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CN-122015964-A - Foundation pit quality monitoring method and system for building engineering

CN122015964ACN 122015964 ACN122015964 ACN 122015964ACN-122015964-A

Abstract

The invention discloses a foundation pit quality monitoring method and system for constructional engineering, which relates to the technical field of constructional engineering safety monitoring, wherein the monitoring method comprises data acquisition, space-time alignment, dynamic coupling analysis, hierarchical early warning decision and blockchain existence check, and has the advantages that: the combination of the multi-source sensing network space-time alignment method and the soil-structure-water flow dynamic coupling model realizes the collaborative monitoring and coupling analysis of displacement, soil pressure, groundwater and the like, the space-time alignment technology eliminates the sensor clock drift and the space positioning error, the dynamic coupling model fully reflects the complex response of a foundation pit system under different working conditions through the self-adaptive weight distribution of a construction stage, the limitation of the traditional single-parameter monitoring is overcome, the monitoring result is more fit with the engineering practice, and the method is suitable for various geological conditions and foundation pit depth scenes.

Inventors

  • Hao Peifang
  • LI PENG
  • WANG JINGJING
  • LI HUIZHEN

Assignees

  • 山西鸿昌建设工程有限公司

Dates

Publication Date
20260512
Application Date
20260204

Claims (9)

  1. 1. The foundation pit quality monitoring method for the constructional engineering comprises a monitoring method and is characterized by comprising the following steps of: step one, data acquisition, namely deploying sensor nodes on foundation pit support piles, edges and underground water level pipes, and acquiring displacement, soil pressure and water level data; secondly, time-space alignment, namely realizing time synchronization through a temperature compensation crystal oscillator and a UWB positioning module, and carrying out space normalization by adopting a coordinate transformation matrix; step three, dynamic coupling analysis, namely constructing a soil-structure-water flow dynamic coupling model, and distributing parameter weights according to construction stages; step four, hierarchical early warning decision, namely calculating an early warning threshold value based on a reference threshold value and a dynamic adjustment coefficient, and triggering a III-level response mechanism; And fifthly, blocking chain certification, namely, the original data, the risk level and the time stamp are uplink, and real-time data hash and on-chain record verification integrity are compared through intelligent contracts.
  2. 2. The method for monitoring the quality of a foundation pit in a building engineering according to claim 1, wherein the time synchronization algorithm in the second step comprises the steps of extracting time stamps of all sensors, calculating a reference time median, and applying a linear compensation model , wherein, In order to correct the time-offset after the correction, As a result of the original time-offset, Is a temperature coefficient of the silicon carbide material, The temperature deviation is the difference between the measured temperature and 25 ℃ and is in the range of 0.00008ppm/°c to 0.00012ppm/°c.
  3. 3. The method for monitoring the quality of the foundation pit of the building engineering according to claim 2, wherein the space coordinate normalization in the second step adopts matrix transformation: ; Wherein, the For the transformed coordinates of the target coordinate system, the normalized coordinates of the sensor data under the local coordinate system of the foundation pit are represented, Is a trigonometric function term for realizing the rotation of the coordinate around the Z axis The angle of the corner of the plate, The coordinates are originally acquired for the sensor, Is the origin of the local coordinate system of the foundation pit, Is the included angle between the main edge of the foundation pit and true north.
  4. 4. The method for monitoring the quality of a foundation pit of a building engineering according to claim 1, wherein the multi-physical field coupling equation of the dynamic coupling model in the third step is as follows: ; Wherein, the In order to support the displacement of the pile, For the pore water pressure, Is the pressure of the soil, and the pressure of the soil, In order to support the horizontal displacement of the pile, In order for the pore water to be at a pressure, Is the vertical earth pressure, Is the internal friction angle of the soil body, 、 Is the coupling coefficient.
  5. 5. The method for monitoring the quality of a foundation pit in a building engineering according to claim 1, wherein the dynamic threshold calculation formula in the fourth step is: ; Wherein, the As a reference threshold value, In order to excavate the depth factor, As a coefficient of sensitivity to seepage, For the current duration of the excavation, Is soil creep time constant.
  6. 6. The method for monitoring the quality of a foundation pit of a building engineering according to claim 1, wherein the blockchain certification process in the fifth step comprises the following steps: original data encryption hash, storing hash value and time stamp on a chain, comparing new data hash with record on the chain in real time by an intelligent contract, and triggering tamper alarm when the new data hash is inconsistent; and the block chain certification flow meets the requirement of ISO 19650 standard on data tracing.
  7. 7. The foundation pit quality monitoring system for construction engineering according to any one of claims 1-6, wherein the monitoring system comprises the following modules: the sensing layer comprises a supporting pile inclinometer, a soil pressure box and a water level gauge, and a temperature compensation crystal oscillator and UWB positioning module are arranged in the sensing layer; the analysis layer comprises a space-time alignment unit, a soil-structure-water coupling calculation unit and an adaptive threshold calculation unit; the decision layer is used for configuring a III-level response module, executing I-level audible and visual alarm, construction suspension, II-level short message notification and III-level platform marking; And the block chain certification module is used for storing the original sensor data and the calibration record hash, and realizing real-time warning of data tampering through intelligent contracts.
  8. 8. The foundation pit quality monitoring system for constructional engineering according to claim 7, wherein the soil-structure-water coupling calculation unit of the analysis layer is internally provided with a construction stage identification submodule, the weight distribution scheme is automatically switched through excavation depth and precipitation rate, and a finite element solver is called to calculate a coupling equation, so that the error range is less than or equal to +/-0.5 mm.
  9. 9. The foundation pit quality monitoring system for constructional engineering according to claim 8, wherein the reference station of the sensing layer is arranged in a stable area outside the foundation pit, a total station prism is arranged for calibrating drift errors of the UWB positioning module, the calibration period is 24-48 h, and the positioning accuracy after calibration is maintained within a range of +/-5 cm- +/-15 cm.

