公开(公告)号：US20230272696A1

公开(公告)日：2023-08-31

申请号：US18114300

申请日：2023-02-27

Applicant: Shandong University of Science and Technology

Inventor： Bin GONG ,  Yujing JIANG

IPC: E21B41/00 ,  E21B7/04 ,  E21B33/13 ,  E21B49/00 ,  E21B33/12

CPC classification number: E21B41/0099 ,  E21B7/046 ,  E21B33/13 ,  E21B49/00 ,  E21B33/12

Abstract: Disclosed is a method for deep-sea extraction of natural gas hydrates with reservoir top control and sand prevention, belonging to the technical field of natural gas hydrates mining. A grouting layer is constructed between a natural gas hydrates reservoir layer and an upper overburden layer by adopting a multi-branch horizontal well process, a vertical shaft is drilled further into the natural gas hydrates reservoir layer after the grouting layer is stabilized, and a mining device and a bottom plugging device are installed in the vertical shaft according to a thickness of the reservoir.

公开(公告)号：US20180031458A1

公开(公告)日：2018-02-01

申请号：US15658339

申请日：2017-07-24

Applicant: Shandong University of Science and Technology

Inventor： Yujing JIANG ,  Xuezhen WU ,  Gang WANG ,  Shuchen LI ,  Qi WANG ,  Yue CAI

IPC: G01N3/24 ,  G01N19/04 ,  G01B11/25

CPC classification number: G01N3/24 ,  B33Y10/00 ,  B33Y50/00 ,  B33Y80/00 ,  E21D20/02 ,  E21D21/00 ,  G01B11/2518 ,  G01N19/04 ,  G01N2203/0298

Abstract: The present method for testing the bonding strength of rock bolt-grout-surrounding rock comprises the following steps: step 1, fabricating the simulative body of a rock bolt provided with a first surface, wherein the concave-convex characteristic of the first surface is consistent with the surface appearance of a rock bolt, and the first surface is a plane; step 2, pouring a grout layer for simulating the grout material on the first surface of the simulative body of the rock bolt; step 3, pouring a surrounding rock layer for simulating the surrounding rock material on the solidified grout layer, wherein the simulative body of the rock bolt, the grout layer and the surrounding rock layer form a simulative anchoring body; and step 4, performing a shear test along the simulative stress direction of the simulative anchoring body to obtain mechanical parameters reflecting the bonding strength of the anchoring body.

公开(公告)号：US20180031457A1

公开(公告)日：2018-02-01

申请号：US15658334

申请日：2017-07-24

Applicant: Shandong University of Science and Technology

Inventor： Yujing JIANG ,  Xuezhen WU ,  Gang WANG

IPC: G01N3/24 ,  G01N33/24 ,  G01N3/02

CPC classification number: G01N3/24 ,  G01N3/02 ,  G01N33/24 ,  G01N2203/0019

Abstract: The present invention relates to a shear test device and test method of rock mass discontinuities under constant normal stiffness condition. The device includes: a base used for placing a test piece; a loading framework fixedly connected with the base; a shear loading system used for applying a shear force to the test piece; a normal loading system used for applying a normal pressure to the test piece; a normal displacement monitoring system used for measuring the magnitude of normal displacement of the test piece in real time; and a computer control system used for receiving the data of the normal displacement of the test piece in real time, and constantly adjusting the normal pressure applied by the normal loading system to the test piece according to the principle that the normal stiffness of the test piece is unchanged.