一、Function
The instrument can not only measure the static lateral pressure coefficient K0 of soil, but also provide the relationship between the overconsolidation ratio and the value of K0 under unloading condition, and study the triaxial strength parameters under THE condition of K0, as well as the compression coefficient and compression modulus under the condition of constant strain. The instrument has two control modes of stress and strain, with color LCD touch screen for easy operation, and can record soil samples in real time during the experiment through the equipped data acquisition and processing software, and draw K0 real time curve.
二、Technical parameters
1. soil sample area 30cm2 (soil sample diameter φ61.8mm).
2. The soil sample height is 40mm, and the effective height of lateral pressure response is 30mm.
3. σ3 Max =0-600 kpa (accuracy greater than 0.3%).
4. σ1 Max = 0-800kpa (accuracy greater than 0.3%).
5. ε1max is 20%, that is, vertical deformation is not less than 8mm.
6. the permeability coefficient of upper and lower permeable stone is not less than N ×10-3 cm/s. Pressure chamber latex diaphragm should be transparent, anti-aging, thickness of about 0.4~0.5mm.
7. loading device output ≤8KN, displacement ≤80mm, loading rate 0.001~ 1mm/min (loading speed can be set according to user or experimental needs).
8. stress and strain two control modes.
9. double, can be tested on 2 samples at the same time.
三、Main configuration
1. sealed K0 container: by the hydraulic chamber, upper and lower permeable plate, pressure transmission piston, sealing ring, container base, latex thin film, two-way valve and so on.
2. Vertical loading system: it is composed of 32 bit ARM controller and stepper motor driving control system, loading platform, force column, reaction beam and so on.
3. sensor: pull pressure sensor (load) and pressure sensor (hydraulic) and transmitter composition.
4. Operating system composed of LCD touch screen: the input and output of the whole machine are all completed on the operating interface of LCD touch screen.
5. transmission system: the instrument is equipped with a universal network interface, through the network cable to connect with the user's computer, to achieve data transmission.
6. Software: It is equipped with data acquisition and processing software, which can record soil samples in real time during the experiment and draw K0 real time curve.
