What are the evaluation indexes for a tunnel project?

The determination coefficient (R2), ACC, and standard deviation of prediction error (STD) are selected as the evaluation indexes for the task's performance. 4. Dataset construction This section introduces a tunnel project involving the collection of multi-source data during construction.

How is rock quality assessed during geological investigation for tunnel engineering?

During the geological investigation for tunnel engineering, the surrounding rock quality is assessed by core drill evaluations conducted along the tunnel alignment. The number of cores drilled in mountain tunnel projects is generally fewer than those in urban tunnels due to cost and surface environmental constraints.

What data is collected during tunnel construction?

During tunnel construction, multi-source data are collected, such as tunnel geotechnical investigation data, construction logs, MWD data, tunnel face photographs, and rock strength test data (Fig. 9 (a)). In large-span tunnels, the tunnel face often exhibits heterogeneity in rock mass classification, necessitating portion-specific evaluation.

How can advanced geological prediction technology be used in tunnel excavation?

Therefore, advanced geological prediction technologies, including advanced borehole drilling, ground penetrating radar, and tunnel seismic prediction technology, have been developed to provide early warnings for geological risks during tunnel excavation.

How long is the yangjiawopu tunnel?

4.1. Project overview Field investigations and testing were conducted at the Yangjiawopu twin-tube highway tunnel in Xinglong City, Hebei Province, China. The tunnel has a total length of 5.1 km, with a cross-sectional width of 15.93 m and a height of 11.84 m (Fig. 8 (a)).