基于Slide的研山铁矿高陡边坡稳定性分析

露天矿山边坡稳定性对采场安全生产至关重要。为探究边坡施工过程中的安全隐患,以研山铁矿高陡边坡为研究对象,考虑爆破震动及地震作用荷载,运用Slide二维边坡数值模拟软件对典型剖面进行稳定性计算。结果表明:在正常工况条件、爆破震动及地震作用下,边坡整体安全系数符合要求,整体处于稳定状态。但在爆破震动及地震作用下,边坡局部安全系数介于临界值,可能存在局部滑坡风险。为保证采场生产安全,提出了相应的边坡管理预防措施,为相关实践工作提供一定参考。

Predicting impact forces on pipelines from deep-sea fluidized slides:A comprehensive review of key factors

Deep-sea pipelines play a pivotal role in seabed mineral resource development,global energy and resource supply provision,network communication,and environmental protection.However,the placement of these pipelines on the seabed surface exposes them to potential risks arising from the complex deep-sea hydrodynamic and geological environment,particularly submarine slides.Historical incidents have highlighted the substantial damage to pipelines due to slides.Specifically,deep-sea fluidized slides(in a debris/mud flow or turbidity current physical state),characterized by high speed,pose a significant threat.Accurately assessing the impact forces exerted on pipelines by fluidized submarine slides is crucial for ensuring pipeline safety.This study aimed to provide a comprehensive overview of recent advancements in understanding pipeline impact forces caused by fluidized deep-sea slides,thereby identifying key factors and corresponding mechanisms that influence pipeline impact forces.These factors include the velocity,density,and shear behavior of deep-sea fluidized slides,as well as the geometry,stiffness,self-weight,and mechanical model of pipelines.Additionally,the interface contact conditions and spatial relations were examined within the context of deep-sea slides and their interactions with pipelines.Building upon a thorough review of these achievements,future directions were proposed for assessing and characterizing the key factors affecting slide impact loading on pipelines.A comprehensive understanding of these results is essential for the sustainable development of deep-sea pipeline projects associated with seabed resource development and the implementation of disaster prevention measures.

Adaptive Trajectory Tracking Control for Nonholonomic Wheeled Mobile Robots:A Barrier Function Sliding Mode Approach

The trajectory tracking control performance of nonholonomic wheeled mobile robots(NWMRs)is subject to nonholonomic constraints,system uncertainties,and external disturbances.This paper proposes a barrier function-based adaptive sliding mode control(BFASMC)method to provide high-precision,fast-response performance and robustness for NWMRs.Compared with the conventional adaptive sliding mode control,the proposed control strategy can guarantee that the sliding mode variables converge to a predefined neighborhood of origin with a predefined reaching time independent of the prior knowledge of the uncertainties and disturbances bounds.Another advantage of the proposed algorithm is that the control gains can be adaptively adjusted to follow the disturbances amplitudes thanks to the barrier function.The benefit is that the overestimation of control gain can be eliminated,resulting in chattering reduction.Moreover,a modified barrier function-like control gain is employed to prevent the input saturation problem due to the physical limit of the actuator.The stability analysis and comparative experiments demonstrate that the proposed BFASMC can ensure the prespecified convergence performance of the NWMR system output variables and strong robustness against uncertainties/disturbances.

基于Slide2的某铁矿尾矿库坝体稳定性分析

尾矿库是冶金矿山的重要附属设施,一旦失事将造成严重的环境污染和重大损失,尾矿库安全的核心在于尾矿坝是否稳定。通过采用Slide2软件,根据岩土工程勘察资料,建立山西某铁矿尾矿库坝体典型剖面的二维数值模型,对坝体三种运行工况下的渗流稳定性和坝坡稳定性进行分析,以确定尾矿库的安全性,并分析Slide2软件应用于尾矿坝稳定性分析中的可靠性和功能性。

支气管镜在儿童Slide气管成形术中的应用

目的 总结支气管镜在儿童Slide气管成形术中的作用。方法 回顾性分析2017—2020年湖南省人民医院收治的4例气管狭窄患儿的诊疗经过,总结支气管镜在Slide气管成形术术前评估、术中定位与测量及术后创面评估和治疗中的作用。结果 Slide气管成形术术前支气管镜评估显示,4例患儿中3例存在完全气管环,2例合并肺动脉吊带,2例存在多处狭窄。3例在该院完成Slide气管成形术,术中支气管镜下判断狭窄段中点及测量狭窄段长度,协助离断气管狭窄段,术后灌洗明确病原;1例外院Slide气管成形术术后9个月出现瘢痕牵拉,经支气管镜下介入治疗好转。2例术后第4天支气管镜下发现气管黏膜改变,调整治疗方案;2例术后1个月出现肉芽增生,经支气管镜下冷冻治疗好转。1例因吻合口坏死放弃治疗死亡,存活的3例随访6个月以上,预后可,但均存在气管支气管软化。结论 支气管镜可用于气管狭窄患儿Slide气管成形术的管理,有助于术后康复及随访。

