A seismic mitigation system and method

Abstract

The application discloses a kind of shock absorption system and method, the shock absorption system includes pumping injection device and the pebble stratum of certain volume, pumping injection device is used to inject or pump liquid in pebble stratum, and pebble stratum is used as the foundation of building structure.The shock absorption system can change the mass of pebble stratum by pumping liquid to closed pebble stratum, realize the adjustment of pebble stratum inertia force size and the adjustment of self-vibration frequency, play the resonance effect and liquid sloshing friction energy dissipation through the movement of pebble stratum, reduce the vibration response of building structure, greatly improve the shock absorption energy dissipation efficiency of system, effectively reduce earthquake disaster, also can avoid sand liquefaction phenomenon under the earthquake action of natural pebble stratum;It can directly utilize the characteristics of natural pebble stratum, realize the device of tuning liquid damper shock absorption effect, and be applicable to different foundation conditions, construction is convenient, with good energy dissipation effect, the shock absorption system has pioneering engineering significance and practical value.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of construction engineering, in particular to a seismic mitigation and isolation system and method. BACKGROUND

[0002] With the expansion of urban construction, the demand for complex geological engineering environment is increasingly urgent. The upper building structure constructed on the site with complex foundation conditions faces the problem of insufficient seismic performance. Therefore, it is increasingly important to improve the seismic performance of the upper building structure under seismic excitation. Therefore, it has become an economic and effective means to improve the overall stiffness and damping of the foundation so that the energy dissipation and seismic mitigation effect is achieved. The foundation seismic mitigation and isolation technology for improving the engineering properties of natural strata to realize the seismic performance and energy dissipation of the upper building structure has broad prospects in engineering.

[0003] For foundation seismic mitigation and isolation technology, it can be divided into seismic mitigation control and seismic isolation control from the control theory. Seismic mitigation control minimizes the vibration response of the upper building structure by attaching energy dissipation and seismic mitigation devices or tuned seismic mitigation damper devices. Seismic isolation control prevents the structure from being affected by vibration by adding seismic isolation bearings between the foundation and the upper building structure.

[0004] Conventional foundation seismic mitigation and isolation technology only requires the foundation in terms of bearing capacity. Therefore, the common foundation treatment method is achieved by strengthening the foundation strategy. The seismic mitigation measures are achieved by improving the upper building structure. For example, for the problem of seismic control of high-rise structures, the commonly used method is to set tuned mass dampers, tuned liquid dampers on the roof, or set viscous dampers between the foundation and the upper building structure. The damper of this metal structure mainly changes the dynamic characteristics of the structure and reduces the dynamic response of the structure by adding mass, damping, and spring, which are three basic mechanical elements in the structure. The metal damper has the problems of high material cost, concentrated yield point of the metal damper, and limited seismic mitigation capacity. SUMMARY

[0005] The present application aims to solve the problems of conventional foundation seismic mitigation and isolation technology, which only requires the foundation in terms of bearing capacity, and the common foundation treatment method is achieved by strengthening the foundation strategy. The seismic mitigation measures are achieved by improving the upper building structure. However, the metal damper used in the seismic mitigation measures has the problems of high material cost, concentrated yield point of the metal damper, and limited seismic mitigation capacity. The present application provides a stratum seismic mitigation and isolation system and method.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the present application is as follows:

[0007] A seismic isolation system includes a liquid injection and extraction device for injecting or extracting liquid into a pebble stratum, and the pebble stratum has a certain volume and retains liquid therein, and the pebble stratum is used as a foundation for a building structure.

[0008] Pebble stratum as a complex geological condition widely exists in nature, and is often encountered in the construction process of actual engineering. Pebble stratum itself has good compaction performance, strong water permeability, high shear strength, and is not easy to liquefy under seismic load, etc. For the research of natural pebble stratum, researchers pay more attention to the investigation of the bearing capacity of pebble stratum or the construction method of pebble stratum reinforcement, but the research on how to improve the engineering characteristics of pebble stratum to make the pebble stratum have better seismic isolation performance has not been involved.

[0009] According to the experience of the tuned liquid damper arranged on the top of the structure, the displacement amplitude of the building structure under the action of seismic excitation decreases with the increase of the water quantity in the damper, which leads to the need to arrange too many tuned liquid dampers for the floor seismic mitigation system, resulting in high construction cost and large occupied space.

[0010] Pebble stratum usually contains a certain amount of water. If the pebble stratum is regarded as a deep water tuned frequency liquid damper, the influence of liquid sloshing damping on vibration control effect is more significant. Therefore, it is feasible to transform the water quantity of pebble stratum to achieve the effect of foundation seismic isolation, but how to effectively improve the liquid sloshing damping of pebble stratum is still a problem to be studied. Through research, it is found that when the sloshing frequency of water in the tuned liquid damper is close to or slightly less than the natural frequency of the building structure, the seismic control effect of the tuned liquid damper system is optimal. The sloshing frequency of liquid is positively correlated with the density of liquid, and the density of liquid is also positively correlated with the sloshing damping. Therefore, by changing the density of a certain volume of liquid, the required liquid sloshing frequency and damping can be obtained.

[0011] By controlling the liquid content of the closed pebble stratum, the mass of the entire pebble stratum can be changed, and the liquid sloshing damping is amplified. The pebble stratum as a tuned frequency liquid damper device can reduce the displacement amplitude of the building structure as a whole. The pebble stratum as a whole is mainly in the first vibration mode. When the first natural frequency of the pebble stratum is close to the first natural frequency of the building structure, the closed pebble stratum seismic isolation system will play a better control role.

