Subway-subsidence square anti-seismic and anti-settlement collaborative structure system design method based on soft soil geological conditions

Abstract

The invention provides a subway-subsidence square anti-seismic and anti-settlement collaborative structure system design method based on soft soil geological conditions. The method comprises the steps that geological survey and modeling are carried out; designing a prestressed pipe pile composite foundation and a settlement compensation layer; a seismic isolation support and viscous damper combined anti-seismic node design and a self-adaptive anti-seismic connecting piece design are adopted; designing a settlement and anti-seismic collaborative monitoring system; structural redundancy and self-repairing design; and regular maintenance. Through the combination of the prestressed pipe pile composite foundation, the shock insulation support and the damper, intelligent monitoring control, redundancy self-repairing design and a staged construction technology, the geological adaptability and the anti-seismic property of the subway-sunken square connecting area under the soft soil texture are remarkably enhanced, intelligent cooperative control over settlement and seismic resistance is achieved, long-term stability of the structure is guaranteed, and the service life of the subway-sunken square connecting area is prolonged. Meanwhile, the influence of construction on metro operation is reduced, and construction feasibility is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of building structure design and underground space development, and particularly relates to a subway-sunken plaza anti-seismic and anti-settlement collaborative structure system design method based on soft soil conditions. BACKGROUND

[0002] In the Yangtze River Delta alluvial plain area, the geological condition is mainly soft soil layer, which has the risk of foundation settlement; at the same time, the subway vibration of urban rail transit and potential earthquake activity also put forward higher requirements on the seismic performance of building structure. The existing connection structure of subway station and sunken plaza has the following problems in anti-seismic and anti-settlement: (1) Geological settlement problem: soft soil layer is easy to cause uneven settlement due to long-term load or underground water change, which affects the stability of the connection of subway and plaza structure.

[0003] (2) Insufficient anti-seismic: the traditional structure design is difficult to cope with the double dynamic load of subway vibration and earthquake, which leads to stress concentration or structure cracking at the joint.

[0004] (3) Lack of collaboration: the structure of subway and plaza does not form an overall anti-seismic and anti-settlement system, which cannot realize the dynamic balance and compensation of load.

[0005] Therefore, there is an urgent need for an anti-seismic and anti-settlement collaborative structure system for soft soil conditions to ensure the safety and long-term stability of the connection area of subway station and sunken plaza. SUMMARY

[0006] In view of the deficiencies in the prior art, the present application provides a subway-sunken plaza anti-seismic and anti-settlement collaborative structure system design method based on soft soil conditions, which can greatly improve the seismic performance, significantly reduce the settlement risk and ensure the long-term stability of the structure.

[0007] The present application achieves the above technical purpose through the following technical means.

[0008] A subway-sunken plaza anti-seismic and anti-settlement collaborative structure system design method based on soft soil conditions, comprising the following processes: Step 1: geological survey and modeling; Step 2: foundation structure design according to simulation results, including prestressed pipe pile composite foundation design and settlement compensation layer design; Step 3: anti-seismic node design, including combination of seismic isolation bearing and viscous damper anti-seismic node design and self-adaptive anti-seismic connecting piece design; Step 4: settlement and anti-seismic collaborative monitoring system design; Step 5: structure redundancy and self-repair design; Step 6: regular maintenance to ensure long-term effectiveness of the system.

[0009] Further, in step 2, the prestressed pipe pile composite foundation design includes: using a prestressed concrete pipe pile and a deep mixing pile composite foundation system in the connection area of the subway station and the sunken square, specifically, using a prestressed concrete pipe pile with a length of ≥ 30 meters to penetrate the soft soil layer, and using a deep mixing pile to reinforce the surface soil.

[0010] Further, in step 2, the settlement compensation layer design includes: pouring a settlement compensation layer on the top of the prestressed pipe pile composite foundation and reserving an adjustment space, the settlement compensation layer is composed of high-strength concrete and elastic filling material; and arranging sensors in the settlement compensation layer structure to monitor the settlement in real time, dynamically adjusting the height of the settlement compensation layer by using hydraulic or electric devices to offset the differential settlement of the foundation.

[0011] Further, in step 3, the seismic node design of the combination of the isolation bearing and the viscous damper includes: setting double damping devices at the connection node of the subway station and the sunken square, and monitoring the dynamic load through the pre-embedded sensor, wherein the isolation bearing uses a lead rubber bearing or a high-damping rubber bearing to isolate the subway vibration and the horizontal load of the earthquake, and the viscous damper is installed on both sides of the isolation bearing to absorb the seismic energy and reduce the structural displacement.

