scholarly journals Stability of Soil Cutting and Side Slope Based on Stress Route Theory

2015 ◽  
Vol 2 ◽  
pp. 1
Author(s):  
Zhaohong Ji
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Effective Stress ◽  
Analytical Method ◽  
Soil Slope ◽  
Safety Coefficient ◽  
Side Slope ◽  
Stress Changes ◽  
Soil Cutting ◽  
The Impact

<p>The stress route analytical method compensates for the limitation of traditional soil slope stability analytical method. Since it disregards the impact of effective stress route on the stress status and anti-shear strength of soil slope, it maps out the soil stress route drawing in the excavation process, and marks the anti-shear strength and shear stress changes under various conditions of soil. It causes the changes of the safety coefficient rules in the excavation of soil slope and affects the excavation stability of soil cutting and side slope. The result reveals: (1) The main analytical method of side slope stability which covers both the limit balance method and finite unit method fails to consider the impact of effective stress route on the existing stress status and anti-shear strength of soil slope; the stress route analytical method is able to overcome this limitation to a certain degree. (2) The stress route theory is adopted for analysis, in which, it can projected the whole stress of typical and most dangerous area of the slope, able to analyse the anti-shear strength of soil in a real-time manner, manage to express the safety coefficient changes in the stress route drawing and provides a selection of a suitable excavation plan by contrast. (3) In the overall excavation, the slope toe suffers from obvious stress concentration which expands to the surrounding areas and inconvenient for the side slope stability in the excavation.</p>

Slope Stability Analysis under the Condition of Seepage

2012 ◽  
Vol 204-208 ◽  
pp. 241-245
Author(s):  
Yang Jin
Keyword(s):  
Finite Element Method ◽  
Shear Strength ◽  
Slope Stability ◽  
Negative Impact ◽  
Strength Reduction ◽  
Soil Slope ◽  
Failure State ◽  
Calculation Results ◽  
The Stability ◽  
Shear Strength Reduction

The stability of soil slope under seepage is calculated and analyzed by using finite element method based on the technique of shear strength reduction. When the condition of seepage or not is considered respectively, the critical failure state of slopes and corresponding safety coefficients can be determined by the numerical analysis and calculation. Besides, through analyzing and comparing the calculation results, it shows that seepage has a negative impact on slope stability.

scholarly journals The Impact of surface perturbations on snow-slope stability

1998 ◽  
Vol 26 ◽  
pp. 307-312 ◽  
Author(s):  
H. Conway
Keyword(s):  
Shear Stress ◽  
Shear Strength ◽  
Slope Stability ◽  
Crack Growth ◽  
Basal Layer ◽  
Field Measurements ◽  
Critical Crack ◽  
Small Surface ◽  
Weak Layer ◽  
The Impact

Measurements and observations by others indicate that a potential slab avalanche consists of a relatively cohesive slab of snow overlying a thin weak layer that coniains flaws where locally the shear stress from the overburden is not fully supported. Under favorable conditions, snow will shear strain-soften, which provides the basis for applying a slip-weakening model to examine the size of flaw needed to initiate sub-critical crack propagation along the weak layer. Using typical values for snow properties, the model predicts sub-critical crack growth can initiate from a relatively small flaw well before the shear stress from the overburden approaches the peak shear strength at tin-bed. The occurrence of small flaws or imperfections in the basal layer would explain field measurements which usually indicate that avalanching occurs before the applied shear stress exceeds the shear strength at the basal layer.Widespread slab-avalanche activity often increases significantly soon after the onset of rain on new snow. Measurements of temperature and mechanical properties show that only the upper 0.15 m or less of the slab has been altered at the time of avalanching; alterations at the sliding layer have not yet been detected. Results from the slip-weakening model indicate that the rain-induced alterations would reduce the size of flaw needed to initiate sub-critical crack growth by 10–20%. The observations and model results show clearly the importance of the slab properties; it is evident that both the slab and the weak layer act together to control slope stability. A further implication is that the stability of freshly deposited snow is often close to critical, because a relatively small surface perturbation is often sufficient to cause avalanching. This is not surprising, because it is well known from field observations that new snow on slopes should be treated with caution.

