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Internal erosion characteristics and microstructure effects of undisturbed loess

Journal of Mountain Science 2024年第11期21卷 3630-3649页

作者： ZHANG Buping ZHU Xinghua CHENG Yuxiang aamir asghar Department of Geological Engineering Chang'an UniversityXi'an 710064China Key Laboratory of Western China's Mineral Resources and Geological Engineering Ministry of EducationXi'an 710054China Institute of Earth Sciences University of Poonch RawalakotRawalakot 12350Pakistan

Loess internal erosion caused by preferential flow often leads to serious loess ground collapse,shallow loess landslides,and other geological ***,there is a lack of quantitative evaluation of the internal erodibility of undisturbed loess under the action of preferential flow,and little is known about the correlation between the internal erodibility of loess and its *** this study,we carried out a series of hole erosion tests(HET)on undisturbed loess samples from 4 typical locations on China's Loess *** internal erodibility of loess was quantitatively evaluated through an improved HET method,and its association with initial water content,clay content,and initial water head difference was *** the microscopic scale,the microstructure of loess with different clay content was measured by scanning electron microscopy(SEM).The correlation between pore and particle microstructure parameters and loess internal erosion parameters was established based on grey correlation *** the initial water content increased from 10%to 36%,the erodibility index increased from 1 to *** the clay content increased from 8%to 27.95%,the erodibility index increased 3.5 *** increase of initial water head difference has a positive linear effect on the internal erodibility of *** microstructure analysis shows that with the increase of clay content,the microstructure of undisturbed loess changes from a mosaic structure to a cementation structure,which creates favourable conditions for controlling the internal erosion of *** grey correlation analysis,it has been determined that the microstructure of undisturbed loess has a significant correlation with the critical shear stress,and the loess microstructure morphology strongly correlates with the erosion *** normal circumstances,the higher the clay content,the better the erosion resistance,the better the mechanical stability,and the easier to form a stable cave in

关键词： Undisturbed loess Preferential flow Internal erosion Hole erosion test Microstructure effect Loess Plateau

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Integrating predictive modeling techniques with geospatial data for landslide susceptibility assessment in northern Pakistan

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Journal of Mountain Science 2023年第9期20卷 2603-2627页

作者： aamir asghar SU Li-jun ZHAO Bo Nadeem Ahmad USMANI Key Laboratory of Mountain Hazards and Earth Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of Sciences(CAS)Chengdu 610041China University of Chinese Academy of Sciences Beijing 100049China China-Pakistan Joint Research Center on Earth Sciences CAS-HECIslamabad 45320Pakistan The University of Poonch Rawalakot Rawalakot 12350Pakistan

The eastern road section of the ChinaPakistan Economic Corridor(CPEC)traverses the challenging terrain of northern Pakistan,where frequent landslides pose a significant threat to socioeconomic development and ***,the insufficient data on landslide hazards presents a substantial challenge to practical mitigation ***,we conducted an extensive study to gain insight into landslide assessment along the Mansehra-Muzaffarabad-Mirpur and Mangla(MMMM)*** study involved preparing a landslide inventory,analyzing landslide causative factors,and developing landslide susceptibility models(LSMs)using published data,remote sensing interpretations,field excursions and integrated predictive *** first used Pearson's correlation coefficient(PCC),variable importance factors(VIF),and information gain ratio(IGR)to evaluate multicollinearity among the selected landslide causative factors(LCFs).Then,the topographic roughness index(TRI)with VIF>5 and PCC>0.7 was considered a redundant factor and thus removed before the data ***,we adopted multiple machine-learning methods to analyze landslide *** results indicate that the landslide inventory contains 1,776 events,of which 674 were classified based on geometrical and lithological *** IGR results show that the rainfall,lithology,PGA,drainage density,slope,and distance to fault are the most effective *** AUC values for random forest(RF)(0.901),extreme gradient boosting(XGBoost)(0.884),and K-nearest neighbor(KNN)(0.872)remained higher than evidential belief function(EBF)(0.833),weight of evidence(WoE)(0.820),and certainty factor(CF)(0.810),*** RF model outperformed all other models in terms of ***,these models are accurate but newer in the area;thus,susceptible zones were verified with comprehensive field *** northern and central regions accounted for the high and very high susceptibility classes in th

关键词： Landslides MMMM expressway Machine learning Landslide susceptibility Northern Pakistan

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巴基斯坦北部某大型公路滑坡的形成机理

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土木与环境工程学报（中英文） 2024年第6期46卷 52-69页

