Earth flows; morphology, mobilization, and movement
Earth flows; morphology, mobilization, and movement
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地球流动；
DOI：
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发表时间：
1983
期刊：
影响因子：
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通讯作者：
Arvid M. Johnson
中科院分区：
文献类型：
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作者：
D. Keefer;Arvid M. Johnson
--1以前的研究--- -和地质在地球流发生的地区--------------------------------------------------------------流动形态-10地下特征：基底剪切面，侧向剪切面，- ----------------------------------------------- -- ---27地下几何形状-27研究活跃的地球流动和地下水条件197 4-78 - 28降水与活动和运动速率的相关性-继续研究活跃的地球流动和地下水状况，1974- 1978年----32含水量-32单位重量、孔隙比、和饱和度-1975年8月至1978年2月-用直接剪切试验------------------------------------------------ -43运动的地球流动模型-- -和边界粗糙度-----51结论-
------------------------------------------------------------------------1 I ntrod ucti on --------------------------------------------------------------------1 Previous studies -------------------------------------------------------2 Classification and terminology -------------------------------------4 Acknowledgments ------------------------------------------------------4 Earth-flow morphology, materials, and settings -------------------5 Topography, climate, and geology in areas of earth-flow occurrence ----------------------------------------------------------------5 San Francisco Bay region -------------------------------------5 Other regions ------------------------------------------------------8 Morphology -------------------------------------------------------------8 Idealized earth-flow morphology ----------------------------10 Subsurface features: Basal shear surfaces, lateral shear surfaces, and associated zones of deformation -------13 Earth-flow complexes ------------------------------------------------16 Materials -----------------------------------------------------------------17 The Davilla Hill earth-flow complex -----------------------------------22 Description ---------------------------------------------------------------22 Location and setting --------------------------------------------22 Morphology and history of movement --------------------24 Material -------------------------------------------------------------27 Subsurface geometry ------------------------------------------27 Studies of active earth flows and ground-water conditions, 197 4-78 ------------------------------------------------------------------28 Surface displacements ------------------------------------------28 Correlations of precipitation with mobilization and rate of movement ----------------------------------------------------29 Page The Davilla Hill earth-flow complex-Continued Studies of active earth flows and ground-water conditions, 1974-78--Continued Subsurface displacements -------------------------------------29 Water levels -------------------------------------------------------32 Water contents ---------------------------------------------------32 Unit weights, void ratios, and saturation ----------------33 Laboratory swell tests ------------------------------------------33 Piezometric and tensiometric measurements, August 1975-February 1978 ------------------------------------------36 Analysis of mobilization ----------------------------------------------38 Measurement of shear-strength parameters, using direct-shear tests ------------------------------------------------39 Slope-stability analysis of earth flows ---------------------40 Discussion ---------------------------------------------------------------41 A model for earth flow -----------------------------------------------------41 Earth-flow mobilization ----------------------------------------------43 Model of a moving earth flow --------------------------------------43 Velocity measurements ----------------------------------------43 Shear surfaces and adjacent zones of disturbance -----46 Distribution of displacements --------------------------------4 7 Surges ---------------------------------------------------------------4 7 Velocity, boundary slip, and boundary roughness -----48 Internal deformation --------------------------------------------51 Composite model -------------------------------------------------51 Conclusions ---------------------------------------------------------------------52 References cited --------------------------------------------------------------53