Experimental study on deformation and strength property of compacted loess

Mei, Yuan; Hu, Chen; Yuan, Ye; Wang, Xueyan; Zhao, Nan

doi:10.12989/gae.2016.11.1.161

Cited by 13 publications

(5 citation statements)

References 15 publications

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“…The strata within the burial depth range of 50.0 m at the proposed site are from top to bottom in the following order: Miscellaneous fill, loess, paleosols, old loess, and silty clay. Because the soil in Xi'an is mainly collapsible loess, the numerical simulation parameters in this article are based on the research parameters of the soil characteristics by relevant scholars (Mei et al, 2016;Mei et al, 2019).The underground utility tunnel structure adopted C40 concrete. The specific parameters of the numerical simulation are listed in Table 1.…”

Section: Input Parametersmentioning

confidence: 99%

Research on Safety Early Warning Standard of Large-Scale Underground Utility Tunnel in Ground Fissure Active Period

Wang

Zhang

2022

Front. Earth Sci.

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Safety control of large-scale underground utility tunnels is vital for engineering management units. The establishment of early warning indicator systems and standards is critical for safety control. However, there is limited related research for engineering construction, operation, and maintenance management. Numerical analysis results of the mechanical response of the underground utility tunnel of the Xi’an Xingfu LinDai project (the largest underground urban complex in Asia) at different intersection angles and ground fissure displacements were obtained. The vertical surface settlement, structural stress, fissure displacement, and contact pressure are proposed as early warning indicators of the structure of the underground utility tunnel during the active period of a ground fissure. The safety control values and early warning standards are given based on the analysis of the results. The safety warning indicator system and standards proposed in this article are concise, practical, and easy to implement. The data sample required by this warning indicator system is small and can be obtained using conventional monitoring sensors, which can be referenced for similar projects.

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Section: Input Parametersmentioning

confidence: 99%

Research on Safety Early Warning Standard of Large-Scale Underground Utility Tunnel in Ground Fissure Active Period

Wang

Zhang

2022

Front. Earth Sci.

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“…Many factors affect ground subsidence, including the construction of frozen holes, the removal of tunnel doors, and the tunneling of shields (Mei et al, 2016;Mei et al, 2019;Lai et al, 2020;;Wang et al, 2022b). In this study, the effects of shield tunneling on ground surface changes were mainly examined.…”

Section: Measured Analysis Of Surface Subsidencementioning

confidence: 99%

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

et al. 2022

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The initiation and reception of shields are major risk events for shield construction in water-rich and weak strata. Although the freezing method and the steel sleeve method receiving-shield tunneling technologies both have engineering applications, the environmental safety control effect cannot meet the construction requirements of water-rich soft soil. Considering the shield construction of a typical soft soil layer in Suzhou, China, as a research target, the applicability and safety of the freezing method combined with steel sleeve receiving-shield technology in water-rich soft soil were evaluated based on a field test system. The test results show that, during soil freezing, the temperature change trend of each measuring point in the temperature measuring hole is roughly the same. The freezing process can be divided into five typical stages. The closer the active freezing period of the water-rich soft soil is to the inside of the frozen-soil curtain, the faster the development rate of the frozen wall. The soil cooling gradient increased with an increase in the radial depth. After freezing the curtain circle, the soil frost heave significantly accelerated until the frost heave amount peaked. During the construction process, special attention should be paid to the change in the value of the soil settlement during each stage change to prevent sudden changes in soil displacement. The freezing method, combined with steel sleeve receiving-shield technology, can effectively reduce the environmental disturbance caused by shield construction in water-rich soft soil.

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“…In short, there are many successes in the repeated freezethaw tests of soil materials and the application of AGF in tunnel construction, but there are no reports on the application of AGF in the construction of saturated sandy stratum in collapsible loess areas [16,17]. e effect of the application of AGF in the sand layers of this region is not yet clear, particularly the temperature development of the frozen soil wall and the displacement of the frozen soil after excavation.…”

Section: Introductionmentioning

confidence: 99%

Field Test Study of the Artificial Ground‐Freezing Method Subsurface Excavation Construction of Watered Sandy Stratum in Collapsible Loess Area

Mei

Zhao

Wang

et al. 2020

Advances in Civil Engineering

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Saturated sandy stratum often makes tunnel excavation exceedingly difficult owing to its high water content. The artificial ground-freezing (AGF) method is an effective way to reduce the construction risks in such stratum; however, the AGF mechanism in the saturated sandy stratum of a collapsible loess area still lacks sufficient research. Based on field tests and numerical simulations, this study investigates the regularity of the temperature development, frost heave, and thaw subsidence distribution during the cross passage construction of a saturated sandy stratum in a collapsible loess area, using the AGF method. The results showed that the inward development rate of the frozen soil wall in the saturated sandy stratum was faster than its outward development rate. The gradient of the soil cooling curve was positively related to the longitudinal depth of the cross passage. The thickness of the frozen soil wall calculated by the slowest development rate of the frozen soil was conservative. The application of the pressure relief hole was beneficial to the release of the frost-heaving force and the control of the frost-heaving displacement. The pressure gauge pressure increase could be used as an identifier for the closure of a frozen soil wall. After excavation, the inner wall of the cross passage moved toward the inner space of the passage.

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Experimental study on deformation and strength property of compacted loess

Cited by 13 publications

References 15 publications

Research on Safety Early Warning Standard of Large-Scale Underground Utility Tunnel in Ground Fissure Active Period

Research on Safety Early Warning Standard of Large-Scale Underground Utility Tunnel in Ground Fissure Active Period

Water-Rich Soft Soil Freezing Method Combined With Steel Sleeve Receiving-Shield Technology Field Test Research

Field Test Study of the Artificial Ground‐Freezing Method Subsurface Excavation Construction of Watered Sandy Stratum in Collapsible Loess Area

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