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Model Test Study on Response of Weathered Rock Slope to Rainfall Infiltration under Different Conditions

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Journal of Earth Science 2024年第4期35卷 1316-1333页

作者： Cong Li Rongtang Zhang jiebing Zhu Bo Lu Xiaowei wang Fangling Xu Xiaoke Shen Jiesheng Liu Weizhen Cai School of Civil Engineering and Architecture Wuhan Polytechnic UniversityWuhan430023China Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Yangtze River Scientific Research InstituteWuhan430010China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing210098China

Weathered rock(especially granite)slopes are prone to failure under the action of rainfall,making it necessary to study the response of weathered rock slope to rainfall infiltration for landslide *** this study,a series of model tests of weathered rock slope under different conditions were *** matric suction,volumetric water content,earth pressure and deformation of slope were monitored in real time during *** response of the slope to rainfall infiltration,failure process and failure mode of slope under different conditions were analyzed,and the early warning criterion for the failure of weathered rock slope caused by rainfall was *** results show that the slope deformation evolution process under rainfall condition was closely related to the dissipation of matric *** the distribution of the matrix suction(or water content)of slope met the condition that the resistance to sliding of the slip-mass was overcome,the displacement increased sharply and landslide *** factors including rainfall process,lithologic condition and excavation condition significantly affect the response of weathered rock slope to *** can be found from the test results under different conditions that compared with intermittent rainfall condition,the rainfall intensity and infiltration depth were smaller when the slope entering accelerated deformation stage under the condition of incremental *** accumulated rainfall when weathered clastic landslide occurring was greater than that of weathered granite,which results in greater disaster *** excavation angle and moisture distribution of a slope were the main factors affecting the stability of a *** addition,the evolution processes and critical displacement velocities of slopes were studied by combining the deformation curves and matrix suction curves,which can be used as reference for early warning of rainfall-induced weathered rock landslide.

关键词： weathered rock slope model test rainfall early warning unsaturated soil

重庆丘陵山区耕地非粮化时空变异及驱动类型划分

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农业资源与环境学报 2024年第1期41卷 15-26页

作者：谢雨琦王子芳王颖郑杰炳向书江高明西南大学资源环境学院重庆400715 重庆市规划与自然资源局重庆404599 重庆地质矿产研究院重庆401120

为厘清中国西南典型丘陵山区的耕地非粮化态势和提供有针对性的管控措施,以重庆市为研究区域,基于空间自相关方法、地理探测器、主成分分析和K均值聚类等方法探究重庆市耕地非粮化驱动因素,并划分驱动类型。结果表明:2011—2020年,重庆... 详细信息

为厘清中国西南典型丘陵山区的耕地非粮化态势和提供有针对性的管控措施,以重庆市为研究区域,基于空间自相关方法、地理探测器、主成分分析和K均值聚类等方法探究重庆市耕地非粮化驱动因素,并划分驱动类型。结果表明:2011—2020年,重庆市耕地非粮化率由37.51%上升至42.87%,中度非粮化和高度非粮化区县共增加了14个;空间聚集程度加深,高高集聚区和低高集聚区主要分布在中心城区。城乡居民人均可支配收入差距、城镇化率、各区县距中心城区距离是耕地“非粮化”主要的驱动因子,各因子交互作用以非线性增强为主,各区县距中心城区距离与城乡居民可支配收入差距两因子交互对非粮化空间格局的解释力最强。重庆市非粮化驱动类型可以分为农业生产支持型、区位经济引导型、农业生产弱化型三类,且分区结果与重庆市“一区两群”规划一致。研究结果可为重庆市耕地非粮化分区管控政策制定提供依据,同时为其他山地、丘陵地区提供借鉴。

关键词：耕地非粮化空间自相关地理探测器分区管理重庆市

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高品质住宅地下建筑防潮问题的防治措施

建设科技 2024年第9期 37-41,45页

作者：王丽林丽陈雯单洁冰烟台市建筑设计研究股份有限公司烟台264003

夏季潮湿地区的地下建筑普遍存在墙体内表面结露、长毛发霉和地面潮湿等现象,如果长期处于潮湿的环境中,会相应缩短建筑物及其存放物的使用寿命,且滋生霉菌危害人体健康。因而地下建筑长毛发霉积水的问题亟待改善和解决。本工作通过对... 详细信息

夏季潮湿地区的地下建筑普遍存在墙体内表面结露、长毛发霉和地面潮湿等现象,如果长期处于潮湿的环境中,会相应缩短建筑物及其存放物的使用寿命,且滋生霉菌危害人体健康。因而地下建筑长毛发霉积水的问题亟待改善和解决。本工作通过对地下建筑墙体内表面结露、长毛发霉和地面潮湿等现象的产生机理分析,建立了地下建筑围护结构的数学模型,通过分析影响围护结构导热量的关键因素并对比改善方案,提出了一种基于提高地下建筑墙体内表面温度的防治措施,避免了出现夏季结露引起潮湿长毛的现象。本研究成果可为现有地下建筑防结露改造等工程实施提供技术指导,同时也可为新建建筑的防结露围护结构研究提供理论参考。

