澜沧江中下游斜坡稳定性评价预测的理论与方法探讨     

周钜乾  唐川 《云南地理环境研究》1995,7(1):29-38

本文以澜沧江下游流域边坡稳定性评价为实例，对模糊评判模型的应用问题和处理技术进行了论述。认为该模型简便实用、效果稳健、适应性强，是边坡稳定性评价工作中适宜推广的一个实用模型。此外，文中还提出了用于模糊评判模型的信息检验法，讨论了这一方法在遴选有效评价因子和优化模型效能中的作用。  相似文献   

Determination of shear strength of conglomerates using a caterpillar D9 ripper and comparison with alternative methods   总被引：1，自引：0，他引：1  

J. P. Savely 《Geotechnical and Geological Engineering》1990,8(3):203-225

Summary A method of determining shear strength in Gila Conglomerates at Inspiration Mine (now Cyprus Miami Mine), Arizona, using Caterpillar D9H and D9L rippers is described. The results are compared with data obtained using laboratory direct shear tests — both large and small scale, back analysis and boulder modelling. The significance of scale, particularly relating to boulder size is discussed.  相似文献   

Diffusion models of slope development     

A. M. Trofimov  V. M. Moskovkin 《地球表面变化过程与地形》1984,9(5):435-453

This paper represents a systematic investigation of slope evolution diffusion models and has the following sections: (1) The model of slope development with linear coefficient k = k₀x; (2) The model of slope development with quadratic coefficient in x; (3) Slope development model with vertical lowering of base level (downcutting); (4) Slope development model with the base level a horizontal variable (undercutting); (5) Steady-state regime of undercut slopes; (6) Model of a pediment and scree slope formation. The comparison is made between mathematical and classical methods of slope evolution analysis.  相似文献   

Slope process change and colluvium deposition in Swaziland: An SEM analysis     

Andrew Goudie  Peter A. Bull 《地球表面变化过程与地形》1984,9(3):289-299

Electron microscope analysis of sixty samples taken from six colluvium sites in Swaziland has shown that the quartz grains exhibit marked edge abrasion in the uppermost beds of exposures. This edge abrasion is lacking in the lower beds in all sections examined and indicates slope process change during colluvium deposition. A model of slope evolution is provided, in which slope erosion progressively brings about more channelling and causes greater surface roughness because of the exhumation of more core stones and differentially weathered rock. This roughness causes increased edge abrasion.  相似文献   

A generalized probabilistic approach for slope analysis: practical application to an open pit iron ore mine     

D. S. Young 《Geotechnical and Geological Engineering》1986,4(1):3-13

Summary An example of the generalized probabilistic approach to slope analysis is given through a case study on an iron ore mine. A step by step engineering procedure is described, so that a practical application can be made to other structures under different field conditions.  相似文献   

Surface sealing as influenced by slope angle and position of simulated stones in the top layer of loose sediments   总被引：1，自引：0，他引：1  

Jean Poesen 《地球表面变化过程与地形》1986,11(1):1-10

The influence of five different slope angles and two different positions of simulated stones in the top layer of a sandy and a silty sediment on surface sealing intensity is examined in the laboratory. Sealing intensity is assessed by studying changes of percolation rate through a sediment layer with simulated rainfall duration and by measuring cohesion of the 5 mm thick upper sediment layer, a measure of seal strength, by means of a torvane. Slope has a negative influence on sealing intensity. For a constant per cent of simulated stone cover, sealing intensity is lowest in the case of stones placed on the sediment surface compared to the case of stones pushed into the surface layer. Explanations for these findings are given and some implications are further discussed.  相似文献   

The influence of weathering on the geotechnical properties and slope angles of mudstone in the Mineoka earth-slide area,Japan   总被引：1，自引：0，他引：1  

Yukinori Matsukura  Keiji Mizuno 《地球表面变化过程与地形》1986,11(3):263-273

Three active earth-slide slopes of Tertiary mudstone were investigated: Slope 1 has an angle of 17 ?4°, Slope 2 of 12.9°, and Slope 3 of 11.6°. Infinite slope analysis indicated that the instability of these three slopes can be well explained by using the residual strength parameters of earth-slide soils near the sliding surface in conjunction with the highest ground water table. The residual angle of shearing resistance, ø'_r, plays an important role in the determination of slope angle because it differs greatly among slopes. Mineralogical studies and X-ray diffraction analyses were performed for the clay minerals included in the slope material. The results showed that illite and chlorite were found in Slope 1, and also in Slopes 2 and 3 together with interstratified illite/montmorillonite and montmorillonite. The degree of weathering is progressive in order of Slopes 1, 2 and 3. The alteration of clay minerals by weathering causes the reduction in ø'_r -values, i.e., 19.4° in Slope 1 (steep, less weathered) and 12.1-9.2° in Slopes 2 and 3 (gentle, much more weathered). This result indicates that the degree of weathering has a great influence on the value of ø'_r, which in turn determines the slope angle.  相似文献   

可变网格的有限单元分析在边坡稳定计算中的应用   总被引：3，自引：0，他引：3  

刘钧  张炜 《工程地质学报》1995,3(2):54-59

本文在非线性有限单元法的基础上，引进八节点的狭长单元来描述边坡中的滑动面，同时对于有限元单元网格可调节点坐标进行变更形成新的网格，于是利用原有基本网格架，通过多次有限元分析求出边坡中可能滑动面的稳定系数曲线Ｋ＝ｆ（），并进而确定最危险的滑动面，在此基础上开展一系列稳定分析工作。  相似文献   

成层介质中交流电测井响应   总被引：27，自引：10，他引：27       下载免费PDF全文

张庚骥  汪涵明 《地球物理学报》1995,38(6):840-849

本文给出了纵向成层、径向不均匀介质中轴对称电磁波的反射阵和透射阵的递推公式．用这些阵可以计算交流电测并响应，包括感应测并和深探测电磁波传播测井（ＤＰＴ）．同时还给出了幅度基函数和斜度基函数，它们分别＂支撑＂起结点上函数的幅度和斜度．  相似文献   

Suction-controlled triaxial testing: Laboratory procedures in relation to resistance envelope methods     

M. G. Anderson  M. J. Kemp 《地球表面变化过程与地形》1987,12(6):649-654

In certain tropical slopes it appears possible that soil suction may play a significant role in maintaining stability. This communication outlines a laboratory suction-controlled triaxial test that can be undertaken to validate the threshold suction predicted by resistance envelope methods. It is shown that for two sites examined in St. Lucia, West Indies, the results from such a test confirm results obtained by use of resistance envelopes.  相似文献