In this research, amino functional buffing dust (HBD) was used as an excellent biomass functional filler to improve the hygienic properties of synthetic leather, and provide a novel way for the treatment and disposal of leather buffing waste.
The slope reinforcement scheme has an important influence on the prevention and control of landslides. A reasonable reinforcement scheme can improve the reliability, economy and efficiency of landslide resistance. It is urgent to establish a local precise reinforcement method for landslides on the basis of clear process and the instability modes of landslides. Taking a high-steep anti-dip rock slope as an example, six numerical models are established by using the continuum–discontinuum element method (CDEM) to carry out seismic damage and dynamic analysis of slopes. By comparing the seismic response and damage characteristics of being unstrengthened, local precise reinforcement and overall reinforcement models, the applicability of the proposed local precise reinforcement method for the slopes is discussed. The results show that the determination of the dynamic amplifying effect and seismic damage characteristics of slopes is the primary prerequisite of the local precise reinforcement method. The dynamic amplification effect of the slope toe, crest and shallow slope surface are much larger, that is, they are the potential reinforcement areas. The local precision reinforcement times should be controlled within a certain number of times, and the slope after the first three times of the local reinforcement effect is the best. However, more than three times after the reinforcement effect it becomes worse. Moreover, the dynamic amplification effect, the equivalent crack ratio and the mechanical energy of the slope after three times of local precision reinforcement are similar to the overall reinforcement effect, which indicates that local precision reinforcement has good feasibility. This work can provide references for landslide disasters prevention and control.
The occurrence of geological structure and stratum lithology plays important roles in the seismic stability of complex slopes, which is also the di cult points of engineering construction. Four three-dimensional layered granite slope models with in nite boundary were modeling via nite element method (FEM).Seismic response and deformation characteristics of slopes are systematically studied through timefrequency domain. A frequency-domain analysis method of complex slopes is proposed including modal and spectrum conjoint analysis. Modal analysis can directly display the main vibration modes of slopes.The combination of modal and spectral analysis can clarify the inherent characteristics of slopes, and reveal the interaction mechanism between inherent frequency and dynamic characteristics of slopes. The results illustrate that structural faces have signi cant effects on the propagation characteristics of wave within rock mass, and complex refraction/re ection phenomena occur near these discontinuities, thus to different dynamic response characteristics in the slope. Layered slopes have apparent magni cation effect of slope surface and altitude. Directions of seismic excitation and structural plane types affect the dynamic response of slopes. Horizontal wave mainly affects the middle and upper part of high-steep slope, while vertical wave has obvious in uence on the slope crest. Additionally, Fourier spectral analysis shows that structural planes have ltering effects on the high-frequency waves. Combined with modal analysis, it further explains that high-frequency section of waves mainly triggers local deformation of slopes, while low-frequency component controls their overall deformation. Finally, instability regions and evolution process of different layered slopes were predicted based on time-frequency conjoint analysis.
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