Method for monitoring safety status of foundation pit

Abstract

The invention relates to underground engineering construction, in particular to a method for monitoring safety status of a foundation pit. Monitoring points which are capable of mutually corroboratingare arranged on a same section of the foundation pit in the invention method to monitor and obtain monitoring values of each monitoring project when the foundation pit is constructed to the current working condition; the safety status of the foundation pit at present can be quantitatively measured by comparing the monitored data with a limit status; deformation and force condition of foundation pit in next step is obtained through prediction; the safety status of the foundation pit in the next step of construction is evaluated by the way of comparing with the limit status, thus realizing theprediction the of safety status of the foundation pit and transforming the safety status evaluation of the foundation pit from post-evaluation to pre-evaluation. The invention has the advantages thatdynamic monitoring evaluation of the safety status of the foundation pit is realized by replacing absolute evaluation with relative evaluation and combing the data evaluation result obtained by monitoring with evaluation result obtained by adopting prediction; the quantitative monitoring evaluation of the safety status of the foundation pit is realized and the specific risk points are confirmed; the safety status of the foundation pit in the current and in the next step of construction is predicted systematically; the invention has great significance to the safety control over the constructionof the foundation pit.

Description

technical field [0001] The invention relates to underground engineering construction, in particular to a method for monitoring the safety state of foundation pits. Background technique [0002] The safety status monitoring of foundation pit engineering has not yet found a scientific and reasonable method. At present, during foundation pit monitoring, the alarm value is generally proposed based on design and construction experience. If the monitoring result of the foundation pit reaches the alarm value, it is considered that the foundation pit is in an unsafe state, and attention should be paid, or corresponding countermeasures should be taken. Generally, the set alarm value is low, and the monitoring value can easily reach the alarm value during actual construction, and most of the foundation pits have no safety problems. This situation causes the construction unit to lack analysis and judgment on the monitoring results, and it is easy to reach the alarm value, which makes ...

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Problems solved by technology

In addition, this safety state evaluation method can only evaluate the safety state of individual monitoring items, such as inclination deformation, support axial force or house settlement, and does not systematically evaluate the overall safety state of the entire foundation pit.

[0003] Since there is no quantitative method to evaluate the current safety state of the

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