关键词：地下建筑防结露围护结构模型机理分析防治措施

TBM隧道岩石可掘性评价指标及其应用研究综述

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地下空间与工程学报 2024年第S01期20卷 508-520页

作者：李子琛朱杰兵张宜虎汪斌徐栋栋长江水利委员会长江科学院水利部岩土力学与工程重点实验室武汉430010

TBM(Tunnel Boring Machine)掘进施工成本中,刀具的磨损占比很高,这通常是由于TBM的刀具设计与岩石强度及硬度不匹配。因此需要对TBM隧道岩石进行可掘性评估,为刀具设计及施工参数确定提供依据。岩石可掘性评价在TBM围岩分级、掘进效率... 详细信息

TBM(Tunnel Boring Machine)掘进施工成本中,刀具的磨损占比很高,这通常是由于TBM的刀具设计与岩石强度及硬度不匹配。因此需要对TBM隧道岩石进行可掘性评估,为刀具设计及施工参数确定提供依据。岩石可掘性评价在TBM围岩分级、掘进效率预测等方面十分重要,是评估TBM施工效率与成本的关键,但隧道TBM开挖过程中岩石可掘性的评价通常相当复杂,需要考虑许多参数,且至今国内外对可掘性这一指标尚未有标准化定义。通过文献检索,本文针对可掘性指标的定义,可掘性的研究应用等方面研究进展进行综述。结合已有的研究成果,对TBM可掘性未来的研究方向进行了展望。

关键词：全断面隧道掘进机可掘性指标 TBM围岩分级预测模型

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大口径球面镜透过率测量系统控制技术

激光与光电子学进展 2024年第17期61卷 198-205页

作者：王佳豪于信白素平韩佳昊王杏月贺国强韩洁冰长春理工大学光电工程学院

由于高能激光系统中光学元件对于系统探测距离、毁伤能力以及能量损耗程度等参数都可以通过测量透过率来评估，采用共光路复合位移同步扫描技术，通过逐点扫描的方式实现对大口径元件透过率的测量。通过扫描圆周和径向的复合位移，控制... 详细信息

由于高能激光系统中光学元件对于系统探测距离、毁伤能力以及能量损耗程度等参数都可以通过测量透过率来评估，采用共光路复合位移同步扫描技术，通过逐点扫描的方式实现对大口径元件透过率的测量。通过扫描圆周和径向的复合位移，控制上下机械扫描结构，结合振镜对光路的校准，从而实现全口径快速扫描。实验结果表明，所提方法测得光学元件透过率的测量精度为0.2%，测量口径最大600 mm，测量速度大于500 h-1，满足技术指标的要求，实现了对大口径激光元件透过率的高精度测量。

关键词：大口径球面镜透过率复合位移同步控制

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考虑附加弯矩后的大直径螺栓承载能力研究

导弹与航天运载技术（中英文） 2024年第1期 39-45页

作者：张宏宇刘晓华范刚王捷冰李凤全空间物理重点实验室北京100076 首都航天机械有限公司北京100076

为获得大直径螺栓典型连接结构的承载特性,在有限元分析的基础上开展地面试验研究,获得大直径螺栓的轴力与附加弯矩,揭示其破坏机理。分析及试验结果表明,附加弯矩是影响大直径螺栓承载能力的重要因素,考虑附加弯矩后,等效轴力是原始轴... 详细信息

为获得大直径螺栓典型连接结构的承载特性,在有限元分析的基础上开展地面试验研究,获得大直径螺栓的轴力与附加弯矩,揭示其破坏机理。分析及试验结果表明,附加弯矩是影响大直径螺栓承载能力的重要因素,考虑附加弯矩后,等效轴力是原始轴力的数倍。提出了考虑附加弯矩影响后的大直径螺栓强度计算公式,提高了预示精度。此外,开展了降低大直径螺栓附加弯矩的方法研究,指出了结构优化方向。

关键词：大直径螺栓附加弯矩承载等效轴力结构优化

Pretreatment of cyanided tailings by catalytic ozonation with Mn^(2+)/O^3

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Journal of Environmental Sciences 2015年第2期27卷 14-21页

作者： Yulong Li Dengxin Li jiebing Li Jin wang Asif Hussain Hao Ji Yijie Zhai College of Environmental Science and Engineering State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry Donghua University

The increasing amount of cyanided tailings produced as a by-product has gained significant attention in recent years because of the rapid development of the gold industry and extensive exploitation of gold mineral resources. The effective use of these secondary resources is becoming an important and urgent problem for all environmental protection staff. Manganese-catalyzed ozonation for the pre-oxidation of cyanided tailings was studied and the effects of Mn2＋dosage, initial sulfuric acid concentration, ozone volume flow, temperature and agitation speed on pretreatment were examined. The optimum reaction conditions were observed to be： ore pulp density 2.5%, agitation speed 700 r/min,temperature 60°C, Mn2＋dosage 40 g/L, ozone volume flow 80 L/hr, initial sulfuric acid concentration 1 mol/L, and reaction time 6 hr. Under these conditions, the leaching rate of Fe and weight loss could reach 94.85% and 48.89% respectively. The leaching process of cyanided tailings by Mn2＋/O3 was analyzed, and it was found that the leaching of pyrite depends on synergetic oxidation by high-valent manganese and O3, in which the former played an important part.

