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A comprehensive evaluation method for the safety of internally supported building foundation pits

A comprehensive evaluation and safety technology, applied in construction, excavation, infrastructure engineering, etc., can solve the problems of rough safety evaluation methods, poor operability, and strong theory, so as to quickly confirm the safety of foundation pits and scientifically High and systematic effect

Active Publication Date: 2022-01-25
汕头市建设工程质量与安全中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of foundation pits excavated in the field of construction engineering, especially the foundation pits excavated on coastal soft soil foundations. The method of safety evaluation during the excavation process and after the completion of the excavation is relatively rough, strong in theory and pertinent Weak, poor operability and other shortcomings, an evaluation method based on fuzzy comprehensive evaluation method is proposed

Method used

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  • A comprehensive evaluation method for the safety of internally supported building foundation pits
  • A comprehensive evaluation method for the safety of internally supported building foundation pits
  • A comprehensive evaluation method for the safety of internally supported building foundation pits

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Effect test

Embodiment 1

[0063] A commercial plaza project is located in the bustling area of ​​the city, surrounded by main traffic roads and important office buildings, and the municipal pipeline has been buried under the road. The importance of foundation pit construction safety is high. The area of ​​the foundation pit is about 14,200 square meters, and the circumference is about 460m. The excavation depth of the foundation pit is between 15.0m and 19.6m, which is the deepest foundation pit project in the local history. The reinforced concrete inner support is used as the supporting structure for the foundation pit, and the surrounding structure is constructed by reinforced concrete pouring piles and cement mixing piles.

[0064] It is determined that the foundation pit is designed as a first-level foundation pit, and the first-level influencing factors include the deformation of the enclosure structure, the deformation of the inner support structure, the deformation of the surrounding buildings ...

Embodiment 2

[0081]A large-scale high-rise residential building project consists of 20 residential buildings with 32-40 floors and a second-floor basement. The foundation pit is irregular in shape, the excavation depth is about 7.60m, and the elevation of the bottom surface of the foundation pit (including the bottom plate and cushion thickness) is -10.40m. The area is about 83,000 square meters, and the excavation area of ​​the foundation pit is the largest area of ​​the project implemented in the local area; the supporting structure of the foundation pit adopts the prestressed bolt support structure, which is adopted for the first time in the local area. The safety level of the side wall of the foundation pit support structure is Class II. Combined with the surrounding environment and geological conditions, single or double rows of bored piles, cement mixing piles, reinforced concrete internal support structures, and prestressed anchor support structures are used in different areas. Two ...

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Abstract

The invention discloses a comprehensive evaluation method for the safety of foundation pits of internally supported buildings. The steps are as follows: (1) determining each primary impact factor and secondary impact factor of the foundation pit safety evaluation, and constructing a secondary fuzzy comprehensive evaluation model; (2) ) According to the alarm value and control value (or design value) provided by the foundation pit design unit, divide each secondary impact factor into four grades; (3) determine the monitoring position of each secondary impact factor and measure the monitoring value, and classify The partitioning results in distribution coefficients in four classes. The membership degree matrix of the second-level impact factors is composed of distribution coefficients, and the membership degree of each first-level impact factor is calculated; (4) The foundation pit safety classification standard is established, which is divided into four levels; (5) The membership of each first-level impact factor degree to form a matrix, and calculate the membership degree X of the overall fuzzy comprehensive evaluation of the foundation pit; (6) Calculate the evaluation value = X·Q T , the evaluation of the safety state of the foundation pit is obtained by using the attribution of the evaluation value in the classification of the safety level of the foundation pit.

Description

technical field [0001] The invention belongs to the technical field of building site construction, in particular to the technical field of monitoring and comprehensive evaluation for maintaining the safety of building foundation pits. Background technique [0002] Under the background of economic development and urbanization process, China's urban buildings are showing a trend of high-altitude and underground development. Especially for some large-scale comprehensive buildings or building groups, the designed underground space has a large span and a large number of floors, so the foundation pit engineering has the characteristics of large area, high depth and difficult maintenance. Some foundation pit projects are located in the bustling area of ​​the city, surrounded by heavy traffic, dense buildings and dense underground pipelines, resulting in not only the safety and stability of the foundation pit itself, but also problems caused by earthwork excavation. The movement of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06Q10/06G06Q50/08E02D17/02
CPCG06Q10/06393G06Q50/08E02D17/02G06F30/13
Inventor 袁继雄陈志远蔡耿
Owner 汕头市建设工程质量与安全中心
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