Evaluation of soil collapse potential in regional scale

Momeni, Mehdi; Shafiee, Ali; Heidari, Mojtaba; Jafari, Mohammad Kazem; Mahdavifar, M R

doi:10.1007/s11069-012-0252-z

Cited by 19 publications

(17 citation statements)

References 33 publications

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“…ere were six survey lines in total (Figure 3), and each survey line was 15 m in length (Table 1). A total of 28 deep markers were laid out in the 6 survey lines, and there were 5 deep markers for survey lines IV, V, VII and IX, while 4 e deep marker (Figure 4) consisted of several mechanically connected galvanized pipes and a 60 mm diameter iron base plate welded vertically. And the location of the subbase reflects the subsidence of the soil beneath it.…”

Section: Test Pit Design and Survey Point Layoutmentioning

confidence: 99%

“…When collapsible loess is wetted by water, the internal structure of the loess is destroyed under the joint action of self-weight stress or selfweight stress and external additional stress, and the strength of the loess decreases significantly [1][2][3]. When the remaining strength between loess units is insufficient to resist their stresses, the soil structure is rapidly disrupted, resulting in significant self-weight collapsible deformation of the soil [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

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Study on the Loess Immersion Test of Metro Line 2 in Xi’an, Shaanxi Province, China

Wang

et al. 2021

Advances in Civil Engineering

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With the implementation of China’s western development and “One Belt, One Road” initiative, there are more and more projects in the collapsibility loess area, and the collapsibility loess problem encountered in the construction is becoming more and more prominent. In this paper, the collapsibility loess of the south extension section of Xi’an Metro Line 2 is investigated, and its collapsibility characteristics are studied through a large-scale site immersion test. The test site was a 15 m diameter circular test pit, which took 35 days for water injection and 60 days for observation after water stopped. The test results showed that the maximum self-weight collapsibility of the soil layer in the test pit is 32 mm, and the deformation amount is 10.05 mm in Q3 and 9.55 mm in Q2. The maximum deformation amount of 32 mm is less than 70 mm in the shallow marker; it may be caused by the paleosol layer as a bridge to provide a support to the overlying soil layer. The shape of the sphere of influence after immersion resembles a trumpet, slightly protruding outwards from the paleosol. The scope of influence between the infiltrated and saturated zones gradually increases with depth, and the saturated zone is generally smaller than the infiltrated zone. The research results of this paper can provide technical support and reference for the construction of Xi’an Metro Line 2 and other related projects in the region.

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Section: Test Pit Design and Survey Point Layoutmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the Loess Immersion Test of Metro Line 2 in Xi’an, Shaanxi Province, China

Wang

et al. 2021

Advances in Civil Engineering

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“…Loess deposits cover 640000 km 2 , distributed mainly along the middle reaches of the Yellow River Valley, constituting one of the most important parts of the Chinese regional and physical geography and the Loess Plateau. Because of its collapse behavior and other associated geotechnical engineering issues, such as landslides, hydro-consolidation, and wetting-induced collapse, loess belongs to problematic soils and has been the subject of geotechnical research and practice since the 1960s [4][5][6][7][8][9][10][11][12][13][14]. Following the adoption of "the belt and road" strategy, infrastructure construction in the Loess Plateau will develop more vigorously.…”

Section: Introductionmentioning

confidence: 99%

Collapse Potential of Loess under Unloading Effect

Jin

Wang

Zhao

et al. 2021

Advances in Civil Engineering

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Collapsible loess is generally characterized by a sudden and substantial decrease in volume that occurs when is applied under constant stress. To evaluate the loess collapse potential, the self-weight collapse and collapse coefficients have been defined by the code for building construction in collapsible loess regions. However, the method in the code does not account for the vertical stress variation. The loess collapse process commonly occurs with stress variation in practice. This paper documents a low-cost, quantitative evaluation scheme using regression analysis to evaluate the loess collapse potential by varying the unloading levels. The results show that the factors that prominently account for loess collapse deformation are the initial pressure, unloading ratio, and collapse completed-ratio. At a constant collapse-completed ratio, the remnant collapse coefficient significantly decreases with the decreasing unloading ratio; at a constant unloading ratio, the remnant collapse coefficient increases with a decreasing collapse-completed ratio. Decreasing unloading and collapse-completed ratios decreased the loess collapse potential with an initial pressure that exceeds the threshold value. Finally, an unloading collapse deformation calculation of loess was prepared to analyze practical project problems of loess based on the unloading collapse test.

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“…Loess is the dominant soil in Northwest China, accounting for 72.4% of the total loess area in China. In addition, China introduced the conception of the "New Silk Road Economic Belt" in 2013, and most of the soil in this area is loess, which brings great opportunity and challenge to the construction of pile foundation in loess area [16][17][18][19][20][21]. When cast-in-place bored piles are used in loess area, the steel casing is usually used to stabilize the borehole wall or solve the slurry leakage problem of huge caves.…”

Section: Introductionmentioning

confidence: 99%

Effect of Steel Casing on Vertical Bearing Characteristics of Steel Tube-Reinforced Concrete Piles in Loess Area

Feng

Dong

et al. 2019

Applied Sciences

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This study aims at investigating the effect of steel casing on vertical bearing characteristics of steel tube-reinforced concrete piles in loess area by centrifugal model test. Five piles were selected, one of them was a conventional reinforced concrete pile which was 35 cm in length and 2.5 cm in diameter as a contrast pile, and the length of steel casing for the remaining four steel tube-reinforced concrete piles was 8 cm, 12 cm, 16 cm, and 20 cm respectively. The results show that the axial force, unit skin friction, tip resistance, and shaft resistance of steel tube-reinforced concrete piles with different steel casing lengths were different from conventional reinforced concrete pile. Additionally, the ultimate bearing capacity of steel tube-reinforced concrete piles was compared with a conventional reinforced concrete pile. Moreover, advantages of steel casing in pile foundation engineering were summarized. The results of this study can provide reference for vertical bearing characteristics of steel tube-reinforced concrete piles in loess area.

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Evaluation of soil collapse potential in regional scale

Cited by 19 publications

References 33 publications

Study on the Loess Immersion Test of Metro Line 2 in Xi’an, Shaanxi Province, China

Study on the Loess Immersion Test of Metro Line 2 in Xi’an, Shaanxi Province, China

Collapse Potential of Loess under Unloading Effect

Effect of Steel Casing on Vertical Bearing Characteristics of Steel Tube-Reinforced Concrete Piles in Loess Area

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