Application of Fiber Bragg Grating Strain Sensors to a Centrifuge Model of a Jacked Pile in Collapsible Loess

Modeling of Loess Soaking Induced Impacts on a Metro Tunnel Using a Water Soaking System in Centrifuge

“…It has a maximum capacity of 60 g-ton, an effective radius of 2 m, and a range of acceleration from 1 g to 200 g, and there are two model boxes with the dimensions of 700 mm × 360 mm × 500 mm and 500 mm × 360 mm × 400 mm, respectively. The requirement of conventional geotechnical tests could be satisfied by the current CTE [3]. There are two main ways for data acquisition: sensor acquisition and image capture acquisition.…”

“…When the saturation of undisturbed loess reaches 85%, it is considered to be in a saturated collapsible state [3,21,25]. Thus, the storage capacity in the water cistern could be calculated in advance depending on the dosage of the model soil.…”

“…To study the influence of foundation soaking collapsibility on metro tunnel structures, the improved WSS was used to conduct centrifugal model tests under different foundation soaking conditions. All the model soils used were original loess taken from Hongqing station construction site in Xi'an with the following parameters: the degree of self-weight collapsibility of the loess was IV [3], the depth of the samples was varying from 14.7 m to 22.5 m, and the average coefficient of self-weight collapsibility was 0.045. The degree of self-weight collapsibility was used for evaluating the collapsibility of the loess layer, and it could be determined by the self-weight collapsibility value and the collapsibility value.…”

“…Collapsible loess is widely distributed in Xi'an city of China. Many sections of the three existing metro lines and some anticipated metro lines are located in the collapsible loess area [3][4][5][6][7][8][9][10][11]. Hence, it is with great significance to investigate the influence of collapsibility induced by foundation soaking on the mechanical properties of the metro tunnel and determine a reasonable foundation noncollapsible depth that could provide guidance for metro tunnel construction [12][13][14][15][16].…”

Test and Study of Pipe Pile Penetration in Cohesive Soil Using FBG Sensing Technology

“…Due to the small size of the model pipe pile and the small pressure on the pile, the size and sensitivity of the sensor were required to increase, and electrical sensors could not meet the test requirements. Fiber Bragg grating sensors have been applied to the model test due to their strong anti-electromagnetic interference ability, small size, light weight, and remote measurement [25][26][27][28][29][30][31][32][33].…”