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RISS 인기검색어
- 검색키워드
- 저자 : Menglong Dong (검색결과 4 건)
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Influence of a Dominant Fault on the Deformation and Failure Mode of Anti-dip Layered Rock Slopes
Menglong Dong,Faming Zhang,Cheng Yu,Jingqing Lv,Huixin Zhou,Yukun Li,Yiyan Zhong 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.8
Toppling is a kind of failure mode that commonly exists in anti-dip rock slopes. Toppling deformation has a great influence on the stability of rock slopes, which often leads to geological disasters such as sliding and collapse of anti-dip slopes. However, a large number of faults and other structural planes will be produced in many rock slopes due to the action of geological structure movement. In the investigation, it is found that there are not only toppling deformation,but also faults and other geological structures in the toppling deformation rock slope. Previous studies have calculated the depth of toppling deformation, which is considered from the development characteristics of toppling deformation itself. In this paper, based on the field investigation of the anti-dip rock slope with bedding faults, the relationship between the depth of toppling deformation and the location of faults is analyzed by three-dimensional discrete element method. When the dominant structural plane and toppling fracture surface exist at the same time, the main factors affecting the failure of the reverse dip rock slope can be obtained by determining the different depths of the two planes. The final failure depth and failure mode of the toppling deformation in an anti-dip rock slope with a dominant structural plane can be preliminarily determined.
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Study of Stability Influencing Factors of Excavated Anti-Dip Rock Slope
Menglong Dong,Faming Zhang,Jingqing Lv,Yin Fei,Zinan Li 대한토목학회 2020 KSCE JOURNAL OF CIVIL ENGINEERING Vol.24 No.8
A layered rock slope often forms an anti-dip state due to tectonic movement in the historical past. In the mountainous gorge area of Southwest China, the layered rock slopes are prone to toppling and deformation due to the influence of gravity and in situ stress. The stability of these slopes after excavation is very important. The failure modes and laws of anti-dip slopes are mainly affected by factors such as lithology, dip angle and rock thickness. In this paper, the excavation process of a slope was simulated by the discrete element method, and the stability after slope excavation was analysed by comparison with field monitoring data, taking the high rock slope of a hydropower station as an example. In addition, the influence of different factors on the anti-dip rock slope was analysed by setting different factors in the model. The rock thickness was set to 5, 10, 15, 20, 25, 30 and 35 metres for the same excavated model. The dip angle of the rock was set to 65, 70, 75, 80 and 85 degrees. Two major lithologies, hard rock (sandstone) and soft rock (slate), were considered in this study. The results show that the thickness and dip angle of the rock strata affected the scale of the deformation zone and the stability of the anti-dip stratified slope. However, the lithology of the anti-dip rock slope determined the failure mode of toppling failure.
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Menglong Dong,Faming Zhang,Mengjiao Hu,Chang Liu 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.8
The toppling deformation of a rock mass is an important form of rock slope failure that often occurs during the excavation process of anti-dip rock slopes. The toppling deformation is very important for controlling slope deformation, determining reasonable anchorage support modes and ensuring the effectiveness of support measures during construction and operation. In this paper, an indoor test was designed and an indoor test model was developed according to engineering practice and the analogy method to study the influence of the anchorage angle and find the most suitable anchoring method for a soft-hard interbedded toppling deformed rock mass. The effect of different anchorage angles on the anchorage effect of toppled deformation slopes was studied by indoor tests. The number of cracks, the number of broken fractures, the average depth of broken fractures, the number of toppling-bending slabs, and the average bending angle of the model were determined through the tests. According to the comprehensive results of the test analysis and analytic hierarchy process, an anchorage angle of 45° is optimal. The results obtained by the test analysis and the analytic hierarchy process were consistent. The test and analysis results have a guiding significance for engineering applications and help to select the best anchorage angle and anchorage mode for actual soft-hard interbedded toppling deformation slopes.
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Yugan He,Qi Yan,Xiaoyu Chang,Meiying Zhu,Weiwei Wang,Menglong Dong,Lianjie Song,Junjiao Yang,Yaodong Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.5
A TiO2 photocatalyst with peony-like microstructures and a large percentage of exposed {001} facets was synthesized using a facile solvethermal method. The peony-like TiO2 was obtained using HF as a capping agent, TiCl4 as the precursor and ethanol as the solvothermal agent. The parameters which influence the mophology and formation mechanism of the products including the HF concentration, the reaction time and temperature and the solvothermal solvent, were investigated. The samples were characterized using field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction and N2 adsorption and desorption analysis. As the reaction time or reaction temperature increased, the morphology TiO2 changed from hexagonally assembled microspheres to peony-like microflowers which were composed of stacks of ultrathin nanosheets. The other reaction parameters also play a crucial role in the formation of the TiO2 microstuctures. Photocatalytic experiments showed that the synthesized TiO2 out-performed Degussa P25 in the photodegradation of methelene blue under a very weak UV light irradiation (power: 8 W, light intensity: 0.4mW cm -1).
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