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RISS 인기검색어
- 검색키워드
- 저자 : ( Hu Xiewen ) (검색결과 3 건)
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Root Characteristics and Its Influences on Shear Strength in Burned Areas
( Xiewen Hu ),( Yiteng Hou ),( Yan Wang ),( Ying Yang ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
As the typical source of debris flow after fire, the initiation of shallow surface landslides was closely linked to the change of root characteristics in fire affected soil. In order to study the influence of fire on soil strength, a series of tensile tests and direct shear tests were conducted to compare the differences of soil properties in burned and unburned area on root system and soil shear strength, using the root and soil sample obtained in burned area of Zhengdou Township, Xiangcheng County, Sichuan Province. As a consequence, the number of roots, root diameter, root mass density and root length density in the superficial soil of burned area decreased in contrast to unburned soil, in which decreased by 23.15%, 51.35%, 62.98% and 29.10% separately. The tensile force of single root inversely linked to root diameter, while the tensile strength behaved in the opposite way. The tensile force and strength in burned area was smaller than that in unburned area when it comes to the same root diameter. Laboratory shear tests shown a smaller shear strength in burned soil comparing to that of unburned soil. Compared with unburned root-soil composite, cohesion force of burned root-soil composite decreased due to root weaken, but internal friction angle behaved little change. This research shown a strength decrease of root soil composite due to weaken of root system in burned soil, and help to get more understanding of the initiation mechanism of shallow surface landslide in burned area.
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( Kun He ),( Xiewen Hu ),( Guotao Ma ),( Bo Liu ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
Deformed cracks are widely spread in landslide area, which have significant effects on geometry as well as motion patterns of landslides. A typical landslide named Baishuihe Landslide was selected here for giving a comprehensive analysis for deeply understanding about distribution, characteristics, and deformation tendency of landslide cracks. The landslide, with complicated deformation behaviors, activated in 2012 and reactivated in 2015 and 2016, respectively. Through detailed investigation, geological mapping, as well as unmanned aerial vehicle (UAV) photos interpretation, in-situ monitoring, the cracks data as well as landslide patterns were deeply studied here. It suggests that the cracks types are highly related to slope failure motion patterns. According to the penetrating depth and geometry of the cracks, it can be divided into two types: shallow cracks and deep cracks. The shallow cracks would become the margins of local failures, while the deep ones could be the foundation for further slope instability. More importantly, the potential landslide with creeping slide state is determined by both shallow and deep cracks simultaneously, which contribute to the ongoing slope deformation. Moreover, cracks change soil stress distribution and make it be limit equilibrium state, resulting in landslides under small water infiltration, and also, that can aggregate surface water and increase the probability of rainfall-induced landslides. The research work, with the perspective of cracks, can give new insight for landslide risk assessments and mitigation countermeasures for potential failure.
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Study on the Formation Mechanism of Seismic Fracture Source of Debris Flow in Strong Seismic Area
( Liu Bo ),( Hu Xiewen ) 대한지질공학회 2019 대한지질공학회 학술발표회논문집 Vol.2019 No.2
The "5.12" Wenchuan Earthquake resulted in a large number of shattering of thin ridges. Induced by heavy rainfall, such high-level shattered mountains lose stability and damage, which will produce a large number of solid materials and significantly increase the hazards of debris flows in the earthquake area. In this paper, the formation mechanism of seismic crack source is studied by large-scale shaking table physical simulation test. Under different inclination of layers conditions, the acceleration, displacement, stress, deformation and failure characteristics of different parts of the model slope are simulated to analyze the seismic response law of thin ridges. The results show that: (1) the horizontal acceleration amplification coefficient of the model increases obviously when the height is above 3/5H from the bottom of the model, and the obvious vertical acceleration amplification effect appears at 3/4H from the bottom; (2) the acceleration response intensity of the hill body of the layered structure model is greater than that of the homogeneous structure model, and the correlation with the horizontal acceleration increases with the increase of the excitation frequency. (3) For the layered structure model, the larger the dip angle of the layer, the larger the top deformation is under the same excitation intensity; (4) For the weak interlayer model, the failure location of the horizontal interlayer model is higher than that of the inclined interlayer model, and the deformation of the thin interlayer model is larger than that of the thick interlayer model.
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