Characteristic and Stability Analysis for Loess Seismic Landslide in Valley City

2012 ◽  
Vol 594-597 ◽  
pp. 1856-1863
Author(s):  
Wang Nai ◽  
Lan Min Wang ◽  
Zhong Xia Yuan ◽  
Wang Qian
Keyword(s):  
Scientific Basis ◽  
Earthquake Risk ◽  
Disaster Prevention ◽  
Loess Landslide ◽  
Loess Area ◽  
Loess Landslides ◽  
Basic Characteristics ◽  
Seismic Landslide ◽  
Landslide Disaster ◽  
Valley City

In the light of heavy seismic landslide disasters in the valley city of loess area, 104 typical loess landslides caused by the 1654 Tianshui(Ms 8.0), 1718 Tongwei(Ms 7.5) and 1920 Haiyuan(Ms 8.5) earthquakes were studied, main landslide type and basic characteristics of seismic landslide in the valley city were analyzed. The landslides in the valley city of loess area are divided into three types: homogeneous loess landslide, loess interface landslide and loess-mudstone cutting layer landslide. Through the investigation and analysis of earthquake risk, the suggestion about the 22 dangerous landslides in Tianshui is given. The study is expected to supply scientific basis for seismic landslide disaster prevention and reduction in valley city of loess area.

Lvliang Typical Loess Landslide Mechanism and Characteristics

2011 ◽  
Vol 90-93 ◽  
pp. 1313-1317 ◽  
Author(s):  
Dong Qi Tang ◽  
Jian Bing Peng ◽  
Qi Yao Wang ◽  
Ji Shan Xu
Keyword(s):  
Scientific Basis ◽  
Economic Activities ◽  
Loess Landslide ◽  
Main Research ◽  
Loess Area ◽  
Landslide Mechanism ◽  
Geological Disasters ◽  
Loess Landslides

The loess area ecology environment is very fragile, happening various geological disasters, loess landslides is one of the most mainly the geological disasters in loess area. Lvliang region loess hilly develops common, with the human economic activities increasing, inducing a lot of loess landslides. Taking typical loess landslides as the main research object, the loess landslides of Lvliang region from two aspects of characteristics and mechanism are analyzed. It is considered that the main types of the loess landslides are located within the layer of loess. Landslide is controlled by topography and lithology, landslide mechanism is induced by human economic activities. Through research for the region loess landslides hazard prevention provide the scientific basis.

scholarly journals Mechanistic Investigation of Typical Loess Landslide Disasters in Ili Basin, Xinjiang, China

2021 ◽  
Vol 13 (2) ◽  
pp. 635
Author(s):  
Maoguo Zhuang ◽  
Wenwei Gao ◽  
Tianjie Zhao ◽  
Ruilin Hu ◽  
Yunjie Wei ◽  
...  
Keyword(s):  
Leading Edge ◽  
Slope Surface ◽  
Loess Landslide ◽  
Geological Investigation ◽  
Fluvial Erosion ◽  
Movement Characteristics ◽  
Mechanistic Investigation ◽  
Loess Landslides ◽  
Xinjiang Autonomous Region ◽  
Landslide Disaster

In the period from 2010 to 2018, a total of 302 geological disasters occurred in the Xinjiang Autonomous Region, China, of which 136 occurred in the Ili Basin. Compared with those in other regions, the loess landslides in the Ili Basin are strongly influenced by the seasonal freeze–thaw effect. Taking the No. 2 Piliqinghe landslide as an example and based on the field geological investigation, it was found in the present study that the main triggering factors of this landslide were the snowmelt erosion of the slope toe and meltwater infiltration into the trailing edge of the slope. The mechanism of loess landslide instability was studied using numerical simulation. The results showed that (1) the Piliqinghe landslide disaster was formed through a process composed of the local sliding of the leading edge → the creep sliding and tension cracking of the slope surface → the overall sliding stage; (2) the infiltration of snowmelt was the direct cause of the landslide formation; (3) the fluvial erosion and softening caused the soil of the slope toe to slide. The results can be used as a reference for the analysis of the disaster mechanism and movement characteristics of similar loess landslides.

