在大力发展新能源背景下,储能日益成为重要的战略手段。含水层压缩空气储能(compressed air energy storage in aquifers,简称CAESA)作为一种新型储能技术,因具有分布广、规模大等优势正受到关注,在勘探开发程度较高的油区含水层开展压...在大力发展新能源背景下,储能日益成为重要的战略手段。含水层压缩空气储能(compressed air energy storage in aquifers,简称CAESA)作为一种新型储能技术,因具有分布广、规模大等优势正受到关注,在勘探开发程度较高的油区含水层开展压缩空气储能具有更显著的优势。CAESA中,盖层系统的密封性控制着储库容量和安全性。充分挖掘盖层系统的封闭潜力需要依靠定量评价指标。针对该类工程特征,提出了一种最大封闭压力模型(P_(max))作为盖层(单元)封闭能力的定义,并通过数学建模给出了具体的确定方法。该模型可包容各类封闭机制,同时首次从数学物理上解释了盖层厚度的封闭机制。该指标可以作为选址阶段度量盖层封闭性的单一主控指标使用。以该指标为基础,结合系统的短板原理,定义了适用于整个盖层系统封闭性度量的盖层安全封闭压力指标Psafe,并给出了计算方法流程,可以在工程开发设计阶段采用。以中国石化胜利油田规划建设的KD642-7示范工程应用为例初步印证了该模型的合理性。展开更多
迹线是节理与岩体临空面相交形成的空间曲线,其几何形态直接反映岩体的结构特征。因此,快速准确地提取迹线信息具有重要的理论意义和工程价值。目前,基于空间点云数据的迹线提取多基于曲率开展,较少考虑点云的色彩信息,加之空间点云数...迹线是节理与岩体临空面相交形成的空间曲线,其几何形态直接反映岩体的结构特征。因此,快速准确地提取迹线信息具有重要的理论意义和工程价值。目前,基于空间点云数据的迹线提取多基于曲率开展,较少考虑点云的色彩信息,加之空间点云数量庞大,精度与效率均不理想。鉴于此,提出了一种新的基于降维投影的迹线提取方法(a new trace line extraction method based on dimensionality reduction projection,简称NTDR)。该方法将三维点云保形投影到二维平面,基于二维点云颜色信息进行高效边缘检测,结合三维点云的曲率及距离等几何特征进行聚类连线,实现了节理迹线的自动提取。研究表明:(1)相比于人工提取方法,NTDR处理大规模点云数据的时间节省了约91.07%,大幅提升了提取效率;(2)NTDR提取的迹线与人工提取相比,重合率达90.42%,且局部细节更多,在效果、精度上具有优越性;(3)NTDR在20%的噪点干扰下能保持80%以上的识别正确率,受噪点影响小;(4)相比于同类自动化迹线提取方法,NTDR在提取效果上有优势,更符合岩体实际的迹线分布情况。该方法可提升地质灾害预测效率,为隧道支护设计及工程安全评估提供数据支撑。展开更多
Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for q...Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for quantifying the stability of softhard interbedded anti-inclined slopes remain underdeveloped,primarily due to the complex force transfer mechanisms involved.This study proposed a novel theoretical model for the stability analysis of soft-hard interbedded anti-inclined slopes under rainfall conditions.The framework models stratified rock layers as layered cantilever beams with material heterogeneity.Based on the principle of deformation compatibility,it comprehensively accounted for interlayer force transfer and strength degradation resulting from differential deformations among rock layers.Furthermore,it integrated the critical instability length induced by the self-weight of rock layers to determine the fracture depth.The proposed method was validated against engineering case studies and physical model tests,with error falling within an acceptable range.Compared to existing theoretical methods,the proposed method provided a more realistic representation of the slope's stress field.The analysis results demonstrate that rainfall not only reduces the inclination angle of the failure surface but also leads to an approximate 30%decrease in the safety factor.The proposed theoretical model is particularly useful for quickly calculating the stability of soft-hard interbedded anti-inclined rock slope under rainfall conditions,compared to complex and time-consuming numerical simulation calculations.展开更多
The stability of rock slopes is frequently controlled by the initiation and propagation of inherent dominant cracks.This study systematically investigated these processes in valley slopes by combining fracture-mechani...The stability of rock slopes is frequently controlled by the initiation and propagation of inherent dominant cracks.This study systematically investigated these processes in valley slopes by combining fracture-mechanics analysis with transparent soil model tests.An analytical expression for the stress field at the dominant crack tip was derived from the slope stress distribution by superposing the corresponding stress intensity factors(SIFs).The theoretical predictions were then validated against observations from transparent soil model tests.The influences of slope angle(β),crack inclination angle(α),crack position parameter(b),and crack length parameter(h)on crack initiation and propagation were quantified.The results indicated that:(1)cracks at the slope crest tended to propagate in shear mode,and the shear crack initiation angle(θ_(s))was approximately 8°.Cracks at the slope toe might propagate in either tensile or shear mode.(2)θ_(s) at the slope crest increased withβ,b,and l,and decreased withα.The maximum change inθ_(s) induced by the considered parameters was approximately 30°.(3)The tensile crack initiation angle(θ_(t))at the slop toe decreased withβ,α,and l,while the influence of b was comparatively minor.The maximum change inθ_(t) caused by individual parameters ranged approximately from 25°to 60°.Predicted crack propagation modes and directions showed good agreement with experimental results.These findings provide theoretical guidance for stability assessments of valley slopes controlled by dominant crack propagation.展开更多