Anchoring Depth Research of Anti-Slide Piles of Anchor Bar in Soil

The model test result of earth force in the side of anti-slide pile of anchor bars was introduced.There are three groups of the tests.The loads were on the back side of the slope in two groups.The other one was loaded just behind the pile by the jack.In order to get the force of the soil,some earth-pressure boxes were used to get the earth pressure on the side of the piles.The part of the max pressure and the earth pressure was mainly focused under the slip line

A failure criterion for shale considering the anisotropy and hydration based on the shear slide failure model

A failure criterion fully considering the anisotropy and hydration of shale is essential for shale formation stability evaluation.Thus,a novel failure criterion for hydration shale is developed by using Jaeger’s shear failure criterion to describe the anisotropy and using the shear strength reduction caused by clay minerals hydration to evaluate the hydration.This failure criterion is defined with four parameters in Jaeger’s shear failure criterion(S_(1),S_(2),a andφ),three hydration parameters(k,ω_(sh)andσ_(s))and two material size parameters(d and l0).The physical meanings and determining procedures of these parameters are described.The accuracy and applicability of this failure criterion are examined using the published experimental data,showing a cohesive agreement between the predicted values and the testing results,R^(2)=0.916 and AAREP(average absolute relative error percentage)of 9.260%.The error(|D_(p)|)is then discussed considering the effects ofβ(angle between bedding plane versus axial loading),moisture content and confining pressure,presenting that|Dp|increases whenβis closer to 30°,and|D_(p)|decreases with decreasing moisture content and with increasing confining pressure.Moreover,|D_(p)|is demonstrated as being sensitive to S1and being steady with decrease in the data set whenβis 0°,30°,45°and 90°.

2例肺动脉气管换位联合Slide重建术患儿的术后护理

目的探讨肺动脉气管换位联合Slide重建术患儿的术后护理要点。方法总结2020—2021年浙江大学医学院附属儿童医院收治2例肺动脉吊带合并气管支气管狭窄行肺动脉气管换位联合Slide重建术患儿的术后护理,对2例患儿进行多项针对性护理措施以预防并发症的发生,通过纤维支气管镜检查,及时发现气道并发症;术后密切观察有无气管吻合口瘘;做好呼吸道管理,预防呼吸道阻塞;加强术后营养支持,促进患儿术后康复。结果经过精心治疗和护理,2例患儿恢复良好,分别于入院第64天和第28天康复出院。随访1~6个月,通过复查心脏B超和纤维支气管镜检查,患儿未见明显异常。结论肺动脉气管换位联合Slide重建术后密切关注患儿的吻合口和呼吸道是护理重点,饮食护理在康复过程中起到重要作用。

基于Slide的水电站高边坡稳定性分析及支护方案研究

基于Slide软件,采用极限平衡法计算某水电站边坡在正常运行及降雨工况下的稳定性,同时研究了回填石渣和增设土钉处理2种支护方案的实施效果。结果表明,该处边坡在正常运用及降雨工况的安全系数均小于规范要求的下限值,不满足规范要求,需采取一定措施进行支护。为增加边坡的稳定性,采用回填石渣和增设土钉处理2种支护方案,加固后的边坡的稳定性均满足规范要求。

基于SLIDE软件矿山边坡稳定性分析的研究

本文通过介绍对绍兴县毛婆溪石材矿现状边坡的稳定性研究的内容,揭示中仿Slide 6.0边坡分析软件在矿山边坡分析中的应用方法。中仿Slide 6.0边坡分析软件能直接显示边坡安全系数的计算结果,但在不同的工况下或者使用不同的分析方法会得到不同的计算结果。本文所使用的方法对其他同类矿山具有一定参考意义。

Revised barrier function-based adaptive finite-and fixed-time convergence super-twisting control

This paper presents an adaptive gain,finite-and fixedtime convergence super-twisting-like algorithm based on a revised barrier function,which is robust to perturbations with unknown bounds.It is shown that this algorithm can ensure a finite-and fixed-time convergence of the sliding variable to the equilibrium,no matter what the initial conditions of the system states are,and maintain it there in a predefined vicinity of the origin without violation.Also,the proposed method avoids the problem of overestimation of the control gain that exists in the current fixed-time adaptive control.Moreover,it shows that the revised barrier function can effectively reduce the computation load by obviating the need of increasing the magnitude of sampling step compared with the conventional barrier function.This feature will be beneficial when the algorithm is implemented in practice.After that,the estimation of the fixed convergence time of the proposed method is derived and the impractical requirement of the preceding fixed-time adaptive control that the adaptive gains must be large enough to engender the sliding mode at time t=0 is discarded.Finally,the outperformance of the proposed method over the existing counterpart method is demonstrated with a numerical simulation.

