Lifecycle health monitoring and assessment system of soft soil subgrade for expressways in China

Abstract The life cycle includes the “planning stage – construction stage – operation stage” of a project. For soft soil subgrade, life-cycle quality management refers to the construction stage and operation stage. The health of soft soil subgrade in the operation stage cannot be separated from the influence of other factors, such as maintenance technology, operation management and construction technology. Only relying on the monitoring data of the construction stage cannot satisfy the requirements of comprehensive evaluation of soft soil subgrade. Currently, there is no perfect information management system to store, process and analyse all the index data from construction stage to the operation stage. This paper puts forward indexes that are suitable for evaluating the health of soft soil subgrade. Among all these indexes, we selected 8 indexes to evaluate the construction stage subgrade health, and chose 13 indexes to evaluate the operation stage subgrade health. In this paper, the Analytic Hierarchy Process was employed to structure the judgment matrix of each level indexes and calculate the weight of each index. In this way, we established soft soil subgrade life-cycle health assessment system. We found that construction stage and operation stage contribution the weight of 30% and 70% to the health of expressways soft soil subgrade lifecycle. Respectively, for construction stage subgrade health, the greatest influence come from apparent indexes and weight reached 0.75. For operating stage subgrade health, the greatest influence come from internal indexes and weight reached 0.5813. The assessment system was used to evaluate and analyse the health condition of an expressway section with soft soil subgrade. It is found that slope problem is the main problem that affects the health of the soft soil subgrade in this section. Based on the situation, suggestions for improving the health of the subgrade and key points being noted in future operation are given.

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