文摘在大力发展新能源背景下,储能日益成为重要的战略手段。含水层压缩空气储能(compressed air energy storage in aquifers,简称CAESA)作为一种新型储能技术,因具有分布广、规模大等优势正受到关注,在勘探开发程度较高的油区含水层开展压缩空气储能具有更显著的优势。CAESA中,盖层系统的密封性控制着储库容量和安全性。充分挖掘盖层系统的封闭潜力需要依靠定量评价指标。针对该类工程特征,提出了一种最大封闭压力模型(P_(max))作为盖层(单元)封闭能力的定义,并通过数学建模给出了具体的确定方法。该模型可包容各类封闭机制,同时首次从数学物理上解释了盖层厚度的封闭机制。该指标可以作为选址阶段度量盖层封闭性的单一主控指标使用。以该指标为基础,结合系统的短板原理,定义了适用于整个盖层系统封闭性度量的盖层安全封闭压力指标Psafe,并给出了计算方法流程,可以在工程开发设计阶段采用。以中国石化胜利油田规划建设的KD642-7示范工程应用为例初步印证了该模型的合理性。
文摘迹线是节理与岩体临空面相交形成的空间曲线,其几何形态直接反映岩体的结构特征。因此,快速准确地提取迹线信息具有重要的理论意义和工程价值。目前,基于空间点云数据的迹线提取多基于曲率开展,较少考虑点云的色彩信息,加之空间点云数量庞大,精度与效率均不理想。鉴于此,提出了一种新的基于降维投影的迹线提取方法(a new trace line extraction method based on dimensionality reduction projection,简称NTDR)。该方法将三维点云保形投影到二维平面,基于二维点云颜色信息进行高效边缘检测,结合三维点云的曲率及距离等几何特征进行聚类连线,实现了节理迹线的自动提取。研究表明:(1)相比于人工提取方法,NTDR处理大规模点云数据的时间节省了约91.07%,大幅提升了提取效率;(2)NTDR提取的迹线与人工提取相比,重合率达90.42%,且局部细节更多,在效果、精度上具有优越性;(3)NTDR在20%的噪点干扰下能保持80%以上的识别正确率,受噪点影响小;(4)相比于同类自动化迹线提取方法,NTDR在提取效果上有优势,更符合岩体实际的迹线分布情况。该方法可提升地质灾害预测效率,为隧道支护设计及工程安全评估提供数据支撑。
基金supported by the Chongqing Water Conservancy Science and Technology Project(grant number:CQSLK-202329)the Natural Science Foundation of Chongqing,China(grant number:CSTB2022NSCQ-MSX0991)+1 种基金the National Natural Science Foundation of China(grant number:52378327)the Chongqing Natural Science Foundation Innovation Development Joint Fund(grant number:CSTB2022NSCQ-LZX0049)。
文摘Rock slope instability is a prevalent geological hazard that imposes significant adverse impacts on engineering activities.Although existing studies have focused on homogeneous rock slopes,the theoretical models for quantifying the stability of softhard interbedded anti-inclined slopes remain underdeveloped,primarily due to the complex force transfer mechanisms involved.This study proposed a novel theoretical model for the stability analysis of soft-hard interbedded anti-inclined slopes under rainfall conditions.The framework models stratified rock layers as layered cantilever beams with material heterogeneity.Based on the principle of deformation compatibility,it comprehensively accounted for interlayer force transfer and strength degradation resulting from differential deformations among rock layers.Furthermore,it integrated the critical instability length induced by the self-weight of rock layers to determine the fracture depth.The proposed method was validated against engineering case studies and physical model tests,with error falling within an acceptable range.Compared to existing theoretical methods,the proposed method provided a more realistic representation of the slope's stress field.The analysis results demonstrate that rainfall not only reduces the inclination angle of the failure surface but also leads to an approximate 30%decrease in the safety factor.The proposed theoretical model is particularly useful for quickly calculating the stability of soft-hard interbedded anti-inclined rock slope under rainfall conditions,compared to complex and time-consuming numerical simulation calculations.
基金financially supported by the National Nature Science Foundation of China(Nos.52379110 and 42207222)the Key Technologies for Accurate Diagnosis and Intelligent Prevention and Control of Slope Hazards in Open Pit Mines,181 Major R&D projects of Metallurgical Corporation of China Ltd。
文摘The stability of rock slopes is frequently controlled by the initiation and propagation of inherent dominant cracks.This study systematically investigated these processes in valley slopes by combining fracture-mechanics analysis with transparent soil model tests.An analytical expression for the stress field at the dominant crack tip was derived from the slope stress distribution by superposing the corresponding stress intensity factors(SIFs).The theoretical predictions were then validated against observations from transparent soil model tests.The influences of slope angle(β),crack inclination angle(α),crack position parameter(b),and crack length parameter(h)on crack initiation and propagation were quantified.The results indicated that:(1)cracks at the slope crest tended to propagate in shear mode,and the shear crack initiation angle(θ_(s))was approximately 8°.Cracks at the slope toe might propagate in either tensile or shear mode.(2)θ_(s) at the slope crest increased withβ,b,and l,and decreased withα.The maximum change inθ_(s) induced by the considered parameters was approximately 30°.(3)The tensile crack initiation angle(θ_(t))at the slop toe decreased withβ,α,and l,while the influence of b was comparatively minor.The maximum change inθ_(t) caused by individual parameters ranged approximately from 25°to 60°.Predicted crack propagation modes and directions showed good agreement with experimental results.These findings provide theoretical guidance for stability assessments of valley slopes controlled by dominant crack propagation.
