Recently, rising demands for infrastructure and environmental remediation, along with dualcarbon targets, have driven the development and application of novel geomaterials in geotechnical engineering, including slope stabilization, tunnel support, road subgrade improvement, underground storage, and marine engineering. Simultaneously, the resource utilization of industrial waste and the management of hazardous geomaterials have emerged as important research directions for green engineering and sustainable development. Studies have shown that the performance of these advanced geomaterials depends not only on their physical and mechanical properties but is also influenced by chemical environments, freeze-thaw cycles, and hydrogeological conditions, making interdisciplinary coupling research an essential approach. Nevertheless, understanding of the behavior of newly developed geomaterials under complex environmental conditions remains limited, highlighting the need for comprehensive and systematic investigation.The Research Topic aims to compile the latest studies on novel synthetic materials, disaster soil reinforcement, and engineering safety under complex environmental conditions. A total of 19 papers are presented, encompassing theoretical analyses, laboratory experiments, numerical simulations, and field tests. Collectively, these works provide valuable insights for the design of low-carbon geotechnical infrastructure, the enhancement of engineering stability, and the promotion of environmentally sustainable practices.This section examines the improvement of problematic soils, including expansive soils and loess, and the resource utilization of industrial by-products (e.g., slag, fly ash, calcium carbide slag, and lithium slag), with a focus on microstructure, mechanical performance, and environmental ultra-high-strength geopolymer concrete using ground granulated blast furnace slag, fly ash, and silica fume. The optimal mix (GGBFS/FA = 4:1, 5% silica fume) achieved a compressive strength of 157.0 MPa, which was comparable to conventional ultra-high-performance concrete, offering a low-carbon route for high-performance building materials.This section highlights the effects of freeze-thaw cycles, seawater intrusion, temperature, and other environmental factors on the mechanical and physical properties of soils and slurries. Ru et al. Numerical simulations demonstrated significant improvements in ultimate bearing capacity, initial stiffness, and energy dissipation capacity, while shortening the construction period. This approach reduced on-site wet work and resource consumption, reflecting a low-carbon strengthening concept.
Bai et al. (Thu,) studied this question.