[0012] Further, in step 3, the adaptive seismic connector design includes: designing a deformable metal connector made of shape memory alloy or high ductility steel, which can release energy through its own deformation capacity when an earthquake occurs and automatically restore the structural stiffness after the earthquake.

[0013] Further, step 4 includes: At the key parts of the structure, including the foundation, node, and wall, sensors including displacement sensors, strain gauges, and settlement monitors are arranged to collect data in real time and transmit them to the central control system; the central control system uses AI algorithms to dynamically analyze the received settlement, seismic parameters, and structural stress data, and automatically triggers the settlement compensation layer adjustment or the viscous damper mode switching according to the analysis results.

[0014] Further, step 5 includes: Redundant support system design: setting up standby support columns beside the main bearing structure, including telescopic steel columns, which automatically start when the main structure is damaged to ensure the stability of the overall structure; Self-repairing filling material design: filling self-repairing materials, including nano materials or microbial concrete, in the joint gaps, which automatically repair when microcracks occur, prolonging the service life of the structure.

[0015] The present application has the following advantages: The prestressed pipe pile composite foundation can significantly reduce the risk of settlement, the isolation bearing and the damper can work cooperatively to greatly improve the seismic performance, the real-time monitoring and dynamic adjustment can realize the cooperative control of settlement and seismic resistance, the redundant support system and the self-repairing material can ensure the long-term stability of the structure, the construction can reduce the influence on the subway operation and improve the construction feasibility, and the phased construction technology can reduce the influence on the subway operation and be suitable for urban renewal projects. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The method flow chart of the subway-sunken square seismic and settlement cooperative structure system design based on soft soil conditions is shown in the figure. DETAILED DESCRIPTION

[0017] The application will be further described below in combination with the drawings and specific embodiments, but the protection scope of the application is not limited thereto.

[0018] The method flow chart of the subway-sunken square seismic and settlement cooperative structure system design based on soft soil conditions is shown in the figure. Figure 1 The method flow chart of the subway-sunken square seismic and settlement cooperative structure system design based on soft soil conditions is shown in the figure. Step 1: Geological survey and modeling Three-dimensional geological exploration is performed on the project area, the soft soil layer distribution, underground water level and vibration frequency of the subway tunnel are analyzed in detail, a finite element model is established, and the influence of earthquakes and settlement on the structure is simulated.

[0019] Step 2: Foundation structure design according to simulation results Prestressed pipe pile composite foundation design: In the connection area between the subway station and the sunken square, a composite foundation system of prestressed concrete pipe pile (PHC pile) and deep mixing pile (CFG pile) is used. In actual construction, PHC piles with a length of ≥30 meters are used to penetrate the soft soil layer, and CFG piles are used to reinforce the surface soil to form a composite foundation, i.e. a composite foundation system. PHC piles can penetrate the soft soil layer and reach the deep hard soil layer, thereby providing reliable vertical compression support; CFG piles are used to reinforce the soft soil layer to form a composite foundation, effectively reducing uneven settlement and enhancing the bearing capacity of the foundation.

[0020] Settlement compensation layer design: A settlement compensation layer is poured on top of the composite foundation system and a adjusting space is reserved. The settlement compensation layer is composed of high-strength concrete and elastic filling material; by arranging sensors in the settlement compensation layer structure, the settlement amount is monitored in real time, and the height of the settlement compensation layer is dynamically adjusted by hydraulic or electric devices to offset the foundation settlement difference.

[0021] Step 3: Seismic joint design Seismic isolation bearing and viscous damper combined seismic joint: Double damping devices are arranged at the connection joint between the subway station and the sunken plaza, and dynamic load is monitored through pre-embedded sensors; wherein, the seismic isolation bearing adopts a lead rubber bearing or a high-damping rubber bearing, which can effectively isolate subway vibration and seismic horizontal load; viscous dampers are installed on both sides of the seismic isolation bearing to absorb seismic energy and reduce structural displacement.

[0022] Adaptive seismic connection design: Design a deformable metal connection, such as shape memory alloy or high ductility steel, which can release energy through the material's own deformation ability when an earthquake occurs, and automatically restore structural stiffness after the earthquake to enhance the ductility and self-resetting ability of the joint.

