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学者姓名:许旭堂
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Abstract :
The presence of cracks significantly influences the engineering properties of unsaturated residual soil, particularly under external air pressure fluctuation (i.e. Delta u(a)). A formula is developed that integrates existing crack depth theories with factors such as soil shear strengths, effective stress parameters, effective tensile strength reduction coefficients, and environmental changes like infiltration and evaporation. In addition, a further equation is deduced to determine the surface flow rate cracking value Q(0), which can reflect the influence of seasonal climate on the matric suction of the surface soil. Our findings reveal that crack depth is quite reactive to short-term fluctuations in external air pressure, effective stress parameters and evaporation intensity, with remarkable increases in crack depth linked to these variations. The theoretical depth of soil crack increases by 0.12 similar to 0.27m when the external air pressure fluctuation (i.e. Delta u(a)) is 3 kPa. Soils subjected to climatic conditions crack only when Q>Q(0), and early cracking of soils under Delta u(a)>0 is conditioned by increasing infiltration and effective cohesion or reducing evaporation. The variation rule of the theoretical crack depth calculated in this research shows consistency with the previous equations, and the model predictions at Delta u(a) = 3kPa are proved to match well with the measured results of the practical engineering subjected to various climate environment factors.
Keyword :
crack propagation depth crack propagation depth short-term variations in external air pressure short-term variations in external air pressure strength parameters strength parameters surface flow ratio surface flow ratio Unsaturated residual soil Unsaturated residual soil
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| GB/T 7714 | Xu, Xu-tang , Jian, Wen-bin , Cai, Ye-qing et al. Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure [J]. | GEOMATICS NATURAL HAZARDS & RISK , 2025 , 16 (1) . |
| MLA | Xu, Xu-tang et al. "Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure" . | GEOMATICS NATURAL HAZARDS & RISK 16 . 1 (2025) . |
| APA | Xu, Xu-tang , Jian, Wen-bin , Cai, Ye-qing , Chen, Xiang-long . Research on influential factors of crack propagation depth of unsaturated residual soils under short-term variations in external air pressure . | GEOMATICS NATURAL HAZARDS & RISK , 2025 , 16 (1) . |
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Residual soil widely distributed in Fujian region has the characteristics of strong structure and easy softening in contact with water, which limits the possibility of its beneficial utilization. This study investigates the impact of humid and hot environment on the strength characteristics of residual soil, and how changes in soil microstructure are correlated with strength attenuation. Residual soil with particle size distribution from gravel to clay was subjected to repeated hygroscopic cycle tests. Subsequently, unsaturated triaxial consolidation drainage shear (CD) and nuclear magnetic resonance (NMR) tests were carried out on the samples undergoing 0-7 hygroscopic cycles, and the damage mechanism of the soil was analyzed from macroscopic to microscopic scales. Results showed that the soil shear characteristics were influenced by the number of hygroscopic cycles and had a correlation with stress level (confining pressure and target suction), the greater the cumulative irreversible deformation and the more pronounced shear dilation characteristics of the soil had after more hygroscopic cycles and higher stress levels. The shear strength index of unsaturated soil after repeated hygroscopic paths presented a decreasing trend, but the attenuation of internal friction angle and suction friction angle was limited, and the average values were 21.3 degrees and 14.7 degrees, respectively. The T 2 spectral distribution curve of soil was a trimodal pattern, and the content of small holes consistently decreasing as the cycling process progressed, while the percentage of macropores increased significantly. In view of the continuous dissolution of soluble minerals and cementing materials and the repeated release of suction in the soil, the internal particles of the soil were gradually loosened. Accompanied by the continuous expansion and penetration of intergranular pores, connecting cracks were ultimately formed. The above fatigue damage to the soil pore structure led to the attenuation of its macro-mechanical properties. Throughout the test, the saturated shear strength of the soil continued to decrease due to the interaggregate connection was always broken, while the destruction of the intergranular connection in the aggregate was relatively slow, and the internal friction angle in the soil implied a slow decrease and even stabilized at a later stage. The research results could provide a useful reference for a deeper understanding of the environmental damage effects on the soil macroscopic mechanical properties.
