Method for setting safety early warning threshold value of double-layer lining water delivery tunnel operation structure on soft foundation

Abstract

The invention relates to a method for setting a safety early warning threshold value of a double-layer lining water delivery tunnel operation structure on a soft foundation. The method comprises the following steps that 1, interlayer osmometers are arranged between an inner lining and an outer lining of a tunnel, and statistical regression analysis is carried out on monitoring results of the interlayer osmometers; 2, the change rate of the water level of the tunnel and the change rate of the aging component of the interlayer osmometer are calculated; 3, outer layer osmometers are arranged in an outer soil layer of the outer lining to monitor the elevation of the external underground water level of the outer lining in real time; and 4, according to the statistical regression analysis resultin the step 1, the calculation result in the step 2 and the elevation of the external underground water level of the outer lining in the step 3, the three-level safety early warning threshold value of the double-layer lining water delivery tunnel operation structure on the soft foundation is determined. According to the method, the blank that a method for setting the risk early warning thresholdvalue of the double-layer lining structure on the soft foundation is lacked in the prior art is filled, the safety monitoring requirement of actual engineering operation can be met, and the safe operation of the double-layer lining water delivery tunnel on the soft foundation is guaranteed.

Description

Technical field [0001] The invention relates to a method for setting a safety early warning threshold of a double-lined water conveyance tunnel operating structure on a soft foundation, and belongs to the technical field of water conservancy engineering. Background technique [0002] Such as figure 1 As shown, large-diameter water delivery tunnels on soft foundations often adopt a double-layer lining structure type. The double-layer lining structure type is to add an elastic cushion layer 3 between the outer lining 1 and the inner lining 2, so that the two linings are completely separated and stressed , The outer lining 1 bears the external water and soil load, the inner lining 2 bears the internal water pressure, the inside and the outside are separated, and the force is clear. [0003] The outer lining of this type of double-layer lining structure is a block-assembled structure of shield construction. There are many pipe joints. Although a drainable elastic cushion is arranged be...

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Problems solved by technology

[0004] At present, there is no method for setting risk warning thresholds for double-layer lining structures on soft foundations, which cannot meet the safety monitoring requirements of actual engineering operations.

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