作者： asghar aamir 苏立君赵波 NIAZ Abrar ULLAH Faheem 中国科学院山地灾害与地表过程重点实验室中国科学院、水利部成都山地灾害与环境研究所成都610299 中国科学院大学北京100049 中国-巴基斯坦地球科学联合研究中心伊斯兰堡巴基斯坦 Poonch Rawalakot大学 Rawalakot 12350巴基斯坦 Azad Jammu and Kashmir大学 Muzaffarabad 13100巴基斯坦

滑坡是山区公路安全运行的重要威胁,开展滑坡灾害评估尤为重要,尤其是深切峡谷区域的公路滑坡。以巴基斯坦北部Muzaffarabad-Mansehra公路沿线某大型滑坡为研究对象,采用野外调查、遥感分析、地貌解译、地球物理探勘和运动学分析等多种... 详细信息

滑坡是山区公路安全运行的重要威胁,开展滑坡灾害评估尤为重要,尤其是深切峡谷区域的公路滑坡。以巴基斯坦北部Muzaffarabad-Mansehra公路沿线某大型滑坡为研究对象,采用野外调查、遥感分析、地貌解译、地球物理探勘和运动学分析等多种调查手段,进行滑坡的失稳特征、触发机理、地下结构特征和边坡稳定评估等研究,结果表明:滑坡发生在Hazara地层中,该地层以顺层斜坡为主,容易发生翘曲变形等破坏,属于滑坡易发地层。地球物理探勘表明:滑坡体内部存在多个不同深度和厚度的复杂结构,低电阻率区(0.325~1350Ω·m)以松散、饱水的堆积体为主,高电阻率区域(1510~26092Ω·m)与覆盖层有关,包括冲积层、巨石和干板岩碎片等。地震反射层分析结果表明,在高度饱和的覆盖层、改造区块和表层风化层内,P波速度较低(400~1800 m/s);而下垫层散布着高密度岩石碎片和大块巨石,P波速度为3000~5000 m/s。两种地球物理探勘结果均表明滑坡体内有一条延伸30 m深的破碎带,这是触发滑坡的重要因素。滑坡顶部的滑动面在深度25~30 m处,主体处的滑动面深度在45 m处。运动学分析表明:锲形体失稳是公路滑坡的主要破坏模式。研究结果表明,采用综合技术分析滑坡灾害的潜在机制可以有效减轻此类灾害带来的相关风险。

关键词： Lohar Gali滑坡片状岩石地貌学地球物理成像巴基斯坦北部

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巴基斯坦北部某大型公路滑坡的形成机理（英文）

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土木与环境工程学报(中英文) 2023年

作者： aamir asghar 苏立君赵波 ABRAR Niaz Faheemullah 中国科学院山地灾害与地表过程重点实验室中国科学院水利部成都山地灾害与环境研究所中国科学院大学中国-巴基斯坦地球科学联合研究中心 Poonch Rawalakot大学 Azad Jammuand Kashmir Muzaffarabad大学

公路滑坡是山区公路安全运行的重要威胁，开展滑坡灾害评估尤为重要，尤其是深切峡谷区域的公路滑坡。以巴斯基坦北部Muzaffarabad-Mansehra公路沿线某大型滑坡为研究对象，采用野外调查、遥感分析、地貌解译、地球物理探勘和运动学分... 详细信息

公路滑坡是山区公路安全运行的重要威胁，开展滑坡灾害评估尤为重要，尤其是深切峡谷区域的公路滑坡。以巴斯基坦北部Muzaffarabad-Mansehra公路沿线某大型滑坡为研究对象，采用野外调查、遥感分析、地貌解译、地球物理探勘和运动学分析等多种调查手段，进行滑坡的失稳特征、触发机理、地下结构特征和边坡稳定评估等研究，结果表明：滑坡发生在Hazara地层中，该地层以顺层斜坡为主，容易发生翘曲变形等破坏，属于滑坡易发地层。地球物理探勘表明：滑坡体内部存在多个不同深度和厚度的复杂结构组成，低电阻率区（0.325～1350Ωm）以松散、饱水的堆积体为主，高电阻率区域（1510～26092Ωm）与覆盖层有关，包括冲积层、巨石和干板岩碎片等。地震反射层析结果表明，在高度饱和的覆盖层、改造区块和表层风化层内，P波速度较低（400～1800 m/s）；而下垫层散布着高密度岩石碎片和大块巨石，P波速度在3000～5000 m/s。两种地球物理探勘结果均表明滑坡体内有一条延伸30m深的破碎带，这是触发滑坡的重要因素。滑坡顶部的滑动面在深度25～30m处，在主体处的滑动面深度在45m处。运动学分析表明：锲形体失稳是公路滑坡的主要破坏模式。研究结果表明，采用综合技术分析滑坡灾害的潜在机制可以有效减轻此类灾害带来的相关风险。

