公开(公告)号：US20240044740A1

公开(公告)日：2024-02-08

申请号：US18547754

申请日：2022-11-25

Applicant: Northeastern University

Inventor： Benguo HE ,  Xiating FENG ,  Jie WANG ,  Shichen QIU ,  Xiangrui MENG ,  Lei WANG

IPC: G01M7/08 ,  G01N3/313 ,  G01N33/24

CPC classification number: G01M7/08 ,  G01N3/313 ,  G01N33/24

Abstract: The invention provides a method and system for a blast-induced vibration monitoring of a tunnel in high asymmetric in-situ stresses. According to the method, triaxial vibration sensors are respectively fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor monitors blast vibration velocity and acceleration at a position thereof. The system comprises a plurality of triaxial vibration sensors which are fixed in areas having different radial depths inside surrounding rocks of a stress concentration area behind a tunnel face of the tunnel in high asymmetric in-situ stresses, and each triaxial vibration sensor is used for monitoring blast vibration velocity and acceleration at a position thereof. The method and system can improve the safety and the efficiency of tunnel excavation construction.

公开(公告)号：US20230273103A1

公开(公告)日：2023-08-31

申请号：US18024200

申请日：2022-01-05

Applicant: Northeastern University

Inventor： Benguo HE ,  Xiating FENG ,  Rongli ZHEN ,  Xiwei ZHANG ,  Chengxiang YANG ,  Mian TIAN ,  Hongpu LI ,  Hongyuan FU

IPC: G01N3/04

CPC classification number: G01N3/04 ,  G01N2203/0256 ,  G01N2203/0447 ,  G01N2203/0067

Abstract: Provided is a clamp of elastic box of stiff true-triaxial testing system and a displacement monitoring method for cuboid specimens. The clamp includes six pressing plates and eight plate springs, which form an elastic pressure box. One surface of the elastic pressure box can be disassembled, which simplifies the steps of rock sample mounting, and saving the mounting time. The springs connected with the pressing plates ensures the stability of the clamp but cannot affect the stress state of other surfaces of the rock sample during the test of the rock sample, thereby ensuring test accuracy. The invention further provides a displacement monitoring method for the rock sample by using the elastic box clamp. Six displacement sensors are mounted on the elastic box clamp, and the displacement of the rock sample can be monitored in real time.

公开(公告)号：US20240248018A1

公开(公告)日：2024-07-25

申请号：US18546401

申请日：2023-02-23

Applicant: Northeastern University

Inventor： Benguo HE ,  Xiating FENG ,  Jie WANG ,  Rongli ZHEN ,  Hongpu LI ,  Mian TIAN ,  Zhibin YAO

IPC: G01N3/08

CPC classification number: G01N3/08 ,  G01N2203/0208 ,  G01N2203/0256

Abstract: A dual-direction synchronous loading method for a true-triaxial test apparatus includes the following steps: Step S1, loading a sample and adjusting the sample at a center of a sample box and a rigid loading frame; Step S2, setting parameters and sending action instructions through a computer control panel; and Step S3, collecting load signals collected by each sensor acquired by a PID controller, and coordinating a size of triaxial dual-direction loading loads to realize a single instruction dual-direction synchronous loading. The method ensures that a rock sample is kept at a center of a pressure chamber before being loaded, so that a focus of a loading axis is always at a same position as a center of the sample in space, and the function of synchronous loading of two loading actuators in the same direction under a single instruction can be achieved.