AU2021101678A4 - Method for testing soft rock ground stress in exploration engineering - Google Patents

Method for testing soft rock ground stress in exploration engineering Download PDF

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Publication number
AU2021101678A4
AU2021101678A4 AU2021101678A AU2021101678A AU2021101678A4 AU 2021101678 A4 AU2021101678 A4 AU 2021101678A4 AU 2021101678 A AU2021101678 A AU 2021101678A AU 2021101678 A AU2021101678 A AU 2021101678A AU 2021101678 A4 AU2021101678 A4 AU 2021101678A4
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Australia
Prior art keywords
stress
sensor
drill hole
rock
hole
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AU2021101678A
Inventor
Lulu Guo
Dan LONG
Mingfei Yang
Shuo ZHANG
Chao ZHENG
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Henan University of Urban Construction
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Henan University of Urban Construction
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/42Road-making materials
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D1/00Investigation of foundation soil in situ
    • E02D1/02Investigation of foundation soil in situ before construction work
    • E02D1/022Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L1/00Measuring force or stress, in general
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/20Design optimisation, verification or simulation
    • G06F30/23Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Abstract

The invention discloses a method for testing soft rock ground stress in exploration engineering, which is characterized in, it comprises the following steps: (1) drill holes in the surrounding rock mass of the soft rock roadway; (2) according to the number of measuring points; (3) put a stress sensor into the drill hole; (4) insert grouting pipe to grouting between the stress sensor and the drill hole wall; (5) repeat steps (3)~(4); (6) calculate the angle and position of each sensor; (7) calculate the internal stress component of each sensor; (8) obtain the secondary stress of the drill hole in an iterative convergence method; (9) retrieve the original rock stress field before the excavated roadway. Compared with the prior art, the invention has the advantages of collecting various force data in the rock and soil by means of multi-point and multi-position measurement, summing up the data, and obtaining the stress distribution inside the rock and soil through calculation and deduction, it is convenient for construction and saves a lot of time and economic investment for the construction of geotechnical materials with uneven stress distribution that are difficult to measure. DRAWINGS drill holes in the surrounding rock mass of the soft rock roadway make the same number of stress sensors put stress sensor into the drill hole, record the depth position of the sensor inside the hole insert grouting pipe to grouting between the stress sensor and the drill hole wall repeat the last two steps until all the sensors are placed in the drill hole calculate the angle and position of each sensor calculate the internal stress component of each sensor obtain the secondary stress of the drill hole in an iterative convergence method I retrieve the original rock stress field before the excavated roadway Figure 1