关键词： Lohar Gali滑坡片状岩石地貌学地球物理成像巴基斯坦北部

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吉贾尔-帕坦喀喇昆仑公路沿线落石和边坡稳定性数值研究

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土木与环境工程学报（中英文） 2021年第1期43卷 36-47页

作者： ALI Izaz 苏立君 asghar aamir ALAM Mehtab 刘振宇董志博 FAIZ Hamid 中国科学院山地灾害与地表过程重点实验室中国科学院、水利部成都山地灾害与环境研究所成都610041 中国科学院大学北京100049 中国科学院青藏高原地球科学卓越创新中心北京100101 中国-巴基斯坦地球科学联合研究中心巴基斯坦伊斯兰堡

在中巴经济走廊的重要通道喀喇昆仑公路(KKH)沿线,由于构造运动和降雨渗透对破碎岩石和边坡稳定性的不利作用,造成了大量落石和不稳定边坡。利用数值软件DIPS、GeoRock 2D和SLIDE对巴基斯坦北部吉贾尔-帕坦喀喇昆仑公路沿线的落石和边... 详细信息

在中巴经济走廊的重要通道喀喇昆仑公路(KKH)沿线,由于构造运动和降雨渗透对破碎岩石和边坡稳定性的不利作用,造成了大量落石和不稳定边坡。利用数值软件DIPS、GeoRock 2D和SLIDE对巴基斯坦北部吉贾尔-帕坦喀喇昆仑公路沿线的落石和边坡稳定性进行了数值研究;以喀喇昆仑公路沿线两个主要的易受落石影响的路段为例,研究落石和边坡的失稳机理。对4组节理进行的赤平投影分析表明:两处边坡断面均易发生平面破坏和楔形破坏。基于极限平衡理论,在静力条件下,边坡断面1的安全系数为0.917,处于不稳定状态,边坡断面2的安全系数为1.131,处于欠稳定状态;但在地震条件下,两处断面边坡的安全系数均小于1,处于不稳定状态。研究结果表明,边坡断面1和断面2的落石回弹高度分别为33m和29m。边坡断面1的落石速度在0.5~44m/s,总动能达到1135.099kJ,而边坡断面2的落石具有0.5~40.901m/s的速度和973.012kJ的破坏能力。研究表明,KKH沿线的落石和滑坡具有极大的破坏潜力。

关键词：喀喇昆仑公路岩质陡坡赤平投影分析法边坡稳定性动力过程

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Thermophoresis and concentration effects in a fourth grade peristaltic flow with convective walls

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Journal of Central South University 2017年第7期24卷 1654-1662页

作者： Ali aamir asghar S Awais M Department of Mathematics COMSATS Institute of Information TechnologyAttock 43600Pakistan Department of Mathematics COMSATS Institute of Information TechnologyIslamabad 44000Pakistan Department of Mathematics King Abdulaziz UniversityJeddah 21432Saudi Arabia

In this investigation,we have studied the peristaltic fluid flow in an asymmetric channel with convective *** grade fluid model has been utilized in view of the fact that the results of all other differential type models can be deduced as the special *** effects of heat and mass transfer are *** thermophoresis effects occur in the energy *** heat and mass boundary conditions have been given special *** wave length and low Reynolds number approximations are utilized for the *** analytic solutions for the velocity,temperature and concentration profiles are calculated using perturbation technique and elaborated in the form of graphical observations for various physical quantities.

关键词： fourth grade fluid convective boundary conditions pumping and trapping peristalsis

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Existence of a Hartmann layer in the peristalsis of Sisko fluid

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Chinese Physics B 2014年第5期23卷 368-372页

作者： Saleem asghar Tayyaba Minhas aamir Ali Department of Mathematics COMSATS Institute of Information Technology Department of Mathematics King Abdul Aziz University CNRS UMR 7351 Laboratoire Jean Alexandre DieudonneUniversite de Nice Sophia Antipolis

Analytical solutions for the peristaltic flow of a magneto hydrodynamic （MHD） Sisko fluid in a channel, under the effects of strong and weak magnetic fields, are presented. The governing nonlinear problem, for the strong magnetic field, is solved using the matched asymptotic expansion. The solution for the weak magnetic field is obtained using a regular perturbation method. The main observation is the existence of a Hartman boundary layer for the strong magnetic field at the location of the two plates of the channel. The thickness of the Hartmann boundary layer is determined analytically. The effects of a strong magnetic field and the shear thinning parameter of the Sisko fluid on the velocity profile are presented graphically.

