On November 18, the shield tunneling machine "Xing'an No. 2" broke through the ground, and the right line of the Yuanshan Station to Longxing Station section of Phase II of Shenzhen Metro Line 16, constructed by China Railway 14th Bureau Group, was successfully holed through, marking the achievement of dual-line breakthrough for the longest section of the entire line.

The right line of the Yuanshan Station to Longxing Station section has a total length of 1,107.8 meters, mainly passing through gravelly cohesive soil, strongly weathered sandstone, and slightly weathered marble strata. The rock surface in the section fluctuates greatly, and karst is strongly developed. The section passes beneath Yuanshan with a small-radius curve. During the mountain-crossing stage, factors such as "large burial depth," "high water pressure," "small radius," and "easy loss of backfill grouting" are superimposed, making shield tunneling highly difficult.

To ensure smooth shield tunneling, the construction team used means such as cross-hole CT and ground-penetrating radar scanning to effectively identify possible adverse geology in the crossing section, including soil cavities, sand-gravel layers, and karst development, and strictly controlled tunneling parameters and muck discharge. Combined with HSP advanced geological prediction and ground-penetrating radar detection, the shield successfully passed through safely and smoothly.

As a key project of rail transit in the Guangdong-Hong Kong-Macao Greater Bay Area, Phase II of Shenzhen Metro Line 16 is a rail trunk line for realizing the southward expansion of Longgang Central City and Universiade New Town. Once completed, it will continuously optimize the "metro + high-speed rail" transportation network, accelerate the circulation and efficient allocation of resources in the Greater Bay Area, and promote the integrated high-quality development of the Greater Bay Area.