共查询到17条相似文献，搜索用时 250 毫秒
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为配制可模拟目标围岩的相似材料,在铁晶砂材料的基础上,采用石膏和水泥两种胶结材料,设置骨胶比、(m铁粉+m重晶石粉)/m骨料、m铁粉/(m铁粉+m重晶石粉)及m石膏/m水泥4个因素,一个因素设5个水平,共25组配比的正交试验方案。通过敏感性和线性回归分析,研究力学参数对影响因素的显著性及力学参数与各因素之间的定量关系。结果表明：相似材料力学参数可满足大部分类型岩体模型试验对材料力学参数的要求;对各因素及重晶石粉在骨料中占比与力学参数之间进行敏感性分析,其影响效果规律性强,可确定围岩相似材料配比;线性回归方程可量化参数与影响因素之间的关系,通过对比试验结果和回归分析结果,二者吻合性较强。 相似文献
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以重晶石、石英砂和凡士林等混合物作为铁路隧道软弱围岩的相似材料。基于响应面分析法中的二次回归通用旋转法设计实验,将有效应力条件下的有效粘聚力与有效内摩擦角作为铁路隧道软弱围岩的研究指标。通过应力控制式三轴试验仪,进行常规三轴试验。利用非线性回归分析的方法对相似材料配比与软弱围岩指标之间的关系进行分析,并对各回归系数进行实际试验与拟合检验,得出围岩物理力学指标与相似材料配比的变化规律。 相似文献
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为获得不同埋深下具有岩爆倾向性的灰岩相似模型,引入岩爆能量原理建立岩爆相似准则,参考原岩相关参数结合岩爆相似准则推算相似模型对应的原岩目标相关参数。引入岩爆倾向性指数、弹性能和耗散能,以石英粉含量、重晶石粉含量、石膏水泥质量比、水含量为影响因素,采用4因素5水平的正交试验方案,进行单轴抗压试验得到各项参数。对试验结果进行敏感性分析及多元线性回归分析,将不同埋深下灰岩相似模型参数带入线性回归方程,并考虑敏感性分析结果对材料配比进行优化,得出不同埋深下灰岩相似模型优化配比及物理参数,为灰岩室内研究提供参考。 相似文献
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节理化岩体强度与力学参数估计的地质强度指标GSI法 总被引：2，自引：0，他引：2
确定大体积节理化岩体强度与力学参数是很困难的,这主要是由于节理化岩体试件尺寸太大及岩体所含节理裂隙所致.然而广义HOEK-BROWN准则的出现,为此提供了解决问题的新途径.本文提出了一种确定大体积节理化岩体强度与力学参数的简易经济的新方法——地质强度指标GSI法. 相似文献
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介绍了一种基于嵌入式数据采集系统设计的岩体力学检测和计算分析系统。通过人机对话设定初始参数,进行多路数据采集和处理,存储量大。可以实时采集各种压力、位移、速度等动态信号,并能实时跟踪观察整个试验过程。采用该系统进行岩体力学试验, 表明系统性能可靠,操作方便。 相似文献
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研究水泥为再生剂冷再生材料在施工中最佳剂量.通过室内试验,对旧路面层与基层沥青混合料（Ⅰ型混合料）和旧路面层材料（Ⅱ型混合料）的物理力学性质进行了分析与评定,进行了路用性能试验研究。确定了水泥为再生剂的Ⅰ型、Ⅱ型冷再生材料施工中的最佳剂量. 相似文献
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重塑土物理力学特性试验参数的影响因素分析 总被引：2，自引：0，他引：2
界定重塑土的定义、把握重塑土土体结构特征、选择适宜的试样制备工艺，在获取重塑土物理、力学特性试验参数中是很重要的。该文针对重塑土物理力学特性试验参数的影响因素进行了深入分析。 相似文献
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以超细钢铁渣粉(以下简称“超细钢渣”) 为主要掺合料制备胶凝材料,通过XRF、粒径分析、XRD分析和力学性能测试,探究超细钢渣对水泥基材料的力学性能影响。结果表明:通过机械研磨制备出的超细钢渣,其矿相成分硅酸三钙、硅酸二钙和莫来石特征峰强度最强,复掺的超细钢渣活性指数也满足国家标准。随着超细钢渣掺量增加,3 d 抗压和抗折强度均出现逐渐降低的趋势,但在外掺m (超细钢渣) ∶ m (超细矿渣)= 2:3、w复合粉=30%时,其28 d 抗压和抗折强度达到峰值,分别为8.9、53.8 MPa。超细钢渣在不同龄期水化反应程度不同,早期水化反应较低,强度较差;后期水化程度较高,且优于同标准水泥。 相似文献
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Mechanical and physical properties, such as tensile strength, elongation at break, modulus of elasticity, Shore D hardness,
melt flow rate (MFR), and electrical and thermal conductivities of composites with high density polyethylene matrix reinforced
with Al powders were investigated experimentally. Measurements of the mechanical and physical properties were performed up
to a reinforcing component concentration of 30% volume Al powder and compared with mathematical models from the literature.