关键词： magneto hydrodynamic Sisko fluid asymmetric channel Peristaltic flow non-Newtonian fluid

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Evaluating therapeutic potential of coriander seeds and leaves(Coriandrum sativum L.) to mitigate carbon tetrachloride-induced hepatotoxicity in rabbits

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Asian Pacific Journal of Tropical Medicine 2018年第3期11卷 209-213页

作者： Muhammad Jawad Iqbal Masood Sadiq Butt aamir Shehzad Muhammad asghar National Institute of Food Science & TechnologyFaculty of FoodNutrition and Home SciencesUniversity of AgricultureFaisalabadPakistan Department of Biochemistry Unirersity of AgricultureFaisalabadPakistan

Objective: To evaluate the hepatic and renal protective potential of coriander seeds and leaves using animal feed model. Methods: Coriander seeds-and leaves-based sauces were administrated to normal(Study Ⅰ) and carbon tetrachloride(2 mL/kg B.W.)-induced hepatotoxic rabbits(Study Ⅱ). Hepatic and renal biomarkers like aspartate aminotransferase,alanine aminotransferase. alkaline phosphatase, superoxide dismutase and catalase were measured. Results: Coriander leaves-based sauce exerted more decline(P<0.05) in serum aspartate aminotransferase, alanine aminotransferase and alkaline phosphatase levels in the study Ⅱ as 18.32%. 19.91% and 21.24%, respectively. While, hepatic superoxide dismutase and catalase levels were raised significantly(P<0.05) in both studies. Renal parameters also depicted positive impact by the provision of developed sauces. Conclusions: Coriander seeds and leaves based sauces are effective in alleviating the hepato/renal toxicity. The hepatoprotective effect of coriander leaves is more pronounced as compared to coriander seeds.

关键词： Coriander seeds Coriander leaves Hepatoprotective potential Hepatotoxicity Rabbits

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Risk-aware Distributed Optimal Power Flow in Coordinated Transmission and Distribution System

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Journal of Modern Power Systems and Clean Energy 2021年第3期9卷 502-515页

作者： aamir Nawaz Hongtao Wang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250000China

Active distribution grids cause bi-directional power flow between transmission system(TS)and distribution system(DS),which not only affects the optimal cost but also the secure operation of the power *** paper proposes a hybrid coordination method to solve the risk-aware distributed optimal power flow(RA-DOPF)problem in coordinated TS and *** operation risk evaluation,the weather-based contingencies are considered in both TS and DS.A hybrid coordination method is developed that entails analytical target cascading(ATC)and Benders decomposition(BD).Moreover,the risk-aware optimal power flow(RAOPF)in TS and risk-based security-constrained optimal power flow in DS have been performed using the BD method considering basic optimal power flow as a master problem,whereas N-1 and N-2 contingencies are considered as *** case studies are performed using the IEEE 30-bus system with generation reserves as a TS and a 13-bus system as a *** results demonstrate the efficacy of the proposed method.

关键词： Analytical target cascading Benders decomposition distribution system preventive and corrective contingen-cies risk awareness transmission system

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Distributed Stochastic Security Constrained Unit Commitment for Coordinated Operation of Transmission and Distribution System

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 708-718页

作者： aamir Nawaz Hongtao Wang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250000China

With the high penetration of renewable energies in modern power systems,deterministic coordination algorithms are facing two major problems:one is degradation in accuracy if fewer scenarios are utilized for uncertainty evaluation while second is the high computational time if a high number of scenarios are considered for better accuracy・In both cases,the efficiency of the algorithm is degraded・To solve these problems in coupled transmission system and distribution systems(TSDS),probabilistic coordination algorithms are adopted to solve with less *** this paper,a TSDS probabilistic coordination model is proposed to solve the coordinated security-constrained unit commitment problem.A mean and standard deviation matching based probabilistic analytical target cascading algorithm has been utilized for evaluation of TSDS coordination *** of solving each scenario as a separate problem,the proposed algorithm considers a single coordination problem with probabilistic characteristics as shared variables and hence,achieves fast convergence・Different case studies are performed to prove the efficacy of the proposed *** verify that the proposed algorithm reduces computational time and resources for large-scale systems.

关键词： Distribution system mean probabilistic analytical standard deviation target Cascading transmission system

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