Abstract
To address land resource scarcity in high-density urban environments, this study proposes a development technology system for ultra-deep underground space (-130 m) based on regular hexagonal honeycomb topology. Through collaborative design of a three-level road network architecture (main artery Φ30 m/secondary artery Φ25 m/branch road Φ12 m) and modular silos (85% prefabrication rate), combined with a layered reverse construction technique (sequential development of B1–B3 layers) and a "rigid waterproofing–drainage decompression–intelligent pressure relief" composite prevention and control system, efficient underground space development is achieved. The system innovatively employs dual-spiral road three-dimensional development (5% slope ratio), carbon fiber wound composite lining (compressive strength ≥200 MPa), and a geothermal temperature difference power generation system (energy self-sufficiency rate ≥65%), thereby significantly enhancing structural resilience (seismic resistance grade IX) and ecological benefits (55% carbon emission reduction). Engineering verification demonstrates that the system can reduce construction accident rates by 60% and shorten construction duration by 40%, providing a systematic solution for sustainable development of urban underground space.
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Preamble
Title: Cooperative Development and Application of Cellular Topology Hierarchy in Ultra-Deep Underground Space
Authors: Zhang Peng, Weng Yanren, Peng Binbin
Affiliation: Hunan Provincial Communications Planning, Survey and Design Institute Co., Ltd., Changsha 410200
Abstract
To address land resource scarcity in high-density urban environments, this paper proposes a technical framework for ultra-deep underground space development (-130 m) based on regular hexagonal cellular topology. Through integrated design of a three-tier roadway network (main arteries Φ30 m, secondary arteries Φ25 m, and branch roads Φ12 m) and modular silos (85% prefabrication rate), combined with hierarchical top-down construction methodology (sequential development of B1–B3 layers) and a composite control system integrating rigid waterproofing, pressure relief guidance, and intelligent pressure release, the system enables highly efficient underground space exploitation. Innovative features include dual-spiral three-dimensional roadway development (5% gradient), carbon fiber-wound composite linings (compressive strength ≥200 MPa), and a geothermal temperature-differential power generation system (energy self-sufficiency ≥65%), which collectively enhance structural resilience (seismic fortification intensity IX) and ecological benefits (55% carbon emission reduction). Engineering validation demonstrates that the system reduces construction accident rates by 60% and shortens project duration by 40%, offering a systematic solution for sustainable urban underground space development.
Keywords: Ultra-deep underground space; Cellular road network; Hierarchical top-down construction; Modular silos; Geothermal utilization; Resilient city