Characteristics of failure area and failure mechanism of a landslide in Yingjiang County, Yunnan, China
- PDF / 13,042,479 Bytes
- 15 Pages / 595.276 x 790.866 pts Page_size
- 2 Downloads / 188 Views
Guangcheng Shi I Xiaojie Yang I Wen Chen I Hong Chen I Jicheng Zhang I Zhigang Tao
Characteristics of failure area and failure mechanism of a landslide in Yingjiang County, Yunnan, China
Abstract Due to excavations and continuous rainfall, two landslides occurred on February 9, 2018, and July 28, 2019, respectively, in the quarry of the Changdifang Reservoir engineering area, in Yingjiang County, Yunnan Province, China. The volume of the second landslide was approximately 2.4 × 105 m3, threatening the safety of construction workers and the hydropower station project construction severely. In order to explore the causes of these two landslides, the geological and hydrological conditions and the current excavation status of the landslide area were investigated, the relationship between rainfall and the displacement of the landslide body was compared and analyzed, and the landslide process and failure characteristics were described in detail. The failure mechanism of these two landslides were distinguished: (1) the poor rock mass properties, due to the strong weathering and tectonic joint of the rock mass; (2) the steep slope (of 63° in largest dip angle) induced by the slope excavation, as well as (3) the continuous heavy rainfall. The unfavorable geological condition was a determinant factor, and the combined effects of excavation and continuous rainfall were triggering factors that induced the landslide. The research results show that the displacement of the landslide body has significant seasonal characteristics. In the rainy season, there is a significant acceleration of displacement, and the slow displacement will remain for a long time after the rainy season. Consequently, it is very necessary to take reasonable slope treatment measures and continue to monitor the slope. Keywords Landslide excavation . Rainfall
. Instability mechanism . Slope . Field investigation
Introduction Landslides cause loss of life and infrastructure damage, imposing large financial costs to companies and society (Petley 2012; Massey et al. 2016; Stanley and Kirschbaum 2017). The survey revealed that from January 2004 to December 2016, a total of 55,997 people was killed from 4862 different non-seismic landslides (Froude and Petley 2018). China is also one of these countries (Lin et al. 2017a, b). The statistics from the China Statistical Yearbook demonstrated that 373,630 landslides occurred in China, which resulted in 10,996 total deaths, with approximately 690 fatalities per year during 2000–2015 (Sheng et al. 2016). The Fatal Landslide Event Inventory of China (FLEIC), which spans from 1950 to 2016, was created based on multiple data sources. The inventory contains 1911 non-seismically triggered landslides, which resulted in a total of 28,139 deaths in China during 1950–2016 (Lin and Wang 2018). Many factors induced the occurrence of landslides. Regarding internal factors, most researches focused on the failure mechanisms of weak structural planes (Tang et al. 2015; Huang et al. 2016; Zhao et al. 2016; Gu et al. 2017; Regmi et al
Data Loading...
