Related references
Note: Only part of the references are listed.
Review
Engineering, Civil
Shuoshuo Xu et al.
Summary: The study of soil cracking is of increasing importance due to climate change and frequent natural disasters, posing a significant threat to infrastructure. Researchers have used various methods to tackle the issue, exploring factors such as soil thickness, temperature, and wet-dry cycles that contribute to the complex desiccation cracking process. The research has involved theoretical studies, indoor experiments, numerical simulations, and advanced techniques like X-ray CT and image processing. This paper provides a brief review and summary of the research on soil cracking, including mechanisms, influencing factors, and a comparison of research methods, while also identifying current limitations and future research directions.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2023)
Article
Engineering, Geological
XiaoLin Weng et al.
Summary: Undrained torsional shear tests were conducted on remolded loess specimens to examine the deformation behavior and noncoaxiality of remodeled loess under simultaneous changes in magnitude and direction of the principal stress. The results showed that the deformation behavior of the tested samples was significantly influenced by the intermediate principal stress coefficient and the rotation range of the principal stress. Furthermore, the effects of elastic strain, rotation range of principal stress, intermediate principal stress coefficient, and cycle period on the noncoaxiality were investigated. The analysis of the test results revealed obvious noncoaxiality of the remolded loess, which exhibited segmentation characteristics. Considering elastic strain led to an overestimation of noncoaxiality, and noncoaxiality became negative when the principal stress rotated in the reverse direction.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Construction & Building Technology
Yiwen Qin et al.
Summary: The airtightness detection of waterproofing sheets is crucial for the success of tunnel waterproofing work. The main causes of air leakage in the sheets include unqualified lap welded seams and welded scars after repair welding. The existing test standards for welded seams in tunnel waterproofing technology have been established, but quantitative test standards for welded scars are lacking. Through model experiments and numerical simulations, the relationship between pressure loss during negative pressure testing and various factors was studied, and a quantitative standard for the airtightness of welded scars was proposed. Field tests confirmed that the proposed standard is accurate and traceable, and it significantly improves project management compared to qualitative detection methods.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
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Engineering, Geological
Shuoshuo Xu et al.
Summary: This study uses X-ray computed tomography to monitor the internal deformation and strain fields of drying kaolinite samples, revealing the impact of shrinkage and desiccation cracking on their mechanical and hydraulic properties.
Article
Engineering, Geological
Haobo Fan et al.
Summary: When constructing a tunnel in a weak loess stratum (Q(3) loess or Q(4) loess), the poor geological characteristics of loess often bring great difficulties and potential risks. However, the use of jet-grouting piles can effectively reinforce the tunnel foundation and reduce subsidence at the tunnel bottom. The length of the jet-grouting pile is more important than the diameter in improving the strength of the foundation, but it may lead to increased surrounding rock pressure and lining stress, reducing construction economy and structural safety.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2023)
Article
Engineering, Mechanical
Wenbo Zan et al.
Summary: This study investigates the extreme deformation and collapse induced by tunnelling in weathered phyllite strata, focusing on the characteristics, failure factors, mechanism, and countermeasures. In-situ monitoring results indicate significant variations in vault subsidence and peripheral convergence, with different modes of damage observed in the support structures. Laboratory tests reveal that the decrease in density and strength, increase in water content, water absorption, porosity, fragmented microstructure, and presence of secondary micropores and microcracks contribute to the failure. Proposed countermeasures, including variable-stiffness support, have been proven effective in controlling rock deformation through engineering application.
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(2023)
Article
Construction & Building Technology
Yiwen Qin et al.
Summary: This study focuses on the instability and failure evolution process of unlined tunnels in boulder-cobble mixed (BCM) formations found in river terraces. Through a physical model test, the research investigates the variation laws of surrounding rock stress and displacement under excavation and rainfall conditions. The findings reveal a staged deformation process with the formation of pressure arches and expansion of the loose zone in the tunnel vault area. The strategies for preventing and controlling collapse are summarized based on the instability evolution characteristics of the surrounding rock.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Construction & Building Technology
Zhichao Wang et al.
