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,Yoshitaka NARA,Koji YAMAMOTO, Kiyoshi AMEMIYA

Course Description

Information necessary to understand environment in the upper layer of the earth's crust will be explained for various engineering projects. Among them, measurements of rock stress and mechanical properties of rock will be focused in the relation to the projects of oil and gas exploitaiton, underground disposal of radio active waste, geological sequestration of CO2, construction of underground power houses and hot dry rock geothermal power extraction.

Grading

Grading will be made from scores of the followings; report for subjects, achievement tests and number of attendance to the classes.

Course Goals

Goals of this course are the followings. 1) To understand effects of initial rock stress on stability of underground chambers for verious purposes. 2) To understand a stress relief method as one of typical rock stress measurement. 3) To understand the principle of a least square method though learning a procedure to determine initial rock stress condition from released strains measured on a borehole wall. 4) To understand effects of rock stress for oil and gas exploitation through borehole breakout problems and others. 5)To understand purposes and latest technologies for long term monitoring up to 100,000 years. 6) To understand mechanical properties of rock (strength, permeability, fracturing, etc.) under different environmental condition with methodology of their measurements.

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 will be explained. Among the projects, underground disposal of 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.
Effect of rock stress on oil and gas exploitation 4 Estimation of rock stress condition by hydraulic fracturing and logging, which is conducted at various steps for oil and gas exploitation, will be explained. Importance of rock stress affecting on borehole stability will be explained as well.
Monitoring in Deep Underground Facility - to ensure the long term stability- 2 The purposes and latest technologies of monitoring are shown in this lecture, focusing on the methods of ensuring the long term (up to 100,000 years) safety assessment of radioactive waste disposal.
Measurement of mechanical properties of rock under various environment 2 Mechanical properties of rock (strength, permeability, fracturing, etc.) under different environmental condition are shown, as well as the methodology of measurements. In addition, the relationship between the rock properties and radioactive waste disposal is described.
Confirmation of understanding 1 Feedback through tests and others.

Textbook

None. Handouts 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.)

Independent Study Outside of Class

When you make a report, it is necessary to calculate matrixes by using a Microsoft Excel and others.

Web Sites

Additional Information

This class is made by English.