Description

DRAWINGS
drill holes in the surrounding rock mass of the soft rock roadway
make the same number of stress sensors
put stress sensor into the drill hole, record the depth position of the sensor inside the hole
insert grouting pipe to grouting between the stress sensor and the drill hole wall
repeat the last two steps until all the sensors are placed in the drill hole
calculate the angle and position of each sensor
calculate the internal stress component of each sensor
obtain the secondary stress of the drill hole in an iterative convergence method
I retrieve the original rock stress field before the excavated roadway
Figure 1
DESCRIPTION METHOD FOR TESTING SOFT ROCK GROUND STRESS IN EXPLORATION ENGINEERING
FIELD OF THE invention
The invention relates to the field of rock and soil, in particular to a method for testing soft rock
ground stress in exploration engineering.
BACKGROUND OF THE RELATED ART
Geotechnical engineering is a branch of civil engineering, and it is the science of using
engineering geology, soil mechanics, and rock mechanics to solve engineering technical problems
of rock and soil in various projects. According to the engineering construction stage, the work
content can be divided into: geotechnical engineering survey, geotechnical engineering design,
geotechnical engineering treatment, geotechnical engineering monitoring, and geotechnical
engineeringinspection.
The main research directions of this subject include: Q)Urban underground space and
underground engineering: taking urban underground space as the main body, studying various
environmental geotechnical engineering issues in the development and utilization of underground
space, rational utilization strategies of underground space resources, and various types of
underground structure design, calculation methods and underground engineering construction
techniques (such as shallow burial excavation, shield method, freezing method, precipitation and
drainage method, immersed pipe method, TBM method, etc.) and their optimization measures.
@Slope and foundation pit engineering: focus on the impact of foundation pit excavation (including
foundation pit dewatering) on neighboring existing buildings and the environment, the design
calculation theory and method of foundation pit support structure, and the optimization design of
foundation pit support structure and reliability analysis technology, slope stability analysis theory
and the development and application of new support technology. @Foundation and basis
engineering: focus on research on foundation models and their calculation methods and parameters,
new foundation treatment technologies, new methods and testing technologies, and building
foundations (such as strip foundations under columns, cross foundations, raft foundations, box
research on the mechanism and law of the interaction between the shape foundation and pile
DESCRIPTION
foundation, etc.) and the superstructure.
The biggest problem that the geotechnical discipline needs to face is the stress analysis in the
rock and soil, to test the stress distribution in the rock and soil, a convenient measurement method is
urgently needed.
SUMMARY OF THE invention
The technical problem to be solved by the invention is to provide a rock and soil stress testing
method in view of the above problems.
In order to solve the above technical problems, the technical solution provided by the present
invention is: a method for testing soft rock ground stress in exploration engineering, which is
characterized in, it comprises the following steps:
(1) drill holes in the surrounding rock mass of the soft rock roadway, the drill hole contains
multiple measuring points;
(2) according to the number of measuring points, make the same number of stress sensors;
(3) put a stress sensor into the drill hole, and then push it to the measuring point according to
the designed depth, and the data line will lead out of the hole; record the depth position of the
sensor inside the hole;
(4) insert grouting pipe to grouting between the stress sensor and the drill hole wall, or use an
extrusion mechanism to fill the adhesive between the stress sensor and the drill hole wall, so that
the stress sensor is connected to the drill hole wall, and then record the rotation angle of the sensor
push rod and exit the push rod and grouting rod;
(5) repeat steps (3) (4), install sensors at each of the remaining measuring points, and record
the depth position and rotation angle of each sensor in the hole;
(6) calculate the angle and position of each sensor, and obtain its coordinates and orientation in
the local coordinate system;
(7) after the surrounding rock rheology recovers, based on the readings of the three-way
pressure box, substitute the measured pressure data into the ground stress test principle formula to
calculate the internal stress component of each sensor;
(8) based on the coordinates and orientation of each sensor in the local coordinate system, and
the segmental drilling mechanics model, according to the internal stress component of the sensor,
sensor size, material Young's modulus E and Poisson's ratio, using finite element numerical
DESCRIPTION
simulation to obtain the secondary stress of the drill hole in an iterative convergence method;
(9) according to the secondary stresses formed after the drill hole is calculated from multiple
measuring points, retrieve the original rock stress field before the excavated roadway.
Compared with the prior art, the invention has the advantages of collecting various force data
in the rock and soil by means of multi-point and multi-position measurement, summing up the data,
and obtaining the stress distribution inside the rock and soil through calculation and deduction. It is
convenient for construction and saves a lot of time and economic investment for the construction of
geotechnical materials with uneven stress distribution that are difficult to measure.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is a flow chart of a method for testing soft rock ground stress in exploration
engineering.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The following is a further detailed description of the invention.
When the invention is actually implemented, it is a method for testing soft rock ground stress
in exploration engineering, which is characterized in, it comprises the following steps:
(1) drill holes in the surrounding rock mass of the soft rock roadway, the drill hole contains
multiple measuring points;
(2) according to the number of measuring points, make the same number of stress sensors;
(3) put a stress sensor into the drill hole, and then push it to the measuring point according to
the designed depth, and the data line will lead out of the hole; record the depth position of the
sensor inside the hole;
(4) insert grouting pipe to grouting between the stress sensor and the drill hole wall, or use an
extrusion mechanism to fill the adhesive between the stress sensor and the drill hole wall, so
that the stress sensor is connected to the drill hole wall, and then record the rotation angle of the
sensor push rod and exit the push rod and grouting rod;
(5) repeat steps (3)~(4), install sensors at each of the remaining measuring points, and record
the depth position and rotation angle of each sensor in the hole;
(6) calculate the angle and position of each sensor, and obtain its coordinates and orientation in
the local coordinate system;
DESCRIPTION
(7) after the surrounding rock rheology recovers, based on the readings of the three-way
pressure box, substitute the measured pressure data into the ground stress test principle formula
to calculate the internal stress component of each sensor;
(8) based on the coordinates and orientation of each sensor in the local coordinate system, and
the segmental drilling mechanics model, according to the internal stress component of the
sensor, sensor size, material Young's modulus E and Poisson's ratio, using finite element
numerical simulation to obtain the secondary stress of the drill hole in an iterative convergence
method;
(9) according to the secondary stresses formed after the drill hole is calculated from multiple
measuring points, retrieve the original rock stress field before the excavated roadway.
The working principle of the invention: the measurement is carried out by sensors with
direction, angle and force measurement, the sensors will return the collected data, and the stress
analysis can be carried out with the help of manual or computer tools, which can avoid the
ineffective economic cost and time cost.
Although the embodiment of the present invention has been shown and described above, it can
be understood that the above-mentioned embodiment is exemplary and should not be construed as
limiting the present invention, those of ordinary skill in the art will not depart from the present
invention, under the principle and purpose, the above-mentioned embodiment can be changed,
modified, replaced and transformed within the scope of the present invention.

