On-site roadbed dynamic response testing method and system thereof

Abstract

The invention discloses an on-site roadbed dynamic response testing method and a system thereof. The method comprises the following steps: a)selecting a road structure with flat physical features and straight route as test road; b)layering and burying a sensor according to inverted L shape arrangement on the cross section at center of test road, horizontally leading a transmission cable connected to the sensor out; c)after construction of the roadbed is completed, selecting a phase in a roadbed end face, a base end face and a surface layer end face; d)connecting a transmission cable interface to a dynamic / static strain acquisition analysis system, connecting a laptop and data acquisition processing software; and e)driving a road roller or a heavy type lorry according to different running states, collecting the roadbed dynamic response and environment change data at different road construction and operation periods. The system is composed of a road structure, a traffic dynamic load system, an information sensing system and a data acquisition system. The system has the advantages of simpleness, convenient enforcement, high efficiency method, and the system and the method can be widely used in roadbed dynamic response test research of stage 1 during road construction and operation periods.

Description

technical field [0001] The invention belongs to the technical field of highway subgrade testing, and specifically relates to a method for on-site testing of roadbed dynamic response during road construction and operation, and also relates to a test system for on-site testing of roadbed dynamic response during road construction and operation, which is suitable for general road subgrades , especially the testing and scientific research on the construction technology, design index and long-term performance of special filler subgrade. Background technique [0002] The subgrade is an important component of the highway structure. It bears the traffic dynamic load during the road construction and operation period. The long-term action of the dynamic load causes the structural performance of the highway subgrade pavement to attenuate and even deform and destroy. Therefore, the research on the dynamic characteristics of the subgrade is particularly important. Simulation, theoretical ...

AI Technical Summary

Problems solved by technology

On the one hand, the sensors buried in the roadbed are mainly dynamic earth pressure boxes, and the sensor type is single. Practice shows that the dynamic earth pressure of the roadbed is greatly affected by system vibration, especially when the buried depth reaches a certain depth. It is basically difficult to obtain data in the range below the roadbed, and other The sensors are calibrated together, and the dynamic response of the subgrade is greatly affected by the internal temperature and humidity environment, so it is necessary to observe the environmental information at the same time

On the other hand, the existing subgrade dynamic test structure and method are not systematic enough, and basically only involve the dynamic response information of the subgrade under the driving load when the road is built, and the structural performance of the subgrade is constantly decaying. Sensors have been used many times to test the dynamic stress information of the subgrade. In addition, when optimizing the technical parameters of road subgrade filling, especially special filler subgrade construction, it is also necessary to use sensors to monitor the dynamic characteristics of the subgrade under the action of compaction equipment. However, the existing testing systems and methods do not have Combining the roadbed dynamic test during the highway construction period and the operation period, so the utilization rate of sensors is low, and the information of the roadbed dynamic response test is not systematic and comprehensive enough

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