Description

Foundation pit quality monitoring method and system for building engineering Technical Field The invention relates to the technical field of building engineering safety monitoring, in particular to a foundation pit quality monitoring method and system for building engineering. Background The foundation pit engineering is a key link of building construction, the quality safety of the foundation pit engineering is directly related to the stability of a main structure and the safety of surrounding environments, the current foundation pit monitoring is mostly dependent on single parameter acquisition or manual inspection, the problems of data fragmentation, insufficient instantaneity and the like exist, the dynamic coupling effect of soil pressure, groundwater and structural deformation under complex geological conditions is difficult to comprehensively reflect, and risk early warning is delayed; the existing monitoring system generally lacks a space-time cooperative mechanism of multi-source data, the data fusion precision is greatly influenced by sensor clock drift and space positioning deviation, meanwhile, the early warning threshold value is a fixed value, the self-adaptive construction stage change is impossible, false alarm or missing alarm is easy to occur, in addition, the manual recording mode of the monitoring data has a falsification risk, and the requirements of engineering quality tracing and responsibility identification are difficult to meet. Disclosure of Invention The invention aims to provide a foundation pit quality monitoring method and system for construction engineering. In order to achieve the purpose, the invention provides the technical scheme that the foundation pit quality monitoring method for the constructional engineering comprises a monitoring method, wherein the monitoring method comprises the following steps of: step one, data acquisition, namely deploying sensor nodes on foundation pit support piles, edges and underground water level pipes, and acquiring displacement, soil pressure and water level data; Secondly, time-space alignment, namely realizing time synchronization by a temperature compensation crystal oscillator (the precision range is +/-0.05 ppm to +/-0.15 ppm) and a UWB positioning module (the precision range is +/-5 cm to +/-15 cm), and carrying out space normalization by adopting a coordinate transformation matrix; Step three, dynamic coupling analysis, namely constructing a soil-structure-water flow dynamic coupling model, and distributing parameter weights (displacement weight 0.6, water pressure weight 0.3, soil pressure weight 0.1 in the excavation period, displacement weight 0.2, water pressure weight 0.7, soil pressure weight 0.1 in the precipitation period, displacement weight 0.4, water pressure weight 0.2 and soil pressure weight 0.4 after the bottom plate is poured) according to the construction stage; Step four, grading early warning decision, namely calculating an early warning threshold based on a reference threshold and a dynamic adjustment coefficient (the excavation depth coefficient k1 is increased by 0.04 to 0.06 for every 1m deepening, the soft soil stratum is taken to 0.06, the sandy soil stratum is taken to 0.04, the seepage sensitivity coefficient k2 is the silt soil 0.002 to 0.004), and triggering a III-level response mechanism; And fifthly, blocking chain certification, namely, the original data, the risk level and the time stamp are uplink, and real-time data hash and on-chain record verification integrity are compared through intelligent contracts. The time synchronization algorithm in the second step comprises the steps of extracting the time stamp of each sensor, calculating the median of the reference time and applying a linear compensation model, wherein,In order to correct the time-offset after the correction,As a result of the original time-offset,Is a temperature coefficient of the silicon carbide material,The temperature deviation is the difference between the measured temperature and 25 ℃ and is in the range of 0.00008ppm/°c to 0.00012ppm/°c. The invention further provides a scheme that the space coordinate normalization in the second step adopts matrix transformation: ; Wherein, the The transformed coordinates (unit: m) of the target coordinate system represent normalized coordinates of the sensor data in the foundation pit local coordinate system,Is a trigonometric function term for realizing the rotation of the coordinate around the Z axisThe angle of the corner of the plate,The coordinates are originally acquired for the sensor,Is the origin of the local coordinate system of the foundation pit,Is the included angle between the main edge of the foundation pit and true north. The invention further provides a multi-physical field coupling equation of the dynamic coupling model in the third step, which is as follows: ; Wherein, the In order to support the displacement of the pile,For the pore water pressure,Is the pressure of t