[0012] Therefore, compared with the traditional damping system, the damping system has the following advantages: on the one hand, the natural pebble stratum is utilized, which has good bearing performance, large inter-particle pores and large water storage capacity; on the other hand, the mass of the pebble stratum (including the mass of the soil and stones and the mass of the liquid) is changed by pumping and injecting liquid into the pebble stratum with a certain volume, so as to adjust the inertial force of the pebble stratum and adjust the natural vibration frequency of the pebble stratum. The bearing performance of the pebble stratum is basically not changed when the inertial force of the pebble stratum is changed, the interaction between the pebble particles and the liquid between the particles is realized, the resonance effect and the liquid sloshing friction energy dissipation are realized through the movement of the pebble stratum, the vibration response of the building structure is reduced, the damping and energy dissipation efficiency of the system is greatly improved, the earthquake disaster is effectively reduced, and the phenomenon of sand liquefaction under the action of the earthquake of the natural pebble stratum is avoided. The device can directly utilize the characteristics of the natural pebble stratum to realize the damping and seismic isolation effect of the tuned liquid damper, is suitable for different foundation conditions, is convenient to construct, has good energy dissipation effect, and has groundbreaking engineering significance and practical value.

[0013] Preferably, the bottom of the pebble stratum is connected to a rock stratum, and a first water-blocking retaining wall is arranged around the pebble stratum and inserted into the rock stratum.

[0014] Alternatively, the bottom of the pebble stratum is connected to a rock stratum, a first water-blocking retaining wall is arranged around the pebble stratum, and a second water-blocking retaining wall is arranged in the pebble stratum and connected to the bottom of the first water-blocking retaining wall.

[0015] Through the above structure, the pebble stratum surrounded by the first water-blocking retaining wall and the rock stratum forms a closed structure, or the pebble stratum surrounded by the first water-blocking retaining wall and the second water-blocking retaining wall forms a closed structure, so that the pebble stratum with a certain volume is enclosed.

[0016] Further preferably, the top of the pebble stratum is connected to a soft clay layer.

[0017] Further preferably, the first water-blocking retaining wall is a diaphragm wall or a curtain grouting wall, which has mature construction technology and good water-blocking effect.

[0018] Further preferably, the second water-blocking retaining wall is a grouting layer.

[0019] Preferably, the pebble stratum includes gravel pebble coarse particles, fine sand particles and underground water, wherein the gravel pebble coarse particles serve as the main bearing carrier of the pebble stratum to ensure the strength requirement of the pebble stratum.

[0020] Further preferably, the particle size of the gravel pebble coarse particles is 6cm-20cm.

[0021] With the structure, the gravel and pebble coarse particles with a particle size of 6-20 cm can meet the shear strength and rigidity requirements of the shock absorption and isolation system.

[0022] Further preferably, the fine sand particles have a particle size of 0.075-6 cm.

[0023] Preferably, the liquid injection and extraction device comprises:

[0024] a liquid storage unit for storing standby liquid;

[0025] a power pump connected to the liquid storage unit and the pebble stratum, and used for injecting the standby liquid into the pebble stratum as pore liquid or for extracting the pore liquid into the liquid storage unit.

[0026] The liquid injection and extraction device can ensure that the water level of the pebble stratum is maintained within a certain range, avoid foundation settlement caused by the decline of underground water level, dynamically control the slurry content of the pebble stratum, and solve the technical problem of poor seismic performance of the building structure under the action of earthquake in complex stratum conditions.

[0027] Further preferably, the power pump is a bidirectional pump, which can be used for liquid injection and extraction.

[0028] Alternatively, the power pump is two one-way pumps, one of which is used for liquid injection and the other of which is used for liquid extraction.

[0029] Further preferably, the shock absorption and isolation system comprises a plurality of power pumps, which are connected in parallel and / or in series to improve the liquid pumping efficiency.

[0030] Further preferably, the power pump and the liquid storage unit are connected by a pipeline, and the power pump and the pebble stratum are connected by the pipeline.

[0031] Further preferably, a control valve is arranged on the pipeline between the power pump and the liquid storage unit to open and close the connection between the power pump and the liquid storage unit.

[0032] Further preferably, the shock absorption and isolation system further comprises a pipeline well, which penetrates into the pebble stratum.

[0033] Further preferably, the bottom of the pipeline well is lower than the underground water level in the pebble stratum.

[0034] Further preferably, the bottom of the pipeline well is located at a middle position to a bottom position in the depth direction of the pebble stratum.

[0035] Further preferably, the bottom of the pipe well is located at the middle of the depth direction of the gravel layer.

[0036] Further preferably, the pipe well is a borehole.

[0037] Further preferably, a well pipe is arranged in the pipe well, and the top end of the well pipe is connected to the power pump.

[0038] Further preferably, the bottom end of the well pipe is below the groundwater level.

[0039] Further preferably, a plurality of water permeation holes are arranged on the wall of the well pipe.

[0040] Further preferably, the water permeation holes are round holes or square holes.

[0041] Further preferably, the well pipe is a steel well pipe.

[0042] Further preferably, the shoe of the pipe well is connected to the steel well pipe by bolts or welding.

[0043] The construction method of the borehole is as follows: under the action of a gravity impactor, a hydraulic center drill realizes impact drilling, a reaming drill with expansion and contraction functions reams the well wall to form the pipe well, the outside of the reaming drill is provided with a shoe, the top end of the shoe is fixed to the well pipe by bolts or welding, and in the process of impact drilling, the well wall formed by the shoe and the well pipe sinks under the action of gravity, when the drilling depth reaches the designed position (middle position) in the gravel layer, the drill bit of the reaming drill is retracted, the reaming drill, the hydraulic center drill and the downhole impactor are pulled out of the pipe well to realize well completion, and the above steps are repeated to realize the array of the pipe wells.

[0044] Further preferably, the liquid storage unit comprises at least one liquid storage tank.

[0045] Further preferably, the standby liquid is water, polyester polyol liquid or polyhalide liquid.

[0046] Preferably, the shock absorption and isolation system further comprises a control device connected to the liquid pumping and injecting device, and the control device is used to control the liquid pumping and injecting device to inject or pump liquid into the gravel layer to control the mass of the gravel layer.

[0047] Further preferably, the control device comprises a computer.

[0048] Preferably, the shock absorption and isolation system further comprises a data monitoring device connected to the control device, the data monitoring device being used to monitor the displacement of the building structure under the action of seismic excitation and to monitor the mass of the pebble stratum, and to transmit the data of the displacement and the mass to the control device.