[0023] Step 4: Design of settlement and seismic cooperative monitoring system; Intelligent monitoring network: Displacement sensors, strain gauges, settlement monitors and other sensors are arranged at key parts of the structure, such as the foundation, joints, walls, etc., to collect data in real time and transmit it to the central control system.

[0024] Data linkage analysis: The central control system uses AI algorithms to dynamically analyze settlement, seismic parameters, and structural stress data, and automatically triggers settlement compensation layer adjustment or viscous damper working mode switching based on the analysis results.

[0025] Step 5: Redundancy and self-repairing design of structure; Redundant support system: Backup support columns, such as telescopic steel columns, are arranged beside the main load-bearing structure, which automatically activate when the main structure is damaged to ensure the stability of the overall structure.

[0026] Self-repairing filling material: Fill the joint gap with self-repairing materials such as nanomaterials or microbial concrete, which automatically repair when microcracks occur, extending the service life of the structure.

[0027] Step 6: Regular maintenance to ensure long-term effectiveness of the system.

[0028] The embodiments described above are preferred embodiments of the present application, but the present application is not limited to the above embodiments. Any obvious improvements, replacements or modifications made by those skilled in the art without departing from the essential content of the present application shall fall within the scope of protection of the present application.

Claims

1. A design method for a seismic and settlement-resistant collaborative structural system for a subway-sunken plaza based on soft soil geological conditions, characterized in that, The process includes the following: Step 1: Geological survey and modeling; Step 2: Design the basic structure based on the simulation results, including the design of the prestressed pipe pile composite foundation and the settlement compensation layer. Step 3: Seismic joint design, including the design of seismic joints combining seismic isolation bearings and viscous dampers, as well as the design of adaptive seismic connectors; Step 4: Design of a joint settlement and seismic monitoring system; Step 5: Structural redundancy and self-healing design; Step 6: Perform regular maintenance to ensure the long-term effectiveness of the system.

2. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions as described in claim 1, characterized in that, In step 2, the design of the prestressed pipe pile composite foundation includes: adopting a composite foundation system of prestressed concrete pipe piles and deep mixing piles in the connection area between the subway station and the sunken plaza. Specifically, prestressed concrete pipe piles with a length of ≥30 meters are used to penetrate the soft soil layer, and deep mixing piles are used to reinforce the surface soil.

3. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions as described in claim 1, characterized in that, In step 2, the settlement compensation layer design includes: pouring a settlement compensation layer on top of the prestressed pipe pile composite foundation and reserving adjustment space; the settlement compensation layer is composed of high-strength concrete and elastic filling material; and arranging sensors in the settlement compensation layer structure to monitor the settlement in real time, and dynamically adjusting the height of the settlement compensation layer using hydraulic or electric devices to offset the difference in foundation settlement.

4. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions as described in claim 1, characterized in that, In step 3, the seismic design of the combination of seismic isolation bearings and viscous dampers includes: setting up a dual damping device at the connection node between the subway station and the sunken plaza, and monitoring dynamic loads through pre-embedded sensors. The seismic isolation bearings are lead-core rubber bearings or high-damping rubber bearings to isolate subway vibrations and seismic horizontal loads. Viscous dampers are installed on both sides of the seismic isolation bearings to absorb seismic energy and reduce structural displacement.

5. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions according to claim 1, characterized in that, In step 3, the adaptive seismic connection design includes: designing deformable metal connections, including shape memory alloys or high-ductility steel. When an earthquake occurs, the adaptive seismic connection releases energy through the deformation capacity of the material itself and automatically restores the structural stiffness after the earthquake.

6. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions according to claim 1, characterized in that, Step 4 includes: Sensors, including displacement sensors, strain gauges, and settlement monitoring instruments, are deployed at key structural locations, including foundations, nodes, and walls, to collect data in real time and transmit it to the central control system. The central control system uses AI algorithms to dynamically analyze the received settlement, seismic parameters, and structural stress data, and automatically triggers the adjustment of the settlement compensation layer or the switching of the viscous damper working mode based on the analysis results.

7. The design method for a subway-sunken plaza seismic and settlement-resistant collaborative structural system based on soft soil geological conditions as described in claim 1, characterized in that, Step 5 includes: Redundant support system design: Backup support columns, including retractable steel columns, are set up next to the main load-bearing structure. When the main structure is damaged, the backup support columns are automatically activated to ensure the stability of the overall structure. Self-healing filler design: Fill the joint gaps with self-healing materials, including nanomaterials or microbial concrete. When microcracks occur, the self-healing materials automatically repair them, extending the service life of the structure.

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