Results 21 to 30 of about 2,893 (150)
, 2018 小型轮式车辆与松软沙地的相互作用会显著地影响车辆的稳定性与安全性,研究二者之间的承压关系对无人地面车辆的设计与应用具有重要意义。利用ABAQUS建立了小型轮式车辆与松软沙地的承压模型,通过自行开发的车轮-土壤相互作用测试系统进行试验,在综合考虑了轮胎和沙地的非线性变形后,建立了5种胎压下轮胎的整合径向静刚度,利用二元线性回归分析法拟合试验数据,确定胎压-负荷-下沉量三者之间的相互关系。针对轮胎在松软地面接地印迹难于提取问题,提出了利用逆向工程技术来完成接地印迹曲面重构设计,进一步验证了耦合模型的准确性 ...
侯亮 +4 more
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Parameter design of coal pillar in highwall mining under action of dynamic-static load [PDF]
, 2023 In view of the application of end slope shearer mining technology to recover a large amount of residual coal, the determination of reasonable width of supporting coal pillar is a key factor whether it can be safely and efficiently popularization and ...
Dong WANG +7 more
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, 2019 为研究干湿循环对花岗岩残积土抗剪强度特性和抗剪强度参数的影响,分析花岗岩残积土边坡的稳定性,改进了常规的单元试验方法.以整个花岗岩残积土边坡为试验对象进行干湿循环模拟,在每次循环后直接在边坡坡面上切取花岗岩残积土试样进行直剪试验.在此基础上,利用有限元软件ABAQUS对一实际边坡进行了干湿循环的数值模拟,在每次循环模拟前对上一次模拟结果进行分析,将等效塑性应变较大区域的土体强度进行适当折减,分析每次循环后花岗岩残积土边坡的应力应变、稳定性以及塑性变形.试验结果表明:花岗岩残积土的抗剪强度随干湿循环次数 ...
于佳静, 张波, 王晖, 陈东霞
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Shear characteristics and mesoscopic damage mechanism of long time soaking red sandstone under loading and unloading conditions [PDF]
The bank slope rock mass below the flood control restricted water level (145 m) in the Three Gorges Reservoir area has experienced long-term immersion in the process of reservoir water lifting and lowering; the water level changes lead to the rock mass ...
Binghao ZHOU +4 more
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Shuitu Baochi Xuebao, 2017 三峡水库消落带在高压淹水浸泡和干湿交替作用下，土壤力学特性必然发生变化，影响土体抗侵蚀性能，破坏库岸稳定性。目前对消落带土壤力学特性变化及其对淹水—落干驱动的响应尚不明确。以三峡水库消落带广泛分布的紫色土为研究对象，模拟水压作用和淹没—出露交替过程，研究紫色土应力—应变和抗剪强度参数对高压淹水和干湿交替作用的响应。结果表明：水柱压力、干湿交替次数和干湿交替幅度都能显著驱动紫色土力学特性发生变化。与对照组相比，随着水柱压力增加，紫色土刚度逐渐增强，黏聚力降低幅度变小，内摩擦角增大。随干湿交替次数增加 ...
吕发友, 鲍玉海, 唐, 曹植菁
doaj
First sliding area analysis of expansive soil slope based on the upper and lower bound solutions [PDF]
Expansive soil landslides are prone to frequent disasters due to the expansion, cracking, and over-consolidation characteristics of expansive soil. However, traditional analysis methods cannot adequately reflect the progressive failure characteristic of ...
Jiong LIANG +3 more
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Shuitu Baochi Xuebao, 2019 旨在从岩土力学性质的角度为崩岗侵蚀提供理论依据，采用直接剪切实验，对鄂东南崩岗区典型花岗岩风化岩土体剖面不同方向上原状土的抗剪强度进行测定，并分析了花岗岩风化岩土体抗剪强度在剖面尺度上的异向性及其影响因素。结果表明，饱和条件下，花岗岩风化岩土体黏聚力和内摩擦角的变化范围分别为3.19~19.26 kPa和26.50°~32.42°，其中B2层黏聚力最大，而各层次间内摩擦角的差异并不明显（p>0.05）；黏聚力和内摩擦角均存在明显的异向性，其中水平方向总体大于垂直方向，且黏聚力的异向性较内摩擦角更明显 ...
娜荷芽 +6 more
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Numerical simulation of plant root system stress response to coal mining disturbances in semiarid mining areas [PDF]
Root damage is a critical ecological issue affecting vegetation in semi-arid underground coal mining areas. The mechanisms and influencing factors of root stress damage induced by stress changes in the root-soil layer due to mining-induced rock mass ...
Chuangang GONG +8 more
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Shuitu Baochi Xuebao, 2023 为了解岩层倾向对喀斯特槽谷区土壤入渗特性的影响,以重庆市青木关岩溶槽谷区顺/逆层坡为研究对象,分析5种典型土地利用方式裸地(AL)、辣椒地(PL)、玉米地(CL)、林地(FL)、草地(GL)在顺/逆层坡的土壤入渗能力差异,并探讨土壤物理性质对土壤入渗能力的影响。结果表明:(1)＞0.25 mm水稳性团聚体含量、毛管持水量、黏粒以及粉粒含量在顺/逆层坡存在显著差异(p0.25 mm水稳性团聚体含量和毛管持水量方面,分别为PL与FL的顺/逆层坡差异最大,在黏粒和粉粒方面,CL的顺/逆层坡差异最大 ...
苟俊菲 +4 more
doaj
振动荷载对厦门地区红黏土抗剪强度影响的试验与分析 [PDF]
, 2007 以厦门某建筑工地红黏土为试样,进行振动荷载作用前、后三轴剪切对比试验。通过对试验数据的分析,对振动荷载对试样的黏聚力、内摩擦角、抗剪强度方程、抵抗侧向变形能力等的影响特性进行研究。研究结果显示,在其他试验条件相同的情况下,经振动荷载作用后的红黏土试样黏聚力降低51.72%,内摩擦角减少50%,抗剪强度线向下显著偏移,表明振动荷载不利于红黏土的稳定和承载 ...
俞登荣, 胡华, 顾恒星
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