Exploring efficiency of biochar in enhancing water retention in soils with varying grain size distributions using ANN technique     

Garg  Ankit  Wani  Insha  Zhu  Honghu  Kushvaha  Vinod 《Acta Geotechnica》2022,17(4):1315-1326

Acta Geotechnica - Recently, incentives have been provided in many countries, including Canada and Denmark, to produce biochar for construction usage. This is done because biochar is carbon...  相似文献   

Predicting tunnel squeezing using support vector machine optimized by whale optimization algorithm     

Zhou  Jian  Zhu  Shuangli  Qiu  Yingui  Armaghani  Danial Jahed  Zhou  Annan  Yong  Weixun 《Acta Geotechnica》2022,17(4):1343-1366

Acta Geotechnica - The squeezing behavior of surrounding rock can be described as the time-dependent large deformation during tunnel excavation, which appears in special geological conditions, such...  相似文献   

A unified constitutive model for cemented/non-cemented soils under monotonic and cyclic loading     

Lu  Yong  Zhu  Wen-xuan  Ye  Guan-lin  Zhang  Feng 《Acta Geotechnica》2022,17(6):2173-2191

Acta Geotechnica - In this paper, an elastoplastic constitutive model is proposed to uniformly describe the mechanical behavior of cemented/ non-cemented soil under different loading conditions. A...  相似文献   

Evolution of the freeze-thaw cycles in the source region of the Yellow River under the influence of climate change and its hydrological effects          下载免费PDF全文

Liang Zhu  Ming-nan Yang  Jing-tao Liu  Yu-xi Zhang  Xi Chen  Bing Zhou 《地下水科学与工程》2022,10(4):322-334

As an important water source and ecological barrier in the Yellow River Basin, the source region of the Yellow River (above the Huangheyan Hydrologic Station) presents a remarkable permafrost degradation trend due to climate change. Therefore, scientific understanding the effects of permafrost degradation on runoff variations is of great significance for the water resource and ecological protection in the Yellow River Basin. In this paper, we studied the mechanism and extent of the effect of degrading permafrost on surface flow in the source region of the Yellow River based on the monitoring data of temperature and moisture content of permafrost in 2013–2019 and the runoff data in 1960–2019. The following results have been found. From 2013 to 2019, the geotemperature of the monitoring sections at depths of 0–2.4 m increased by 0.16°C/a on average. With an increase in the thawing depth of the permafrost, the underground water storage space also increased, and the depth of water level above the frozen layer at the monitoring points decreased from above 1.2 m to 1.2–2 m. 64.7% of the average multiyear groundwater was recharged by runoff, in which meltwater from the permafrost accounted for 10.3%. Compared to 1960-1965, the runoff depth in the surface thawing period (from May to October) and the freezing period (from November to April) decreased by 1.5 mm and 1.2 mm, respectively during 1992–1997, accounting for 4.2% and 3.4% of the average annual runoff depth, respectively. Most specifically, the decrease in the runoff depth was primarily reflected in the decreased runoff from August to December. The permafrost degradation affects the runoff within a year by changing the runoff generation, concentration characteristics and the melt water quantity from permafrost, decreasing the runoff at the later stage of the permafrost thawing. However, the permafrost degradation has limited impacts on annual runoff and does not dominate the runoff changes in the source region of the Yellow River in the longterm.  相似文献   

Tectonic evolution and geodynamics of the Neo-Tethys Ocean     

Rixiang ZHU  Pan ZHAO  Liang ZHAO 《中国科学:地球科学(英文版)》2022,65(1):1-24

The Neo-Tethys Ocean was an eastward-gaping triangular oceanic embayment between Laurasia to the north and Gondwana to the south.The Neo-Tethys Ocean was initiated from the Early Permian with mircoblocks rifted from the northern margin of Gondwana.As the microblocks drifted northwards,the Neo-Tethys Ocean was expanded.Most of these microblocks collided with the Eurasia continent in the Late Triassic,leading to the final closure of the Paleo-Tethys Ocean,followed by oceanic subduction of the Neo-Tethys oceanic slab beneath the newly formed southern margin of the Eurasia continent.As the splitting of Gondwana continued,African-Arabian,Indian and Australian continents were separated from Gondwana and moved northwards at different rates.Collision of these blocks with the Eurasia continent occurred at different time during the Cenozoic,resulting in the closure of the Neo-Tethys Ocean and building of the most significant Alps-Zagros-Himalaya orogenic belt on Earth.The tectonic evolution of the Neo-Tethys Ocean shows different characteristics from west to east:Multi-oceanic basins expansion,bidirectional subduction and microblocks collision dominate in the Mediterranean region;northward oceanic subduction and diachronous continental collision along the Zagros suture occur in the Middle East;the Tibet and Southeast Asia are characterized by multi-block riftings from Gondwana and multi-stage collisions with the Eurasia continent.The negative buoyancy of subducting oceanic slabs can be considered as the main engine for northward drifting of Gondwana-derived blocks and subduction of the Neo-Tethys Ocean.Meanwhile,mantle convection and counterclockwise rotation of Gondwana-derived blocks and the Gondwana continent around an Euler pole in West Africa in non-free boundary conditions also controlled the evolution of the Neo-Tethys Ocean.  相似文献   

Mechanisms and climatic-ecological effects of the Great Oxidation Event in the early Proterozoic     

Luo  Genming  Zhu  Xiangkun  Wang  Shuijiong  Zhang  Shihong  Jiao  Chaoqun 《中国科学:地球科学(英文版)》2022,65(9):1646-1672

Science China Earth Sciences - This paper briefly introduces the conception and research history of the Great Oxidation Event (GOE) in the early Paleoproterozoic and summarizes the primary...  相似文献   

The first extra-large helium-rich gas field identified in a tight sandstone of the Dongsheng Gas Field,Ordos Basin,China     

Peng  Weilong  Liu  Quanyou  Zhang  Ying  Jia  Huichong  Zhu  Dongya  Meng  Qingqiang  Wu  Xiaoqi  Deng  Shang  Ma  Yongsheng 《中国科学:地球科学(英文版)》2022,65(5):874-881

Science China Earth Sciences - Helium gas is a scarce but important strategic resource, which is usually associated with natural gas. Presently, only one extra-large helium-rich gas field has been...  相似文献   

东秦岭商丹地区富铷花岗伟晶岩脉矿化特征及其地质意义     

朱伟鹏  宋公社  许锋  杨文博  吴鹏 《地质科技情报》2022,41(3):54-67

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Does exploring the characteristics of emergency supplies really matter for disaster response operations?     

Zhu  Xiaoxin  Regan  David  Sun  Baiqing 《Natural Hazards》2022,110(1):175-189

Natural Hazards - This article aims to provide a quantitative study of immediate food supplies based on a three-stage analysis. Firstly, a numerical autoregressive integrative moving average...  相似文献   

Dynamic selection of emergency plans of geological disaster based on case-based reasoning and prospect theory     

Yao  Xin  Guo  Hai-xiang  Zhu  Jian  Shi  Yong 《Natural Hazards》2022,110(3):2249-2275

Natural Hazards - The Three Gorges reservoir area in the Yangtze River economic belt has frequent geological disasters. To assist decision-makers make effective emergency decisions based on their...  相似文献