Course Title : Measurement in the earth's crust environment

Code 10F085
Course Year Master and Doctor Course
Term 1st term
Class day & Period Wed 3rd
Location C1-192
Credits 2
Restriction No Restriction
Lecture Form(s) Lecture
Language English
Instructor Tsuyoshi ISHIDA, Toshihiro ASAKURA, Koji YAMAMOTO

Course Description

Necessity of information on the environment in the upper layer of the earth's crust will be explained, as well as measuring methods for it and applications of the measuring results for various engineering projects. Among them, rock stress measurements and their applications will be focused in the relation to the projects of oil field development, underground disposal of high level radio active waste, geological sequestration of CO2, construction of underground power houses and hot dry rock geothermal power extraction. The importance of initial stress conditions on planning and maintenance of tunnels and others also will be discussed.

Grading

Grading will be made from scores of the followings: ・Report for classes by Ishida. ・Achievement test for classes by Yamamoto. ・Report for classes by Asakura. ・Number of attendance for the classes.

Course Goals

Goals of this course are the followings. 1) To understand the important effect of initial rock stress on stability of underground chambers and deep underground tunnels. 2) To understand stress relief methods as one of typical methods to measure initial rock stress condition. 3) To understand the principle of a least square method though learning a procedure to determine an initial rock stress condition from released strains measured on a borehole wall. 4) To understand importance and purpose of rock stress measurement for oil field development through borehole breakout problems and others. 5) To understand hydraulic fracturing stress measurement conducted in drill holes for oil field development. 6)To understand history of tunneling technology in Japan. 7) To understand relations between maintenance of tunnels and underground environment. 8) To understand countermeasures against damages of tunnels induced by earthquakes.

Course Topics

Theme Class number of times Description
Importance of rock stress condition in underground development (by ISHIDA) 3 Necessity of rock stress measurements and their applications for various engineering projects. Among the projects, underground disposal of high level radio active waste, geological sequestration of CO2, construction of underground power houses and hot dry rock geothermal power extraction will be focused.
Stress relief methods to measure rock stress and applicaiton of least square method (by ISHIDA) 3 Actual field works of stress relief methods to measure initial rock stress condition will be explained. Though learning a procedure to determine an initial rock stress condition from released strains measured on a borehole wall, the principle of a least square method will be explained. The report subject will be shown in the last week.
Rock stress measurement for oil field development (by YAMAMOTO) 4 Estimation of rock stress condition by hydraulic fracturing and logging, which is conducted at various steps for oil field development, will be explained. Importance of rock stress affecting on borehole stability will be explained as well.
Tunneling technology in relation to underground environment (by ASAKURA) 4 Tunneling technology in Japan is historically reviewed. Relations between maintenance of tunnels and underground environment and countermeasures against damages of tunnels induced by earthquakes will be explained.
Check of understanding 1 Your understanding is checked by a written test.

Textbook

None. Printed materials will be given in classes when needed.

Textbook(supplemental)

1) Amadei, B. & Stephansson, O.: Rock Stress and Its Measurements, Capman & Hall, 1977.
2) Vutukuri, V. S. & Katsuyama, K.: Introduction to Rock Mechanics, Industrial Publishing & Consulting, Inc., Tokyo, 1994.

Prerequisite(s)

Elasticity, Linear Algebra (Calculation of Matrices) and Computer Literacy (for example, Excel, Word and so on.)

Web Sites

Additional Information

This class is made by English.