Engineering Loess Landslides Types and some Research Thoughts

2011 ◽  
Vol 90-93 ◽  
pp. 1291-1294
Author(s):  
Dong Qi Tang ◽  
Jian Bing Peng
Keyword(s):  
Economic Development ◽  
Water Activity ◽  
Underground Mining ◽  
Mechanical Vibration ◽  
Mining Activities ◽  
Loess Landslide ◽  
Loess Area ◽  
Vibration Effect ◽  
Loess Landslides ◽  
Main Effects

With the rapid economic development of loess area, engineering loess landslides have become a serious danger to loess area people. It is an important engineering geological problem. Through making classify narrate to the harmful of engineering loess landslides. The main effects of engineering loess landslides are divided into four types. First type is human water activity cause loess landslides. Second is load and unload activities cause the loess landslides. Third is mechanical vibration effect inducing loess landslide. Fourth, loess landslides are induced by underground mining activities. Presents the performance characteristics and take conceive of engineering loess landslides to further research advances.

The Physical and Mechanic Properties of the Loess Landslide

2012 ◽  
Vol 446-449 ◽  
pp. 3003-3006
Author(s):  
Li Hua Li ◽  
Meng Dang ◽  
Heng Lin Xiao ◽  
Hui Ming Tang
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Internal Friction ◽  
Water Content ◽  
Maximum Shear Stress ◽  
Friction Angle ◽  
Dry Density ◽  
Disaster Prevention ◽  
Loess Landslide ◽  
Landslide Disaster

The loess landslide in BaDong city, HuBei province China suffers great losses, which is an extremely typical landslide disaster. Variation in water level in the Yangtse River and rainfall has enormous influence on the loess landslide disaster. Some tests on loess have been done, which mainly include water content influence on shear strength of the loess, the relation between water content and dry density etc. The results have shown that When the water content average increasing with 3%, the cohesive strength reduces with 57%，49%，54% respectively and the internal friction angle average reduces 43%. The bigger the water content, the bigger the shear displacement at the same imposed load. When water content average increases with 3%, the corresponding maximum shear stress reduces with 50%, which may be in favor of loess landslide disaster prevention.

The Records of Slope Reinforcement Engineering in a Loess City

2012 ◽  
Vol 226-228 ◽  
pp. 1365-1370
Author(s):  
Qi Xia Liu ◽  
Liang Fan
Keyword(s):  
Slope Stability ◽  
Good Practice ◽  
Stability Study ◽  
Practice Effect ◽  
Slope Instability ◽  
Loess Landslide ◽  
Loess Area ◽  
Loess Slope ◽  
Geological Conditions ◽  
Reinforcement Measures

This article selected a typical loess slope engineering as the research object, and through the characteristics of loess landslide, landslide environmental geological conditions, the formation mechanism of the landslide study of the loess area of urban slope instability factors, loess slope stability of the calculation method and reinforcement measures. This paper adopts the theory of Morgenstern-Price to analyzing the stability of the slope, referencing with Sweden finite slice method, Simplified Bishop method, Simplify Janbu method. The reinforcement adopts the technology of possessed anchor to disposing the loess slope, and has good Practice effect. The loess slope stability study area has a large reference.

A Primary Assessment of Society-Based Earthquake Disaster Mitigation in Kabul City, Afghanistan

2017 ◽  
Vol 12 (1) ◽  
pp. 158-162
Author(s):  
Mohammad Kazem Naseri ◽  
◽  
Dongshik Kang ◽  
Keyword(s):  
Public Awareness ◽  
Disaster Mitigation ◽  
Capital City ◽  
Earthquake Risk ◽  
Disaster Prevention ◽  
Earthquake Disaster ◽  
Prevention Education ◽  
Private And Public ◽  
Disaster Education ◽  
School Curricula