[0049] Through the control device and the data monitoring device, the data monitoring device can monitor the shock absorption effect of the pebble stratum on the building structure under the action of seismic excitation in real time, and feed back data to the control device in real time, and the control device controls the liquid injection and extraction device to inject or extract liquid into the pebble stratum according to the shock absorption effect, dynamically corrects the mass of the pebble stratum, and obtains the best shock absorption performance.

[0050] Further preferably, the data monitoring device comprises an acceleration sensor arranged on the building structure, and the displacement amplitude of the top layer and / or the interlayer displacement of the building structure under the action of seismic excitation is obtained through the acceleration sensor to monitor the displacement of the building structure under the action of seismic excitation.

[0051] Further preferably, at least one acceleration sensor is arranged on each floor.

[0052] Further preferably, the data monitoring device comprises a liquid density sensor arranged in the pebble stratum.

[0053] Since the volume of the pebble stratum is constant, the mass of the liquid can be increased by increasing the density of the liquid in the pebble stratum, thereby increasing the mass of the pebble stratum, and thus the mass of the pebble stratum can be indirectly calculated through the liquid density sensor by monitoring the liquid density in the pebble stratum.

[0054] Further preferably, the liquid density sensor is connected to the outer wall of the well pipe.

[0055] Further preferably, the data monitoring device comprises a liquid pressure sensor arranged in the pebble stratum.

[0056] Since the volume of the pebble stratum is constant, the mass of the liquid can be increased by increasing the volume of the pore liquid between the gravel and pebble coarse particles in the pebble stratum, thereby increasing the mass of the pebble stratum, and thus the mass of the pebble stratum can be indirectly calculated through the liquid pressure sensor by monitoring the water pressure in the pebble stratum to obtain the mass of the pebble stratum.

[0057] Further preferably, the liquid pressure sensor is arranged at the bottom of the pipe well.

[0058] The application also provides a construction method of a shock absorption and isolation system,

[0059] Method A, a first water retaining wall is set, which is inserted into the rock stratum through the pebble stratum, and a certain volume of the pebble stratum is formed in the first water retaining wall, which is used as the foundation of the building structure;

[0060] A well pipe is arranged in the first water retaining wall, which penetrates into the pebble stratum, and the top end of the well pipe is connected to a pipeline, which is connected to a liquid storage unit, and the liquid storage unit stores a standby liquid;

[0061] Alternatively, method B, a first water retaining wall is set, which is inserted into the pebble stratum, and the bottom of the first water retaining wall is closed by a second water retaining wall, and a certain volume of the pebble stratum is formed in the first water retaining wall and the second water retaining wall, which is used as the foundation of the building structure;

[0062] A well pipe is arranged in the first water retaining wall, which penetrates into the pebble stratum, and the top end of the well pipe is connected to a pipeline, which is connected to a liquid storage unit, and the liquid storage unit stores a standby liquid.

[0063] The construction method of the shock absorption and isolation system uses the natural pebble stratum and the natural rock stratum or only the natural pebble stratum, the first water retaining wall and the second water retaining wall can be constructed by using existing conventional technical means, which is convenient to construct and low in cost, and is suitable for different foundation conditions.

[0064] Preferably, the pipeline is connected to a power pump, the power pump is connected to the liquid storage unit, and the power pump is used to inject the standby liquid into the pebble stratum or to pump the pore liquid in the pebble stratum into the liquid storage unit.

[0065] Further preferably, the construction method further comprises the following steps:

[0066] The power pump is connected to a control device, the control device is connected to a data monitoring device, and the data monitoring device comprises an acceleration sensor, a liquid density sensor and a liquid pressure sensor;

[0067] The acceleration sensor is arranged on the building structure, and the liquid density sensor and the liquid pressure sensor are arranged in the pebble stratum.

[0068] Preferably, a pipeline well is constructed in the first water retaining wall, and a well pipe is arranged in the pipeline well.

[0069] The application also provides an implementation method of the shock absorption and isolation system as described in any one of the above,

[0070] The natural vibration period and / or the natural vibration frequency of the building structure are obtained.

[0071] obtaining the natural vibration period and / or the natural vibration frequency of the gravel stratum;

[0072] injecting or pumping liquid into the gravel stratum through the liquid injection and pumping device to change the mass of the gravel stratum, so as to change the natural vibration period and / or the natural vibration frequency of the gravel stratum, and make the natural vibration frequency of the gravel stratum reach [0.8, 1.2] of the natural vibration frequency of the building structure.

[0073] By using the implementation method of the shock absorption and isolation system, the natural vibration frequency of the gravel stratum can be close to the natural vibration frequency of the building structure, so that the gravel stratum with a certain volume is simulated as a super large tuned liquid damper, and the optimal shock absorption control effect is obtained.

[0074] Preferably, according to the natural vibration period and / or the natural vibration frequency of the building structure and the natural vibration period and / or the natural vibration frequency of the gravel stratum, the difference between the natural vibration period and / or the natural vibration frequency of the building structure and the natural vibration period and / or the natural vibration frequency of the gravel stratum is obtained.

[0075] According to the difference, the liquid injection or pumping into the gravel stratum through the liquid injection and pumping device is determined.

[0076] Preferably, a numerical model of the building structure is established, and modal analysis is performed to obtain the natural vibration period and / or the natural vibration frequency of the building structure.

[0077] Preferably, a numerical model of the gravel stratum is established, and modal analysis is performed to obtain the natural vibration period and / or the natural vibration frequency of the gravel stratum.

[0078] Preferably, after the natural vibration frequency of the gravel stratum reaches [0.8, 1.2] of the natural vibration frequency of the building structure, whether the gravel stratum with changed mass plays a shock absorption role is determined by monitoring the data indicators of the displacement amplitude of the top layer and / or the interlayer displacement of the building structure under the action of seismic excitation.

[0079] If the shock absorption effect does not reach the expectation, the dynamic correction of the mass of the gravel stratum is performed according to the data indicators.

[0080] The application further provides an electronic device, which comprises:

[0081] a memory having a computer program stored thereon;

[0082] a processor configured to execute the program in the memory to implement the implementation method of the shock absorption and isolation system according to any one of the above.

[0083] The application further provides a computer readable storage medium, which stores a computer program, and the program is executed by a processor to realize the implementation method of the seismic mitigation system according to any one of the above.

