【Daily Discussion】Public Utilities – Water Resources and Hydropower – 20210408

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability fall into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

Calculation methods for shear strength using formulas and calculation methods for shear failure using formulas. The shear strength analysis method treats the interface between the dam body and the bedrock as a contact surface rather than a bonded surface, in order to assess its sliding stability and ensure compliance with the safety requirements regarding sliding stability specified in the codes. This method is suitable for the anti-sliding stability analysis of medium and low dams in small and medium-sized projects. When there are no weak structural planes within the dam foundation that could cause sliding along the rock of the foundation, the safety factor for the anti-sliding stability of the dam foundation surface should be calculated using the shear strength formula. This method assumes that the dam is well bonded to the bedrock, and that the forces resisting sliding on the sliding surface include shear friction and shear cohesion; the shear strength parameters f’ and C are determined directly through shear tests on the bonding surface

Calculation methods for shear strength using formulas and calculation methods for shear failure using formulas.  The shear strength analysis method treats the interface between the dam body and the bedrock as a contact surface rather than a bonded surface, in order to assess its anti-sliding stability and ensure compliance with the safety requirements regarding anti-sliding stability specified in the codes. This method is suitable for the anti-sliding stability analysis of medium and low dams in small and medium-sized projects. When there are no weak structural planes within the dam foundation that could cause sliding along the rock of the foundation, the safety factor for the anti-sliding stability of the dam foundation surface should be calculated using the shear strength formula. This method assumes that the dam is well bonded to the bedrock, and that the forces resisting sliding on the sliding surface include shear friction and shear cohesion; the shear strength parameters f′ and C′ are determined directly through shear tests on the bonding surface.

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability are divided into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability fall into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability are divided into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability fall into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

Calculation methods for shear strength using formulas and calculation methods for shear failure using formulas. The shear strength analysis method treats the interface between the dam body and the bedrock as a contact surface rather than a bonded surface, in order to assess its anti-sliding stability and ensure compliance with the safety requirements regarding anti-sliding stability specified in the codes. This method is suitable for the anti-sliding stability analysis of medium and low dams in small and medium-sized projects. ? ???When there are no weak structural planes within the dam foundation that could cause sliding along the rock of the foundation, the safety factor for anti-sliding stability of the dam foundation surface should be calculated using the shear strength formula. This method assumes that the dam is well bonded to the bedrock, and that the forces resisting sliding on the sliding surface include shear friction and shear cohesion; the shear strength parameters f’ and C are determined directly through shear tests on the bonding surface

The stability of a slope is usually expressed as the ratio of the resisting force (Fs) on the sliding surface to the sliding force (Fr), that is, the resistance stability coefficient (η). The larger this ratio, the more stable the slope is ； Conversely, the slope is less stable. The common methods for evaluating slope stability are divided into the following 4 categories: ① Qualitative analysis methods. By studying the dimensions and slope shape of the slope, its geological structure, the geological environment in which it is located, its geological history of formation, signs of deformation and failure, as well as various factors affecting its stability, it is possible to determine the evolution stage and stability condition of the slope. ②Limit equilibrium analysis method. The rock and soil masses that may slide are assumed to be rigid bodies. By analyzing the possible sliding surfaces and simplifying the stresses on those surfaces as uniformly distributed, the stability coefficient of the slope is calculated. ③Numerical analysis method. Using the finite element analysis method, the slope displacement field and stress field are first calculated, and then, based on the strength criteria for rocks and soils, the stability coefficients of each element relative to the possible sliding planes are determined. ④Engineering geological analogy method. An analogy is drawn between the slope under study or the artificial slope to be designed and slopes that have been studied or for which there is existing experience, in order to evaluate its stability and determine reasonable slope heights and angles.

Calculation methods for shear strength formulas and calculation methods for shear failure formulas