Study on Protection Measures of Highway Cutting Soil Slope in Seasonal Frozen Regions

2013 ◽  
Vol 477-478 ◽  
pp. 431-434
Author(s):  
He Wu ◽  
Wen Chong Yu ◽  
Qi Ge ◽  
Guo Feng Wang ◽  
Yi Qi Wang
Keyword(s):  
Theoretical Model ◽  
Influencing Factors ◽  
Saturated Soil ◽  
Soil Stability ◽  
Soil Slope ◽  
Protection Measures ◽  
Side Slope ◽  
Model Form ◽  
Melting Period ◽  
Soil Cutting

The main causes and influencing factors of artificial side soil slope slide of soil-cutting in seasonal frozen area are analyzed and put forward, and a mechanical theoretical model form is also put forward. Based on checking computation of artificial side slope saturated soil stability in melting period, it provides effective measures by adopting drainage to stabilize side slope instead of cutting it to keep soil-cutting side slope stable in the seasonal frozen area. Then the comprehensive stability technology of side slope by introducing geotextile as lower levels drainage and by adopting net geotextile lattice to stabilize soil and planting Malian grass.

Real-Time Monitor Method of Soil Slope Stability in Seasonal Frozen Area

2013 ◽  
Vol 303-306 ◽  
pp. 777-781
Author(s):  
Ping Jiang ◽  
Meng Su Zhang
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Real Time ◽  
Evaluation System ◽  
Landslide Hazard ◽  
Soil Slope ◽  
Freezing And Thawing ◽  
The Neural Network ◽  
Neural Network Algorithm ◽  
Freezing And Thawing Cycles

Soil slope in seasonal frozen area subject to rainfall or freezing and thawing cycles, the shear strength of soil damage and lead to landslide hazard. In order to predict the landslide hazard through monitoring the soil slope stability real-time, the soil slope stability evaluation system is established. The Neural Network Algorithm can simulate elastic-plastic finite element method well, and using Genetic Algorithm to search cohesion(c) and internal friction angel(φ) which meet the accuracy requirements. And the intelligent parameter inversion model of soil shear strength (c, φ) based on displacement is established. So, the slope stability can be evaluated real –time based on displacement monitor. Application of this method in actual project shows that this method is accurate and effective.

The Stability Studies of Soil Slope under the Action of Short-Time Heavy Rainfall

2012 ◽  
Vol 170-173 ◽  
pp. 1192-1195
Author(s):  
Zhong Ming He ◽  
Xin Tong Zhao ◽  
Ling Zeng ◽  
Yan Qi Qin
Keyword(s):  
Shear Strength ◽  
Heavy Rainfall ◽  
Soil Slope ◽  
Soil Matrix ◽  
Water Load ◽  
Safety Coefficient ◽  
Rainwater Infiltration ◽  
Matrix Suction ◽  
Short Time ◽  
Slope Safety

Based on the saturated-unsaturated seepage theory and the unsaturated shear strength, the numerical simulations of soil slope seepage field in short-time heavy rainfall was carried out, and on this basis calculated the slope safety coefficient at different rainfall time. The research shows that: the rainfall infiltration will cause the slope soil matrix suction decreased or even disappeared which leads to the slope shear strength reduce; Rainwater infiltration increases the transient water load of infiltration area; and under the dual role of matrix suction reduction and transient water load increasing, the slope safety coefficient has the downward trend obviously.

scholarly journals Effect of soil water saturation on slope stability: Tomsk case study

2019 ◽  
Vol 98 ◽  
pp. 05005 ◽  
Author(s):  
Natalia Brakorenko ◽  
Anna Leonova ◽  
Aleksey Nikitenkov
Keyword(s):  
Shear Strength ◽  
Slope Stability ◽  
Soil Water ◽  
Water Saturation ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
A Site ◽  
The Impact ◽  
Soil Water Saturation

We investigate in this article the impact of soil water saturation on the slope stability, using a site in Tomsk city as a case study. The dependency of the shear strength parameters of soil on the degree of soil water saturation has been demonstrated. The paper also provides equations for the calculation of slope stability coefficient under different values of soil water saturation.

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