[0084] In summary, due to the adoption of the technical scheme, the application has the following beneficial effects:

[0085] 1. The seismic mitigation system utilizes natural pebble stratum, which has good bearing performance, large inter-particle pores and large water storage capacity; the mass of the pebble stratum can be changed by pumping or injecting liquid into the pebble stratum with a certain volume, so as to adjust the inertial force and the natural vibration frequency of the pebble stratum, change the inertial force of the pebble stratum without changing the bearing performance of the pebble stratum, and make the pebble particles interact with the liquid between the particles to play the resonance effect and the liquid sloshing friction energy dissipation through the movement of the pebble stratum, thereby reducing the seismic response of the building structure and greatly improving the energy dissipation efficiency of the system, effectively reducing the earthquake disaster, and avoiding the liquefaction of sand under the action of natural pebble stratum in the earthquake; the device can directly utilize the characteristics of the natural pebble stratum to realize the seismic mitigation effect of the tuned liquid damper, is suitable for different foundation conditions, is convenient to construct, has good energy dissipation effect, and has groundbreaking engineering significance and practical value.

[0086] 2. The seismic mitigation system ensures that the water level of the pebble stratum is maintained within a certain range through the pumping and injecting device, avoids the foundation settlement caused by the decrease of the underground water level, dynamically controls the slurry content of the pebble stratum, solves the technical problem of poor seismic performance of the building structure under the action of the earthquake, and has the advantages of simple operation, high economic efficiency, good energy dissipation effect, and the ability to ensure that the pebble stratum meets the expected energy dissipation requirement under the action of the earthquake, thereby effectively reducing the earthquake disaster degree of the building structure.

[0087] 3. The seismic mitigation system can realize real-time monitoring of the seismic mitigation effect of the pebble stratum on the building structure under the action of the earthquake through the control device and the data monitoring device, and real-time feedback of data to the control device; the control device controls the pumping and injecting device to inject or pump liquid into the pebble stratum according to the seismic mitigation effect, dynamically corrects the mass of the pebble stratum, and obtains the best seismic mitigation performance.

[0088] 4. The construction method of the seismic mitigation system utilizes the natural pebble stratum and the natural rock stratum, the first water-blocking retaining wall and the pipe well can be constructed by using existing conventional technical means, and the construction is convenient, the cost is low, and the method is suitable for different foundation conditions.

[0089] 5. The method for implementing the shock absorption and isolation system can make the self-vibration frequency of the pebble stratum close to the self-vibration frequency of the building structure, so that the pebble stratum with a certain volume is simulated as a super large tuned liquid damper, and the self-vibration frequency of the pebble stratum can be adjusted through implementation monitoring feedback, so that the optimal shock absorption control effect is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0090] Figure 1 is a structural diagram of the shock absorption and isolation system according to the present application Figure 1 ;

[0091] Figure 2 is a structural diagram of the shock absorption and isolation system according to the present application Figure 2 ;

[0092] Figure 3 is a control diagram of the shock absorption and isolation system according to the present application

[0093] Figure 4 is a comparison diagram of the shock absorption effect of the pebble stratum under different liquid levels (peak acceleration).

[0094] Figure 5 is a comparison diagram of the shock absorption effect of the pebble stratum under different liquid levels (displacement).

[0095] Figure: 1-soft clay layer, 2-pebble stratum, 3-rock layer, 4-gravel pebble coarse particles, 5-fine sand particles, 6-pore liquid, 7-flow direction, 8-pipeline, 9-pipeline well, 10-well pipe, 11-underground water level, 12-power pump, 13-liquid pressure sensor, 14-liquid density sensor, 15-acceleration sensor, 16-liquid storage unit, 17-backup liquid, 18-control valve, 19-control device, 20-building structure, 21-first water-blocking retaining wall, 22-second water-blocking retaining wall. DETAILED DESCRIPTION

[0096] The present application will be described in detail below with reference to the drawings.

[0097] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0098] Example 1

[0099] As shown in Figure 1 and 3 , the shock absorption and isolation system according to the present application comprises a pebble stratum 2 with a certain volume, a pipeline well 9, a liquid pumping and injecting device, a control device 19 and a data monitoring device, and the pebble stratum 2 retains liquid.

[0100] The pebble stratum 2 is used as the foundation of the building structure 20; the pebble stratum 2 comprises gravel pebble coarse particles 4, fine sand particles 5 and underground water, wherein the gravel pebble coarse particles 4 serve as the main load-bearing carrier of the pebble stratum 2 and ensure the strength requirement of the pebble stratum 2; the particle size of the gravel pebble coarse particles 4 is 6-20 cm, and the gravel pebble coarse particles 4 with the particle size of 6-20 cm meet the shear strength and stiffness requirements of the shock isolation system; the particle size of the fine sand particles 5 is 0.075-6 cm.

[0101] The bottom of the pebble stratum 2 is connected to the rock stratum 3, and the top of the pebble stratum 2 is connected to the soft clay layer 1; a first water-blocking retaining wall 21 is arranged around the pebble stratum 2, and the first water-blocking retaining wall 21 is inserted into the rock stratum 3; specifically, the first water-blocking retaining wall 21 is a underground continuous wall or a curtain grouting wall, which has mature construction technology and good water-blocking effect; through the above structure, the pebble stratum 2 surrounded by the first water-blocking retaining wall 21 and the rock stratum 3 forms a closed structure.

[0102] The pipe well 9 penetrates into the pebble stratum 2, the bottom of the pipe well 9 is lower than the underground water level 11 in the pebble stratum 2, and the bottom of the pipe well 9 is located at a middle position to a bottom position in the depth direction of the pebble stratum 2, preferably at the middle position; specifically, the pipe well 9 is a drilled well.

