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rock stress Around Noncircular Tunnel:a New SimpleMathematicalMethod

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Advances in Applied Mathematics and Mechanics 2017年第6期9卷 1330-1346页

作者： Wenlong Shen Xiangyu Wang Jianbiao Bai Wenfeng Li Yang Yu School of Energy Science and Engineering Henan Polytechnic UniversityJiaozuo 454000HenanChina State Key Laboratory of Coal Resources and Mine Safety China University of Mining&TechnologyXuzhou 221116JiangsuChina Mewbourne School of Petroleum and Geological Engineering University of OklahomaNormanOK 73019USA School of Civil Engineering Xuzhou Institute of TechnologyXuzhou 221008JiangsuChina

Anewsimplemathematicalmethod has been proposed to predict rock stress around a noncircular tunnel and themethod is calibrated and validatedwith a numerical model.It can be found that the tunnel shapes and polar angles affect the applicable zone of the theoretical model significantly and the applicable zone of a rectangular tunnel was obtained using this method.The method can be used to predict the values of the concentrated stress,and to analyze the change rate of rock stress and back to calculate the mechanical boundary condition in the applicable zone.The results of the stress change rate indicate that the horizontal stress is negatively related to the vertical boundary load and positively related to the horizontal boundary load.The vertical stress is negatively related to the horizontal boundary load and positively related to the vertical boundary load.These findings can be used to explain the evolution of the vertical increment in stress obtained with field-based borehole stress monitoring.

关键词： rock stress mathematical model noncircular tunnel applicable zone stress change rate numerical simulation

An Estimation Method of stress in Soft rock Based on In-situ Measured stress in Hard rock

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International Journal of Mining Science and Technology 2007年第3期17卷 310-315+320页

作者： LI Wen-ping,LI Xiao-qin,SUN Ru-hua School of Resources and Earth Science,China University of Mining & Technology,Xuzhou,Jiangsu 221008,China School of Resources and Earth Science China University of Mining & Technology Xuzhou Jiangsu 221008 China

The law of variation of deep rock stress in gravitational and tectonic stress fields is analyzed based on the Hoek-Brown strength criterion. In the gravitational stress field,the rocks in the shallow area are in an elastic state and the deep,relatively soft rock may be in a plastic state. However,in the tectonic stress field,the relatively soft rock in the shallow area is in a plastic state and the deep rock in an elastic state. A method is proposed to estimate stress values in coal and soft rock based on in-situ measurements of hard rock. Our estimation method relates to the type of stress field and stress state. The equations of rock stress in various stress states are presented for the elastic,plastic and critical states. The critical state is a special stress state,which indicates the conversion of the elastic to the plastic state in the gravitational stress field and the conversion of the plastic to the elastic state in the tectonic stress field. Two cases stud-ies show that the estimation method is feasible.

关键词： rock stress gravity stress tectonic stress critical depth estimation method

stress Evolution Law of Coal and rock Mass Affected by Mining before and after Dydraulic Fracturing

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Stress Evolution Law of Coal and Rock Mass Affected by Minin...

作者： Weizhong Chen Kun Zhong Wusheng Zhao Ziyi Xiao Hou Gao State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of Sciences Research Center of Geotechnical and Structural Engineering Shandong University University of Chinese Academy of sciences Bureau of Shandong Coal Mine Safety Supervision

stress concentration of coal and rock mass is the intrinsic cause of rock burst,the dynamic evolution law of coal seam stress and roof rock stress during the advancing process of mining face is obtained by using the coal seam stress monitoring system and the developed surrounding rock stress monitoring system,In this paper,the stress variation law of coal and rock mass during mining and the correlation between them are analyzed in detail.In order to reduce the danger of rock burst caused by stress concentration,hydraulic fracturing measures of roof strata were adopted in the field,and the stress changes of coal and rock mass before and after hydraulic fracturing were compared and analyzed.The results of the inspection show:The vertical stress gradient is linearly correlated with the trend of coal seam stress.The influence of mining on the stress of rock seam is earlier than that of coal seam,but the influence of mining disturbance on the stress of coal seam is higher than that of rock seam;The increase amplitude of vertical normal stress of roof strata under mining disturbance is obviously higher than that of two horizontal stresses;the stress value of coal and rock strata decreases after hydraulic fracturing,and the decrease amplitude of stress in coal seam is larger than that of rock strata after hydraulic fracturing.The peak stress of coal seam moves toward stopping line than that before hydraulic fracturing.Field application shows that the stress evolution information of coal seam can provide the corresponding basis for anti-scouring measures and ensure the safe and efficient production of working face.

关键词： stress control hydraulic fracturing rock stress coal seam stress rock burst

Heat-fluid-solid coupling mechanism of supercritical carbon dioxide jet in rock-breaking

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Petroleum Exploration and Development 2021年第6期48卷 1450-1461页

作者： LI Mukun WANG Gang CHENG Weimin PU Shijie NI Hongjian SHI Xian College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China No.1 Oil Production Plant Qinghai Oilfield CompanyPetroChinaQinghai 816499China School of Petroleum Engineering China University of Petroleum(East China)Qingdao 266580China

Aiming at the synergistic rock-breaking mechanism of supercritical carbon dioxide(SC-CO_(2))jet pressure and tem-perature difference,a heat-fluid-solid calculation model of rock-breaking stress was established and verified to be effective,and the variations of jet flow field and rock stress with jet standoff distance of SC-CO_(2),water and nitrogen were studied.With the increase of jet standoff distance,the jet pressure of SC-CO_(2) decreases and the jet temperature difference increases.The SC-CO_(2) jet is higher in pressure than the nitrogen jet and differs little from the water jet.Temperature difference of SC-CO_(2) jet is 5 times that of water jet and more than 2.5 ti mes that of nitrogen jet when the jet standoff distance is larger than 10.The tem-perature stress is the main reason why SC-CO_(2) jet is superior to water and nitrogen jets in rock-breaking.The rock under the SC-CO_(2) jet has greater rock stress,effective rock-breaking jet standoff distance and rock-breaking area.The jet pressure plays a major role in rock-breaking when the jet standoff distance is small,while the jet temperature difference plays a major role in rock-breaking when the jet standoff distance is large.The SC-CO_(2) jet is an efficient volume rock-breaking method,which results in tensile and shear failure on the rock surface under short time jet and large area tensile failure inside the rock simultaneously under long time jet.

