응력에 따른 흙수분 곡선 stress dependent soil water characteristic curve

 

응력에 따른 흙수분 곡선 stress dependent soil water characteristic curve

 

 

영신컨설턴트 (02) 529 8803 ystcha@naver.com 2020 3

 

 

기존의 pressure plate extractor 방법에 의한 흙수분 곡선은 외부 응력이 없는 단점이 있습니다. 단점을 보완한 기존 CRS cell 압밀셀에 연직과 구속 상태의 흙수분 곡선 장치로 부품을 바꾸면 CRS시험 장치로 변경 가능합니다.

 

 

가능시험   압밀시험 One dimensional consolidation, Constant rate of Loading (CRL), Constant rate of strain (CRS), Multi-stage Testing, Quasi-static low speed/creep tests, ramp and cycle pressure or volume change, saturation, Stepped loading, Matric suction control,   흙수분 곡선 Stress Dependant Soil Water Characteristic Curve (SDSWCC).

 

 

 

시험구성

 

load frame, pressure controller, CRS cell, HAEPD, 공기압 조절장치

 

load cell, displacement, pore pressure

 

Back Pressure/Axial Load (MPa/kN) 구속압력과 축하중:	1/50, 3/50, 20/100
Sample Sizes (mm) 시료 크기:	30mm to 150mm (1 and 3MPa version), 38mm to 50mm (20 MPa version)
Max Matric suction (HAEPD kPa):	500 or 1500
Direct control of both Matric Suction and Axial Stress:	unsaturated soil behaviour is governed by two independent stress state variables, i.e. net stress and matric suction (Fredlund and Morgenstern, 1977).
Axis translation technique:	Matric suction is controlled up to either 500kPa or 1500kPa (depending on the air entry value chosen) by controlling pore air and pore water pressure directly.
Fully controllable axial load / stress  / displacement/strain:	The Stress Dependant Soil Water Characteristic Curve (SDSWCC) is possible due to the precise control over the axial stress. This poses an advantage over the traditional pressure plate extractor in which no external stress is applied and volume change of the soil specimen is assumed to be zero.
Fixed ring K0 conditions:	K0 conditions ensure there is no lateral deformation, therefore sample volume can be calculated directly from the axial deformation recorded.

 

 

등방 응력에 따른 흙수분 곡선