배압 간극수압 조절 직접 전단기 Back Pressured Shear box

 

배압 간극수압 조절 직접 전단기 Back Pressured Shear box

 

영신컨설턴트 (02) 529 8803 ystcha@naver.com 2020.4

 

 

간극수압 구속압 수평진동을 가할 수 있는 전단시험기

 

 

사면해석에서 강우나 지하수위 변화로 사면의 유효응력이 변할 때 간극수압, 배압, 수직응력을 back pressure shear box로 조절할 수 있습니다.

 

 

          

 

 

Dynamic Back Pressure Shearbox

Axial Force Accuracy

24bit ( i.e. <0.4N for 10kN load cell, <1.5N for 40kN load cell)

Computer Interface USB

Dimensions 1200mm (H) x 500mm (L) X 770mm (W),

Load Range (kN) Normal force 25kN, Shear force 10kN

Operating Frequency (Hz) 5Hz

Power 240V or 110V 50/60Hz 1 ph

Pressure Range (MPa) 2MPa back pressure

Resolution of Measurement and Control 10MHZ

Sample Sizes 50mm square, 75mm square (custom sizes available on request).

Sample height = 20mm.

Weight Approx (kg) 160

 

 

 

 

 

 

간극수압 가스압력 시료 중앙 하단으로 공급

 

 

 

 

 

 

시험요약

 

 

 

 

시험결과 수직유효응력, 전단응력

 

 

 

 

 

간극수압 증가 시 수평변형 증가

 

 

 

 

 

유효응력이 증가 시 전단속도 감소

 

 

 

 

 

가스압력 (PGB) 와 간극수압 (PWP) 증가 시 수평변형 증가

 

 

 

 

 

유효응력 증가 시 수평변형 감소

 

 

 

 

 

수평진동 DYN = Dynamic stress controlled shear test

 

DYN 5 +/-5kPa, DYN 10 +/-10kPa 진동시 수평변형

 

 

 

 

 

DYN 5 +/-5kPa, DYN 10 +/-10kPa 진동 시 수평변형속도

 

 

 

 

Peteris Skels and Kaspars Bondars from the Riga Technical University (RTU) set out to examine slope stability and landslide triggering mechanisms in colluvial soil in deep river valley slopes. 

Most of the landslides in Latvia evolve in deep river valleys after heavy consecutive rainfall in Autumn or rapid snowmelt in Spring (Latvian Geological Survey, 2003).

The change in ground water flow and levels effect, the stress state in the soil and creates seepage pressure. Soil is divided into saturated and unsaturated zones. Unsaturated soil parts after water infiltration or exfiltration, intense rainfall or melting snow can lead to the soil becoming saturated, thus the pore pressure will increase and the effective normal stress will be reduced, therefore reducing the shear resistance. However, it is important not only to evaluate ground water fluctuations and pore pressure changes, but also other factors such as slope topography, soil stratigraphy and geomorphology.

 

 

기존방법과 배압 간극수압 조절 전단시험 비교

 

the results from conventional direct shear and HPBSA tests

 

High Pressure Back Pressure Shear