Abstract:
PURPOSE: A sealing packer for a rock bolt filler using a foaming material, a sealing method of a rock bolt hole using such a sealing packer, and a constructing method of a rock bolt are provided to prevent a rock bolt from falling due to own weight since when the rock bolt is installed on a installation hole for installing the rock bolt after the hole is formed on the ground, the rock bolt is stably supported. CONSTITUTION: A sealing packer for a rock bolt filler using a foaming material comprises a packer body, a first foaming agent and a second foaming agent. The synthetic-resin coated aluminum foils of the front and rear sides of the packer body are thermally-bonded to form an inner space. The inner space of the packer body is divided into two areas by an inner partition line(22), which is formed by the thermal bonding. The first foaming agent and the second foaming agent are respectively filled in the two areas of the inner space of the packer body. The first and second foaming agents are mixed and form a foaming body.
Abstract:
유한요소법은 초기에 구성된 요소집합체에 시간변화에 따라 경계조건을 설정하고 요소방적식을 풀어 해를 구하는 것이 일반적인데, 본 발명은 물체의 일부가 시간에 따라 제거되는 현상을 유한요소해석 함에 있어서, 그 결과의 정확도를 기하기 위해 시간의 변화에 따라 요소의 제거를 구현하고, 제거된 요소에 의해 바뀌는 경계조건 변화를 고려하는 알고리즘에 관한 것이다. 본 발명은, 방정식 을 사용하여 모델 전체의 변위, 온도 또는 수두분포( )를 초기화시키는 1단계;와 시간 에 대한 경계조건을 보간법으로 계산하는 2단계;와 시간 에 대한 경계조건으로 방정식 을 사용하여 선형해석 또는 방정식 를 사용하여 비선형해석(반복수만큼 해석)하는 3단계;와 상기 해석에 의해 요소에 계산된 시간 에서의 변위, 온도 또는 수두( )를 기준 강도, 온도 또는 변형량( )과 비교하 는 4단계;와 상기 해석에 의해 요소에 계산된 시간 에서의 변위, 온도 또는 수두( )가 기준 강도, 온도 또는 변형량( )보다 큰 경우 요소를 파괴하여 경계를 변화시키는 5단계;와 상기 해석에 의해 요소에 계산된 시간 에서의 변위, 온도 또는 수두( )가 기준 강도, 온도 또는 변형량( )보다 작은 경우 해당 경계를 유지하는 6단계;와 상기 4단계 내지 6단계를 전체요소에 대하여 수행하는 7단계; 및 2단계 내지 7단계를 전체시간까지 수행하는 8단계로 이루어지는 파괴요소를 이용한 경계조건변화 알고리즘을 제공한다. 유한요소법, 파괴요소, 경계조건, 보간법, 유한요소
Abstract:
PURPOSE: A boundary condition change algorithm by a rupture element according to the flow of time is provided to improve accuracy about result interpretation even though the analysis is time-dependent interpretation. CONSTITUTION: A boundary condition change algorithm by a rupture element according to the flow of time is as follows. The displacement of a model, a temperature or distribution is initialized by using an equation. A boundary condition about the time is calculated through an interpolation method. The boundary condition about the time is linearly interpreted by using an equation.
Abstract:
PURPOSE: A liquid accelerator compositions for shotcrete and the shotcrete comprising the same are provided to exhibit excellent quick-setting and bonding properties as well as long-term intensity. CONSTITUTION: A liquid accelerator compositions for shotcrete comprises 5-15wt% of metakaolin, 30-40wt% of aluminium sulfate, 1-5wt% of amines, 3-10wt% of aluminium hydroxide, 4-10wt% of hydrofluoric acid, 0.5-2wt% of dispersing agent, and the remainder of water.
Abstract:
An apparatus and a method for testing a section for a tunnel lining are provided to perform a load teat under a state that a section sample simulating a partial period of a practical tunnel lining has the same condition as a boundary condition at the practical tunnel lining period. An apparatus(100) for testing a section for a tunnel lining includes a section sample(1), a jig unit(10), a load device(30), and a measurement device(40). The section sample is manufactured so as to have the same shape and material property of a partial period of the practical constructed tunnel lining. Both boundary unit of the section sample become a fixing terminal in a vertical direction and a moving terminal in a horizontal direction. The jig unit is attached to both ends of the section sample to prevent both ends of the section sample from moving in vertical direction. The load device applies a horizontal load to the section sample through the jog device. And, the measurement device measures a structure behavior of the section sample such as a stress, a displacement or a deformation of the section sample deformation generated at the section sample when the vertical load is applied to the section sample.