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Numerical analysis of surface subsidence in asymmetric parallel highway tunnels

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Journal of Rock Mechanics and Geotechnical Engineering 2017年第1期9卷 170-179页

作者： Ratan Das p.k.singh Ashutosh kainthola Suman panthee T.N.singh Department of Earth Sciences Indian Institute of Technology Bombay Department of Civil Engineering National Institute of Technology Central Department of Geology Tribhuvan University

Tunnelling related hazards are very common in the Himalayan terrain and a number of such instances have been reported. Several twin tunnels are being planned for transportation purposes which will require good understanding for prediction of tunnel deformation and surface settlement during the engineering life of the structure. The deformational behaviour, design of sequential excavation and support of any jointed rock mass are challenging during underground construction. We have raised several commonly assumed issues while performing stability analysis of underground opening at shallow depth. For this purpose, kainchi-mod Nerchowck twin tunnels(Himachal pradesh, India) are taken for in-depth analysis of the stability of two asymmetric tunnels to address the influence of topography, twin tunnel dimension and geometry. The host rock encountered during excavation is composed mainly of moderately to highly jointed grey sandstone, maroon sandstone and siltstones. In contrast to equidimensional tunnels where the maximum subsidence is observed vertically above the centreline of the tunnel, the result from the present study shows shifting of the maximum subsidence away from the tunnel centreline. The maximum subsidence of 0.99 mm is observed at 4.54 m left to the escape tunnel centreline whereas the maximum subsidence of 3.14 mm is observed at 8.89 m right to the main tunnel centreline. This shifting clearly indicates the influence of undulating topography and inequidimensional noncircular tunnel.

关键词： Twin tunnels Numerical analysis Stability Finite element method(FEM) Subsidence

Control of rock joint parameters on deformation of tunnel opening

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第4期8卷 489-498页

作者： Suman panthee p.k.singh Ashutosh kainthola T.N.singh Central Department of Geology Tribhuvan University Department of Earth Sciences Indian Institute of Technology Bombay

In this paper, stress behavior of shallow tunnels under simultaneous non-uniform surface traction and symmetric gravity loading was studied using a direct boundary element method（BEM）. The existing fullplane elastostatic fundamental solutions to displacement and stress fields were used and implemented in a developed algorithm. The cross-section of the tunnel was considered in circular, square, and horseshoe shapes and the lateral coefficient of the domain was assumed as unit quantity. Double-node procedure of the BEM was applied at the corners to improve the model including sudden traction changes. The results showed that the method used was a powerful tool for modeling underground openings under various external as well as internal loads. Eccentric loads significantly influenced the stress pattern of the surrounding tunnel. The achievements can be practically used in completing and modifying regulations for stability investigation of shallow tunnels.

关键词： Stress behavior Boundary element method(BEM) Shallow tunnels Eccentricity

Eocene lignites from Cambay basin, Western India： An excellent source of hydrocarbon

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Geoscience Frontiers 2016年第5期7卷 811-819页

作者： p.k.singh V.k.singh p.k.Rajak M.p.singh A.S.Naik S.V.Raju D.Mohanty Coal & Organic petrology Lab Centre of Advanced Study in Geology Banaras Hindu University Varanasi 221005 Uttar Pradesh India Research & Development Oil India Limited Duliajan Assam 786 602 India Central Institute of Mining and Fuel Research Barwa Road Dhanbad 826015 India

In the present paper lignites from the Cambay basin have been studied for their hydrocarbon *** samples were collected from three lignite fieldse Vastan, Rajpardi and Tadkeshwar, and were investigated by petrography, chemical analyses and Rock-Eval pyrolysis. The results are well comparable with the empirically derived values. The study reveals that these ‘low rank C＇ lignites are exceedingly rich in reactive macerals（huminite t liptinite） while inertinite occurs in low concentration. These high volatile lignites generally have low ash yield except in few sections. The Rock-Eval data indicates the dominance of kerogen type-III with a little bit of type-II. The study reveals that the lignites of Vastan（lower and upper seams） and Tadkeshwar upper seam are more gas-prone while Rajpardi and Tadkeshwar lower seams are oil-prone. Further, the fixed hydrocarbons are several times higher than the free hydrocarbons. The relation between TOC and fixed hydrocarbon indicates that these lignites are excellent source rock for hydrocarbon which could be obtained mainly through thermal cracking. The empirically derived values reveal a high conversion（94e96%） and high oil yield（64e66%） for these lignites.

