Threat from above! Assessing the risk from the Tonghua high-locality landslide in Sichuan,China     

Wang  Dongpo  Li  Yizhi  Wang  Zhongwen  Yang  Weibin  Ouyang  Chaojun  Zhu  Xing  Scaringi  Gianvito 《Landslides》2022,19(3):731-746

Landslides - In tectonically active steep mountain belts, such as those in west Sichuan in China, frequent landslide disasters can occur during the rainy season. High-locality landslides often...  相似文献   

Guocun landslide in a slate slope with dip structure on 27 March 2021 in Tonglu County,Zhejiang Province,China     

Wang  Fawu  Zhao  Zixin  Chen  Ye  Zhu  Guolong  Nam  Kounghoon  Ye  Zhenhua 《Landslides》2022,19(6):1435-1447

On 27 March 2021, a landslide with a volume of approximately 2?×?10⁴ m³ occurred in Guocun Village next to Kengheng road in Tonglu County, Zhejiang Province, China. The landslide caused no casualties as a result of timely road closures, because of the unusual noises detected early by local residents. The motion mechanism of the landslide was studied using video analysis. Slope cutting resulting from road construction might have been the major triggering factor for the landslide. The intrusion of magma and the uplift process of Huangshan led to the metamorphism of mudstone to easily fractured slate, and the brittle layered slate might have controlled the change of motion from transitional sliding to dry debris flow.

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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   

Fractional derivative modelling for rheological consolidation of multilayered soil under time-dependent loadings and continuous permeable boundary conditions     

Ding  Pan  Xu  Riqing  Zhu  Yihong  Wen  Minjie 《Acta Geotechnica》2022,17(6):2287-2304

Acta Geotechnica - This paper investigates the one-dimensional rheological consolidation problem of multilayered soils subjected to different time-dependent loadings and continuous permeable...  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   

Variations of methane stable isotopic values from an Alpine peatland on the eastern Qinghai-Tibetan Plateau     

Guo  Qian  Peng  Haijun  Hong  Bing  Yao  Hu  Zhu  Yongxuan  Ding  Hanwei  An  Ning  Hong  Yetang 《中国地球化学学报》2021,40(4):473-483

Acta Geochimica - Isotopic signature is a powerful tool to discriminate methane (CH4) source types and constrain regional and global scale CH4 budgets. Peatlands on the Qinghai-Tibetan Plateau are...  相似文献   

2019年甘肃夏河Ms5.7地震前后重力场异常特征分析     

杨雄  祝意青  申重阳  赵云峰 《地球科学进展》2021,36(5):510-519

地震的孕育发生过程伴随着构造运动、物质迁移和密度变化,将引起地球重力场变化,流动重力重复观测有可能捕捉到与地震孕育有关的前兆信息,从而为中短期地震预测提供重要依据.基于南北地震带2017-2020年的流动重力观测资料,获得了甘东南地区的区域重力场时空变化图像,分析了区域重力场动态变化及其与2019年甘肃夏河Ms 5.7地震发生的关系.结果 表明:①震前测区重力异常变化等值线与临潭—宕昌断裂走向基本一致,且在震中附近出现四象限分布特征,夏河Ms5.7地震发生在重力高梯度带和四象限中心附近;②地震前后区域重力场经历了"区域性重力异常—四象限分布特征—反向变化发震"的时空演化过程;③九寨沟地震的发生可能引起附近断层区域应力场的调整,从而加速了夏河地震的发生;④区域重力场时变与临潭—宕昌断裂在空间上有较好的对应,综合分析可认为该次地震的发震断裂为临潭—宕昌断裂.  相似文献   

论中国国家公园地质考察与评价——以浙江丽水百山祖国家公园为例     

李玉辉  王志国  毛烨峰  朱浙辉  陈林  李春忠  李鑫  孟耀 《地质论评》2021,67(4):67050002-67050002

鉴于保护地调查评价历史与目标,国家公园地质考察评价基准是地质学关于地球的“时间、空间、演化”知识的发现路径,既识别国家公园候选地的国家符合性地质事件,又识别国家公园自然性、独特性、优美性、多样性、整体性的地质机制,提供国家公园最重要的自然生态系统与自然景观保育管理的地质学支撑。浙江丽水百山祖国家公园符合性的地质事件是公园发现的4.0~4.2 Ga冥古宙陆核物质的锆石晶体、中生代岛弧陆盆火山酸性火山岩系列和从流纹岩山岭到花岗岩—变质岩谷底的“峰—岭—丘—谷（盆）”的亚热带滨海山地地貌结构,地貌结构发育演化是百山祖公园最重要的自然生态系统、区域性流域水源地、独特山水景观的形成基础。保护百祖山公园地貌结构和过程的完整性与真实性是确保其重要自然生态系统自然演化和生态服务产品持续供给的基础。  相似文献