[0103] The liquid injection and extraction device is used for injecting or extracting liquid into the pebble stratum 2; the liquid injection and extraction device comprises a liquid storage unit 16, a power pump 12 and a well pipe 10 arranged in the pipe well 9; the power pump 12 and the liquid storage unit 16 are connected through a pipeline 8, and the power pump 12 and the well pipe 10 are connected through the pipeline 8; the liquid storage unit 16 is used for storing a standby liquid 17; the liquid storage unit 16 can comprise at least one liquid storage tank; the standby liquid 17 is water, polyester polyol liquid or polyhalide liquid; the power pump 12 is used for injecting the standby liquid 17 into the pebble stratum 2 as pore liquid 6 or for pumping the pore liquid 6 into the liquid storage unit 16; a control valve 18 is arranged on the pipeline 8 between the power pump 12 and the liquid storage unit 16 to open or close the connection between the power pump 12 and the liquid storage unit 16.

[0104] The top end of the well pipe 10 is connected to the power pump 12, and the bottom end of the well pipe 10 is lower than the underground water level 11; a plurality of water seepage holes are arranged on the wall of the well pipe 10, and the water seepage holes are round holes or square holes; specifically, the well pipe 10 is a steel well pipe.

[0105] As a preferred scheme of the embodiment, the power pump 12 is a bidirectional pump capable of being used for liquid injection and liquid extraction; or as a preferred scheme of the embodiment, the power pump 12 is two unidirectional pumps, one of which is used for liquid injection and the other of which is used for liquid extraction.

[0106] The shock absorption system can comprise a plurality of the power pumps 12, which are arranged in parallel and / or in series, so as to improve the liquid pumping efficiency.

[0107] The pipe shoe of the pipe well 9 is connected to the steel well pipe by bolts or welding, and the construction method of the drilling well is that the hydraulic center drilling tool realizes impact drilling under the action of the gravity impactor, the reamer with the expansion and contraction functions is used to expand the well wall to form the pipe well 9, the pipe shoe is arranged on the outer side of the reamer, the top end of the pipe shoe is fixed to the well pipe 10 by bolt connection or welding, and the well wall formed by the pipe shoe and the well pipe 10 sinks under the gravity in the process of impact drilling, when the drilling depth reaches the designed position (middle position) in the pebble stratum 2, the drill bit of the reamer is retracted, the reamer, the hydraulic center drilling tool and the down-the-hole impactor are taken out of the pipe well 9 to realize well completion, and the above steps are repeated to realize the array of the pipe well 9.

[0108] Through the liquid injection and extraction device, the water level of the pebble stratum 2 is ensured to be maintained within a certain range, the foundation settlement caused by the decrease of the underground water level 11 is avoided, the slurry content of the pebble stratum 2 can be dynamically controlled, the technical problem that the seismic performance of the building structure 20 under the seismic excitation is poor under the complex stratum condition is solved, the method is simple and easy to operate, has high economic efficiency and good energy dissipation and shock absorption effect, can ensure that the pebble stratum 2 meets the expected energy dissipation and shock absorption requirement under the seismic excitation, and effectively reduces the degree of seismic disaster of the building structure 20.

[0109] The control device 19 comprises a computer, is connected to the liquid injection and extraction device, and is used to control the power pump 12 to inject or extract liquid into the pebble stratum 2 to control the mass of the pebble stratum 2.

[0110] The data monitoring device is connected to the control device 19, comprises an acceleration sensor 15, a liquid density sensor 14 and a liquid pressure sensor 13, is used to monitor the displacement of the building structure 20 under the seismic excitation and monitor the mass of the pebble stratum 2, and transmit the data of the displacement and the mass to the control device 19.

[0111] The acceleration sensor 15 is arranged on the building structure 20, and for low-rise buildings, at least one acceleration sensor 15 can be arranged on each floor, and for high-rise buildings, at least three acceleration sensors 15 can be arranged on the upper floors respectively. The acceleration can be calculated by a computer to obtain the displacement, and the displacement amplitude of the top floor of the building structure 20 and / or the interlayer displacement can be obtained by the acceleration sensor 15 to monitor the displacement of the building structure 20 under the action of earthquake excitation.

[0112] The liquid density sensor 14 is arranged in the gravel layer 2, and specifically arranged on the outer wall of the well pipe 10. Since the volume of the gravel layer 2 is constant, the mass of the liquid can be increased by increasing the density of the liquid in the gravel layer 2, so as to increase the mass of the gravel layer 2. Therefore, the mass of the gravel layer 2 can be indirectly calculated by monitoring the density of the liquid in the gravel layer 2 by the liquid density sensor 14. Specifically, the mass of the entire gravel layer 2 can be calculated by the obtained liquid density, the injected liquid volume, and the volume and density of the gravel layer 2 which have been controlled in advance.

[0113] The liquid pressure sensor 13 is arranged in the gravel layer 2, and specifically arranged at the bottom of the pipe well 9. Since the volume of the gravel layer 2 is constant, the mass of the liquid can be increased by increasing the volume of the pore liquid 6 between the gravel and pebble coarse particles 4 in the gravel layer 2, so as to increase the mass of the gravel layer 2. Therefore, the mass of the gravel layer 2 can be obtained by indirectly calculating the height of the underground water level 11 by monitoring the water pressure in the gravel layer 2 by the liquid pressure sensor 13.

[0114] The control device 19 and the data monitoring device can monitor the damping effect of the gravel layer 2 on the building structure 20 under the action of earthquake excitation in real time, and feed back data to the control device 19 in real time. The control device 19 controls the injection and extraction of the liquid injection and extraction device into the gravel layer 2 according to the damping effect, dynamically corrects the mass of the gravel layer 2, and obtains the best damping performance.

[0115] Compared with the traditional damping system, the damping system has the following advantages: on the one hand, the natural pebble stratum 2 is utilized, which has good bearing performance, large inter-particle pores and large water storage capacity; on the other hand, the mass of the pebble stratum 2 can be changed by pumping and injecting liquid into the pebble stratum 2 of a certain volume, so as to adjust the inertia force of the pebble stratum 2 and adjust the natural vibration frequency of the pebble stratum 2, change the inertia of the pebble stratum 2 while basically not changing the bearing performance of the pebble stratum 2, make the pebble particles interact with the inter-particle liquid, and play the resonance effect and liquid sloshing friction energy dissipation through the movement of the pebble stratum 2, thereby reducing the vibration response of the building structure 20 and greatly improving the damping energy dissipation efficiency of the system, effectively reducing the earthquake disaster, and avoiding the sand liquefaction phenomenon under the action of the natural pebble stratum 2. The device can directly utilize the characteristics of the natural pebble stratum 2 to realize the damping and seismic isolation effect of the tuned liquid damper, and is suitable for different foundation conditions, has convenient construction, good energy dissipation effect, and has pioneering engineering significance and practical value.

