Underground structure active and passive combined anti-floating system and control method

Abstract

This invention relates to the field of underground structure engineering technology, specifically to an active-passive combined anti-buoyancy system and control method for underground structures. The system includes a pressure sensor array, an adjustable one-way pressure relief valve, and a cloud platform controller. The pressure sensor array is used to periodically collect water pressure data at different locations on the foundation of the underground structure and feed it back to the cloud platform controller. The adjustable one-way pressure relief valve is used to perform drainage operations. The cloud platform controller receives the water pressure data from the pressure sensor array, combines the passive anti-buoyancy bearing capacity of the structure with the buoyancy force experienced by the structure at various locations in the current state, performs a combined anti-buoyancy calculation, obtains the resistance effect ratio within the underground structure range, and controls the opening degree of the adjustable one-way pressure relief valve. This invention can regulate the water pressure level of underground engineering in real time, and by analyzing the structural bearing capacity margin in real time, it can ensure the structural anti-buoyancy safety while reducing drainage volume.

Claims

1. A combined active and passive anti-buoyancy system for underground structures, characterized in that, Includes a pressure sensor array, an adjustable one-way pressure relief valve, and a cloud platform controller; The cloud platform controller is connected to the pressure sensor array and the adjustable one-way pressure relief valve, respectively. The pressure sensor array is used to periodically collect water pressure data at different locations in the underground structure foundation and feed it back to the cloud platform controller. The adjustable one-way pressure relief valve is arranged in the pressure limiting well and is used to perform drainage operations; The cloud platform controller is used to receive water pressure data from the seepage pressure sensor array, combine the passive anti-buoyancy bearing capacity of the structure with the buoyancy force experienced by the structure at various locations in the current state, perform joint anti-buoyancy verification, obtain the resistance effect ratio within the underground structure range, and control the opening degree of the adjustable one-way pressure relief valve.

2. The combined active and passive anti-buoyancy system for underground structures as described in claim 1, characterized in that, The cloud platform controller is configured as follows: Using water pressure data from a pressure sensor array, and based on the distance between the calculation point and each sensor in the pressure sensor array, the buoyancy force Sw at each location of the structure under the current state is calculated by linear interpolation. At each calculation point, the passive anti-buoyancy bearing capacity of the structure is taken as Rb=min{Rs,Rw}, where Rs is the location of the calculation point, which is the sum of the self-weight of all the superstructure and the vertical pull-out force provided by the pull-out piles and anti-buoyancy anchors within the adjacent column span, and Rw is the maximum water buoyancy force that the bottom plate of the structure can bear at the calculation point location. When the ratio of Kw to the preset safety factor K is lower than the preset margin F, small-flow drainage is started according to the preset rules.

3. The combined active and passive anti-buoyancy system for underground structures as described in claim 2, characterized in that, When starting the low-flow drainage, the method for determining the opening degree of the adjustable one-way pressure relief valve includes: Within each of the four quadrants surrounding the calculation point, select one pressure-limiting well equipped with an adjustable one-way pressure relief valve that is closest to the calculation point, and obtain four paths to the calculation point with lengths L1 to L4 respectively. The overall opening ratio is calculated as (Fw-1) / (F-1), where Fw=Kw / K; Based on the distance of the path, the opening ratio of the pressure relief valves in the four pressure-limiting wells is determined, i.e., Mi=Li / (L1+L2+L3+L4)×(Fw-1) / (F-1). After the adjustable one-way pressure relief valve is opened, the opening amount is dynamically adjusted in real time according to this calculation logic until Fw≥F.

4. The combined active and passive anti-buoyancy system for underground structures as described in claim 1, characterized in that, The pressure sensor array is either a fiber optic pressure sensor array or a vibrating wire pressure sensor array.

5. A control method for a combined active and passive anti-buoyancy system for underground structures, applied to the combined active and passive anti-buoyancy system for underground structures as described in any one of claims 1-4, characterized in that, include: Water pressure data at different locations in the foundation of the underground structure are collected periodically by an array of seepage pressure sensors and fed back to the cloud platform controller. Drainage is performed using an adjustable one-way pressure relief valve; The cloud platform controller receives water pressure data from the seepage pressure sensor array, combines the passive anti-buoyancy bearing capacity of the structure with the buoyancy force experienced by the structure at various locations under the current state, performs joint anti-buoyancy verification, obtains the resistance effect ratio within the underground structure range, and controls the opening degree of the adjustable one-way pressure relief valve.

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