Summary: Failure and over-deformation of tunnel supports in loess areas are common issues. Steel-concrete composite support (SCCS) is a new and innovative support system that offers an effective solution. This study investigates the mechanical behavior of p-type SCCS arch under different pressure conditions and identifies three stages of failure. The experiment also reveals that the deformation and failure modes vary under different surrounding pressures.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Environmental Sciences
Junling Qiu et al.
Summary: The study found that loess metro tunnels form collapsible cavities under local water immersion, affecting the internal forces and deformations of the tunnel structure. These effects are related to the distance from the collapse center and can be divided into strong, weak, and no influence zones. The numerical simulation results are slightly smaller than theoretical calculations due to simplification of the leakage water source, but the trend remains consistent.
ENVIRONMENTAL EARTH SCIENCES
(2022)
Article
Construction & Building Technology
Zhiguo Zhang et al.
Summary: The paper proposes a time-dependent complex variable approach to estimate the deformation and stress of surrounding soils caused by tunnelling considering the rainfall infiltration mechanisms. It is verified that the presented solution can accurately predict surface settlement, soil subsidence and horizontal displacement. The parameters affecting ground deformation and stress induced by tunneling in rainy days are also studied.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Yiwen Qin et al.
Summary: In this study, the failure problems encountered in tunnels constructed by shallow tunneling method in loose granular strata were successfully addressed using a tunnel construction project on the Sichuan-Tibet 318 Highway Line in China as an example. The failure phenomena, characteristics, and modes were systematically analyzed, and corresponding construction countermeasures were proposed. The results showed that the proposed countermeasures had a remarkable effect, providing valuable references for tunnel design, construction, and disaster control in similar areas.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Engineering, Civil
Qian Fang et al.
Summary: This study investigates the effects of new tunnelling on existing tunnels using a centrifuge model test. The results show that the soil pressures and bending movements of the existing tunnels behave differently due to the new tunnel excavation. The joint deformation of the existing tunnels can be classified into translation, rotation, or a combination of both.
Article
Engineering, Civil
Qian Fang et al.
Summary: The study used centrifuge model tests to investigate the effects of new tunneling on existing tunnels, including surface settlements, soil pressures, bending movements, and joint behaviors. The results showed that the volume loss from new tunnel excavation was smaller than the soil volume moving into the tunnel, and the maximum settlement of the segmental lining model was larger than that of the composite lining model. Additionally, the soil pressures on different positions of the existing tunnel behaved differently, and the bending movements of the existing tunnels decreased due to new tunnel excavation.
Article
Geosciences, Multidisciplinary
Li Feng et al.
Summary: Original vertical joints (OVJs) have been considered a non-tectonic source of erosion and landform fragmentation in loess regions, but the current literature lacks a systematic overview of their origin. By reviewing key factors governing the formation and evolution of OVJs, a conceptual framework and case study demonstrate their genesis and dynamics. This new perspective enhances theoretical understanding of anisotropy formation and structural evolution in loess, aiding in modeling subsurface hydrology and geohazard risks in these regions.
EARTH-SCIENCE REVIEWS
(2021)
Article
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Linxin Zhang et al.
Summary: This study investigated the physical properties of natural loess and compacted loess from the Loess Plateau, finding significant differences in liquid limit, plastic limit, plasticity index, clay fraction, silt fraction, sand fraction, and compression modulus between the two types of loess. Compacted loess deforms more easily compared to natural sedimentary loess and the difference in compression modulus is mainly controlled by dry density and particle composition. The heterogeneity level of compacted loess is greater in the horizontal direction and smaller in the vertical direction compared to natural loess.
ENVIRONMENTAL EARTH SCIENCES
(2021)
Article
Construction & Building Technology
Shuai Shao et al.
Summary: This study analyzed the predisposing factors, common types of failures, and formation mechanisms of damage to the surrounding rock and supporting structure in large-span loess tunnels. An improved constitutive model considering the loess structural property was established and applied in numerical calculations to reveal the formation mechanism of different failures during loess tunnel construction.
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