The obtained results have shown that experimental data were in good agreement with theoretical data. The ultimate tensile
strength (UTS) and elongation at break decreased with increasing Al powder content, which was attributed to the introduction
of discontinuities in the polymer structure, and modulus of elasticity increased with increasing Al content. The composite
preparation conditions allowed the formation of a random distribution of metallic particles in the polymer matrix volume for
system high density polyethylene-Al (HDPE-Al). There was a cluster formation of Al particles at higher Al contents in the
polymer matrix. Electrical and thermal conductivity values of HDPE-Al composites were higher than pure HDPE values. 相似文献
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为了深入探究岩石物理力学性质,选取红砂岩作为试验材料,以冻融循环次数、围压作为研究指标,通过设计影响因素测试试验,探究这两项指标对岩石性能的影响。试验测试结果表明,围压、冻融循环次数两项影响因素对岩石的三轴抗压强度、弹性模量均有较大影响,力学性能变化显著。 相似文献
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This paper proposes a new continuity model for engineering in rock masses and a new schematic method for reporting the engineering of rock continuity.This method can be used to evaluate the mechanics of every kind of medium;and is a new way to determine the mechanical parameters used in engineering design in rock masses.In the numerical simulation,the experimental parameters of intact rock were combined with the structural properties of field rock.The experimental results for orthogonally-jointed rock are given.The results included the curves of the stress-strain relationship of some rock masses,the curve of the relationship between the dimension △ and the uniaxial pressure-resistant strength σc of these rock masses,and pictures of the destructive procedure of some rock masses in uniaxial or triaxial tests,etc.Application of the method to engineering design in rock masses showed the potential of its application to engineering practice. 相似文献
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路堑岩质边坡具有规模大、数量多、参数获取困难、治理难度大等特点,历来是线路工程中的研究热点.为了解决路堑岩质边坡的稳定评价问题,建立边坡稳定性的模糊综合评价体系,可供同类工程借鉴.根据路堑岩质边坡的特点,以系统全面性、简明科学性、相对独立性及灵活可操作性为原则,选取合理的边坡稳定性评价指标,建立边坡稳定性的模糊综合评价体系,运用层次分析法确定评价指标的权重,建立了路堑岩质边坡的稳定性分级模型.以某国道辅线K57+411～K57+536段边坡为例,运用该模型对其稳定性级别进行了模糊综合评判分级,其结果为不稳定,与规范法的评价结果一致,表明该方法是合理实用的. 相似文献
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The main thrust of this research was to determine the effectiveness of polyvinyl alcohol (PVA) powder in enhancing the durability of short GFRC materials. Accelerated aging of the materials was achieved through low-pressure steam curing in a moist chamber. The strength and ductility of GFRC were measured by the direct tension test, which showed that incorporation of PVA powder into GFRC could improve its mechanical behaviour and turn it from brittle to ductile. To investigate the mechanism of the tensile strength enhancement, the fiber-matrix interface was examined by polarizing optical microscopy and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). It was found that PVA powder tended to migrate to the fiber-matrix interfacial zone and thus prevented the accumulation of calcium hydroxide in this area. PVA film around the fiber resulted in a more ductile interfacial microstructure and better bonding between fiber and matrix, which should be responsible for enhancing the tensile property and preventing the aging of GFRC. Furthermore, PVA powder reduced the microhardness and brittleness at the interface. 相似文献
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INTRODUCTION In powder compaction, the characteristics ofthe powder affect the compaction behavior and thequality of the pressed green body and its relativedensity, porosity, pore size distribution, sinteringand the consequent microstructure of the final sin-tered body. Superfine powder is prerequisite forpreparing high performance ceramic materials (Liu,1996; Lange et al., 1983; Lange, 1989). At present,most of the chemosynthesis methods are not suit-able for preparing industrial … 相似文献