[0116] Embodiment 2

[0117] As shown in Figure 2 and 3 , a damping and seismic isolation system, different from embodiment 1, in the embodiment, the bottom of the pebble stratum 2 is connected to the rock stratum 3, the first water-blocking retaining wall 21 is arranged around the pebble stratum 2, the second water-blocking retaining wall 22 is arranged in the pebble stratum 2, and the second water-blocking retaining wall 22 is connected to the bottom of the first water-blocking retaining wall 21, so that the pebble stratum 2 surrounded by the first water-blocking retaining wall 21 and the second water-blocking retaining wall 22 forms a closed structure.

[0118] Specifically, the first water-blocking retaining wall 21 is a underground continuous wall or a curtain grouting wall, and the second water-blocking retaining wall 22 is a grouting layer.

[0119] Embodiment 3

[0120] As shown in Figure 1 and 3 , a damping and seismic isolation system, different from embodiment 1, in the embodiment, the bottom of the pebble stratum 2 is connected to the rock stratum 3, the first water-blocking retaining wall 21 is arranged around the pebble stratum 2, the second water-blocking retaining wall 22 is arranged in the pebble stratum 2, and the second water-blocking retaining wall 22 is connected to the bottom of the first water-blocking retaining wall 21, so that the pebble stratum 2 surrounded by the first water-blocking retaining wall 21 and the second water-blocking retaining wall 22 forms a closed structure.

[0121] A, a first water-blocking retaining wall 21 is arranged, the first water-blocking retaining wall 21 penetrates into the rock stratum 3 through the pebble stratum 2, a pebble stratum 2 of a certain volume is formed in the first water-blocking retaining wall 21, the pebble stratum 2 has a pore liquid 6, and the pebble stratum 2 is used as a foundation of a building structure 20;

[0122] B, a pipe well 9 is arranged in the first water-blocking retaining wall 21, the pipe well 9 penetrates into the pebble stratum 2, and the bottom of the pipe well 9 is lower than the underground water level 11 in the pebble stratum 2;

[0123] C. A well pipe 10 is installed in the pipeline well 9. The bottom end of the well pipe 10 is lower than the groundwater level 11. The top end of the well pipe 10 is connected to the pipeline 8. The pipeline 8 is connected to the power pump 12. The power pump 12 is connected to the liquid storage unit 16. The liquid storage unit 16 stores spare liquid 17.

[0124] The power pump 12 is used to inject the backup liquid 17 into the pebble formation 2, or to pump the pore liquid 6 into the storage unit 16;

[0125] D. The power pump 12 is connected to the control device 19, and the control device 19 is connected to the data monitoring device. The data monitoring device includes an acceleration sensor 15, a liquid density sensor 14, and a liquid pressure sensor 13. The acceleration sensor 15 is installed on the building structure 20, and the liquid density sensor 14 and the liquid pressure sensor 13 are installed in the pebble stratum 2.

[0126] The construction method of the seismic isolation system described in this invention utilizes the natural pebble stratum 2 and the natural rock stratum 3. The first water-blocking retaining wall 21 and the pipeline well 9 can both be constructed using existing conventional techniques, which is convenient, low-cost, and suitable for different foundation conditions.

[0127] Example 4

[0128] like Figure 2 and 3 As shown, the construction method of the seismic isolation system of the present invention is used to construct the seismic isolation system as described in Example 2. The difference from Example 3 is that in this example, a first water-blocking retaining wall 21 is set up. The first water-blocking retaining wall 21 is inserted into the pebble stratum 2. The bottom of the first water-blocking retaining wall 21 is closed by a second water-blocking retaining wall 22. The first water-blocking retaining wall 21 and the second water-blocking retaining wall 22 enclose the pebble stratum 2 with a certain volume.

[0129] The construction method of the seismic isolation system described in this invention utilizes the natural pebble stratum 2. Both the first water-blocking retaining wall 21 and the second water-blocking retaining wall 22 can be constructed using existing conventional techniques, which is convenient, low-cost, and suitable for different foundation conditions.

[0130] Example 5

[0131] like Figures 1-5 As shown, the present invention provides a method for implementing a seismic isolation and damping system as described in Embodiment 1 or Embodiment 2.

[0132] Using numerical simulation software, a numerical model of the building structure 20 is established, and modal analysis is performed to obtain the natural period and / or natural frequency of the building structure 20.

[0133] A numerical simulation software is used to establish a numerical model of the pebble stratum 2, and modal analysis is performed to obtain the natural vibration period and / or natural vibration frequency of the pebble stratum 2;

[0134] The natural vibration period and / or natural vibration frequency of the pebble stratum 2 is compared with the natural vibration period and / or natural vibration frequency of the building structure 20 to obtain the difference between the natural vibration period and / or natural vibration frequency of the building structure 20 and the pebble stratum 2;

[0135] The control device 19 obtains the preset mass of the pebble stratum 2 according to the difference, controls the power pump 12 to inject or extract liquid into the pebble stratum 2, adjusts the liquid density and / or the height of the underground water level 11 of the pebble stratum 2, and adjusts the mass of the pebble stratum 2 to reach the preset value through monitoring by the liquid density sensor 14 and the liquid pressure sensor 13, so as to change the natural vibration period and / or natural vibration frequency of the pebble stratum 2 and make the natural vibration frequency of the pebble stratum 2 reach [0.8, 1.2] of the natural vibration frequency of the building structure 20.

[0136] Then, under the action of a seismic excitation, the displacement amplitude and / or inter-story displacement of the top layer of the building structure 20 are monitored by the acceleration sensor 15 to determine whether the pebble stratum 2 with the changed mass plays a damping role.

[0137] If the damping effect does not reach the expectation, the control device 19 controls the power pump 12 to inject or extract liquid into the pebble stratum 2 to dynamically correct the mass of the pebble stratum 2, and finally realizes the optimal damping performance.