Keyword :
microstructure microstructure repeated hygroscopic cycles repeated hygroscopic cycles residual soil residual soil saturated shear strength saturated shear strength suction friction angle suction friction angle
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| GB/T 7714 | Xu, Xu-tang , Chen, Xiang-long , Cai, Ye-qing et al. Microstructure and macro-mechanical properties of residual soil subjected to repeated hygroscopic cycles [J]. | FRONTIERS IN EARTH SCIENCE , 2025 , 13 . |
| MLA | Xu, Xu-tang et al. "Microstructure and macro-mechanical properties of residual soil subjected to repeated hygroscopic cycles" . | FRONTIERS IN EARTH SCIENCE 13 (2025) . |
| APA | Xu, Xu-tang , Chen, Xiang-long , Cai, Ye-qing , Xu, Xiang . Microstructure and macro-mechanical properties of residual soil subjected to repeated hygroscopic cycles . | FRONTIERS IN EARTH SCIENCE , 2025 , 13 . |
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Abstract :
针对山区道路岩质边坡在动荷载作用下的疲劳劣化特性,开展循环荷载作用下充填结构面岩体的剪切特性研究。基于自制的岩石直剪仪以及自动化采集系统,设计并使用天然岩样进行直剪试验,分析不同起伏角和充填度下结构面岩体的应力-应变曲线发展和强度演化特性,并利用平均剪胀角来表征起伏角和充填度对充填结构面岩体剪切特性的影响。研究结果表明:小起伏角结构面岩体以无峰型应力-位移曲线为主,而大起伏角的无充填、充填结构面岩体分别以陡峰型、缓峰型曲线为主,上扬型曲线主要出现于高起伏角及高充填度的结构面;随着起伏角的增加,结构面岩体剪切强度峰值因剪断破坏加剧而逐渐增强,并呈现强剪缩、弱剪胀特点;随着充填度的增加,结构面岩体剪切强度峰值及其差值均减小,且循环剪切过程中因充填层的压密效应显著,导致其剪胀特性不明显;结构面岩体剪切应力峰值和平均剪胀角均随循环剪切次数的增加而减小,并渐趋于稳定,且结构面的磨损程度也逐渐降低;当充填度大于1时,平均剪胀角的下降主要由结构面磨损、充填物部分挤出导致;当充填度小于1时,平均剪胀角的降低由结构面剪断、滑移磨损所引起。研究成果可为循环荷载作用下的山区道路岩坡长期安全、稳定及耐久性评价提供参考。
Keyword :
充填度 充填度 充填结构面 充填结构面 循环剪切次数 循环剪切次数 循环荷载 循环荷载 起伏角 起伏角 道路工程 道路工程
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| GB/T 7714 | 许旭堂 , 陈翔龙 , 杨枫 et al. 循环荷载对充填结构面岩体剪切特性的影响 [J]. | 长安大学学报(自然科学版) , 2025 , 45 (01) : 24-37 . |
| MLA | 许旭堂 et al. "循环荷载对充填结构面岩体剪切特性的影响" . | 长安大学学报(自然科学版) 45 . 01 (2025) : 24-37 . |
| APA | 许旭堂 , 陈翔龙 , 杨枫 , 鲜振兴 , 徐祥 . 循环荷载对充填结构面岩体剪切特性的影响 . | 长安大学学报(自然科学版) , 2025 , 45 (01) , 24-37 . |
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倾斜受荷刚性桩复合地基的设计缺少相关规范的指导,进一步认识刚性桩复合地基倾斜受荷变形特征,对完善其设计理论具有重要意义。基于透明土,开展倾斜受荷刚性桩-黏性土复合地基模型试验;采用PIV图像测试技术处理试验结果,初步研究倾斜受荷刚性桩-黏性土复合地基的变形特征;全面分析不同垫层厚度(厚径比)、竖向荷载和旁压荷载对加载板和桩周黏性土位移的影响。研究表明:黏性土复合地基中桩顶水平位移的变化规律与砂土复合地基相似;竖向荷载、厚径比和旁压荷载不会影响加载板随水平荷载的变化规律,但会影响其水平位移值的大小;桩周黏性土的水平位移随着竖向荷载和厚径比的增大而减小,随着旁压荷载的增大而增大;厚径比和旁压荷载均会影响地基的水平承载力,需合理控制复合地基的厚径比和考虑挡土墙后填土自重的影响;竖向荷载会影响地基的破坏形式和水平承载力的发挥,对于承受较小竖向荷载的地基,需注意地基水平承载力的发挥程度。研究成果可为刚性桩-黏性土复合地基的进一步深入研究提供重要参考。