A questionnaire-based survey was carried out in the 13th district of Kabul, the capital city of Afghanistan. For this purpose, 10 high schools, both private and public, were selected randomly. A total of 324 participants responded to the questions in the questionnaire. From the total respondents, 127 (39.2%) were female and 197 (60.8%) male; all were in the 15 to 25 age range. Most of the students (75%) had experienced an earthquake, but their perceptions and knowledge about earthquake mitigation were not good as over 50% did not know what to do during an earthquake. Regarding the current situation, 64% responded that disaster education had not been included in their school curricula. The wide participation and strong interest of the students in this survey are expected to foster further research and investigation, as the majority of them (70%) were in a position to transfer their knowledge about earthquake disaster mitigation to their families. Based on the survey findings, despite the contribution of students who had already experienced disaster education outside of Afghanistan, students’ disaster mitigation knowledge was undeniably poor. There is a clear need to establish and plan for the disaster prevention education system in Afghanistan. There is a lack of understanding regarding effective behaviors, attitudes, and knowledge. This problem was probably caused by the absence of disaster education, teaching materials, and expert staff. Therefore, it is highly recommended to integrate disaster prevention education into school curricula, reduce the earthquake risk by sharing disaster information through students’ parent council meetings at schools, and improve public awareness in order to create a society that is resilient to earthquakes.

The Analysis of General Entropy in Harmonious Management for Nature Tourism and Eco-Environmental Protection

2012 ◽  
Vol 573-574 ◽  
pp. 260-265 ◽  
Author(s):  
Xiang Yang Jiang
Keyword(s):  
Environmental Protection ◽  
Entropy Production ◽  
Nature Reserve ◽  
Scientific Basis ◽  
Production Model ◽  
Nature Tourism ◽  
Natural Reserve ◽  
Far From Equilibrium ◽  
Basic Characteristics ◽  
Reserve System

Reserve system is a far from equilibrium nonlinear complex systems, and paradigms that make use of linear scientific is difficult to grasp its essence. Based on the basic characteristics of nature reserve systems, utilize ultra-entropy production model, revealing the reserve system evolution, provide a scientific basis to the natural reserve tourism development and the harmony management of the ecological and environmental protection.

scholarly journals The loess landslide on 15 march 2019 in Shanxi Province, China

Landslides ◽  
2020 ◽  
Vol 17 (3) ◽  
pp. 677-686
Author(s):  
Wenhui Shi ◽  
Yanrong Li ◽  
Weiwei Zhang ◽  
Jin Liu ◽  
Shengdi He ◽  
...  
Keyword(s):  
Lessons Learned ◽  
Shanxi Province ◽  
Deep Soil ◽  
Weak Zone ◽  
Loess Landslide ◽  
Perched Water ◽  
Landslide Event ◽  
Loess Landslides ◽  
Triggering Mechanisms ◽  
Mass Volume

AbstractOn 15 March 2019, a fatal deep-seated landslide occurred at the village of Zaoling in Xiangning County of Shanxi Province, China. Extending to an area of about 120 m by 85 m, with an estimated displaced mass volume of 72,000 m3, the landslide left 20 people dead, 13 injured, and 8 buildings destroyed. There were no precursory signals prior to the event, and usual triggering mechanisms for a landslide were absent. Investigation conducted immediately after the incident revealed that the landslide was initiated in a 1.0 to 1.5-m thick-softened layer located at 40 m depth along the contact between the loess and interbedded paleosol layer. This softened layer was highly saturated due to the perched water on top of the relatively impervious paleosol layer and became a critical weak zone since the shear strength of loess is very sensitive to water content. We suggest that the perched water originated from extensive long-term unsaturated seepage of rainwater and local rapid percolation along preferential channels such as sinkholes and root network. The Zaoling landslide confirms that unlike most landslides in non-loess areas, loess landslides can occur without identifiable triggering events. They can result from gradual build up of instability due to slow (in the span of hundred years) accumulation of deep soil water. Based on the lessons learned from this landslide event, suggestions are given for the planning of urban and rural development in loess areas. Due to the fact that the process leading to the development of such a landslide is largely concealed, further research should be aimed at gaining a more thorough understanding of the mechanism of this landslide type.

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