The split-lining structure was newly developed for the air-tight lining of the underground compressed air storage cavern. This structure consists of separated reinforced concrete (RC) segments and air-tight membrane._ It is most important for the Compressed Air Energy Storage Gas Turbine (CAES-G/T) system to develop the economical lining. In order to verify the applicability of split-lining structure, CAES-G/T pilot plant was constructed and operated for 6 months. We confirmed the practical usefulness and safety of this system through the operation. This paper presents the mechanical behaviour of surrounding rock mass and the lining structure observed through the operation of CAES-G/T pilot plant.

Nous avons mis au point une structure de revêtement modulaire pour le revêtement des cavernes souterraines hermetiques à pression. Ce revêtement est compose de segments de beton arme et de membranes hermetiques. Il etait très important, pour le CAES-G/T (Compressed Air Energy Storage Gas Turbine), de developper un revêtement economique. Afin de verifier l'aptitude d'application de notre revêtement modulaire, nous avons construit un système pilote CAES-G/T et nous avons effectue des essais de fonctionnement pendant six mois. Ces essais nous ont permis de confirmer l'utilite et la securite du système. A travers le present rapport, nous rendons compte de la structure de ce nouveau type de revêtement et du comportement mecanique de la masse rocheuse environnante que nous avons pu observer au cours desdits essais.

Als luftdichter Druckbehalter wurde eine gegliederte Belagsstruktur fuer tief unterirdisch liegende Felshöhlungen entwickelt. Diese Struktur ist aus Stahlbetonabdeckung und luftdichter Plane aufgebaut. Bei der Entwicklung des Pressluftgasturbinen - Stromerzeugungssystems (CAES-G/T) war es die wichtigste Aufgabe, einen wirtschaftlichen Belag zu entwickeln. Deswegen wurde zum Nachweis der Effektivitat der gegliederten Belagsstruktur eine Pilotanlage errichtet und 6 Monate lang betrieben. Durch den Betrieb konnten wir die Praktikabilitat und Sicherheit des Systems bestatigen. Dieser Aufsatz ist ein Bericht ueber das Verhalten der durch Betrieb der CAES-G/T Pilotanlage beobachteten Belagsstruktur und umliegenden Felsmasse.

Introduction

In recent years, the use of underground has been advanced in various fields. A proof test was developed in Japan to use the underground cavern as a compressed air storage facility. To prove the practical use and the safety of the CAES-G/T power generation system1), this test was executed in the underground compressed air storage cavern, which was constructed in the depth of 450m from the ground surface.

In order to store the high-pressured air, both pressure resistance and air-tightness are required. However, it might cost a great deal to make mass storing facilities with a metallic material such as steel lining. Then, to construct the storage facilities economically, we developed a new airtight lining structure. This structure ensures the pressure resistance to bear whole internal pressures to the surrounding rock mass and the air-tightness to have expansion and contraction in consideration of the rock properties of our country where a lot of cracks existed.

Newly Developed Structure

The main technological problem of the underground compressed air storage cavern.

Keywords:
reservoir geomechanics, displacement, operation, underground, Reservoir Characterization, extensometer, rubber sheet, examination, Wellbore Design, cavern
Subjects:
Wellbore Design, Reservoir Characterization, Rock properties, Reservoir geomechanics
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2003. The South African Institute of Mining and Metallurgy. Permission to Distribute - International Society for Rock Mechanics.
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