Abstract
The angle of repose in soil particles plays a key role in slope stability. There was a need for the investigation on the association between the angle of repose in loess particles and the angle of slopes. The fixed funnel methods with different particle sizes were carried out. The pressure of particle gravity weight was obtained based on the vibration stacking test. Four contact structures in loess particles were put forward including the triangular pyramid contact structure (TS), rectangular pyramid contact structure (RS), pentagonal pyramid contact structure (PS), and hexagon contact structure (HS). The particles transformed successively in four kinds of contact structures. The transformation of entropy value of the particles in different accumulation areas was discussed during the process of accumulation. The relationship between the natural angle of repose and the evolution of the contact structures was established. Combined with the existing experimental conclusion that loess particles transform in four stable states, in turn, the reason that the friction angle of uniform sand particles proposed by Shields in 1936 is 33° was explained. The formation theory of the loess angle of repose was well extended to speculate the formation process of the loess slope system. It is verified that loess slopes were mainly distributed under 30°.
Highlights
Loess, as a special sedimentary product of the Quaternary, has a very wide distribution
The accumulation body before and after vibration has the same change trend. Based on all those data, the angle of repose of the accumulation body is inversely proportional to the particle size
A principle about the accumulation of friable deposits until the generation of their angle of repose is proposed from the perspective of particles
Summary
As a special sedimentary product of the Quaternary, has a very wide distribution. As the threshold angle for the accumulation body to maintain its stability, the angle of repose has a controlling effect on the loess slope which is considered as large deposition. The fixed funnel method and vibration stacking test are used to prove the rationality of the contact models directly and describe the contact transformation of granular particles during the accumulation process. The main purpose of this test is to simulate the transformation of particles’ contact structure under the conditions of deposition and accumulation and to measure the angle of repose of the accumulation body. After the completion of the fixed funnel method test, the experimenter can observe the transformation of particle contact structure inside the accumulation body through the transparent separator. The vibration frequency and strength can be controlled by using a VT 700 vibration table
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call