Variable dip fault slip simulation test method

Patent metadata

Field	Value
Publication number	US-11441982-B2
Application number	US-202217575150-A
Country	US
Kind code	B2
Filing date	Jan 13, 2022
Priority date	Dec 9, 2020
Publication date	Sep 13, 2022
Grant date	Sep 13, 2022

Abstract

The disclosure provides a variable dip fault slip simulation test method, which relates to the technical field of indoor simulation test of underground engineering. The variable dip fault slip simulation test method of the disclosure adopts a sample device and a loading device, which includes the following steps: Step 1. sample preparation; Step 2. sample assembly; Step 3. loading preparation; Step 4. sample loading. The variable dip fault slip simulation test method of the disclosure can prepare rock like samples with different dip interfaces, simulate the slip failure process of faults with different dip angles, as well as the normal dip slip and reverse dip slip of faults, facilitate the operation of slip simulation test, and collect test data automatically and accurately.

First claim

What is claimed is:

1. A variable dip fault slip simulation test method, which adopts a sample device and a loading device;
the sample device comprises a bottom plate, a sliding partition plate, a combined pressing plate and a rotating baffle; front and rear edges of the bottom plate are provided with sliding grooves, left and right sides of the bottom plate are provided with the sliding partition plates, front and rear ends of the the sliding partition plates are provided with sliding blocks, and the sliding blocks are slidably connected in the sliding grooves; the front and rear sides of the bottom plate are provided with the combined pressing plates, wherein the combined pressing plates are formed by splicing a plurality of the pressing blocks from head to tail, and two ends of the combined pressing plate are spliced with ends of the sliding partition plate; a rotating baffle is arranged at a middle position of the bottom plate, wherein the rotating baffle comprises a fixed plate and a sliding plate, the fixed plate is rotatably connected with the middle position of the bottom plate and the fixed plate is detachably connected with the bottom plate, and both sides of the fixed plate are slidably connected with a sliding plate; an end of the sliding plate is provided with a positioning member, wherein the positioning member is detachably connected with the combined pressing plate;
the loading device comprises a loading support platform, a top loading indenter, a top pressure bearing unit, a bottom loading indenter, a side loading indenter, a side pressure bearing unit, a bearing seat, a strain gauge, an acoustic emission detector, a computer and a camera; the loading support platform comprises a base, a left loading support frame, a right loading support frame and an upper loading support frame; the left and right sides of the base are respectively provided with the left loading support frame and the right loading support frame, and the upper loading support frame is provided on the left loading support frame and the right loading support frame; a top loading indenter is arranged on the upper loading support frame; the top bearing unit comprises a force transfer column, a roller and an upper pressure bearing plate, an upper end of the force transfer column is connected with the top loading indenter, a lower end of the force transfer column is rotated side by side and is connected with a plurality of rollers, and one side of the upper pressure bearing plate is provided with a baffle bent downward; the bottom loading indenter is set on the base; the bearing seat is arranged on the left loading support frame, and a right end of the bearing seat is rotated side by side from top to bottom to connect a plurality of rollers; a side loading indenter is arranged on the right loading support frame; the side pressure bearing unit comprises a guide shaft, a linear bearing, a side pressure bearing plate and the rollers, the guide shaft is arranged on a right side of the base, the linear bearing is arranged on the guide shaft, the side pressure bearing plate is arranged on the linear bearing, and a left end of the side pressure bearing plate is rotated side by side from top to bottom to connect a plurality of rollers;
the method comprises the following steps:
step 1. sample preparation
rotating the fixed plate to a preset angle to simulate the fault inclination with the preset angle, so as to make the sliding plate stretch out and draw back relative to the fixed plate; connecting the sliding plate with the combined pressing plate for positioning through the positioning member; wherein the bottom plate, the sliding partition plate and the combined pressing plate form a semi-enclosed cavity, and the rotating baffle separates the semi-enclosed cavity into two cavities; applying lubricating oil on an upper surface of the bottom plate, an inner wall of the sliding partition plate, an inner wall of the combined pressing plate, and a surface of the rotating baffle, injecting a first type of rock material into the two cavities, removing the rotating baffle and the bottom plate after the first type of rock material solidifies into a rock-like sample, removing the lubricating oil on the surface of the rock-like sample, and maintaining the rock-like sample;
wherein, the first type of rock material injected into the two cavities is the same material or different materials;
step 2. sample assembly
defining the rock-like sample in the cavity behind the rotating baffle as a footwall sample, and defining the rock-like sample in the cavity in front of the rotating baffle as the hanging wall sample, and the footwall sample and the hanging wall sample together form the rock-like sample; an overlapping interface between the footwall sample and the hanging wall sample is a fault interface, placing the combined pressing plates on upper and lower sides of the rock-like samples, placing the sliding partition plates on left and right sides of rock-like samples, splicing the combined pressing plate with the the sliding partition plate, wherein the combined pressing plate is disconnected at the fault interface;
step 3. loading preparation
in the rock-like samples, placing the footwall sample at the lower left and the hanging wall sample at the upper right, wherein the combined pressing plate on the lower side of the footwall sample is attached to the bottom loading indenter, the sliding partition plate on the left side of the footwall sample is attached to a plurality of the rollers on the bearing seat; placing the top pressure bearing unit on the upper side of the hanging wall sample, wherein the combined pressing plate on the upper side of the hanging wall sample is attached to the upper pressure bearing plate, the top position of the sliding partition plate on the right side of the hanging wall sample is attached to the baffle, and the other positions except the top position of the sliding partition plate on the right side of the hanging wall sample are attached to the plurality of rollers on the side pressure bearing plate;
or, in the rock-like samples, placing the footwall sample at the lower right and the hanging wall sample at the upper left; wherein the combined pressing plate on the lower side of the hanging wall sample is attached to the bottom loading indenter, and the sliding partition plate on the left side of the hanging wall sample is attached to the plurality of the rollers on the bearing seat; placing the top pressure bearing unit on the upper side of the footwall sample, wherein the combined pressing plate on the upper side of the footwall sample is attached to the upper pressure bearing plate, the top position of the sliding partition plate on the right side of the footwall sample is attached to the baffle, and the other positions except the top position of the sliding partition plate on the right side of the footwall sample are attached to the plurality of the rollers on the side pressure bearing plate;
arranging the strain gauges along the fault interface on the surface of rock-like samples, arranging acoustic emission detectors on the left and right sides of the surface of rock-like samples, applying speckle on the surface of rock-like samples, aligning the camera with the surface of rock-like samples, connecting the top loading indenter, the bottom loading indenter, the side loading indenter, the strain gauges, the acoustic emission detectors and the camera with computer via signals, respectively;
step 4. sample loading
when the footwall sample is placed at the lower left and the hanging wall sample is placed at the upper right,
the computer first drives the side loading indenter to apply a lateral stress of the preset pressure to the rock-like sample, and then the computer drives the top loading indenter to apply an axial stress of the preset pressure to the rock-like sample; during the normal dip slip of the hanging wall

Assignees

• Univ Shandong Science & Tech

Inventors

• Guo Weiyao
• Tan Yan
• Zhao Tongbin
• Tan Yunliang
• Zhang Dongxiao

Classifications

• G01N2203/0658

  using acoustic or ultrasonic detectors · CPC title

• G01N2203/0435

  modifying the type of the force applied, e.g. the chuck transforms a compressive machine for applying a bending test · CPC title

• G01N2203/0252

  Monoaxial, i.e. the forces being applied along a single axis of the specimen · CPC title

• G01N3/06

  Special adaptations of indicating or recording means · CPC title

• G01N2203/0003

  Steady · CPC title