Experimental setup for measuring the vacuum degree and pore pressure at a point of soil mass in vacuum consolidated state and the test operation method thereof

Patent metadata

Field	Value
Publication number	US-11549227-B1
Application number	US-202117348787-A
Country	US
Kind code	B1
Filing date	Jun 16, 2021
Priority date	Jun 16, 2021
Publication date	Jan 10, 2023
Grant date	Jan 10, 2023

Abstract

An experimental setup for measuring the vacuum degree and pore pressure at a point of soil mass in vacuum consolidated state, including a connecting tube, the connecting tube includes an upper water storage tube, a middle tube, the middle tube is loaded with an upper experimental soil mass, the lower tube is loaded with a lower experimental soil mass, a water storage chamber is connected to a pumping mechanism, an intermediate inner chamber is connected to a negative pressure vacuum gauge, the inlet conduit is connected to a negative pressure vacuum gauge. Additionally, the present invention provides a test operation method. The device measures the vacuum degree of upper part of experimental soil mass by observing the reading in the negative pressure vacuum gauge.

First claim

We claim:

1. An experimental setup for measuring the vacuum degree and pore pressure at a point of soil mass in vacuum consolidated state, including a connecting tube, the connecting tube including an upper water storage tube, a middle tube, an intermediate inner chamber and a lower tube abutting each other,
wherein the middle tube is loaded with an upper experimental soil mass, the lower tube is loaded with a lower experimental soil mass, a filter membrane is arranged at the upper and lower ends of the soil masses in the middle tube and lower tube respectively, the filter membrane is pervious, the upper water storage tube stores distilled water, the lower tube is connected to a water storage chamber through an inlet conduit, the water storage chamber is connected to a pumping mechanism through an outlet conduit, a body of the water storage chamber is sealed, the intermediate inner chamber is connected to an upper negative pressure vacuum gauge, the inlet conduit is connected to a lower negative pressure vacuum gauge.

2. The experimental setup defined in claim 1 , wherein the upper water storage tube and lower tube are provided with a docking mechanism, the middle tube and lower tube are connected and driven in the soil mass to take the subsurface soil mass.

3. The experimental setup defined in claim 2 , wherein an intermediate inner chamber is arranged in an intermediate tube, an upper end of the intermediate tube is connected to the middle tube, and a lower end is connected to the lower tube.

4. The experimental setup defined in claim 3 , wherein the connecting tube is provided with a mounting base, the mounting base is provided with a negative pressure vacuum gauge, a water storage chamber and a pumping mechanism, the negative pressure vacuum gauge includes the upper negative pressure vacuum gauge and the lower negative pressure vacuum gauge, the mounting base includes a base, a spindle and a mounting rack, a sleeving hole of mounting rack is fitted over the spindle, moving up and down along the spindle, an unlockable lock bar is arranged at a sleeve joint of mounting rack and spindle, the lock bar is provided with a handwheel, the lock bar is rotationally connected to a locking tile in the sleeving hole through the mounting rack, the intermediate tube is fixed to the mounting rack, the upper negative pressure vacuum gauge is fixed to the mounting rack, the intermediate tube communicates with the upper negative pressure vacuum gauge through an upper channel on the mounting rack; the base is provided with an abutting port for abutting the lower tube, the abutting port is connected to a lower channel on the base, the water storage chamber, the lower negative pressure vacuum gauge and pumping mechanism are fixed to the base, the lower negative pressure vacuum gauge communicates with the lower channel, the outer end of the lower channel is connected to the water storage chamber, the water storage chamber is connected to the pumping mechanism.

5. A test operation method of the experimental setup for measuring the vacuum degree and pore pressure at a point of soil mass in vacuum consolidated state defined in claim 4 , including the following steps:
I. the middle tube and lower tube are connected in one, and then the middle tube and lower tube are installed on a boring machine, the soil sampling depth is approached by mud drilling, when the soil sampling depth is approached, the middle tube and lower tube are rapidly and continuously pressed in the predetermined depth of soil, and stopped for 3-5 minutes before the soil mass is pulled out;
II. when the middle tube is being separated from the lower tube, the soil mass therein is cut up into an upper test soil mass remaining in the middle tube and a lower experimental soil mass remaining in the lower tube, the filter membrane is disposed at the upper and lower ends of the middle tube respectively, the filter membrane is disposed at the upper and lower ends of the lower tube respectively, the lower end of the middle tube is connected to the upper end of the intermediate tube, the upper end of the lower tube is connected to the lower end of the intermediate tube, the lower end of the lower tube abuts the abutting port, the upper water storage tube is filled with equilong distilled water;
III. the pumping mechanism is actuated, if the reading of the negative pressure vacuum gauge is k 1 , the reading of the negative pressure vacuum gauge is k 2 , the reading of the pore pressure gauge is k 3 , and the heights of the upper experimental soil mass and lower experimental soil mass, are fixed at l, the attenuation law and specific attenuation value are analyzed by comparing the values of

k
1

-

k
2

l

and

k
2

-

k
3

l

.

6. The experimental setup defined in claim 1 , wherein a storage camera aligned with a negative pressure vacuum gauge dial is arranged outside the negative pressure vacuum gauge.

7. The experimental setup defined in claim 1 , wherein an electronic readout system is arranged outside the negative pressure vacuum gauge, the electronic readout system is connected to a computer, the computer records the data of the negative pressure vacuum gauge at any time.

8. The experimental setup defined in claim 7 , wherein an upper test soil mass is in a hard tube, the upper end and lower end of the upper test soil mass are covered with a filter membrane respectively, the upper test soil mass is sealed with distilled water, a distilled water tube is covered with a thin film to guarantee a vacuum environment.

9. The experimental setup defined in claim 8 , wherein an upper filter membrane of the upper test soil mass is connected to a pore pressure gauge, the pore pressure gauge is connected to the computer for reading.

Assignees

• Wang Peng
• Ge Xueyan
• Dong Quanyang
• Zhou Yang
• Yang Xiaotian
• Univ Wenzhou

Inventors

• Wang Peng
• Ge Xueyan
• Dong Quanyang
• Zhou Yang
• Yang Xiaotian

Classifications

• E02D1/027 Primary

  by investigating properties relating to fluids in the soil, e.g. pore-water pressure, permeability (sampling of groundwater E02D1/06) · CPC title

• G01N33/24 Primary

  Earth materials (G01N33/42 takes precedence) · CPC title