[0138] As shown in FIGS. Figure 4 and 5 The comparison chart (peak acceleration and displacement) of the damping effect of the pebble stratum 2 under different liquid levels shows that, by using the liquid injection and extraction device to inject liquid into the pebble stratum 2, the damping effect of the pebble stratum 2 becomes more and more obvious with the passage of time, and the more liquid is injected, the more the mass of the pebble stratum 2 is increased, so that the natural vibration frequency of the pebble stratum 2 is close to the natural vibration frequency of the building structure 20, and the damping effect is quite obvious compared with the case without liquid injection.

[0139] The implementation method of the seismic mitigation system can make the natural vibration frequency of the pebble stratum 2 close to the natural vibration frequency of the building structure 20, so as to simulate the pebble stratum 2 with a certain volume into a super large tuned liquid damper, and obtain the optimal damping control effect.

[0140] Example 6

[0141] The electronic device described in the present application comprises:

[0142] a memory having a computer program stored thereon;

[0143] a processor configured to execute the program in the memory to implement the implementation method of the shock mitigation system as described in Embodiment 5.

[0144] As a preferred scheme of the present embodiment, the electronic device can comprise a processor, a memory, and can further comprise one or more of a multimedia component, an input / output (I / O) interface, and a communication component.

[0145] The processor is configured to control overall operations of the electronic device to complete all or part of the steps of the processing method or the display method described above.

[0146] The memory is configured to store various types of data to support operations of the electronic device, which can include, for example, instructions for any application or method operating on the electronic device, and application-related data; the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0147] The multimedia component can include a screen and an audio component, wherein the screen can be, for example, a touch screen, and the audio component is configured to output and / or input audio signals; for example, the audio component can include a microphone configured to receive external audio signals, and the received audio signals can be further stored in the memory or transmitted through the communication component; the audio component further includes at least one speaker configured to output audio signals.

[0148] The I / O interface provides an interface between the processor and other interface modules, which can be a keyboard, a mouse, a button, etc.; these buttons can be virtual buttons or physical buttons.

[0149] The communication component is used for wired or wireless communication between the electronic device and other devices; wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G or 5G, or a combination of one or more of them, so the corresponding communication component can include: Wi-Fi module, Bluetooth module, NFC module, mobile communication module.

[0150] As one preferred scheme of the embodiment, the electronic device can be implemented by one or more Application Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field Programmable Gate Array (FPGA), controller, microcontroller, microprocessor or other electronic elements, for executing the implementation method of the one seismic mitigation system.

[0151] Embodiment 7

[0152] The computer readable storage medium provided by the embodiment stores a computer program, and the program is executed by a processor to implement the implementation method of the one seismic mitigation system.

[0153] The computer readable storage medium provided by the embodiment can be the memory including program instructions as described in Embodiment 6, and the program instructions can be executed by the processor of the electronic device to complete the implementation method of the one seismic mitigation system.

[0154] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A seismic mitigation system, characterized by, The invention relates to a kind of deep water frequency-adjusting liquid damper, comprising a gravel stratum (2) with a certain volume and a liquid injection and extraction device, the liquid injection and extraction device is used to inject or extract liquid into the gravel stratum (2) to change the mass of the gravel stratum (2) and thus change the natural vibration period and / or frequency of the gravel stratum (2), so that the natural vibration frequency of the gravel stratum (2) reaches [0.8, 1.2] of the natural vibration frequency of the building structure (20), the gravel stratum (2) retains liquid, and the gravel stratum (2) is used as the foundation of the building structure (20), and the gravel stratum (2) is regarded as a deep water frequency-adjusting liquid damper.

2. The seismic mitigation system of claim 1, wherein, The bottom of the gravel stratum (2) is connected to a rock stratum (3), and a first water-blocking retaining wall (21) is arranged around the gravel stratum (2), and the first water-blocking retaining wall (21) is inserted into the rock stratum (3). Alternatively, the bottom of the gravel stratum (2) is connected to a rock stratum (3), a first water-blocking retaining wall (21) is arranged around the gravel stratum (2), and a second water-blocking retaining wall (22) is arranged in the gravel stratum (2), and the second water-blocking retaining wall (22) is connected to the bottom of the first water-blocking retaining wall (21).

3. The seismic mitigation system of claim 2, wherein, The top of the gravel stratum (2) is connected to a soft clay layer (1).

4. The seismic mitigation system of claim 2, wherein, The first water-blocking retaining wall (21) is a diaphragm wall or a curtain grouting wall.

5. The seismic mitigation system of claim 1, wherein, The gravel stratum (2) comprises gravel coarse particles (4), fine sand particles (5) and underground water.

6. The seismic mitigation system of claim 5, wherein, The particle size of the gravel coarse particles (4) is 6 cm-20 cm.

7. The seismic mitigation system of claim 5, wherein, The particle size of the fine sand particles (5) is 0.075 cm-6 cm.

8. The seismic mitigation system of claim 1, wherein, The liquid injection and extraction device comprises: a liquid storage unit (16) for storing standby liquid (17); a power pump (12) connected to the liquid storage unit (16) and the gravel stratum (2), and used to inject the standby liquid (17) into the gravel stratum (2) as pore liquid (6) or to extract the pore liquid (6) into the liquid storage unit (16).

9. The seismic mitigation system of claim 8, wherein, The power pump (12) is a bidirectional pump that can be used for liquid injection and extraction. Alternatively, the power pump (12) comprises two unidirectional pumps, one of which is used for liquid injection and the other of which is used for liquid extraction.

10. The seismic mitigation system of claim 8, wherein, A plurality of power pumps (12) are provided in parallel and / or in series.

11. The seismic mitigation system of claim 8, wherein, The power pump (12) and the liquid storage unit (16) are connected by a pipeline (8), and the power pump (12) and the gravel stratum (2) are connected by the pipeline (8).

12. The seismic mitigation system of claim 11, wherein, A control valve (18) is arranged on the pipeline (8) between the power pump (12) and the liquid storage unit (16).

13. The seismic mitigation system of claim 8, wherein, A pipeline well (9) is further provided, which penetrates into the gravel stratum (2).

