Abstract
Field tests were carried out on the compacted lateritic soil subgrade of Laibin-Mashan expressway in Guangxi Province to obtain the vertical vibration acceleration and dynamic stress amplitude of each test point under different axle loads and different driving speeds. The distribution law of the dynamic response and its frequency domain characteristics obtained by wavelet analysis emerged. The vibration of the subgrade is clearly aggravated by the increase of speed and load. Specifically, the acceleration of vehicle speed from 20 km/h to 40 km/h has a prominent effect on the vibration of subgrade, and the influence of speed on the vibration of subgrade decreases with subgrade depth. The acceleration has the greatest impact on the vibration energy in the third and fourth frequency bands.
Highlights
As an important part of the expressway, the subgrade bears the dynamic traffic loads during construction, which is characterized by heavy vehicle loads, high frequency of vehicle traffic, and varying speed between 20 km/h and 60 km/h
In situ testing methods collect in situ test data by burying sensors and field measurement and determine the law of the internal dynamic Earth pressure and vibration acceleration change with time and space
Compared with theoretical calculation and numerical simulation, in situ test has higher pertinence and intuitive data, which is the most direct and effective means to study the dynamic characteristics of subgrade [10]
Summary
Received 19 August 2020; Revised 19 September 2020; Accepted 12 October 2020; Published 24 October 2020. Field tests were carried out on the compacted lateritic soil subgrade of Laibin-Mashan expressway in Guangxi Province to obtain the vertical vibration acceleration and dynamic stress amplitude of each test point under different axle loads and different driving speeds. E distribution law of the dynamic response and its frequency domain characteristics obtained by wavelet analysis emerged. E vibration of the subgrade is clearly aggravated by the increase of speed and load. The acceleration of vehicle speed from 20 km/h to 40 km/h has a prominent effect on the vibration of subgrade, and the influence of speed on the vibration of subgrade decreases with subgrade depth. E acceleration has the greatest impact on the vibration energy in the third and fourth frequency bands The acceleration of vehicle speed from 20 km/h to 40 km/h has a prominent effect on the vibration of subgrade, and the influence of speed on the vibration of subgrade decreases with subgrade depth. e acceleration has the greatest impact on the vibration energy in the third and fourth frequency bands
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