Investigation of groundwater characteristics and its influence on Landslides in Heifangtai Plateau using comprehensive geophysical methods

The occurrence of landslides in Heifangtai plateau is primarily caused by the rise in water levels due to irrigation. To accurately understand the distribution of groundwater and its impact on the landslide hazard, a combination of Electrical Resistivity Tomography(ERT), Induced Polarization(IP) and Surface Nuclear Magnetic Resonance(SNMR) methods were used in this study. By conducting a comprehensive analysis, the characteristics of water-bearing structure in vertical and groundwater distribution in horizontal were detected;and the influence of the groundwater on plateau and landslides was also identified. The results indicate that the groundwater occurs in the loess aquifer with a three-layer structure in vertical.Horizontally, the aquifer has a unified water table over the plateau, with a low water level in the north and high one in the south. The high resistivity bedrock uplift belt in the middle of the plateau forms a watershed,with the north side of the uplift belt being a relatively stable slope area with stable water content and fewer geological disasters. In contrast, the south side of the uplift belt is a disaster-prone region with vertical fissures well developed in the loess aquifers. The southern landslides are characterized by the interphase distribution of high and low electrical resistivity. The infiltration and discharge of groundwater result in the formation of a collapse belt in the low resistivity water-bearing structure of landslide, which causes the entire block with high resistivity and stable bedrock to slide. There was a newly formed landslide in a larger range at the landslide' s trailing edge. This study provides a scientific basis for the study of landslides mechanisms and disaster prevention by identifying the distribution characteristics of groundwater and analyzing its influence from a geophysical perspective in Heifangtai.

HIL testing of wheel slide protection systems:criteria for continuous updating and validation

Assessment of railway wheel slide protection(WSP) systems involves the execution of complex experimental activities that are quite expensive and time-consuming, since they involve the physical reproduction of degraded adhesion conditions on a real railway line. WSP is devoted to regulating applied braking forces to avoid excessive wheel sliding in case of degraded adhesion conditions between wheel and rail. WSP must be also compliant to safety specifications related to assured braking performances and consumed air. Hardware in the loop(HIL) testing offers an affordable and sustainable way to accelerate these activities optimizing cost, duration and safety of experimental activities performed online. HIL test rigs are subjected to continuous updates, customization and natural ageing of their components. This work investigates the criteria that can be adopted to assure a continuous monitoring and validation of a real WSP test rig, the Italian test rig of Firenze Osmannoro.

过去十年美国学校图书馆员情况研究——基于SLIDE项目报告的分析

基于网络调查法和内容分析法,论文通过分析SLIDE项目发布的报告,确定过去十年美国学校图书馆员的情况,即馆员建设专业化与职业化水平比较高,全国馆员人数大幅减少,馆员数量不能满足教与学需求,馆员数量在各州层面和各学区层面配置不均衡,希望美国的经验和教训能为我国中小学图书馆员队伍建设和人才培养提供借鉴。

基于Slide法的磨坊露天磷矿边坡稳定性分析

针对磨矿露天磷矿特有的工程地质特征,选取了2个典型的最危险盘边坡剖面,运用Slide边坡分析软件进行稳定性计算分析。计算结果表明:设计的边坡稳定性良好,安全系数满足安全系数限制的要求。该结果验证了施工图阶段所设计的边坡参数能够满足现场实际的技术标准和生产需要,该结论对磨坊露天磷矿安全生产作业具有重大的指导作用。

基于Slide的水电站边坡多工况稳定性分析

某水电站边坡工程规模大,工程技术条件复杂,自然谷坡高陡,岩性多样,并发育有断层等,场地地质条件复杂,工程边坡的安全稳定性问题十分突出。选取安全稳定问题最为突出的溢洪道进口及泄洪放空洞出口边坡典型剖面,基于Slide软件,采用极限平衡法计算边坡在正常运行、降雨及地震3种工况下的稳定性。结果表明,溢洪道进口及泄洪放空洞出口边坡安全系数均大于规范允许的安全系数,该水电站边坡稳定性满足要求。

基于Slide的Webdav服务器的设计与实现

描述了一个支持Webdav协议的文档管理系统，它以Apache的Jakarta项目组中的Slide模块为实现基础，任何支持Webdav协议的客户端都可以方便地使用该系统。

SLIDE在深基坑支护可靠性分析中的应用

基于可靠性分析理论,利用SLIDE软件,对某深基坑复合土钉支护进行了数值模拟,计算了安全系数和可靠性指标。结果表明:SLIDE是基坑可靠性分析的一种有效工具,可在考虑土层参数不确定性的条件下,得出基坑支护的可靠性指标。

基于Slide的某钨矿尾矿坝稳定性及概率分析

尾矿坝的稳定运行是钨矿山安全生产的重要保障。研究结合某钨矿尾矿库的工程地质特征,采用Slide软件建立坝体的概化模型,通过Bishop法计算尾矿坝在正常、洪水及特殊三种工况下的稳定性,结合瑞典条分法对坝体的抗滑稳定最小安全系数进行校核。同时运用概率分析法,对安全系数在服从正态分布及对数正态分布下开展可靠性指数的计算,并得出坝体的失效概率。综合分析坝体的稳定性和概率分析的结果,认为该尾矿坝在三种工况下能正常运行但存在洪水漫顶和地震液化的隐患,并针对隐患提出相应的整改建议。

Slide软件在边坡稳定性计算中的应用

介绍了一款新的边坡稳定性计算的专业软件Slide,并结合某桥梁的工程实例,运用Slide软件进行建模和计算分析。