallel shield tunnel construction.Advises as advance force adjustment and clear distance increscent during parallel shield tunnel construction for the reduction of ground environment influences are also suggested in this paper.

研究目的:探明平行盾构隧道施工引起地表沉隆变位分布变化规律,及各制约因素(如围岩条件、隧道埋深、隧道净距、顶推力等)的差异对地表沉隆变位量的影响。研究方法:以西安地铁二号线尤家庄至南康村区间盾构隧道研究对象,引入荷载释放系数和等效刚度系数,采用三维有限元法对平行盾构隧道施工引起地表横向沉降槽和纵向沉隆曲线分布及变化规律进行了研究。研究结果:揭示了围岩条件、隧道埋深、顶推力、隧道净距等因素差异对平行盾构隧道施工引起地表沉隆变位的影响,运用三维曲线探讨得出平行盾构隧道施工过程中的地表沉隆变位曲线空间分布变化规律。研究结论:围岩条件恶化、隧道埋深降低、顶推力加大、净距减小等都将导致平行盾构隧道施工引起地表沉隆变位量的增大,建议工程施工中采取调整顶推力、适当增大隧道净距等措施以降低平行盾构隧道施工对地表环境的影响。

 
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