Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

Huang, Xianwen; Zhou, Aizhao; Wang, Wei; Jiang, Pengming

doi:10.3390/su12041616

Cited by 11 publications

(9 citation statements)

References 38 publications

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“…Scanning by X-ray [4,43] can identify the internal characteristics of the rocks inside the slope without damage. On the basis of scanning images, the rocks' and cracks' locations in soil-rock mixtures are obtained directly, which is meaningful for evaluating the mechanical properties of soil-rock mixtures and establishing soil-rock slope models.…”

Section: Discussion About Characteristic Parameters Of the Soil-rock mentioning

confidence: 99%

A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

Zhou

Huang

et al. 2020

Symmetry

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A soil–rock slope is a heterogeneous slope composed of soil and rocks that is widely distributed throughout the world. In order to accurately analyze the slope stability of soil–rock mixture, based on a Monte Carlo algorithm (fuzzy-based method), a symmetrical stability analyzing method for soil–rock slopes is proposed, considering the dispersion of strength of soil–rock mixtures. In analyzing it, the numerical model is symmetrical to the real soil–rock slope in geometry and material properties. In addition, the effect of rock content to slope stability was studied by this symmetrical method. The specific work of this paper is as follows: (1) The acquisition method of random number series for the Monte Carlo algorithm and the method of slope stability analysis, using the Monte Carlo method, are introduced. (2) According to in situ samples and remade samples, the strength characteristics of soil–rock mixtures were measured with different rock contents, which proved the scatter of strength of soil–rock mixtures. (3) Based on the measured strength parameters of soil–rock mixtures and the slope landslide, the reliability in analyzing results and superiority in calculating time of using the Monte Carlo method to analyze stability of soil–rock slopes are detailed. (4) The stability of soil–rock slopes with different rock content is discussed with the Monte Carlo method, and it is concluded that with the increase of rock content, the stability of a soil–rock slope decreases first and then increases, and the minimum safety factor is acquired at 20% rock content. (5) Based on a large number of calculation examples, the applied situations of the Monte Carlo method to analyze stability of soil–rock slopes are detailed according to sampling results and rock size.

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Section: Discussion About Characteristic Parameters Of the Soil-rock mentioning

confidence: 99%

A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

Zhou

Huang

et al. 2020

Symmetry

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“…Hence, suitable rock size is important in the analysis of soil-rock mixtures. According to the sample preparation standard (GB/T 50123-1999) and existed references [1,33,34], Kalender et al [2,8,35,36] concluded that, in soil-rock mixtures, minimum thresholds for soil and rock are suggested to be the minimum value of 2 mm and 0.05 Lc (where Lc is the characteristic length of model), and maximum thresholds are advised to be 0.2 Lc. Based on the advice, Zhang et al [1] conducted triaxial tests with soil-rock mixtures containing 2-10 mm rocks (samples are 50 mm in diameter and 100 mm in height) and obtained good experimental results.…”

Section: Size Characteristic Of Rocksmentioning

confidence: 99%

“…For better analysis of rock distribution characteristics in soil-rock slopes, 6 groups of soil-rock mixture samples were made consisting of different rock shapes (angular and round) and contents (10%, 30%, and 60%). e specimens were cylindrical in shape with diameter 50 mm and height 100 mm and each layer was compacted 20 [1,34,38], rock size in specimen was defined to be between 2 and 10 mm. CT [39] is a good method to observe the internal structures of objects without any disturbance and has been widely utilized in medicine and engineering.…”

Section: Rock Distribution Characteristics In Soil-rock Mixturesmentioning

confidence: 99%

Soil‐Rock Slope Stability Analysis under Top Loading considering the Nonuniformity of Rocks

Huang

Yao

Wang

et al. 2020

Advances in Civil Engineering

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Soil-rock slopes are widely distributed in central or western China. With the development of transportation, many subgrades are being built on mountainsides and therefore, slope stability has to be estimated under high loadings. To obtain better estimation results, a new rock contour establishing algorithm was developed, capable of considering interlock effect between rocks. Then, computed tomography (CT) and unconfined triaxial tests with ring top loadings were conducted. Based on rock distribution characteristics (obtained by CT photos) and the appearance of shear failure surfaces in slopes under ring top loadings, four rock skeleton status and five shear failure surface developing models were introduced. Based on the developed rock contour establishing algorithm, ten groups (twelve models per group) were established and calculated by finite element method (FEM). After this, normalized ultimate loading increasing multiple N, which was the ultimate loading ratio of rock-containing slope to uniform soil slope, was introduced to evaluate the influence of rock distributions on slope stability. The value of N was increased with the increase of rock content due to rock skeleton status. The values of N in slopes with angular rocks were about three times higher than those with round rocks which was due to complex geometric shape and distribution characteristics of angular rocks. Then, considering different slope angles (50°–60°), rock contents (0%–60%), and rock shapes (round and angular), the ultimate loading increasing multiple N of soil-rock slopes under high loadings was calculated and suggested for engineering designs. Finally, based on the failure surfaces of numerical modes, three typical failure modes were developed, which could be reference for designers to deal with slopes.

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“…In order to ensure a working energy supply, China's coal mining has been gradually promoted to the deep rock strata [1][2][3]. The process of deep coal resource mining will inevitably produce a large mining response.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Mechanical Properties of High Performance Hybrid Fiber Concrete for Shaft Lining

Zhang

et al. 2021

Applied Sciences

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In order to solve the problem of highly brittle shaft lining under dynamic loading, a combination of hybrid fiber concrete mixed with steel and polypropylene fiber is proposed to make shaft lining. C60, the concrete commonly used in shaft lining, was selected as the reference group. The static mechanical properties, dynamic mechanical properties, and crack failure characteristics of the hybrid fiber concrete were experimentally studied. The test results showed that compared to the reference group concrete, the compressive strength of the hybrid fiber-reinforced concrete did not significantly increase, but the splitting tensile strength increased by 60.4%. The split Hopkinson compression bar results showed that the optimal group peak stress and peak strain of the hybrid fiber concrete increased by 58.2% and 79.2%, respectively, and the dynamic toughness increased by 68.1%. The strain distribution before visible cracks was analyzed by the DIC technology. The results showed that the strain dispersion phenomenon of the fiber-reinforced concrete specimen was stronger than that of the reference group concrete. By comparing the crack failure forms of the specimens, it was found that compared to the reference group concrete, the fiber-reinforced concrete specimens showed the characteristics of continuous and slow ductile failure. The above results suggest that HFRC has significantly high dynamic splitting tensile strength and compressive deformation capacity, as well as a certain anti-disturbance effect. It is an excellent construction material for deep mines under complex working conditions.

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Characterization of the Dynamic Properties of Clay–Gravel Mixtures at Low Strain Level

Cited by 11 publications

References 38 publications

A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

A Monte Carlo Approach to Estimate the Stability of Soil–Rock Slopes Considering the Non-Uniformity of Materials

Soil‐Rock Slope Stability Analysis under Top Loading considering the Nonuniformity of Rocks

Experimental Study on Mechanical Properties of High Performance Hybrid Fiber Concrete for Shaft Lining

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