Keyword :
倾斜荷载 倾斜荷载 变形特征 变形特征 旁压荷载 旁压荷载 桩周黏性土 桩周黏性土 水平承载力 水平承载力 透明土 透明土
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| GB/T 7714 | 黄志波 , 吴能森 , 许旭堂 . 倾斜受荷刚性桩-黏性土复合地基变形研究 [J]. | 内蒙古农业大学学报(自然科学版) , 2025 , 46 (05) : 70-77 . |
| MLA | 黄志波 et al. "倾斜受荷刚性桩-黏性土复合地基变形研究" . | 内蒙古农业大学学报(自然科学版) 46 . 05 (2025) : 70-77 . |
| APA | 黄志波 , 吴能森 , 许旭堂 . 倾斜受荷刚性桩-黏性土复合地基变形研究 . | 内蒙古农业大学学报(自然科学版) , 2025 , 46 (05) , 70-77 . |
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为研究紫穗槐和胡枝子两种植被根系对残积土边坡的渗流稳定性影响,本实验研究设计采用数值模拟的方法进行研究,以Geo-studio软件为平台,计算分析不同降雨强度作用下,裸坡与指数形根系和均布形根系对边坡渗流及稳定性的影响规律,计算的内容包括孔隙水压力、饱和度和安全系数。研究结果表明:植被边坡的孔隙水压力的上升速度大于裸坡,指数形根系边坡的敏感性高于均布形根系边坡;植被边坡比裸坡易达到饱和,指数形根系边坡对饱和度的变化同样具有较高的敏感性,饱和度变化幅度与降雨强度呈负相关的关系;对残积土边坡稳定性影响效果,指数形根系对边坡稳定性表现得更有利,降雨强度较小时均布形根系提高作用稳定,降雨强度增大时其安全系数向裸坡靠拢,而指数形根系在四种降雨强度下对边坡仍可稳定发挥提高作用,且安全系数一直位于均布形根系之上,对提高残积土边坡稳定性的积极性更高。
Keyword :
均布形根系 均布形根系 指数形根系 指数形根系 残积土边坡 残积土边坡 渗流稳定性 渗流稳定性 降雨 降雨
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| GB/T 7714 | 李光杰 , 许旭堂 . 降雨条件下草本植物根系对残积土边坡渗流稳定性的影响 [J]. | 井冈山大学学报(自然科学版) , 2024 , 45 (03) : 86-98 . |
| MLA | 李光杰 et al. "降雨条件下草本植物根系对残积土边坡渗流稳定性的影响" . | 井冈山大学学报(自然科学版) 45 . 03 (2024) : 86-98 . |
| APA | 李光杰 , 许旭堂 . 降雨条件下草本植物根系对残积土边坡渗流稳定性的影响 . | 井冈山大学学报(自然科学版) , 2024 , 45 (03) , 86-98 . |
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依据混凝土用量相等原则,将一实际加固边坡工程中采用的单排抗滑桩等效为全埋刚架桩,并采用有限元分析软件ABAQUS分别建立了全埋刚架桩和单排抗滑桩加固边坡的三维有限元模型,得到了两者加固边坡的安全系数和水平位移、桩内力及位移分布规律,并从定量的角度直观的对比刚架桩与单排桩加固边坡效果及受力的差异性,以探讨刚架桩加固边坡的优势。研究表明,相比较于单排抗滑桩,单排抗滑桩弯矩分布为“弓”形,而全埋刚架桩的弯矩分布呈“S”形;全埋刚架桩由于连梁的协调作用,其内力更小,采用全埋刚架桩加固边坡的位移更小,安全系数更大,边坡更安全。
Keyword :
全埋刚架桩 全埋刚架桩 单排抗滑桩 单排抗滑桩 强度折减有限元法 强度折减有限元法 数值模拟 数值模拟 边坡 边坡
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| GB/T 7714 | 徐祥 , 李嘉卿 , 黄剑斌 et al. 全埋刚架桩与单排抗滑桩加固边坡效用对比分析 [J]. | 土工基础 , 2024 , 38 (03) : 394-398 . |
| MLA | 徐祥 et al. "全埋刚架桩与单排抗滑桩加固边坡效用对比分析" . | 土工基础 38 . 03 (2024) : 394-398 . |
| APA | 徐祥 , 李嘉卿 , 黄剑斌 , 钟华 , 许旭堂 . 全埋刚架桩与单排抗滑桩加固边坡效用对比分析 . | 土工基础 , 2024 , 38 (03) , 394-398 . |
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本发明提出一种基于遗传模拟退火算法的岩体结构面优势产状分组方法,包括以下步骤:将结构面产状数据转化为单位法向量并获得数据集,设置控制参数,生成初始聚类中心和初始种群,计算样本隶属度和适应度函数值,使用遗传算法对初始种群进行选择、交叉、变异操作获得新种群,采用模拟退火算法对新生成的个体进行判断与选择,更新种群、聚类中心、隶属度和适应度值,并通过Xie‑Beni有效性指标获得最佳分组结果。本发明利用模拟遗传退火算法结合模糊C均值聚类算法,克服了模糊C均值聚类算法需要指定聚类中心的缺陷,在确定聚类组数后,算法在聚类过程中能够自动寻找最优聚类中心,得出的结果更加准确。
