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Strength prediction model for water-bearing sandstone based on nearinfrared spectroscopy

山地科学学报(英文) 2023年第8期20卷 2388-2404页

作者： ZHANG Xiu-lian ZHANG Fang WANG Ya-zhe TAO Zhi-gang ZHANG Xiao-yun State key laboratory for Geomechanics and Deep Underground Engineering Beijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards of Zhejiang Province Shaoxing UniversityShaoxing 312000China Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province Shaoxing UniversityShaoxing 312000China

The strength of water-bearing rock cannot be obtained in real time and by nondestructive experiments,which is an issue at cultural relics protection sites such as grotto *** solve this problem,we conducted a near-infrared spectrum acquisition experiment in the field and laboratory uniaxial compression strength tests on sandstone that had different water saturation *** correlations between the peak height and peak area of the nearinfrared absorption bands of the water-bearing sandstone and uniaxial compressive strength were *** this basis,a strength prediction model for water-bearing sandstone was established using the long short-term memory full convolutional network(LSTM-FCN)***,a field engineering test was carried *** results showed that:(1)The sandstone samples had four distinct characteristic absorption peaks at 1400,1900,2200,and 2325 *** peak height and peak area of the absorption bands near 1400 nm and 1900 nm had a negative correlation with uniaxial compressive *** peak height and peak area of the absorption bands near 2200 nm and 2325 nm had nonlinear positive correlations with uniaxial compressive strength.(2)The LSTM-FCN method was used to establish a strength prediction model for water-bearing sandstone based on near-infrared spectroscopy,and the model achieved an accuracy of up to 97.52%.(3)The prediction model was used to realize non-destructive,quantitative,and real-time determination of uniaxial compressive strength;this represents a new method for the non-destructive testing of grotto rock mass at sites of cultural relics protection.

关键词： Water-bearing sandstone Near-infrared spectroscopy saturation degree Uniaxial compressive strength Prediction model Dazu Rock Carvings

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Simulation of coupled flowing-reaction-deformation with mass transfer in heap leaching processes

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Applied Mathematics and Mechanics(English Edition) 2007年第3期28卷 327-335页

作者：吴爱祥刘金枝唐玲艳 School of Civil and Environment Engineering University of Science and Technology Beijing School of Mathematical Sciences and Computing Technology Central South University Department of Mathematics and System Science National University of Defense Technology

Governing equations for a fully coupled flowing-reaction-deformation behavior with mass transfer in heap leaching are developed. The model equations are solved using an explicit finite difference method under the conditions of invariable application rate and constant hydraulic head. The distribution of the degree of the saturation, as well as the distributions of the concentration of the reagent and the solute is given. A cubic relationship between the mineral recovery and the leaching duration is obtained based on the numerical results. The relationship can be used to predict the recovery percentage of the valuable metal.

关键词： heap leaching porosity evolution model saturation degree mass transfer numerical solution

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Influential factors of loess liquefaction and pore pressure development

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Acta Mechanica Sinica 2005年第2期21卷 129-132页

作者： ChenggangZhao ZhenmaoYang FupingGao YunaZhang SchoolofCivilEngineering BeijingJiaotongUniversityBeijing100044China InstituteofMechanics ChineseAcademyofSciencesBeijing100080China

The liquefaction of loess under dynamic loading is studied experimentally with a dynamic triaxial test system. The effects of over-consolidation ratio (OCR), saturation degree and the frequency of dynamic loading upon loess liquefaction are investigated. The development of pore pressure within loess samples is also discussed. Based on the experimental results, the empirical relationship between pore pressure ratio and loading cycle number ratio is established for normal consolidated saturated loess.

关键词： Loess liquefaction Over-consolidation ratio Loading frequency saturation degree Pore pressure

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How rock samples can be representative of in situ condition:A case study of Callovo-Oxfordian claystones

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第4期10卷 613-623页

作者： N.Conil J.Talandier H.Djizanne R.de La Vaissière C.Righini-Waz C.Auvray C.Morlot G.Armand Andra URL BureFrance Andra Chatenay-MalabryFrance Universitéde Lorraine GéoRessources Vandoeuvre-les-NancyFrance

Within the framework of feasibility studies for a reversible, deep geological repository of high-and intermediate-level long-lived radioactive waste(HLW, IL-LLW), the French National Radioactive Waste Management Agency(Andra) is investigating the Callovo-Oxfordian(COx) formation near Bure(northeast part of France) as a potential host rock for the repository. The hydro-mechanical(HM) behaviour is an important issue to design and optimise different components of the disposal such as shaft, ramp, drift,and waste package disposal facilities. Over the past 20 years, a large number of laboratory experiments have been carried out to characterise and understand the HM behaviours of COx claystones. At the beginning, samples came from deep boreholes drilled at the ground surface with oil base mud. From2000 onwards, with the launch of the construction of the Meuse/Haute-Marne Underground Research Laboratory(MHM URL), most samples have been extracted from a large number of air drilled boreholes in the URL. In parallel, various constitutive models have been developed for modelling. The thermohydro-mechanical(THM) behaviours of the COx claystones were investigated under different repository conditions. Core samples are subjected to a complex HM loading path before testing, due to drilling, conditioning and preparation. Various kinds of effects on the characteristics of the claystones are highlighted and discussed, and the procedures for core extraction and packaging as well as a systematic sample preparation protocol are proposed in order to minimise the uncertainties on test results. The representativeness of the test results is also addressed with regard to the in situ rock mass.

关键词： Callovo-Oxfordian (COx) claystone samples Physical properties In situ condition saturation degree Resaturation process Experimental protocol

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