搜索结果: 1-7 共查到“地质学 brown”相关记录7条 . 查询时间(0.156 秒)
基于Hoek-Brown强度折减法的边坡稳定性图表法研究
边坡工程 岩质边坡 安全系数 强度折减 Hoek-Brown准则 稳定性图表
2018/4/23
边坡稳定性图表为初步评价边坡的稳定性提供一种简单但却行之有效的途径。采用Hoek-Brown有限元强度折减法，提出一套求解Hoek-Brown准则下岩质边坡安全系数的稳定性图表。首先根据Hoek-Brown准则下岩体的正应力与剪切应力的关系，推导关于瞬时内摩擦角 和瞬时黏聚力 的一种显示表达公式，进而实现基于Hoek-Brown准则的有限元强度折减法在数值计算中的实施。算例分析表明，该方法获得的边...
为克服基于Hoek-Brown强度准则的屈服面数值奇异问题，提出新的棱角处屈服面圆化方法，在此基础上，借助ABAQUS二次开发平台，采用FORTRAN语言编制理想弹塑性模型子程序，应力更新算法为完全隐式的向后欧拉积分算法； 提出基于Hoek-Brown准则的有限元强度折减技术，并将其嵌入到圆化后的屈服函数中，探讨了强度折减技术应用于Mohr-Coulomb强度准则和Hoek-Brown非线性强度准...
边坡岩体力学参数对Hoek-Brown准则参数敏感性的综合性分析
广义Hoek-Brown准则 边坡岩体 力学参数 正交试验 综合性分析
2013/11/12
针对广义Hoek-Brown准则参数敏感性分析单因素法的局限性,提出利用正交试验法来研究准则参数对岩体力学参数的影响,该方法可以对各因素的影响进行综合性分析,避免单因素法的片面性。以龙桥特大桥5#拱座所在边坡为工程背景进行了基于正交试验的准则参数敏感性分析。结果表明:地质强度指标GSI对岩体的变形参数Em的影响最显著; 岩石抗压强度σci和岩体扰动系数D对岩体的强度参数C、φ的影响最显著; 总体来...
TRACE ELEMENT DETERMINATIONS COMPARED WITH X-RAY DIFFRACTION RESULTS OF BROWN CLAY IN THE CENTRAL PACIFIC
BROWN CLAY X-RAY DIFFRACTION THE CENTRAL PACIFIC
2011/11/8
Prior to DSDP Leg 17, no sites drilled in the central Pacific had continuously cored a thick section of pelagic brown clay. On Leg 6 several sites were drilled through brown clay, but poor recovery du...
Soil formation on reddish-brown calcareous till under herbaceous vegetation during forty years
experimental modelling primary production primary pedogenesis humus-accumulative process
2009/10/21
A special experiment was established in 1963 and initiated in 1964 at Eerika, Tartu County, Estonia (58°22′ N,26°36′ E) to study pedogenesis and its continuous development under grass-herbaceous veget...
Third Hutton Symposium: The Origin of Granites and Related Rocks. Edited by M. Brown, P.A. Candela, D.L. Peck, W.E. Stephens, R.J. Walker, and E. Zen. Geological Society of America Special Paper 315, 1996
Origin of Granites Related Rocks Geological Society America Special Paper
2012/3/31
The controversies surrounding granites never seem to die.
Two hundred years ago a debate raged over whether granites are
sedimentary or igneous. With James Hutton effectively putting
that one to re...
Characterization and Genetic Interpretation of Clays in an Acid Brown Soil (Dystrochrept) Developed in a Granitic Saprolite
Soil clays Weathering Soil vermiculite Soil smectite Hydroxy-Al intergrades Chlorite Dystrochrept
2012/1/4
X-ray diffraction and chemical analyses were performed on clay fractions separated from an acid brown soil (Dystrochrept) by means of size fractionations using high-gradient magnetic separation techni...