Study on Consolidation Mechanism of Debris Flow Deposit

2012 ◽  
Vol 446-449 ◽  
pp. 1674-1684
Author(s):  
Hong Kai Chen ◽  
Xiao Ying He ◽  
Ying Zhong ◽  
Hong Mei Tang
Keyword(s):  
Debris Flow ◽  
Field Survey ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Two Phase ◽  
One Dimensional ◽  
Debris Flow Deposit ◽  
Flow Deposit ◽  
Consolidation Degree ◽  
Consolidation Time

The damage of debris flow effected on highway subgrade, pavement, protective structure, bridge and culvert laid on debris flow impact fracture and buried damage. Thus far, research on debris flow burying mechanism is still fuzzy. According to the two-phase flow theory of debris flow deposit, analyzed the consolidation mechanical mechanism of highway debris flow deposit. On the basis of Terzaghi one-dimensional consolidation theory, established the consolidation formula, which described the change process of excess pore water pressure, consolidation degree, settlement and compression with the consolidation time and deposit size, and then verified the correctness and feasibility of the formula by the indoor consolidation test. It adopted these results and combined it with the field survey data, it could develop a proper program for emergency mitigation of highway debris flow buried disaster more quickly and accurately.

scholarly journals Numerical Simulation of Consolidation Characteristics of Diluted Debris Flow

2021 ◽  
Author(s):  
Danyi Shen ◽  
Zhenming Shi ◽  
Hongchao Zheng
Keyword(s):  
Debris Flow ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Reverse Direction ◽  
High Concentration ◽  
Two Phase ◽  
Consolidation Process ◽  
Graded Materials ◽  
Consolidation Settlement ◽  
Graded Material

The consolidation settlement of diluted debris flow is a complicated process of solid-liquid two-phase flow deposition. In this paper, the consolidation and settlement characteristics of uniform-graded and wide-graded debris flow materials in clear water and slurry are simulated by using this method. The results show that in the process of consolidation, sorting occurs in the top and middle position of uniform-graded materials at low concentration, while the middle particles are separated in reverse direction at high concentration. The middle particles of wide-graded material are hardly separated in the whole consolidation process. The velocity of dissipation of excess pore water pressure in the clean water is faster than that of slurry, and the dissipation time of wide-graded materials is longer than that of uniform-graded materials. The research results are helpful to reveal the mechanism of consolidation settlement of diluted debris flow in meso-scale.

One-dimensional consolidation under general time-dependent loading

2006 ◽  
Vol 43 (11) ◽  
pp. 1107-1116 ◽  
Author(s):  
Enrico Conte ◽  
Antonello Troncone
Keyword(s):  
Fourier Series ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Simple Calculation ◽  
Time Dependent ◽  
Coefficient Of Consolidation ◽  
One Dimensional ◽  
Practical Applications ◽  
Consolidation Time ◽  
General Time

This paper presents an analytical solution for the analysis of one-dimensional consolidation of saturated soil layers subjected to general time-dependent loading. A simple calculation procedure that makes use of the Fourier series is proposed for practical applications. Both single loads and cyclic loads can be considered by choosing a suitable period for the Fourier series. A number of comparisons with existing theoretical solutions are shown to assess the accuracy of the proposed procedure. Moreover, the experimental results from oedometer tests performed in the present study and from a well-documented case history concerning a large embankment constructed on compressible soils are analysed using this solution to evaluate the coefficient of consolidation of the soil.Key words: one-dimensional consolidation, time-dependent loading, excess pore-water pressure, theoretical solution, Fourier series.

Study on Artificial Island Ground Improvement Method and Effect

2014 ◽  
Vol 1030-1032 ◽  
pp. 1037-1040
Author(s):  
Jin Fang Hou ◽  
Ju Chen ◽  
Jian Yu
Keyword(s):  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Improvement ◽  
Soft Soil ◽  
Horizontal Displacement ◽  
Treatment Method ◽  
Surcharge Preloading ◽  
Porosity Ratio ◽  
Improvement Method ◽  
Consolidation Degree

The artificial island ground on an open sea is covered by thick soft soil. It must be improved before using. In accordance with a designing scheme, the ground treatment method is inserting drain boards on land and jointed dewatering surcharge preloading, the residual settlement is not more than 30cm after improvement and the average consolidation degree is more than 85%. In order to estimate ground improvement effect and construction safety, instruments are buried to monitor the whole ground improving processes. By monitoring settlement and pore water pressure, it is shown that the total ground settlement in construction is 2234mm, its final settlement is 2464mm, and consolidation degree and residual settlement respectively satisfy requirements. In ground improvement, horizontal displacement is small and construction is safe. Meanwhile, the results of soil properties and vane shear strength detection tests show the soft soil ground is greatly reduced in water content and porosity ratio, and improved in strength. It is named that the ground improvement method is reasonable and reaches expected effect.

One-dimensional consolidation of multilayered aquifer systems with viscoelastic properties induced by time-dependent groundwater drawdown

2021 ◽  
pp. qjegh2021-073
Author(s):  
Weitao Yang ◽  
Jin Xu
Keyword(s):  
Viscoelastic Properties ◽  
Numerical Solutions ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Time Dependent ◽  
Analytical Models ◽  
Consolidation Process ◽  
One Dimensional ◽  
Groundwater Drawdown ◽  
Aquifer Systems

Most analytical and semi-analytical models for pumping-induced land subsidence invoke the simplifying assumptions regarding characteristics of geomaterials, as well as the pattern of drawdown response to pumping. This paper presents an analytical solution for one-dimensional consolidation of the multilayered soil due to groundwater drawdown, in which viscoelastic property and time-dependent drawdown are taken into account. The presented solution is developed by using the boundary transformation techniques. The validity of the proposed solution is verified by comparing with a degenerated case for a single layer, as well as with the numerical solutions and experimental results for a two-layer system. The difference between the average consolidation degree Up defined by hydraulic head and that Us defined by total settlement is discussed. The detailed parametric studies are conducted to reveal the effects of viscoelastic properties and drawdown patterns on the consolidation process. It is revealed that while the effect of different drawdown response patterns is significant during the early-intermediate stages of consolidation, the viscoelastic properties may have a more dominant influence on long-term consolidation behavior, depending on the values of the material parameters, which are reflected in both the deformation process of soil layers and the dissipation of excess pore-water pressure.

Huge, CO2-charged debris-flow deposit and tectonic sagging in the northern plains of Mars

Geology ◽  
2001 ◽  
Vol 29 (5) ◽  
pp. 427 ◽  
Author(s):  
Kenneth L. Tanaka ◽  
W. Bruce Banerdt ◽  
Jeffrey S. Kargel ◽  
Nick Hoffman
Keyword(s):  
Debris Flow ◽  
Northern Plains ◽  
Debris Flow Deposit ◽  
Flow Deposit
Sign in / Sign up

Export Citation Format

Share Document