关键词： Cyanided tailings Pretreatment Mn2+/O3 Catalytic ozonation

Influence of strain rate on grain refinement and texture evolution under complex shear stress conditions

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镁合金学报(英文) 2023年第7期11卷 2558-2584页

作者： Zhaocan Li Guoqin Wu Jianmin Yu jiebing wang Jingjing Han Huiyong Cui Zhimin Zhang College of Materials Science and Engineering North University of China3 Xueyuan RoadTaiyuan 030051China Science and Technology on Space Physics Laboratory China Academy of Launch Vehicle TechnologyBeijing 100076China

The effects of different complex shear stress conditions on grain refinement and texture evolution of Mg-13Gd-4Y-2Zn-0.5Zr alloy were *** increasing strain rate,the average grain size of compression-shear(CS)and compression-torsion(CT)samples are decreased,and the grain size of dynamic recrystallization(DRX)grains is also *** is because that the precipitation number ofβphases is increased,and the hindering effect on grain growth can be significantly *** DRX fractions of CS and CT samples are decreased with increased strain *** low DRX fraction at high strain rate is related to the insufficient time for grains to *** DRX process can be promoted by the PSN mechanism of second phases,and the grain growth can be restricted by the pinning *** the same time,the texture strength is enhanced as the strain rate ***,the kinking degree of lamellar long-period stacking ordered(LPSO)phases is *** complex shear stress conditions,non-basal slip,especially pyramidal slip,is easily activated and the texture is deflected *** with the CS samples,CT samples have smaller average grain size,higher DRX fraction,and lower texture strength for a certain strain *** is because that the equivalent stress of the CT sample is larger,the stress triaxiality is smaller,so more serious dislocations are piled up near grain boundaries and second *** the same time,since CT sample was sheared with torsion,the dislocation movement path can be called“rotational dislocation accumulation”,and the longer distribution path of the CT sample is generated,so more sub-grains and low-angle grain boundaries(LAGBs)are *** with the CS sample,more huge-angle grain boundaries(HAGBs)and DRX grains are formed from grain boundary to grain interior,so better grain refinement effect is achieved.

关键词： Simple shear Compression-shear Compression-torsion Grain refinement Texture evolution ASB

氟比洛芬酯超前镇痛对宫腔镜手术患者术后疼痛、炎症反应指标的影响

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中国计划生育学杂志 2024年第6期32卷 1336-1340页

作者：王学平殷燕妮王结兵蔡小攀陈韬安徽省太湖县人民医院 246000 安徽省安庆市立医院

目的:探究氟比洛芬酯超前镇痛对宫腔镜手术患者术后疼痛、炎症反应指标的影响。方法:选择本院2022年1月-2024年1月收治宫腔镜手术患者138例,随机奇偶数法分为两组各69例,对照组给予全身麻醉,观察组在对照组基础上给予氟比洛芬酯麻醉。... 详细信息

目的:探究氟比洛芬酯超前镇痛对宫腔镜手术患者术后疼痛、炎症反应指标的影响。方法:选择本院2022年1月-2024年1月收治宫腔镜手术患者138例,随机奇偶数法分为两组各69例,对照组给予全身麻醉,观察组在对照组基础上给予氟比洛芬酯麻醉。比较两组术中血流动力学指标、麻醉效果,术后疼痛评分及炎症指标,不良反应。结果:两组扩宫颈时(T1)、术毕前(T2)时心率与平均动脉压均高于麻醉诱导处理前,且观察组T1、T2时HR与MAP均低于对照组;观察组丙泊酚使用量(213.28±2.43 mg)、唤醒时间(3.12±0.75 min)均少于对照组(248.83±2.17 mg、7.53±1.22 min);术后2h、12h、24h时,观察组疼痛评分(1.53±0.36分、2.49±0.74分、1.86±0.53分)均低于对照组(3.72±0.65、4.65±1.18分、3.51±0.62分),血清白介素-6、前列腺素E2、肿瘤坏死因子α、P物质水平均低于对照组(均P0.05)。结论:宫腔镜手术采用氟比洛芬酯超前镇痛有助于减轻患者术后疼痛及炎症反应,提高临床效果,且用药安全。

关键词：宫腔镜手术超前镇痛氟比洛芬酯术后疼痛炎症反应