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Search Results: 1 - 10 of 37252 matches for " 王维忠 "
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含瓦斯煤全应力–应变过程中力学及渗流特性试验研究
Experiment Study on Mechanics and Permeability of Coal Containing Gas under the Total Stress-Strain Tests
 [PDF]

王倩, 卢明玥, 王维
Mine Engineering (ME) , 2015, DOI: 10.12677/ME.2015.34026
Abstract:
利用自行研制的含瓦斯煤热流固耦合伺服渗流试验装置,以原煤试样为研究对象,进行含瓦斯煤全应力–应变渗流试验。研究表明:在连续加载过程中,含瓦斯煤的应力–应变关系可以分为四个阶段:初始压实阶段、弹性阶段、屈服破坏阶段、破坏后阶段,这四个阶段煤样的应力–应变关系有较大差异;含瓦斯煤的弹性模量先下降后稳定,在破坏后快速下降;泊松比先下降后缓慢上升,在破坏后快速上升;含瓦斯煤的轴向应力与渗透率随轴向应变的变化规律基本呈相反的趋势;含瓦斯煤渗透率与体积应变密切相关,但分析发现,煤样体积最小时,其渗透率不是最低。
A self-developed device called the coal-containing heat solid coupling servo seepage device is used to do the total stress-strain tests of coal samples. The result shows: In the process of continuous load, the stress-strain relationship of coal containing gas can be divided into four stages: the initial com-paction phase, the elastic phase, the yield and damage phase, the post-failure phase. The stress- strain relationship of these four phases makes a big difference; elastic modulus of coal containing gas first decreases and then keeps constant; it declines rapidly after destruction; the Poisson's ratio firstly dropped after a slow rise, and it raised rapidly after destruction. With the change of axial stress, the axial stress of the coal containing gas and its permeability is opposite. Permeability of the coal containing gas is closely related with its volumetric strain. But we have analyzed and found that, the permeability of the coal is not the lowest when its volume is the smallest.
水压作用对裂隙岩体断裂行为影响研究
Study on the Effect of Hydraulic Pressure on Fracture Behavior of Fractured Rock
 [PDF]

王倩, 卢明玥, 王维
Mine Engineering (ME) , 2016, DOI: 10.12677/ME.2016.43017
Abstract:
为研究在地应力场与水压耦合作用下裂隙岩石破坏特性,利用MTS815岩石力学测试系统,并结合柱塞泵水压加载装置,对含有预制裂隙的混凝土试样加载预应力后,进行有无水压作用单轴循环加卸载压缩破坏对比试验。试验结果表明:有水压作用的试件在加载初期便出现初始裂隙,而无水压时试件往往在塑性区或接近塑性区时出现初始裂隙,两者的破坏模式也不相同,在有水压作用时,试件是由于水压引起的表面裂纹扩展而导致破坏,而无水压时则是因为试件内部损伤微裂隙扩展引起的失稳破坏;然而两种条件下的试件强度相差不大,但其破坏过程中产生的耗散能却高于后者。
In order to study the failure characteristics of rocks under coupling effect of ground stress field and seepage field, MTS815 rock mechanics test system combined with plunger pump hydraulic loading device are used to load water pressures on concrete samples containing precast crack. After that, uniaxial cyclic loading and unloading compression failure contrast experiments are conducted with the seepage field and without the seepage field. The results show that: specimens with the seepage field present initial crack at the initial stage of loading, but species without seepage field present initial crack always in plastic zone or close to plastic zone. The failure mode under both conditions is not the same. The failure is caused by surface crack expand under the water pressure effects, and without water pressure it is caused by the internal damage and micro cracks extend. The strength under the two kinds of conditions is equivalent, while the dissipated energy in the process of failure is higher than those without seepage field.
不同的水质评价方法在澜沧江源区水环境质量评价中的应用
The Application of Different Water Quality Evaluation Methods in Water Quality Assessment of Lancang River Source Region
 [PDF]

