Subsidence monitoring and influencing factor analysis of mountain excavation and valley infilling on the Chinese Loess Plateau: A case study of Yan'an New District

Zhang, Hongxue; Zeng, Runqiang; Zhang, Yi; Zhao, Shufen; Meng, Xingmin; Li, Yuanxi; Liu, Wangcai; Meng, Xiaoxue; Yang, Yunpeng

doi:10.1016/j.enggeo.2021.106482

Cited by 34 publications

(9 citation statements)

References 30 publications

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“…Plain soils (0.5-1 m thick) and fractured rocks (0.8-1.2 m) are used as the upper and lower cushions, respectively, to support the platform and keep it suitably above the water table. The remolded specimens being compacted have less connected pores than the intact specimens (Zhang, Zhu, et al, 2020), and their soil-water retention conditions are similar (Hou et al, 2020). For targets P1 and P2 in close distance at the center of the fastest subsiding area, their multiannual speed variations differ during 2016 and 2017 (Figure 3), likely due to different operations of dynamic compaction.…”

Section: Spatiotemporal Displacementsmentioning

confidence: 99%

“…This represents one of the biggest engineering challenges in the MECC project. The microstructure of loess-like soil governs its creeping behavior (Xie et al, 2018), and the reduced pore microstructure is usually more stable, which renders a practical engineering solution via dynamic compaction, a.k.a., heavy tamping (Zhang, Zhu, et al, 2020). The dynamic compaction is performed in a progressive way, including constructing 4.5-m-depth water drainage ditch.…”

Section: Spatiotemporal Displacementsmentioning

confidence: 99%

“…SAR remote sensing has manifested its versatility in characterizing the ground deformation in various landscapes at different spatiotemporal scales such as on critical infrastructures, coastal and inland urban regions, archeological sites, landslides, permafrost, glaciers, earthquakes, and volcanoes (e.g., Biggs & Wright, 2020;Chen, Guo, et al, 2017;Chen, Wu, et al, 2017;Handwerger et al, 2019;Lu & Dzurisin, 2014;Schaefer et al, 2019;Shirzaei et al, 2020;Xu et al, 2020). InSAR studies over Yan'an is not new (e.g., Wu et al, 2019;Zhang, Zhu, et al, 2020;Xu et al, 2021); however, the attendant ground deformation and subsurface stress distribution have not been quantitatively investigated and verified. Here, we first introduce the geological and hazardous environment of Yan'an in the Loess Plateau of China (Section 2).…”

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confidence: 99%

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Remote Sensing Characterization of Mountain Excavation and City Construction in Loess Plateau

Xue

Yang³

et al. 2021

Geophysical Research Letters

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The population growth and urban expansion aggravate the tension between human and ecological environment, especially for the naturally fragile environments. The Loess Plateau in the vast mid-north China, including Shaanxi, Gansu, and Sichuan Provinces, covers an area of 624,641 km 2 (Wang, 2017). The loess is composed of million-year-old thick deposits of windblown dust and silt, which are subject to disaggregation under harsh climatic and soil conditions. The natural and anthropogenic deforestation has accelerated the erosion, leading to various geological hazards such as droughts and floods, monsoonal summertime landslides, and springtime sandstorms.Although the early civilizations heavily relied on agriculture benefiting from fertile soils, the intensive soil erosion and channel incision have transformed 70% of the original flat plateau into the hilly gully landscape over thousands of years (Fu et al., 2017). Local farmers were in poverty as their efforts can hardly be paid off due to inappropriate soil conditions and multihazard scenarios. To mitigate soil erosion and desertification, as well as to restore the forest landscape for a sustainable development in northern China, the government dedicated to the Grain for Green Program (a.k.a., Conversion of Cropland to Forest Program) during 1999-2008, along with several nationwide campaigns launched in late 1990s, such as the Natural Forest Protection Program and the Sloping Land Conversion Program

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Section: Spatiotemporal Displacementsmentioning

confidence: 99%

Section: Spatiotemporal Displacementsmentioning

confidence: 99%

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confidence: 99%

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Remote Sensing Characterization of Mountain Excavation and City Construction in Loess Plateau

Xue

Yang³

et al. 2021

Geophysical Research Letters

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“…However, the use of loose and low-bearing-capacity high-filled soil can potentially jeopardize the stability and safety of a building's foundation [4,5]. The primary cause of this issue is the utilization of non-engineered fillings, such as excavated soils in construction areas (e.g., tunneling works, road construction cuts and hill cuts), which are typically employed for cost efficiency and environmental protection reasons [6][7][8]. The original composition, microstructure and interparticle bonds of non-engineered filling are destroyed and regrouped during man-made excavation and backfilling [9].…”

Section: Introductionmentioning

confidence: 99%

“…Although several studies have investigated the effectiveness of the DC method in reinforcing various soil layers such as sand [23,30], loess [2,7,19] and dredged soil [31,32], the efficacy and optimal design parameters of this method for red soil with weaker engineering properties remain unclear. Yuan et al (2018) conducted model tests to investigate the reinforcing effect of the DC method on red clay treatment [33].…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive In Situ Investigation on the Reinforcement of High-Filled Red Soil Using the Dynamic Compaction Method

Wang

Yonghui

et al. 2023

Sustainability

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High-filled red soil typically lacks sufficient bearing capacity, which can pose significant challenges when constructing building foundations. One economical and effective method for the reinforcement of high-filled red soil is the dynamic compaction (DC) method. However, the design parameters for reinforcing high-filled red soil using the DC method are largely based on experience, which indicates the significant value of field results of related engineering practice. In this paper, we report a field study that was carried out to investigate the effect of impact energy on the treatment of super-high-filled ground with red soil in southwestern Yunnan, China, where three pilot DC tests were designed and conducted with three different impact energies (4000 kN·m, 8000 kN·m and 15,000 kN·m). To evaluate the reinforcement effect and optimize the DC operational parameters, a series of in situ tests, including settlement monitoring, standard penetration tests, dynamic penetration tests, surface wave velocity tests and plate-load tests, were carried out. Furthermore, the improvement depth of DC was discussed. The results of the field study show that the characteristic value of the ground bearing capacity of the three test zones could reach 250 kPa, which coincides with the design requirement, although the improvement depth of testing zone III fails to reach the required depth. This study helps to improve the in situ recycling of high-filled soil, thereby promoting the sustainable development of engineering construction.

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Field practice and ground settlement behaviors of a land creation case in loess area of China

Yonghui

Shui²,

2022

Bull Eng Geol Environ

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Subsidence monitoring and influencing factor analysis of mountain excavation and valley infilling on the Chinese Loess Plateau: A case study of Yan'an New District

Cited by 34 publications

References 30 publications

Remote Sensing Characterization of Mountain Excavation and City Construction in Loess Plateau

Remote Sensing Characterization of Mountain Excavation and City Construction in Loess Plateau

A Comprehensive In Situ Investigation on the Reinforcement of High-Filled Red Soil Using the Dynamic Compaction Method

Field practice and ground settlement behaviors of a land creation case in loess area of China

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