Elimination of loess collapsibility with application to construction and demolition waste during dynamic compaction

Feng, Shi-Jin; Shi, Zhenming; Shen, Yang; Li, Liu-Chi

doi:10.1007/s12665-014-3783-7

Cited by 22 publications

(10 citation statements)

References 24 publications

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“…To date, more than a hundred billion tons of CDW were generated in the world, while approximately 30% to 50% of them were waste concrete [2]. However, this considerable amount of waste concrete is mainly disposed of in landfills, resulting in a severe environmental problem [3][4][5][6]. In order to protect the ecological environment and achieve sustainable development, reducing, reusing, and recycling construction waste is a desirable approach to preserve the ecological environment [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

et al. 2019

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This paper aims to manufacture recycled concrete hollow block (RCHB) which can be used for the masonry structure with seismic requirements. Five RCHB masonry walls were tested under cyclic loading to evaluate the effect of the axial compression stress, aspect ratio, and the materials of structural columns on the seismic performance. Based on the test results, the failure pattern, hysteresis curves, lateral drift, ductility, stiffness degradation, and the energy dissipation of the specimens were analyzed in detail. The results showed that with the increase of aspect ratios, the ductility of RCHB masonry walls increased, but the horizontal bearing capacity and energy dissipation of RCHB masonry walls decreased. With the increase of compressive stress, the bearing capacity and energy dissipation performance of RCHB masonry walls were improved, and the stiffness degraded slowly. The results also demonstrated that the RCHB masonry walls with structural columns, depending on whether the structural columns were prepared by ordinary concrete or recycled concrete, could increase the bearing capacity, ductility, and energy dissipation of specimens. The research confirmed that RCHB masonry walls could meet the seismic requirements through thoughtful design. Therefore, this study provided a new cleaner production for the utilization of construction waste resources.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

et al. 2019

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“…Downhole dynamic compaction (DDC) has been used to stabilize collapsible soil (i.e. loess) in China (Feng et al, 2015). The DDC pile can be constructed using the pre-boring method which involves pre-boring a hole before filling it with DDC materials or through self-tamping method which focuses on dropping a hammer (in Figure 1) on the pile location until the hole reaches the desired depth as illustrated in Figure 2.…”

Section: Introductionmentioning

confidence: 99%

“…The DDC pile can be constructed using the pre-boring method which involves pre-boring a hole before filling it with DDC materials or through self-tamping method which focuses on dropping a hammer (in Figure 1) on the pile location until the hole reaches the desired depth as illustrated in Figure 2. This selftamping method is commonly used due to its ability to cause dynamic lateral stress which densifies the surrounding soil, especially when the soil is loess collapsible soil (Feng et al, 2015). Meanwhile, the pre-boring method is mostly used when the self-tamping method is not usable (usually due to a very hard soil layer).…”

Section: Introductionmentioning

confidence: 99%

The Determination of Downhole Dynamic Compaction Paramaters Based on Finite Element Analysis

Wijaya

Arsyad

Lim

et al. 2022

jcef

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Downhole dynamic compaction (DDC) has been commonly used in China to stabilize collapsible soil through the application of construction and demolition waste material (CDW). DDC basically forms a column inside the soil stratum which is similar to a stone column except DDC materials are put in sequence and then compacted by using DDC hammer. Due to its attractive features such as its big diameter, feasibility of using oversized material particles, rapid and simple construction technique, it is used as one of the ground improvement methods for an airport project in Indonesia. Despite of all the advantages provided by DDC, it is difficult to obtain DDC parameters from laboratory tests as it is difficult to replicate the compaction effort induced by the DDC hammer and laboratory tests are not commonly employed for oversized materials. Hence, alternative method is required to evaluate DDC parameters. In this study, static load test is conducted to determine load-deformation curve of the DDC pile. Soil parameters are first determined through soil test data such as standard penetration test (SPT), laboratory test and also pressure meter tests. Correlation between pressure meter tests and SPT test result is also carried in order to interpret the soil parameter at the site. Axisymmetric finite element analysis is then carried by using MIDAS GTS NX in order to back analyses DDC parameters by matching the simulation curve with load settlement curve of the DDC. In this paper, it is shown that back analysis using hardening soil model for DDC material can be used to match simulation curve with the load-deformation curve.

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“…At present, there are two methods to study loess collapsibility: one is the combination of indoor test and mathematical method, and the other is the field water immersion test. e former is mainly to study the mechanism and mathematical model of loess subsidence [7][8][9][10][11], while the latter can intuitively get the test site after immersion subsidence development process and water migration process in space [12][13][14][15][16][17], and then the site of the subsidence level to make evaluation [18][19][20][21][22][23], and this method is more recognized by the engineering practice. Xing and Liu [24] analyzed the influencing factors of negative skin friction for pile foundations in collapsible loess regions through water immersion tests, and the main factors are cumulative relative collapse amount, pile type, and change in loess collapsibility.…”

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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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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Elimination of loess collapsibility with application to construction and demolition waste during dynamic compaction

Cited by 22 publications

References 24 publications

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

Experimental Study on the Seismic Performance of Recycled Concrete Hollow Block Masonry Walls

The Determination of Downhole Dynamic Compaction Paramaters Based on Finite Element Analysis

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

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