关键词： Eocene lignites Cambay basin Rock-Eval Maceral Hydrocarbon

Rock fragmentation control in opencast blasting

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第2期8卷 225-237页

作者： p.k.singh M.p.Roy R.k.paswan Md.Sarim Suraj kumar Rakesh Ranjan Jha CSIR-Central Institute of Mining and Fuel Research

The blasting operation plays a pivotal role in the overall economics of opencast *** blasting subsystem affects all the other associated sub-systems,***,transport,crushing and milling *** control through effective blast design and its effect on productivity are the challenging tasks for practicing blasting engineer due to inadequate knowledge of actual explosive energy released in the borehole,varying initiation practice in blast design and its effect on explosive energy release *** paper describes the result of a systematic study on the impact of blast design parameters on rock fragmentation at three mines in *** mines use draglines and shoveledumper combination for removal of *** its pivotal role in controlling the overall economics of a mining operation,the expected blasting performance is often judged almost exclusively on the basis of poorly defined parameters such as powder factor and is often qualitative which results in very subjective assessment of blasting *** an approach is very poor substitutes for accurate assessment of explosive and blasting *** one blasts were conducted with varying blast designs and charging patterns,and their impacts on the rock fragmentation were documented.A high-speed camera was deployed to record the detonation sequences of the *** efficiency of the loading machines was also correlated with the mean fragment size obtained from the fragmentation analyses.

关键词： Opencast blast Rock fragmentation Explosives performance Dragline efficiency Fragment size

Analysis of groundwater level trend in Jakham River Basin of Southern Rajasthan

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Journal of Groundwater Science and Engineering 2022年第1期10卷 1-9页

作者： Vinay kumar Gautam Mahesh kothari p.k.singh S.R.Bhakar k.k.Yadav Department of Soil and Water Engineering CTAEMPUATUdaipur-313001(Raj.)India

Groundwater accounts for about half of the water use for irrigation in *** fluctuation pattern of the groundwater level is examined by observing rainfall replenishment and monitoring *** southern part of Rajasthan has experienced abrupt changes in rainfall and has been highly dependent on groundwater over *** study presents the impact of over-dependence on groundwater usage for irrigation and other purposes,spatially and ***,the objective of this study is to examine the groundwater level trend by using statistical analysis and geospatial *** factor was also studied in groundwater level fluctuation during *** analyze the influence of each well during recharge or withdrawal of groundwater,thiessien polygonswere generated from *** the Jakham River basin,75 wells have been identified for water level trend study using the Mann-kendall statistical *** statistics of trend analysis show that 15%wells are experiencing water level decline in pre-monsoon,while very low percentage of wells have such trend during post-monsoon *** average rate of water level decline is 0.245 m/a in pre-monsoon and 0.05 m/a in *** aquifer recharge potential is also decreasing by *** is expected that such type of studies will help the policy makers to adopt advanced management practices to ensure sustainable groundwater resource management.

关键词： Groundwater Trend analysis Rainfall kendal tau Slope p value Recharge pre-and postmonsoon

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分蜜的最佳用水量

甘蔗糖业 1981年第3期 51-52页

作者： p.k.singh 陈珮瑗

导言在制糖过程中加入的水量显著地加重了制炼间的蒸汽消耗。在制糖过程中水是在如下各阶段加入的: (a)压榨机的渗透水。 (b)过滤间用于洗涤滤饼的洗水。 (c)煮糖间用于稀释糖蜜和溶解伪晶的水。 (d)分蜜中用以除去粘附在蔗糖晶体上的... 详细信息

导言在制糖过程中加入的水量显著地加重了制炼间的蒸汽消耗。在制糖过程中水是在如下各阶段加入的: (a)压榨机的渗透水。 (b)过滤间用于洗涤滤饼的洗水。 (c)煮糖间用于稀释糖蜜和溶解伪晶的水。 (d)分蜜中用以除去粘附在蔗糖晶体上的糖蜜的用水。分蜜工段洗水是用于洗净附着在蔗糖晶体上的糖蜜。在计算最佳用水量时,假设用以除去粘附在蔗糖晶体上的糖蜜所需的水的体积等于粘附在蔗糖晶体上的糖蜜的体积。这就意味着加入水的体积应该等于粘附在蔗糖晶体上的糖蜜的体积。因此,对于制糖工作者来说,知道要除去糖蜜的体积是很重要的。这样,就可

