Design method of water curtain system for underground water-sealed cavern

Abstract

The invention relates to the technical field of an underground water seal cave depot, in particular to a design method for a water curtain system of an underground water seal cave depot. The method comprises the steps: designing a water curtain roadway after the completion of the design of a main chamber and the design of a traffic roadway; designing a horizontal water direction curtain hole and a vertical direction water curtain hole; carrying out construction reconnaissance on the development condition of a fault fracture zone; after the excavation forming of the water curtain roadway, designing a preprocessing scheme to weak rock mass in the main chamber; carrying out a backup flooding test to all water curtain holes of the roadway after the completion of all water curtain holes of some water curtain roadway; and designing a blocking scheme to seepage channels discovered. According to the design method provided by the invention, the depth of the horizontal direction water curtain hole can be greatly reduced, and the pore-forming construction difficulty is low; furthermore, the preliminary grouting is injected to the weak rock mass in the main chamber through the water curtain roadway, so as to be beneficial for ensuring the construction progress and reducing the construction risk; furthermore, the grouting can be injected to the seepage channels for blocking, and the loss of underground water can be prevented or reduced when the main chamber is excavated, so as to ensure the water seal environment all around the main chamber.

Description

technical field

[0001] The invention relates to the technical field of underground water-sealed caverns, in particular to a design method for a water curtain system of an underground water-sealed cavern. Background technique

[0002] The underground water-sealed oil storage cavern is to dig a cave below the stable groundwater level, and the cave wall is not lined. The groundwater around the cavern is used to seal the cracks in the rock mass to achieve the purpose of sealing oil. Using groundwater pressure to maintain airtightness is the key to the long-term storage of oil in underground water-sealed caverns, which requires maintaining a sufficiently thick fractured aquifer in the rock mass around the main oil storage chamber, the so-called water-sealed layer. In order to maintain the stability of the water seal layer, it is usually necessary to build a water curtain system to inject water into the rock mass through the water curtain holes to replenish the groundwater and ens...

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