Survey and research frame for ground sediment

Huang

2022

Materials

Self Cite

The particle discrete element method (PDEM) is widely used to simulate rock and soil materials to obtain stress and strain. However, there are three shortcomings: (1) Single sphere or ellipsoids directly replace the soil particles; (2) it treats the diameters of spheres or ellipsoids as the soil particle size; (3) the overlapping particle volume is not deducted in calculating the porosity. Hence, it is difficult for the simulation of the geological body to agree with reality. This research found a rotation calculation model and a pixel counting method to make joint soil particles more accurately simulate geological materials to solve the three shortcomings. The model successfully obtained the gradation curve and porosity of the simulated geological body with joint particles. This research will further enrich and broaden the application prospects of PDEM and provide a reference for scientific research and engineering fields in geological engineering, geotechnical engineering, and petroleum engineering.

Section: Discussionmentioning

confidence: 99%

Modeling the Simultaneous Effects of Particle Size and Porosity in Simulating Geo-Materials

Huang

2022

Materials

Self Cite

“…The sediment particles in a fissure can be called the underground sediment. The sediment composed of soil particles from the interior of soils 2,3 , rock fissures, porous soils 4 , riverbanks and some other sources constitutes underground sediment. Silt and scour may be created during the movement of underground sands, which block and dredge fissures 5 .…”

Section: Introductionmentioning

confidence: 99%

“…The ground sediment is driven by groundwater, which potentially causes many hazards. If the ground sediment is fully considered and closely connected with the geological material, many geologic hazards, such as collapse of riverbanks and blockage of groundwater and oil fissures 2 , could be better handled. If the sediment particles are very hard at this time, while the soil and the rock are very soft, it will appear that the sediment particles squeeze both sides of the rock and soils.…”

Section: Introductionmentioning

confidence: 99%

Hard particle force in a soft fracture

2019

Sci Rep

Self Cite

The fissure patency of a rock mass is an important factor contributing towards the fluid production efficiency. Debris particles generated by the crushing of rock masses or other external forces can cause blockage or promote the smoothness of rock fractures. It is of immense theoretical and engineering value to analyze the mechanics of particles in rock fissures, especially under the compression of rock from both sides. In this study, through static analysis, the resultant force of particles in rock fissures is extruded by rock on both sides. The following conclusions are drawn: The resultant force increases first and then decrease with the increase of fissure angle and width when x is constant. The extreme point is at sin θ = R /(3 x ), h = 2 R (9 x 2 − R 2 ) 0.5 /(9 x ) and the maximum of F is 8 πkR 4 /(27 x ). Whereas, the bigger the joint roughness coefficient ( JRC ) of fissure is, the larger the average of fissure open angle is and the larger the average width is. As the JRC increases, the average resultant force decreases. The sharp point at the turning point of the fissure is easily broken, and the fissure width becomes larger, which makes the resultant force decrease. The analysis process expands the application prospects of the JRC . The results help to better understand the blockage and transport of particles in rock fissures.

“…Landslide can cause secondary damage, rockslide-dammed lakes [3][4], tsunamis [5][6][7], and block roads [8]. There are so many factors leading to landslides, such as hydrology [9], earthquakes, top loads, pedology, different layers, geomorphy [10], and geology-changing climate [11].A slope consists of soil and rock. Previous research treated geomaterials as homogeneous materials and did not separate soils and rock.…”

mentioning

confidence: 99%

Stability and Support Analysis of Coverage Rock-Soil Aggregate of Longhuguan Landslide

Fu-hua

2017

Pol. J. Environ. Stud.

Self Cite

Landslides have an effect on lives and properties in many different countries [1], making control of the effects of natural hazards -especially landslides -an urgent problem [2]. Landslide can cause secondary damage, rockslide-dammed lakes [3][4], tsunamis [5][6][7], and block roads [8]. There are so many factors leading to landslides, such as hydrology [9], earthquakes, top loads, pedology, different layers, geomorphy [10], and geology-changing climate [11].A slope consists of soil and rock. Previous research treated geomaterials as homogeneous materials and did not separate soils and rock. Different geomaterials have different affects on slope stability. Mahmood and Kim [12] analyzed the effect of soil type on matric suction and stability of unsaturated slope, using the modified MohrCoulomb failure criterion and the saturated-unsaturated seepage model, and drew upon the fact that saturatedunsaturated hydraulic conductivity and matric suction head affect the matric suction results. Tiwari and Ajmera Pol. J. Environ. Stud. Vol. 26, No. 6 (2017), 2747-2757 AbstractRock-soil aggregate landslides are distributed all over the world and have done great harm to transportation networks, buildings, personal safety, and city construction. Although landslide studies usually focus on the slope of the single homogeneous material, few slopes are composed of or covered by various complicated geomaterials. This paper proposes a calculation model of the slope covered by rock-soil aggregate and analyzes Longhuguan landslide in Guangxi, China, considering rainfall. Fully considering the weak surface, a support design plan is given.The unbonded cable is taken to support the landslide, the concrete beams are adopted on the angle turning point of the surface, and the slide-resistant piles are used to jointly support the front edge of the slope. Top fissures are blocked and landslide drainage measures are taken. The displacement monitoring proves that the support is effective. This study can provide many references for landslide support and analysis covered by rock-soil aggregate.