We analyze theoretically the dynamics of aeolian sand ripples. In order to put the study in the context we first review existing models. This paper is a continuation of two previous papers[3, 4], the first one is based on symmetries and the second on a hydrodynamical model. We show how the hydrodynamical model may be modified to recover the missing terms that are dictated by symmetries. The sym...

Butadiene-styrene copolymer (SBR) is an elastomer composed of 75% butadiene and 25% styrene widely used in the automotive industry tire production. This can be produced from two polymerization processes: emulsion or solution polymerization. paper presents mechanical behavior a polymer reinforced sand compared to pure sand. Direct shear tests were performed on specimens with addition modified bu...

This paper proposed an MSC-Transformer model based on the Transformer’s neural network, which was applied to seabed sediment classification. The data came from about 2900 km2 of area northern slope South China Sea. Using submarine backscattering intensity and depth obtained by sub-bottom profiler, combined with latitude longitude information, a dataset Sea constructed. Moreover, using MSC-Trans...

Land leveling is one of the most important steps in soil preparation and cultivation. Although land leveling with machines requires considerable amount of energy, it delivers a suitable surface slope with minimal soil deterioration as well as damage to plants and other organisms in the soil. Notwithstanding, in recent years researchers have tried to reduce fossil fuel consumption and its delete...

Undrained instability is a failure mode that has been observed in many sandy slopes. However, the highly anisotropic stress states caused by geometry of slope have not duly considered from experimental point view. This article studies influence initial anisotropy laboratory samples on static undrained Colombian reference sand. Forty-five consolidated triaxial tests were performed, prescribing c...

Two dimensional slope profile morphometric investigation in a part of the land failure prone Garhwal region of the Lesser Himalaya, Tehri district, U. P., India, indicates that the landslip morphology is closely related to the dominant movement processes active in this terrain. Technique developed for the morphometric analysis of landslips involves the use of five morphometric indices. Each ind...

The finite element technique has been accepted as a tool for modeling geotechnical complex processes. In this study, (FE) of various stages the soil-nailing process, i.e., construction and overburden pressure stages, is carried out considering different soil parameters, simulating with in-house developed laboratory models. process built in models idealized plain strain problem modeled PLAXIS so...

Abstract A number of discrete element analyses undrained triaxial shear tests on crushable assemblies are performed using 3-dimensional particle flow code (PFC3D). The the samples is simulated by assigning different velocities at boundaries to control constant volume during shear. Particle breakage studied octahedral stress criterion and fragment spawning mode satisfying an Apollonian sphere pa...

Saltation is an important geological process and the primary source of atmospheric mineral dust aerosols. Unfortunately, no studies to date have been able to precisely reproduce the saltation process because of the simplified theoretical models used. For example, sand particles in most of the existing wind sand movement models are considered to be spherical, the effects of the sand shape on the...

Introduction: The north polar sand sea of Mars is the type locality for the silca-rich TES Surface Type 2 (ST2) unit [1], but the nature of ST2 is not well constrained. Possible compositions for ST2 include highSi volcanic glass, zeolites, and high-Si amorphous phases [1-4]. As no major volcanic edifices have been conclusively identified in the north polar region (NPR), it has been suggested th...