Article
Green & Sustainable Science & Technology
Mengyao Xie, Zongping Ren, Binxia Miao, Zhanbin Li, Xiaoni Ma, Rui Yan
Summary: This study examined the time-varying characteristics, differences in action period and spatial distribution, and temporal evolution of risk for the compound events of two erosion forces, precipitation and wind, in the Pisha sandstone area. The results showed that regional precipitation remained stationary, but wind exhibited changes in the five subseries divided by detected change points. Wind acted earlier than precipitation and increased from southeast to northwest, while precipitation did the opposite. Precipitation-led erosion has become the main erosion type in this area. These findings provide important insights for regional erosion studies and policy adjustments.
Article
Geosciences, Multidisciplinary
Pan Zhang, Peiqing Xiao, Wenyi Yao, Guobin Liu, Weiying Sun
Summary: This study analyzed the mechanisms of combined erosion and sediment yield in the Pisha sandstone region of the Ordos Plateau, finding that coarse sediment was first transported due to the special texture and terrain characteristics of Pisha sandstone soil. The study also revealed that the degree of heterogeneity of sediment under complex erosion was larger than that under water erosion.
Article
Crystallography
Yanxing Wang, Chi Li, Cuiyan Wang, Yu Gao
Summary: In this study, MICP technology was used to improve the anti-water scour and anti-sand erosion performance of weathered Pisha sandstone soil. The improved soil showed effective cementation, increased strength, and enhanced erosion resistance through the filler effect of induced calcium carbonate crystals.
Article
Engineering, Multidisciplinary
Jingliang Dong, Tingting Zhang, Yingcan Zhu, Liqing Zhang, Yalong Jiang, Junhua Zhu
Summary: This study utilized natural Pisha sandstone to produce a novel alkali-activated cement, investigating its rheological properties, compressive strength, hydration properties, etc. It was found that under certain conditions, AUPC could replace ordinary Portland cement, but high activator concentration or long curing time could increase porosity and lower compressive strength.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Peng Zhang, Long Li, Jing Wang, Shangxuan Zhang, Zhizhuo Zhu
Summary: The changes in slope erosion intensity and the spatial redistribution characteristics of soil aggregates and soil organic carbon (SOC) under water erosion conditions were analyzed using field runoff plots and three-dimensional laser scanning technology. The results showed that the slope erosion intensity decreased from the upper to the lower parts of the slope after rainfall. The SOC exhibited a loss state in the 0-2 cm soil layer and an enrichment state in the 2-4 cm soil layer. The correlation between SOC and soil aggregates varied with particle size, with a positive correlation with small aggregates and a negative correlation with large aggregates.
Article
Engineering, Geological
Qirui Ke, Changdong Li, Wenmin Yao, Yibo Fan, Hongbin Zhan, Bingchen Li, Xin Zhang
Summary: Due to seasonal variations in groundwater level and reservoir water level, the microstructure of sandstone undergoes changes during the cyclic wetting-drying process, with increasing microporosity and changes in grain, defect, and micropore structures. The pore compositions gradually shift into a bimodal distribution with dominating small-medium pores and large pores. Connected crack networks and fractures develop as the process continues. The correlation between microporosity values evaluated by different techniques is studied, and the evolution mechanisms of sandstone microstructures are discussed.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Environmental Sciences
Qian Sun, Heng Zhang, Long Huang, Caihong He
Summary: Soil erosion is a serious environmental problem globally. This article proposes an improved technique for monitoring surface deformation in a wind-water erosion crisscross region in the Loess Plateau, China. The results show that the surface deformation is highly correlated to precipitation and wind, and the proposed model is more suitable for analyzing the deformation in this region.
FRONTIERS IN ENVIRONMENTAL SCIENCE
(2022)
Article
Engineering, Geological
Chong Wang, Wansheng Pei, Mingyi Zhang, Yuanming Lai, Jinpeng Dai
Summary: The repeated wetting-drying (WD) cycles result in the widening of pores in sandstone, forming low-density areas and increasing density dispersion, weakening physical and mechanical properties. The P-wave velocity decreases faster than the S-wave velocity, especially in the first 5 cycles. Exponential equations are established to describe the deterioration of mechanical characteristics with the number of WD cycles.
