Devices used in laboratories to measure horizontal displacement of soil around a foundation to be treated by vacuum preloading, and measurement methods
First Claim
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1. A device used in laboratories to measure horizontal displacement of soil around a region to be treated by vacuum preloading, comprising:
- a box with a top surface, a bottom surface and a peripheral side surface filled with soil, the soil being divided into a central soil region to be treated by vacuum preloading and a peripheral soil region surrounding the central soil region;
a vertical drainage board and a vacuum pumping tube being buried within the soil in the central soil region, a lower end of the vacuum pumping tube being connected to the vertical drainage board and an upper end thereof being connected to a vacuum pump;
a sealing membrane above a top soil surface of the central soil region;
a loading device above the sealing membrane to assist drainage;
transverse tubes horizontally inserted into and fixed relative to the peripheral side surface of the box, a part of the transverse tubes being in the peripheral soil region;
an annular sensing source which moves with the soil of the peripheral soil region and which is movable along the transverse tubes and is sleeved on the transverse tubes, wherein a foot is extended obliquely and outwardly from the annular sensing source, by which the soil of the peripheral soil region drives the annular sensing source to move when the soil of the peripheral soil region moves due to the vacuum preloading of the central soil region; and
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a position sensing instrument with a sensing head, wherein the sensing head is adapted to be inserted into the transverse tube from outside of the box, so that when the sensing head reaches position of the annular sensing source along the transverse tubes, an alarm signal is sent, and in this way, different positions of the annular sensing source along the transverse tubes at different moments of time are determined and horizontal displacement of the soil in the peripheral soil region is calculated.
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Abstract
A laboratory device to measure horizontal displacement of soil around a region treated by vacuum preloading includes a box injected with dredger fill. A vertical drainage board and a vacuum pumping tube are buried within soil in the treatment region in connection with a vacuum degree detector and a vacuum pump. A seal membrane covers soil in the treatment region. A loading device is above the seal membrane. Transverse tubes are inserted into a side of the box and in surrounding soil of the treatment region. An annular sensing source, which moves together with the soil and which is movable along the transverse tubes, sleeved on the transverse tubes. Each transverse tube is provided with a sensing instrument, and the sensing instrument is connected with a sensor is inserted into the transverse tube. The different positions of the sensing source at different moments of time are determined.
28 Citations
10 Claims
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1. A device used in laboratories to measure horizontal displacement of soil around a region to be treated by vacuum preloading, comprising:
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a box with a top surface, a bottom surface and a peripheral side surface filled with soil, the soil being divided into a central soil region to be treated by vacuum preloading and a peripheral soil region surrounding the central soil region; a vertical drainage board and a vacuum pumping tube being buried within the soil in the central soil region, a lower end of the vacuum pumping tube being connected to the vertical drainage board and an upper end thereof being connected to a vacuum pump; a sealing membrane above a top soil surface of the central soil region; a loading device above the sealing membrane to assist drainage; transverse tubes horizontally inserted into and fixed relative to the peripheral side surface of the box, a part of the transverse tubes being in the peripheral soil region; an annular sensing source which moves with the soil of the peripheral soil region and which is movable along the transverse tubes and is sleeved on the transverse tubes, wherein a foot is extended obliquely and outwardly from the annular sensing source, by which the soil of the peripheral soil region drives the annular sensing source to move when the soil of the peripheral soil region moves due to the vacuum preloading of the central soil region; and
;a position sensing instrument with a sensing head, wherein the sensing head is adapted to be inserted into the transverse tube from outside of the box, so that when the sensing head reaches position of the annular sensing source along the transverse tubes, an alarm signal is sent, and in this way, different positions of the annular sensing source along the transverse tubes at different moments of time are determined and horizontal displacement of the soil in the peripheral soil region is calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification
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Current AssigneeWenzhou University
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Original AssigneeWenzhou University
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InventorsWang, Jun, Cai, Yuanqiang, Fu, Hongtao, Shi, Changxin, Wang, Peng, Ni, Junfeng, Fang, Ziquan
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Primary Examiner(s)Rogers, David A
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Application NumberUS15/712,689Publication NumberTime in Patent Office781 DaysField of SearchUS Class CurrentCPC Class CodesE02D 2250/0053 using suction or vacuum tec...E02D 2600/10 comprising sensor meansE02D 2600/20 comprising details of conne...E02D 3/10 by watering, draining, de-a...G01N 33/24 Earth materials G01N33/42 t...
