Ranking of influence factors and control technologies for the post-construction settlement of loess high-filling embankments

Zhu, Caihui; Li, Ning

doi:10.1016/j.compgeo.2019.103320

Cited by 40 publications

(16 citation statements)

References 23 publications

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“…Yan' an New District, Shaanxi Province, China has started the largest loess filling project in the world. It is planned to cut mountains and fill gullies in about 90 km 2 within ten years 1 , 2 . At the same time, the number of airport construction projects in hilly and gully areas is increasing, and the record of high fill height is constantly refreshed.…”

Section: Introductionmentioning

confidence: 99%

“…By applying certain prestress, the advance reinforcement of the slope can be realized, and the sliding and deformation of the slope can be effectively constrained and controlled 13 , 14 . Although there are many research results in the displacement control and settlement prediction method of filling 2 , 4 , 6 , the displacement deformation characteristics and failure mechanism of the loess fill slope are not fully understood, and the displacement calculation method of loess fill slope supported by frame prestressed anchors remains to be further studied.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of horizontal displacement of loess fill slope supported by frame prestressed anchors based on minimum potential energy method

Zhao

Zhu

2022

Sci Rep

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Combined with the deformation characteristics of flexible retaining structure, the horizontal displacement calculation method of loess fill slope supported by frame prestressed anchors is proposed. Based on the minimum potential energy method, the analytical solution of horizontal displacement of slope under self-weight and additional load is derived, and the influence of soil parameters and supporting structure parameters on displacement is analyzed. The proposed calculation method is applied to a practical engineering and compared with the numerical simulation, which shows that the method is reasonable and reliable. The minimum potential energy method is clear in concept and simple in solving the horizontal displacement of loess fill slope supported by frame prestressed anchors. The calculation method proposed in this paper can be applied to the structural optimization design of loess fill slope supported by frame prestressed anchors, and further enrich the displacement calculation theory of slope supported by flexible retaining structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Calculation of horizontal displacement of loess fill slope supported by frame prestressed anchors based on minimum potential energy method

Zhao

Zhu

2022

Sci Rep

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“…Researches about the physical and mechanical properties of expansive soils under WD cycles are well documented, such as swelling-shrinkage characteristic, hydro-mechanical behavior, compressibility, and shear strength (Kampala et al 2014;Lin and Cerato 2015;Liu et al 2021a;Miao et al 2002;Wang and Wei 2014;Zhu and Li 2020). Among them, the shear strength has attracted much attention because of its critical role in slope stability evaluation and engineering Responsible Editor: Zeynal Abiddin Erguler design (Huang et al 2019;Liu et al 2021b;Wang et al 2019;Xu et al 2018;Yan et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Shear strength and damage characteristics of compacted expansive soil subjected to wet–dry cycles: a multi-scale study

Liu

Jing

2021

Arab J Geosci

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In expansive soil regions, engineering geological disasters frequently occur in wet-dry (WD) environments, which are inseparable from the degradation of soil shear strength and structural damage. This study attempts to assess the underlying mechanisms of shear strength degradation and micro-and mesoscale damage to expansive soil under WD cycles. Recompacted specimens were subjected to several WD cycles, then triaxial shear, nuclear magnetic resonance, and scanning electron microscopy tests were performed. Moreover, the influence of the WD cycles on the shear strength of expansive soil was evaluated. The state-of-the-art image processing and analysis techniques were combined to quantitatively investigate the evolution of the soil micro-and mesostructural characteristics. The results reveal that the deterioration of soil shear strength is primarily embodied in the initial 3 WD cycles, and is mainly due to the severe loss of cohesion (about 51.69%) during this period. Soil meso-cracks were formed under the combined effects of swelling potential and tensile stress, which mainly occurred in three stages: initiation stage (1-2 cycles); propagation stage (3-4 cycles); equilibrium stable stage (5-6 cycles). Indeed, the strength and average width of cracks were increased to varying degrees, which degraded the structural integrity of the soil. In addition, the microstructure of the soil was deeply affected by WD cycles; the total volume of pores increased significantly, the particles roundness decreased marginally, and an isotropic particles orientation was achieved as a whole with local preferential orientation (depolarization). The deterioration of shear strength of the expansive soil may be attributed to alterations in humidity, which causes the clay minerals in the soil to swell and shrink repeatedly, thereby yielding the irreversible fatigue damage of microstructure and propagation of meso-cracks. This work sheds light on the properties of shear strength evolution and mechanisms of structural damage in expansive soils in semi-arid regions.

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“…e total area of loess in China is about 640000 km 2 , accounting for 6.3% of the total land area, of which loess is the most widely distributed in Western China, accounting for 50%-60% of the total area in the western region. e creep behavior of loess is one of the most important problems to be studied [1][2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

Huang

Wang

et al. 2021

Advances in Civil Engineering

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When the traditional one-dimensional consolidator is used to study the creep characteristics of loess, due to the hoop effect of the ring cutter, only the attenuation creep stage and stable creep stage of loess can be studied, but the accelerated creep stage cannot be presented. In order to avoid the influence of drilling on the creep characteristics of loess, the paper improves the consolidation instrument by drilling holes along the diameter direction in the center of the sample to provide artificial space for soil failure. At the same time, the sample size is increased to ensure that the diameter of the sample is greater than five times of the diameter of the borehole, so as to avoid the influence of drilling on the creep characteristics of loess. The creep characteristics of loess are studied by step loading (vertical pressure at all levels is 125 kPa, 175 Pa, 225 kPa, and 275 kPa), and the whole creep process characteristic curves of loess under different stress conditions are obtained. An endoscope was placed in the hole to observe the deformation and failure characteristics of loess in different stages of creep. This method makes up for the defect that the traditional one-dimensional consolidator cannot obtain the whole process characteristics of loess creep. At the same time, it has the advantages of simple operation, less external influence factors, stronger data reliability, and can directly observe the changes of loess creep soil. It has a beneficial role in promoting the experimental research of loess creep characteristics.

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Ranking of influence factors and control technologies for the post-construction settlement of loess high-filling embankments

Cited by 40 publications

References 23 publications

Calculation of horizontal displacement of loess fill slope supported by frame prestressed anchors based on minimum potential energy method

Calculation of horizontal displacement of loess fill slope supported by frame prestressed anchors based on minimum potential energy method

Shear strength and damage characteristics of compacted expansive soil subjected to wet–dry cycles: a multi-scale study

A Test Method for Creep Characteristics of Loess Based on the One‐Dimensional Consolidator

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