14. The seismic mitigation system of claim 13, wherein, The bottom of the pipeline well (9) is located at a middle position to a bottom position in the depth direction of the gravel stratum (2).

15. The seismic mitigation system of claim 13, wherein, The pipeline well (9) is a drilled well.

16. The seismic mitigation system of claim 13, wherein, An well pipe (10) is arranged in the pipeline well (9), and the top end of the well pipe (10) is connected to the power pump (12).

17. The seismic mitigation system of claim 8, wherein, The liquid storage unit (16) comprises at least one liquid storage tank.

18. The seismic mitigation system of claim 8, wherein, The standby liquid (17) is water, polyester polyol liquid or polyhalide liquid.

19. The seismic mitigation system of any of claims 1-18, wherein, Further comprising a control device (19) connected to the liquid injection and extraction device, the control device (19) being configured to control the liquid injection and extraction device to inject or extract liquid into or from the pebble formation (2).

20. The seismic mitigation system of claim 19, wherein, The control device (19) comprises a computer.

21. The seismic mitigation system of claim 19, wherein, Further comprising a data monitoring device connected to the control device (19), the data monitoring device being configured to monitor the displacement of the building structure (20) under seismic excitation and to monitor the mass of the pebble formation (2) and to transmit data of the displacement and the mass to the control device (19).

22. The seismic mitigation system of claim 21, wherein, The data monitoring device comprises an acceleration sensor (15) arranged on the building structure (20).

23. The seismic mitigation system of claim 21, wherein, The data monitoring device comprises a liquid density sensor (14) arranged in the pebble formation (2).

24. The seismic mitigation system of claim 21, wherein, The data monitoring device comprises a liquid pressure sensor (13) arranged in the pebble formation (2).

25. A construction method of the seismic mitigation system according to any one of claims 1-24, wherein, Method A, a first water-blocking wall (21) is arranged, the first water-blocking wall (21) is inserted into the rock formation (3) through the pebble formation (2), a certain volume of the pebble formation (2) is formed in the circle of the first water-blocking wall (21), and the pebble formation (2) is used as the foundation of the building structure (20); A well pipe (10) is arranged in the circle of the first water-blocking wall (21), the well pipe (10) penetrates into the pebble formation (2), the top end of the well pipe (10) is connected to a pipeline (8), the pipeline (8) is connected to a liquid storage unit (16), and the liquid storage unit (16) stores a standby liquid (17); Alternatively, method B, a first water-blocking wall (21) is arranged, the first water-blocking wall (21) is inserted into the pebble formation (2), the bottom of the first water-blocking wall (21) is closed by a second water-blocking wall (22), the pebble formation (2) with a certain volume is enclosed by the first water-blocking wall (21) and the second water-blocking wall (22), and the pebble formation (2) is used as the foundation of the building structure (20); A well pipe (10) is arranged in the circle of the first water-blocking wall (21), the well pipe (10) penetrates into the pebble formation (2), the top end of the well pipe (10) is connected to a pipeline (8), the pipeline (8) is connected to a liquid storage unit (16), and the liquid storage unit (16) stores a standby liquid (17).

26. The method of construction according to claim 25, wherein, The pipeline (8) is connected to a power pump (12), the power pump (12) is connected to the liquid storage unit (16), and the power pump (12) is configured to inject the standby liquid (17) into the pebble formation (2) or to extract the pore liquid (6) in the pebble formation (2) into the liquid storage unit (16).

27. The construction method according to claim 26, wherein, The power pump (12) is connected to a control device (19), the control device (19) is connected to a data monitoring device, the data monitoring device comprises an acceleration sensor (15), a liquid density sensor (14) and a liquid pressure sensor (13); The acceleration sensor (15) is arranged on the building structure (20), and the liquid density sensor (14) and the liquid pressure sensor (13) are arranged in the pebble stratum (2).

28. The method of construction according to any one of claims 25-27, wherein, A pipe well (9) is arranged in the first water-blocking retaining wall (21), and a well pipe (10) is arranged in the pipe well (9).

29. A method for implementing the seismic mitigation system according to any one of claims 1-24, wherein, the natural vibration period and / or the natural vibration frequency of the building structure (20) are obtained; the natural vibration period and / or the natural vibration frequency of the pebble stratum (2) are obtained; the liquid in the pebble stratum (2) is pumped or injected by the liquid pumping and injecting device, so as to change the mass of the pebble stratum (2) and the natural vibration period and / or the natural vibration frequency of the pebble stratum (2), and the natural vibration frequency of the pebble stratum (2) reaches [0.8, 1.2] of the natural vibration frequency of the building structure (20).

30. The method according to claim 29, wherein, the difference between the natural vibration period and / or the natural vibration frequency of the building structure (20) and the natural vibration period and / or the natural vibration frequency of the pebble stratum (2) is obtained according to the natural vibration period and / or the natural vibration frequency of the building structure (20) and the natural vibration period and / or the natural vibration frequency of the pebble stratum (2); the liquid in the pebble stratum (2) is pumped or injected by the liquid pumping and injecting device according to the difference.

31. The implementation method of claim 29, wherein, a numerical model of the building structure (20) is established, and modal analysis is performed to obtain the natural vibration period and / or the natural vibration frequency of the building structure (20).

32. The implementation method of claim 29, wherein, a numerical model of the pebble stratum (2) is established, and modal analysis is performed to obtain the natural vibration period and / or the natural vibration frequency of the pebble stratum (2).

33. The method according to any one of claims 29-32, wherein, after the natural vibration frequency of the pebble stratum (2) reaches [0.8, 1.2] of the natural vibration frequency of the building structure (20), whether the pebble stratum (2) with the changed mass plays a role in seismic mitigation is determined by monitoring the data indexes of the displacement amplitude of the top layer and / or the interlayer displacement of the building structure (20) under the action of seismic excitation; if the seismic mitigation effect is not as expected, the mass of the pebble stratum (2) is dynamically modified according to the data indexes.

34. An electronic device, comprising: comprise: a memory having a computer program stored thereon; a processor configured to execute the program in the memory to implement the method according to any one of claims 29-33.

35. A computer readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the method according to any one of claims 29-33.

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