关键词： supercritical carbon dioxide rock-breaking with jet rock stress jet pr essure jet temperature difference tem-perature stress heat-fluid-solid coupling

In situ rock stress-strength comparison:Posiva’s Olkiluoto Spalling Experiment（POSE）

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In situ rock stress-strength comparison:Posiva’s Olkiluoto ...

Harmonising rock Engineering and the Environment—12th ISRM International Congress on rock Mechanics

作者： K.Kemppainen M.Hakala E.Johansson H.Kuula J.A.Hudson Posiva Oy OlkiluotoFinland KMS Hakala Oy NokiaFinland Saanio & Riekkola Oy HelsinkiFinland WSP Finland Oy HelsinkiFinland Imperial College and rock Engineering Consultants LondonUK

＜正＞1 INTRODUCTION After the Finnish Government’s favourable policy decision in 2001,Posiva Oy has focused further investigations at the Olkiluoto site,western Finland and has started in 2004 the construction of an underground characterisation facility termed the ’ONKALO’.The ONKALO construction will be continued until 2012.The findings of the ONKALO will provide the knowledge needed for an application,supported by a Preliminary Safety Assessment,and to construct a final repository for spent nuclear fuel.Posiva will submit an application

关键词： nuclear repository site characterisation rock properties rock stress

Algorithm of coupled seepage and normal stress processes in fractured rock mass by composite element method

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Algorithm of coupled seepage and normal stress processes in ...

Harmonising rock Engineering and the Environment—12th ISRM International Congress on rock Mechanics

作者： I.Shahrour Laboratoire de Mechanique de Lille（UMR 8107） Universite des Sciences et Technologies de LilleFrance

＜正＞There is an important and complicated coupling between seepage and stress-strain fields in fractured rock mass:the stress-strain field is influenced by the seepage;however,the stress-strain field affects the permeability characteristics and in turn the seepage field as well.In the seepage and stress-strain coupling system,fractures play a fundamental role because the seepage and deformation of fractured rock mass are mainly dominated by them:stresses acting on the fracture surface lead to the change of fracture aperture,which causes the change of conductivity matrix of the fractured rock mass and the seepage field.According to this coupling mechanism, seepage and stress-strain coupling analysis of fractured rock mass can be achieved by applying the iterative algorithm. It is also widely recognized that in the geotechnical engineering, shear influence on fracture is less important than tension or compression influence（Zhang,2005;Raven ＆ Gale,1985;Tsang ＆ Witherspoon,1981）.

关键词： fluid flow rock stress hydraulic fractures rock mass

State of in-situ stress in different rocks

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Acta Seismologica Sinica(English Edition) 1994年第1期7卷 67-83页

作者：朱焕春陶振宇 Wuhan University of Hydraulic and Electric Engineering Wuhan China

According to the regression analysis of measured stress data in magmatite,sedimentary and metamorphic rock all over the world,it is found that the stress state in the three rocks is different and closely related to its formation.The relationships among the stress and depth and the Young's modulus of rock are also discussed and the results show that stress can increase with the Young's modulus.

关键词： lithology rock stress depth

Numerical anisotropic fracture mechanics modelling in crystalline rock

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Numerical anisotropic fracture mechanics modelling in crysta...

Harmonising rock Engineering and the Environment—12th ISRM International Congress on rock Mechanics

作者： T.Siren K.Kemppainen M.Rinne Posiva Oy EurajokiFinland Fracom Ltd KirkkonummiFinland

＜正＞1 INTRODUCTION 1.1 Fracture propagation code（FRACOD） Most numerical methods for rock engineering are based on methods that cannot genuinely describe the fracture initiation and propagation.Fracture propagation code（FRACOD） is a two-dimensional Displacement Discontinuity Method（DDM） computer code that was designed to simulate fracture initiation and propagation. The code development was started in early nineties by Shen ＆ Stephansson（1993）.The FRACOD code is based on

关键词： numerical modelling rock stress nuclear repository case studies

A discussion about boundary conditions in numerical simulation and its application in mining-induced rock mass movement

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A discussion about boundary conditions in numerical simulati...

中国科学院地质与地球物理研究所2012年度（第12届）...

作者： H.J.Zhao F.S.Ma Y.M.Zhang J.Guo A.H.Wei Key Laboratory of Engineering Geomechanics Institute of Geology and GeophysicsChinese Academy of Sciences

In numerical simulation of excavation in high tectonic stress field,the correctness of initial geo-stress field obtained by numerical simulation directly influences the final results.Based on a series of discussions,an improved effective method for back analysis of initial geo-stress was established and carried out by FLAC software.To study the special effects of high tectonic stress on excavating works,a typical mining-induced ground movement caused by underground mining in Jinchuan No.2 mine is obtained.The results indicated that the back analysis method can achieve reasonable and reliable initial geo-stress field.Because of different mechanisms of rock mass movement in high tectonic stress field,the mining-induced ground movement has distinctive characteristics compared with level coal mining.

关键词： numerical modeling rock stress mining rock mass