Ko test (정지토압 압밀, Consolidation, 배수량측정)

Ko test

Younhshin consultant 2018 Dec. 7  

ystcha@naver.com  (02) 529 8803

Ko Consolidation Module 정지토압상태 압밀 방법

Ko 시험시 laodcell docking이 필요하지 않으면 docking 길이만큼 변형으로 인식.

 

Available Tests 가능시험
• Test 1: Kzero using ramp RADIAL STRESS with direct radial transducer measurement:
Uses a direct reading of the specimen diameter to enable the test control to maintain zero diameter change. 수평변위 측정하는 장치가 부착된 경우 직경 증가 없이 구속응력 증가

control
volume of the specimen diameter
= back volume change measurement
= sample area x axial external displacement

• Test 2: Kzero using ramp RADIAL STRESS with back volume change measurement:

Uses the change in volume of the specimen to calculate a theoretical new specimen height thus ensuring the diameter change remains zero.

control

volume of the specimen diameter

= back volume change measurement

= sample area x axial external displacement

  

배수량 측정에 상응하는 시료 체적을 연직변형으로 증가하여 구속응력증가

 

Required Hardware 필요 하드웨어 장치

• Axial Load or Axial Deformation Control/Acquisition (i.e. Bishop and Wesley Cell + volume change control, Load Frame etc) 축하중 또는 축변형 제어/측정장치

• Radial Stress Control/Acquisition 구속압력 제어/측정장치

• Back Pressure and Volume Control/Acquisition 배압과 배수량 제어/측정장치

Optional Items

• Radial direct measurement device (i.e. Radial Hall Effect caliper) must be used when performing

“Kzero using direct radial transducer.” 선택 수평변위 측정장치

Test Procedure 시험절차(구매한 module 설정)

From the Add Test Stage panel from within the Station Test Plan window select the Test Control

Module: Kzero.dll

Add test stage, station test plan에서 test module “Kzero.dll” 선택

Click the Create New Test Stage button to open the test stage details form.

 

Test 1: Kzero using ramp RADIAL STRESS with direct radial transducer measurement 시료직경 측정과 배수량측정에 의한 정지토압 압밀

The Kzero using direct radial transducer setup screen (below) will display the current read values in yellow boxes. The test type (either by Direct Radial Transducer or Back Volume Change) is selected form the ‘Test Type’ drop down menu. The default test is Kzero using Direct Radial Transducer, as can be seen below.

Current read values appropriate to your test are displayed in yellow text boxes. Enter the required target value for Radial Stress and set the length of time to reach this target in minutes.

During the test, the axial displacement of the sample will be slowly adjusted thus ensuring the diameter of the specimen remains constant, where the sample diameter change is measured directly from a radial transducer. 시료직경을 측정하여 증가하지 않게

배수량에 상응하는 연직변형을 발생시킨다.

Click Next to proceed to the next stage (section 6.3.5) 

Test 2: Kzero using ramp RADIAL STRESS with back volume change measurement

배수량측정에 의한 정지토압 압밀

The Kzero using back volume change setup screen can be seen below.

Again, current read values appropriate to your test are displayed in yellow text boxes. Enter the required target value for Radial Stress and set the length of time to reach this target in minutes.

During the test, the axial displacement of the sample will be slowly adjusted thus ensuring the diameter of the specimen remains constant, where the specimen diameter change is calculated from the back pressure volume change.

Click Next to proceed to the next stage (section 6.3.5)

구속응력을 가하여 시료의 배수을 유발하고 배수량에 해당하는 연직변위량을 산정하여 수직변위을 유발시킨다.