US 11,913,186 B2
In-situ test system and method for subgrade dynamic resilient modulus
Jianlong Zheng, Changsha (CN); Junhui Zhang, Changsha (CN); and Junhui Peng, Changsha (CN)
Assigned to CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY, Changsha (CN)
Appl. No. 17/617,451
Filed by CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hunan (CN)
PCT Filed Aug. 29, 2020, PCT No. PCT/CN2020/112297
§ 371(c)(1), (2) Date Dec. 8, 2021,
PCT Pub. No. WO2021/077899, PCT Pub. Date Apr. 29, 2021.
Claims priority of application No. 201911008905.2 (CN), filed on Oct. 23, 2019.
Prior Publication US 2022/0298737 A1, Sep. 22, 2022
Int. Cl. E02D 1/00 (2006.01); G01N 3/36 (2006.01); G01D 5/14 (2006.01); G01S 19/01 (2010.01)
CPC E02D 1/00 (2013.01) [G01D 5/14 (2013.01); G01N 3/36 (2013.01); G01S 19/01 (2013.01)] 17 Claims
OG exemplary drawing
 
1. An in-situ test system for a subgrade dynamic resilient modulus, comprising a loading module (1), a data collecting module (2) and a data processing module (3); wherein,
the loading module (1) comprises a test vehicle (5), a servo cylinder (9) is mounted on the test vehicle (5), a piston rod of the servo cylinder (9) is connected with a bearing plate (12) acting on a subgrade surface, an annular loading plate (22) is disposed around the bearing plate (12), the bearing plate (12) is located in the center of the loading plate (22), and the loading plate (22) is connected, through a force transmission rod (20), with a bearing tray (19) on which a counterweight block (18) is placed;
the data collecting module (2) comprises a second high precision displacement sensor (34) and a plurality of first high precision displacement sensors (29), the second high precision displacement sensor (34) is mounted at the center of the bottom of the bearing plate (12), the first high precision displacement sensors (29) are mounted on an upper surface of the loading plate (22) and test points of the subgrade surface respectively, the test points of the second high precision displacement sensor (34) and all the first high precision displacement sensors (29) are on a same straight line, all the first high precision displacement sensors (29) are mounted on a cross beam (32), and the cross beam (32) is mounted on the test vehicle (5) through a lifting device;
the data processing module (3) comprises a computer (7), the computer (7) is connected with a signal input end of the servo cylinder (9), an output end of the first high precision displacement sensor (29) and an output end of the second high precision displacement sensor (34) respectively, and the computer (7) is used to set a loading waveform, a load size, a loading frequency and a number of loading times of a pre-applied vehicle load of the servo cylinder (9), receive a resilient deformation displacement value tested by the second high precision displacement sensor (34) and the first high precision displacement sensor (29), and perform inverse calculation for a dynamic resilient modulus value of a subgrade using a software.