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| GB/T 7714 | 阮云凯 , 黄炜 , 刘伟城 et al. 一种基于遗传模拟退火算法的岩体结构面优势产状分组方法 : CN202411028040.7[P]. | 2024-07-30 . |
| MLA | 阮云凯 et al. "一种基于遗传模拟退火算法的岩体结构面优势产状分组方法" : CN202411028040.7. | 2024-07-30 . |
| APA | 阮云凯 , 黄炜 , 刘伟城 , 陈锦资 , 王坛华 , 杨运林 et al. 一种基于遗传模拟退火算法的岩体结构面优势产状分组方法 : CN202411028040.7. | 2024-07-30 . |
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本实用新型涉及一种爆破测振仪可充电保护装置,包括箱体和箱盖,箱盖盖合于箱体顶部,所述箱体前端设置有拉链和密码锁,拉链用于密封连接箱体和箱盖,所述密码锁与拉链配合锁固;箱体内部设置有分类隔板,所述箱盖顶部设置有推拉防爆透明隔板,所述箱盖内部设置有伸缩弹簧装置,所述箱体的右侧端设置有数据连接线开口,所述箱盖的底部设置有充电数据线开口;所述伸缩弹簧装置包括固定于箱盖内部的弹簧底座,所述弹簧底座顶部固定安装有伸缩内外筒,所述伸缩内外筒顶部安装有太阳能充电板,太阳能充电板通过充电数据线开口与爆破测振仪相连接进行供电,能够避免存在爆破飞石等杂物破坏仪器或者监测过程中设备电量不足关机的问题。
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| GB/T 7714 | 郭良昕 , 吴能森 , 李佳佳 et al. 一种爆破测振仪可充电保护装置 : CN202322924453.0[P]. | 2023-10-30 . |
| MLA | 郭良昕 et al. "一种爆破测振仪可充电保护装置" : CN202322924453.0. | 2023-10-30 . |
| APA | 郭良昕 , 吴能森 , 李佳佳 , 许旭堂 , 崔广强 . 一种爆破测振仪可充电保护装置 : CN202322924453.0. | 2023-10-30 . |
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本实用新型涉及一种岩石力学试件结构面打磨装置,包括横向设置的若干支架和两根立柱,两根立柱分别设置于若干支架左右两端,所述立柱表面挂载有数控编程窗口,两个所述立柱之间架设有打磨部件,所述打磨部件包括固定连接于立柱顶部的X轴导轨,所述X轴导轨上横向滑动连接有Z轴导轨,所述Z轴导轨外壁安装有万向竹节水管,所述Z轴导轨底部连接有打磨电机,所述打磨电机底部通过接口卡接有磨头,所述磨头位于若干支架上方;若干所述支架顶部架设有底座和顶升部件,所述顶升部件设置于底座的左右两侧,所述底座和顶升部件的顶部连接有试样夹持部件,能够成批量且高精度生产岩石力学试件。
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| GB/T 7714 | 陈翔龙 , 许旭堂 , 杨枫 et al. 一种岩石力学试件结构面打磨装置 : CN202322035689.9[P]. | 2023-07-31 . |
| MLA | 陈翔龙 et al. "一种岩石力学试件结构面打磨装置" : CN202322035689.9. | 2023-07-31 . |
| APA | 陈翔龙 , 许旭堂 , 杨枫 , 刘伟城 , 徐祥 , 吴能森 et al. 一种岩石力学试件结构面打磨装置 : CN202322035689.9. | 2023-07-31 . |
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本发明涉及车辆荷载振动领域,具体来说涉及一种模拟路基边坡动力响应的汽车模型装置,包括车身、车架、调节装置以及车轮;所述车架设置在所述车身内,包括套管、连接管以及轮轴;所述套管水平中空;两所述连接管的一端分别滑动套设在所述套管的两端,另一端分别固定一所述轮轴的中部;所述轮轴的两端分别设置一所述车轮;所述调节装置包括第一调节机构和第二调节机构;所述第一调节机构固定在所述套管中部,所述第一调节机构两侧分别与一所述连接管铰接;两所述第二调节机构分别固定在一所述轮轴上,所述第二调节机构两侧分别与位于同侧的所述车轮铰接,其通过室内模型试验重现多类型汽车荷载对路基边坡动力响应及变形演化全过程。
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| GB/T 7714 | 许旭堂 , 杨枫 , 刘伟城 et al. 一种模拟路基边坡动力响应的汽车模型装置 : CN202310122881.3[P]. | 2023-02-16 . |
| MLA | 许旭堂 et al. "一种模拟路基边坡动力响应的汽车模型装置" : CN202310122881.3. | 2023-02-16 . |
| APA | 许旭堂 , 杨枫 , 刘伟城 , 李光杰 , 陈翔龙 , 阮云凯 et al. 一种模拟路基边坡动力响应的汽车模型装置 : CN202310122881.3. | 2023-02-16 . |
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