System and method for automatically monitoring large deformation and settlement of soft soil foundation subgrade

Abstract

The invention relates to a system and method for automatically monitoring large deformation and settlement of soft soil foundation subgrade. The system comprises a sensor, a data acquisition and processing module, a communication module and a PC; the sensor is a silicon piezoresistive sensor used for measuring the liquid pressure intensity in a measuring point position; the sensor is connected into the data acquisition and processing module; the data acquisition and processing module is communicated with the PC through a communication module on the basis of an internet, GPRS or a satellite. Inthe system, the PC is used for comparing the depth corresponding to a test sensor with the depth corresponding to a reference sensor to obtain the settlement amount of a measuring point of the test sensor. The system has the characteristics of high precision, wide temperature range, wireless digital output, low power consumption and high reliability and can meet the large deformation and settlement requirements of the soft soil foundation subgrade, be subjected to multi-layer and multi-point layout, monitor for a long time in an all-weather manner and overcome the defects that a conventionaldeformation monitoring sensor is too small in measuring range, and after the completion of pavement construction, subgrade settlement monitoring is unsuitable for being continuously performed.

Description

technical field [0001] The invention relates to the fields of road engineering technology and electronic information and automation, in particular to an automatic monitoring system and method for large deformation subsidence of soft soil foundation. Background technique [0002] Subgrade settlement monitoring on soft soil foundation is an important measure for subgrade stability and engineering quality control. Through systematic and continuous settlement observation and analysis, grasp the subgrade settlement trend, control the filling rate to ensure the stability of the subgrade, determine the overload preload strength, unloading and road construction time, predict the degree of foundation consolidation, and provide for the measurement of settlement earthwork increment According to etc. [0003] At present, the subgrade settlement monitoring method for soft soil foundations at home and abroad is the settlement plate method (the form of the settlement plate includes rod ty...

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Problems solved by technology

[0003] At present, the subgrade settlement monitoring method for soft soil foundations at home and abroad is the settlement plate method (the form of the settlement plate includes rod type, sleeve type, water cup type, etc.), which is labor-intensive, time-consuming, and the observation accuracy is not high It often interferes with construction machinery, and the observation accuracy is greatly affected by human factors

The roadbed settlement monitoring sensors currently used in the market often have a small range, most of which are tens of centimeters, which cannot meet the large deformation settlement monitoring of soft soil foundation roadbeds (up to 1m or more)

The latest development of GPS technology to monitor subgrade settlement can only monitor the subsidence of the surface, but cannot measure the subsidence of different layers inside the subgrade.

To sum up, the existing monitoring technology is difficult to meet the requirements of the rapid development of highway construction in soft soil areas, so improving the settlement monitoring method is an urgent problem to be solved in practical engineering

[0004] Therefore, it is necessary to develop an automatic roadbed settlement system with high precision, large range, small size, no interference with construction and traffic, remote monitoring and management, and real-time monitoring of total settlement and layered settlement of soft soil foundations in harsh natural environments. The monitoring system can solve the current labor-intensive and time-consuming monitoring of subgrade settlement on soft soil foundations, and the mutual interference between monitoring equipment and construction machinery, improve monitoring accuracy, and reduce workload and labor intensity

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