关键词：分蜜丙糖粘附制糖用水量蔗糖晶体

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槟榔间作的成本和收益

世界热带农业信息 1988年第3期 17-19页

作者： p.k.singh 李爱英

本文对5种间作物(香蕉、蒌叶、生姜、菠萝和姜黄)的各项成本和利润进行估算。结果表明,蒌叶的家庭劳动力收入最高,依次是菠萝、香蕉、生姜和姜黄。

关键词：成本姜黄生姜萎叶菠萝香蕉财政管理姜黄属露兜子凤梨属芭蕉属收益家庭劳动力间作物

Virtual reality based apps are the future of patient:Counseling

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World Journal of Clinical Cases 2025年第6期13卷 58-60页

作者： Ranjan k Behera Arvind k Morya parul C Gupta Arshi singh Department of Ophthalmology MMIMSR Mullana AmbalaAmbala 133207HaryānaIndia Department of Ophthalmology All India Institute of Medical SciencesHyderabad 508126TelanganaIndia Department of Ophthalmology Post Graduate Institute of Medical Education and ResearchChandigarh 160012PunjabIndia Department of Ophthalmology Guru Nanak Eye CentreNew Delhi 110001New DelhiIndia

The use of virtual reality to educate preoperative patients has a positive impact on nurses as well as patients undergoing *** can help improve patient satisfaction and improve favorable outcomes by reducing patient anxiety and proving adequate knowledge about the procedure and possible outcomes to the *** also reduces burden on nursing staff and *** and more diverse cohort studies will help us understand the wider application of this tool on the patient *** may be difficult to apply this tool on elderly patients with failing eyesight,multiple physical ***,there may be reduced acceptance of this modality by older nursing staff and practitioners who may prefer the traditional verbal version for *** will benefit from a combined approach of using virtual reality apps with tradition one-on-one counselling to help alleviate patient concerns and improve patient and healthcare professional satisfaction.

关键词： Nurse patient Virtual reality Counselling Healthcare

prevalence of transfusion transmissible infections among various donor groups:A comparative analysis

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World Journal of Virology 2025年第1期14卷 108-117页

作者： Sanjay k Thakur Anil k Sinha Santosh k Sharma Aarzoo Jahan Dinesh k Negi Ruchika Gupta Sompal singh Regional Blood Transfusion Centre Hindu Rao Hospital and NDMC Medical CollegeNorth Delhi 110007DelhiIndia Department of Zoology Veer Kunwar Singh UniversityAra 802301BiharIndia Regional Blood Transfusion Centre and pathology Hindu Rao Hospital and NDMC Medical CollegeNorth Delhi 110007DelhiIndia Department of Cytopathology ICMR-National Institute of Cancer Prevention and ResearchNoida 201301Uttar PradeshIndia

BACkGROUND Transfusion transmissible infections(TTIs)are illnesses spread through contaminated blood or blood *** India,screening for TTIs such as hepatitis B virus(HBV),hepatitis C virus(HCV),human immunodeficiency virus(HIV)-I/II,malaria,and syphilis is mandatory before blood ***,HCV,HBV,and HIV are the leading viruses causing mortality,affecting millions of people globally,including those with co-infections of HIV/HCV and HIV/*** highlight the impact of TTIs on life expectancy and health risks,such as liver cirrhosis,cancer,and other diseases in individuals with chronic ***,millions of blood donations take place annually,emphasizing the importance of maintaining blood *** To study the prevalence of TTIs,viz.,HBV,HCV,HIV I/II,syphilis,and malaria parasite(Mp),among different blood donor *** The study assessed the prevalence of TTIs among different blood donor groups in Delhi,*** included total donors,in-house donors,total camp donors,institutional camp donors,and community camp *** for HIV,HBV,and HCV were done using enzyme-linked immunosorbent assay,while syphilis was tested with rapid plasma reagins and Mp rapid card *** prevalence of HBV,HCV,HIV,and syphilis,expressed as *** in infection rates between the groups were analyzed usingχ²tests and p-values(less than 0.05).RESULTS The study evaluated TTIs among 42158 blood donors in *** overall cumulative frequency of TTIs in total blood donors was 2.071%,and the frequencies of HBV,HCV,HIV-I/II,venereal disease research laboratory,and Mp were 1.048%,0.425%,0.221%,0.377%,and 0.0024%,***-house donors,representing 37656 donors,had the highest transfusion transmissible infection(TTI)prevalence at 2.167%.Among total camp donors(4502 donors),TTIs were identified in 1.266%of donors,while community camp donors(2439 donors)exhibited a prevalence of 1.558%.Institutional camp donors(2063 donors)had the l

关键词： Blood donors Transfusion transmissible infections Hepatitis B virus Human immunodeficiency virus Hepatitis C virus Malaria parasite Syphilis