토피고가 낮고 지반의 자립성이 낮은 토사층, 풍화암층에서 시공되는 터널 구조물의 경우, 시공중 붕락을 방지하고 단기적인 안정성을 확보하기 위해서 보조공법들이 사용되는데 특히, 터널의 보강과 차수효과를 동시에 얻을 수 있는 강관 다단 그라우팅 공법(Umbrella Arch Method)이 많이 적용되고 있다. 그러나, 국내에서는 아직 본 공법의 적용에 있어 외국자료나 경험적 방법에 의한 설계 및 시공이 이루어지고 있는 실정임을 감안할 때, 합리적이고 이론적인 설계 및 해석기법의 도입이 이루어져야 할 필요가 있다. 본 연구에서는 강관 다단 ...
토피고가 낮고 지반의 자립성이 낮은 토사층, 풍화암층에서 시공되는 터널 구조물의 경우, 시공중 붕락을 방지하고 단기적인 안정성을 확보하기 위해서 보조공법들이 사용되는데 특히, 터널의 보강과 차수효과를 동시에 얻을 수 있는 강관 다단 그라우팅 공법(Umbrella Arch Method)이 많이 적용되고 있다. 그러나, 국내에서는 아직 본 공법의 적용에 있어 외국자료나 경험적 방법에 의한 설계 및 시공이 이루어지고 있는 실정임을 감안할 때, 합리적이고 이론적인 설계 및 해석기법의 도입이 이루어져야 할 필요가 있다. 본 연구에서는 강관 다단 그라우팅 공법을 적용한 NATM 현장에서 계측을 통해 터널 굴착에 따른 강관의 거동을 분석하고, UAM 설계시에 적용할 수 있는 하중계를 제안하였다. 그리고, 제안된 하중계를 바탕으로 실제 현장에서 적용할 수 있는 UAM의 설계지침 즉, 강관길이, 중첩시공거리, 횡방향 설치간격 등을 결정할 수 있는 설계법을 제안하였다.
토피고가 낮고 지반의 자립성이 낮은 토사층, 풍화암층에서 시공되는 터널 구조물의 경우, 시공중 붕락을 방지하고 단기적인 안정성을 확보하기 위해서 보조공법들이 사용되는데 특히, 터널의 보강과 차수효과를 동시에 얻을 수 있는 강관 다단 그라우팅 공법(Umbrella Arch Method)이 많이 적용되고 있다. 그러나, 국내에서는 아직 본 공법의 적용에 있어 외국자료나 경험적 방법에 의한 설계 및 시공이 이루어지고 있는 실정임을 감안할 때, 합리적이고 이론적인 설계 및 해석기법의 도입이 이루어져야 할 필요가 있다. 본 연구에서는 강관 다단 그라우팅 공법을 적용한 NATM 현장에서 계측을 통해 터널 굴착에 따른 강관의 거동을 분석하고, UAM 설계시에 적용할 수 있는 하중계를 제안하였다. 그리고, 제안된 하중계를 바탕으로 실제 현장에서 적용할 수 있는 UAM의 설계지침 즉, 강관길이, 중첩시공거리, 횡방향 설치간격 등을 결정할 수 있는 설계법을 제안하였다.
In the case of tunnel structure construction in places where there is shallow soil cover, cohesionless soil and weathered rocks,reinforcement methods are used to prevent the collapse of rock structure and to guarantee the short term tunnel stability. Umbrella Arch Method (UAM) which can provide tunn...
In the case of tunnel structure construction in places where there is shallow soil cover, cohesionless soil and weathered rocks,reinforcement methods are used to prevent the collapse of rock structure and to guarantee the short term tunnel stability. Umbrella Arch Method (UAM) which can provide tunnel reinforcement and water cut-off is generally used. But up to the present actual circumstances regarding the design and construction of this method has not been published both in local and international paper.There is a need for the rational and theoretical design and analysis of this method to be introduced. In this study, behaviour of the steel pipes with the tunnel excavation was analyzed through the monitoring of the UAM reinforced NATM jobsite and an appropriate load mechanism for the UAM design was proposed. Using the proposed load mechanism as a basis, a design guideline that can be used in the field together with the design method that can be used in the determination of steel pipe length ( L_(e), L_(b)), overlapping length(x), and the horizontal spacing was proposed. The following conclusions were obtained from this study 1)Based on the analysis of the steel pipe behaviour obtained from the field monitoring, the load mechanism obtained from the load magnitude and distribution on the steel pipe with the tunnel excavation shown in Fig.4.13 was proposed. The proposed load mechanism is fixed on one end and roller on one end and the overburden earth pressure is applied at an angle equal to the steel pipe installation angle. 2)From the proposed load mechanism,the length (Eq.5.2and 5.4)and superimposed length (Eq.5.10) of steel pipe to be used in the design can be recommended. The design is determined when the conditions of Eq.5.1 is satisfied and soil properties, tunnel cross-section,horizontal spacing of steel pipes, diameter of steel pipes and other factors can be considered in the design. 3)In determining the steel pipe length and superposed length, the reduction in the load applied on the steel pipe due to steel pipe's superposed length, the core left during the steel pipe installation and the steel rib installed with the tunnel installation should be considered(Fig.5.14and5.15). 4)In this study, it was verified that the result of the proposed UAM design method and field construction cases are similar. 5)The design method proposed by the Korean Institute of Construction Technology (KICT)(1998) and Fizzarotti (2001) is different from the proposed design method in this study since the steel pipe installation angle is also be considered which makes it a design method similar to actual condition.
In the case of tunnel structure construction in places where there is shallow soil cover, cohesionless soil and weathered rocks,reinforcement methods are used to prevent the collapse of rock structure and to guarantee the short term tunnel stability. Umbrella Arch Method (UAM) which can provide tunnel reinforcement and water cut-off is generally used. But up to the present actual circumstances regarding the design and construction of this method has not been published both in local and international paper.There is a need for the rational and theoretical design and analysis of this method to be introduced. In this study, behaviour of the steel pipes with the tunnel excavation was analyzed through the monitoring of the UAM reinforced NATM jobsite and an appropriate load mechanism for the UAM design was proposed. Using the proposed load mechanism as a basis, a design guideline that can be used in the field together with the design method that can be used in the determination of steel pipe length ( L_(e), L_(b)), overlapping length(x), and the horizontal spacing was proposed. The following conclusions were obtained from this study 1)Based on the analysis of the steel pipe behaviour obtained from the field monitoring, the load mechanism obtained from the load magnitude and distribution on the steel pipe with the tunnel excavation shown in Fig.4.13 was proposed. The proposed load mechanism is fixed on one end and roller on one end and the overburden earth pressure is applied at an angle equal to the steel pipe installation angle. 2)From the proposed load mechanism,the length (Eq.5.2and 5.4)and superimposed length (Eq.5.10) of steel pipe to be used in the design can be recommended. The design is determined when the conditions of Eq.5.1 is satisfied and soil properties, tunnel cross-section,horizontal spacing of steel pipes, diameter of steel pipes and other factors can be considered in the design. 3)In determining the steel pipe length and superposed length, the reduction in the load applied on the steel pipe due to steel pipe's superposed length, the core left during the steel pipe installation and the steel rib installed with the tunnel installation should be considered(Fig.5.14and5.15). 4)In this study, it was verified that the result of the proposed UAM design method and field construction cases are similar. 5)The design method proposed by the Korean Institute of Construction Technology (KICT)(1998) and Fizzarotti (2001) is different from the proposed design method in this study since the steel pipe installation angle is also be considered which makes it a design method similar to actual condition.
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