ROCK MECHANICS AND ROCK ENGINEERING
(2021)
Article
Environmental Studies
Fabing Xie, Guangju Zhao, Xingmin Mu, Peng Tian, Peng Gao, Wenyi Sun
Summary: The study demonstrated the high soil erosion rate in the Pisha sandstone region of the Loess Plateau and employed UAVs and SfM technology for sediment yield measurement. Additionally, a modified SEDD model was utilized to identify erosion-prone areas in the watersheds.
Article
Engineering, Geological
Rui Li, Changtai Zhou, Yizi Fu, Jianbo Zhu
Summary: This study investigates the tensile properties and degradation mechanism of sandstone subjected to wetting-drying (W-D) cyclic treatment through mesostructure observation, mineral analysis, and static and dynamic tensile experiments. The results show that the tensile strength and dissipated energy of sandstone increase with increasing loading rate and decreasing cycles of W-D treatment. The degree of rock fragmentation is enhanced by increasing number of W-D treatment and loading rate. The fracture mode of sandstone changes from transgranular fracture to intergranular fracture with increasing cycles of W-D treatment.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Microbiology
Zhi-Yong Zhang, Fang-Fang Qiang, Guang-Quan Liu, Chang-Hai Liu, Ning Ai
Summary: Soil microorganisms play a crucial role in forest ecosystems, specifically in soil material cycles. This study used high-throughput sequencing technology to analyze the composition and diversity of bacterial and fungal communities in sea buckthorn forests in northern Shaanxi. The results showed that the dominant bacteria were Actinobacteria, Proteobacteria, and Acidobacteria, while the dominant fungi were Ascomycota. Soil and meteorological factors were identified as the main drivers of structural changes in the bacterial and fungal communities. The study provides valuable insights into the diversity of soil microbial communities and their interaction with environmental factors in water-wind erosion crisscross regions.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Forestry
Peng Chen, Jianying Guo, Tiegang Zhang, Zhi Dong, Hongli Li, Suqian Qiu, Xiaoxue Chen
Summary: Plant root systems play a crucial role in reducing erosion on slopes. Different vegetation patterns exhibit varying soil detachment rates, with shrubbery on the lower parts of slopes proving to be the most effective in combating erosion.
JOURNAL OF FORESTRY RESEARCH
(2022)
Article
Engineering, Geological
Xihui Jiang, Changdong Li, Jia-Qing Zhou, Zihan Zhang, Wenmin Yao, Wenqiang Chen, Hong-Bin Liu
Summary: This study investigates the impact of salt solution on the structure damage and permeability evolution of sandstone under wetting-drying cycles. The results show that the salt solution significantly affects the physical properties of the sandstone, causing surface peeling and internal cracking. The permeability of the sandstone decreases initially due to blocked seepage channels before gradually increasing and reaching a rapid growth after a certain number of cycles. The mechanisms of deterioration are linked to salt crystallization and pressure exerted on narrow pores. The findings contribute to a better understanding of salt-induced rock deterioration and its implications for rock engineering safety and geological hazard forecast.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
Yuxuan Chen, Guanglei Gao, Long Wang, Guodong Ding, Ying Zhang, Yang Zhao
Summary: This study determined the wind erodibility of different types of sand dunes in the Ulan Buh Desert and investigated its relationship with soil properties and wetting processes. The results showed that soil organic matter and calcium carbonate were positively correlated with wind erodibility, while coarse soil particles were negatively correlated with wind erodibility. Wetting processes had a significant impact on wind erodibility.
Article
Engineering, Geological
Hongru Li, Yafei Qiao, Manchao He, Rongxi Shen, Zhoujie Gu, Tai Cheng, Yingming Xiao, Jie Tang
Summary: Understanding the influence of water on the mechanical properties of rock materials is crucial for safe design and evaluation in rock engineering. This study investigated the effects of different wetting-drying cycles on sandstone's dynamic behavior, focusing on the changes in porosity, dynamic strength, and energy dissipation. The results showed that as the number of cycles increased, the porosity of the sandstone increased, while the dynamic strength and total energy dissipation decreased. Additionally, the impact of water saturation on dynamic strength changed from enhancement to weakening with increasing porosity.
ENGINEERING GEOLOGY
(2023)