王维
Journal of Low Carbon Economy (JLCE) , 2015, DOI: 10.12677/JLCE.2015.42003
Abstract:
根据2012年澜沧江源区水质监测结果,利用指数评价法、水质标识指数法、灰色关联分析法对澜沧江源区水质进行评价,并结合评价结果对这几种水质评价方法进行分析比较。结果表明:综合污染指数评价法、综合水质标识指数法能一定程度上平衡污染因子对水环境质量的贡献度,较为真实的反应水体的整体状况;灰色关联分析法可作为重要的水环境质量评价分析的辅助方法。
According to 2012 Lancang River source region water quality monitoring results, the water quality in the Lancang River source region is evaluated by using exponent evaluation, water quality identification index method, gray correlation analysis method. Combining with the evaluation re-sults, these methods of water quality evaluation are analyzed and compared. The results showed that the comprehensive pollution index method and water quality identification index method can balance the contribution of pollution factor to the water environment quality, the overall situation is more real reaction to the water bodies; gray correlation analysis method can be used as an im-portant adjunct water environment quality assessment analysis.
梁的刚度及弯矩突变时的差分处理
王维,袁祥
力学与实践 , 1990, DOI: 10.6052/1000-0992-1990-142
Abstract: 积分等解析方法求梁挠度的基本方程是挠曲线近似微分方程(?)=M/El,因此无论是M还是El突变,都将使(?)出现不连续性问题.本文将考虑(?)的不连续性问题,导出求解挠度的一般中央差分方程.
坑道透视法在石炭井二矿的应用
刘杰,王维
煤田地质与勘探 , 1997,
Abstract: 针对石炭井二矿矿井地质小构造问题,选用矿井坑道透视法探查,取得了好的应用效果,并就应用问题,谈了几点体会。
双铂电阻对称式恒流电桥及其在测量海水温度中的应用
王维,徐烈
华东政法大学学报 , 1981,
Abstract: 海水温度的测量,是海洋研究中最重要的基本测量之一。所需要的观测精度,通常根据不同的任务和目的而不同。许多情形下能达到±0.1℃已经足够。有时则要求±0.01℃或更高。随着海洋研究和开发的日益发展,迫切需要能有不同精度的可以连续测量、走航直读的数字式测温仪器。目前国内普遍使用的设备尚不能满足这方面的要求。为便于对温度作连续的测量,人们广泛采用性能稳定的铂电阻作感温元件,通过惠斯顿电桥将温度转变成电压信号,由于电桥和铂电阻的非线性,难以给出直读的结果,只好用查鉴定曲线或分段测量等方法。
一种新型岩石类材料平面应变实验装置的研制和应用
黄滚,尹光志,王维
重庆大学学报 , 2009, DOI: 10.11835/j.issn.1000-582X.2009.05.016
Abstract: 介绍了一种新型岩石类材料平面应变实验装置的研制和应用。该装置的主要特点是可以通过一个厚壁筒液压缸对安置在其中的方形试件施加侧向压力(最小主应力),最高压力可达20MPa,从而最大程度地减少了刚性加载所带来的端部约束问题,提高了实验精度。利用缸体本身的刚度对试件进行侧限的设计,使得装置结构紧凑,实验简单易行。采用弹性材料试件对装置进行了校准标定,并介绍了变形测量系统。最后,对岩石试件进行了平面应变实验,结果表明,该实验装置能较好地模拟平面应变状态。
喷雾干燥的最新进展
王维,阎红,王喜
南京林业大学学报(自然科学版) , 1997, DOI: 10.3969/j.jssn.1000-2006.1997.07.008
Abstract: <正>介绍了喷雾干燥技术在研究、放大、节能和扩展其应用领域方面的最新进展.
关于"环境"的概念和环境科学的研究对象
王维
环境科学 , 1978,
Abstract: 环境科学是一门新兴的学科。它同一切新学科一样,在开创时期,不可避免地存在着很多不完备之处,有待于进一步发展和完善。当前在辩证唯物论的指导下,对于“环境”的概念以及环境科学的研究对象、基础理论、方法、技术及手段等,进行有目的地探讨,无疑将对环境科学本身的发展,起着不可低估的促
鄂西南三个自然保护区蚁科昆虫的区系调查
王维
应用昆虫学报 , 2007,
Abstract: 星斗山自然保护区、木林子自然保护区和坪坝营自然保护区地处湖北省西南山区,地形地貌复杂,属大陆性中亚热带季风湿润气候,昆虫资源十分丰富,作者首次报道这3个自然保护区蚂蚁的种类和分布。结果表明3个自然保护区共有蚂蚁53种,隶属于5亚科,22属。在区系组成上,东洋界种
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