Xiaoxiao Luo

• South China University of Technology

The piston wind induced by a high-speed train passing through tunnel accelerates the heat transfer between air inside and outside tunnel in cold regions, thereby exacerbating tunnel frost damage. It is importance for enhancing the anti-freezing capability to study the temperature distribution of a tunnel in cold regions under the influence of pisto...

As the heat exchange interface between atmosphere and permafrost, land cover regulates the influence of climate warming on permafrost. With the development of desertification on the Qinghai-Tibetan Plateau (QTP), aeolian sand has emerged as a significant environmental factor influencing the hydrothermal process of permafrost. To reveal the hydro-th...

Heat exchange between the oil pipeline and the permafrost leads to the geotemperature redistribution and permafrost degradation, threatening the pipeline stability. The water redistribution during freeze–thaw cycles affects the physical and mechanical properties of soil and induces heat convection. However, the hydro-thermal process of unsaturated...

Expressways construction in warm permafrost regions is faced with serious permafrost degradation, and expressways stability is closely related to its thermal-hydro-mechanical state. However, the behaviors of moisture, heat and deformation of expressway in warm permafrost regions are not completely clear. In this study, the experimental embankment f...

Desertification is a process of land degradation embodied in soil water reduction, soil deterioration and vegetation degradation. As an important factor to evaluate the desertification degree, the water content of shallow soil will infiltrate downward when permafrost degrades on the Qinghai-Tibet Plateau (QTP). With the development of transportatio...

As an efficient and economical engineering measure, the inverted T-shaped crushed-rock interlayer is used to protect the permafrost under expressway. Its cooling performance is threatened by the climate warming, strong heat absorption of asphalt pavement and aeolian sand on the Qinghai-Tibet Plateau. However, the influence effect of the aeolian san...

The instability of the shallow tunnel with asymmetric loess cover affected by the earthquake has been one of the most prominent geotechnical disasters in the loess region. Under the shallow-focus earthquake, the tunnel is subjected to obliquely incident seismic waves, and its seismic response is significantly affected by the non-uniform ground moti...

As an efficient engineering measure for protecting permafrost from thawing, the composite measure composed of L-shaped two-phase closed thermosyphons (TPCTs), insulation board and crushed-rock revetments (CRs) is applied to the low-grade highway in the Qinghai-Tibet Plateau. However, it is uncertain whether this composite measure can be available f...

The shallow bias section at the tunnel portal is one of the most seriously damaged areas under earthquake conditions. The seismic responses of the loess slope and the tunnel structure interact in a bias tunnel-loess slope coupling system. In this study, a 1:25 large-scale shaking table model test on the bias loess tunnel is conducted, and the seism...

Embankment with duct-ventilated slope (EDVS) is a new kind of proactive roadbed cooling measure in permafrost regions, which is composed of multiple hollow cement ventilation ducts assembled side by side, and the ducts are laid down on embankment slope. To investigate its cooling mechanism and performance, a prototype field test was carried out on...

The embankment construction in permafrost regions changes the energy balance on the surface, resulting in the degradation of the underlying permafrost and instability in the embankment structure. Considering the strict evenness requirement for an expressway, large deformation and instability in expressway embankment cannot be allowed. Accordingly,...

Artificial freezing ground method is widely applied in adverse geotechnical engineering conditions to improve the strength and reduce permeability of soil. It is a challenge to ascertain the progression of frozen wall and analyze the arrangement of freezing pipes due to the complexity of freezing process involving ice-water phase change and water m...

In permafrost regions, the construction of embankment leads to the permafrost degradation, further affecting the embankment stability. Considering wider bituminous pavement and higher technical standard for expressway than ordinary highway, the heat and deformation behaviors of the separated expressway are investigated through a full-scale field ex...

Frost heave is the prevailing damage to the embankment in cold regions. It is a challenge to ascertain frost damage behavior of the embankment due to the complication of freezing-thawing process involving water migration, heat convection process of water, ice-water phase transition, and frost heave. To investigate the freezing behavior of the emban...

As an effective engineering measure, thermal insulation layer is used to prevent tunnel from frost heave damage in seasonally frozen regions. Two different methods are generally adopted to lay insulation layer. One is to lay the insulation layer between the preliminary lining and the secondary lining. The other is to lay the insulation layer on the...