Claims (1)

1. A method for testing soft rock ground stress in exploration engineering, which is characterized in,
it comprises the following steps:
(1) drill holes in the surrounding rock mass of the soft rock roadway, the drill hole contains
multiple measuring points;
(2) according to the number of measuring points, make the same number of stress sensors;
(3) put a stress sensor into the drill hole, and then push it to the measuring point according to the
designed depth, and the data line will lead out of the hole; record the depth position of the sensor
inside the hole;
(4) insert grouting pipe to grouting between the stress sensor and the drill hole wall, or use an
extrusion mechanism to fill the adhesive between the stress sensor and the drill hole wall, so that
the stress sensor is connected to the drill hole wall, and then record the rotation angle of the sensor
push rod and exit the push rod and grouting rod;
(5) repeat steps (3)-(4), install sensors at each of the remaining measuring points, and record the
depth position and rotation angle of each sensor in the hole;
(6) calculate the angle and position of each sensor, and obtain its coordinates and orientation in
the local coordinate system;
(7) after the surrounding rock rheology recovers, based on the readings of the three-way pressure
box, substitute the measured pressure data into the ground stress test principle formula to calculate
the internal stress component of each sensor;
(8) based on the coordinates and orientation of each sensor in the local coordinate system, and the
segmental drilling mechanics model, according to the internal stress component of the sensor,
sensor size, material Young's modulus E and Poisson's ratio, using finite element numerical
simulation to obtain the secondary stress of the drill hole in an iterative convergence method;
(9) according to the secondary stresses formed after the drill hole is calculated from multiple
measuring points, retrieve the original rock stress field before the excavated roadway.
D R AW I N G S 31 Mar 2021 2021101678
Figure 1
AU2021101678A 2021-03-31 2021-03-31 Method for testing soft rock ground stress in exploration engineering Active AU2021101678A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2021101678A AU2021101678A4 (en) 2021-03-31 2021-03-31 Method for testing soft rock ground stress in exploration engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2021101678A AU2021101678A4 (en) 2021-03-31 2021-03-31 Method for testing soft rock ground stress in exploration engineering

Publications (1)

Publication Number Publication Date
AU2021101678A4 true AU2021101678A4 (en) 2021-05-27

Family

ID=76094250

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2021101678A Active AU2021101678A4 (en) 2021-03-31 2021-03-31 Method for testing soft rock ground stress in exploration engineering

Country Status (1)

Country Link
AU (1) AU2021101678A4 (en)

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