Numerical study on seismic response of a rock slope with discontinuities based on the time-frequency joint analysis method

Geomatics, Natural Hazards and Risk

2020

Self Cite

To investigate the physico-mechanical properties of municipal solid waste incineration bottom ash (MSWIBA), the factors influencing the strength characteristics of MSWIBA were studied using an ultrasonic wave velocity test, to investigate its physico-mechanical properties. The test results show that the curing age, dry density, temperature, particle size, moisture content, and soaking time in water affect the strength of MSWIBA. The analyses of the wave velocity suggest that the strength of MSWIBA increases with its curing age and dry density. The strength increases rapidly over a curing age of 3-7 days but increases slowly after 14 days. In addition, the strength increases under an increase in temperature within the range of 20-50 C, and it tends to stabilize above 50 C. Moreover, the moisture content and particle size have a significant effect on the strength. MSWIBA, with a particle size of 0-2 mm, exhibits the greatest strength, and its strength is maximal at the optimum moisture content (15%). The soaking time in water has an adverse impact on the strength of MSWIBA during the first 80 h, decreasing its strength by approximately 5%. Moreover, the Poisson's ratio of MSWIBA is determined using wave velocity ratios from elastic theory.

Section: Application Of Wave Velocity In the Strength Measurementmentioning

confidence: 99%

Experimental study on the strength behaviors of municipal solid waste incineration bottom ash using ultrasonic wave velocity tests

Xiang

Geomatics, Natural Hazards and Risk

2020

Self Cite

“…[24][25][26][27][28][29][30][31] The distribution and change of the stress field and displacement field in the slopes are complicated, which degrades the stability of the slopes. [32][33][34][35][36][37] In reality, the rock mass is in a combined stress state of prestatic load and dynamic disturbance, [38][39][40][41][42][43] which leads to a completely different mechanical response from the pure static or dynamic loading state of shallow rocks. It is difficult to give a reasonable explanation for the above failure phenomenon using the classical rock statics or dynamics theory based on shallow mining.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the influence of structural planes on the mechanical properties of sandstone specimens under cyclic dynamic disturbance

Energy Science & Engineering

Chen

et al. 2020

Self Cite

In recent years, with the increasing demand for mineral deposit resources and continuous consumption of shallow resources, many mines are gradually entering the deep mining state so that open-pit mines on high and steep slopes can be excavated. 1-4 The ultra-deep mine of TauTona in South Africa is known to extend at least 3500 m. 5 The Asturian coal basin in Spain has already reached depths exceeding 4000 m. 6 According to statistical analysis using the protocol

“…In recent years, the development and construction of urban development in central China have advanced rapidly (Kassomenos et al 2016;Cui et al 2018;Chen et al 2020;Du et al 2020). The construction of underground spaces inevitably rely on deep foundation pit engineering Liu, Song, et al 2020;Song, Chen, Chao, et al 2020;. In particular, the construction of urban subways, superhigh-rise buildings, urban comprehensive pipe corridors, large transportation hubs, underground large commercial complexes, etc., has brought about foundation pit projects at increasingly larger scales and deeper depths (Li et al 2017;Zhang et al 2017;Li and Chen 2018;Zhang et al 2018;Xiang and Song 2020).…”

Section: Introductionmentioning

confidence: 99%

Monitoring analysis of influence of extra-large complex deep foundation pit on adjacent environment: a case study of Zhengzhou City, China

Geomatics, Natural Hazards and Risk

Chen

Dong

et al. 2020

Self Cite

Extra-large complex deep foundation pit excavation has an impact on the surrounding environment. The deformation characteristics of deep foundation pits were investigated during excavation, according to the temporal and spatial variations in displacement, using long-term on-site displacement monitoring. The results show that the deformation characteristics of the supporting structure and surrounding buildings can be divided into four stages: earth excavation, cushion construction, internal support removal and cushion completion. In the stages of earthwork excavation and support removal, the settlement deformation of the supporting pile roof, lattice column and adjacent ground is large, and cushion construction has a weakening effect on foundation pit deformation. In the stages of earthwork excavation, cushion construction and internal support removal, the nonuniform settlement between adjacent lattice columns increases the lattice column deformation, and the deformation of the foundation pit tends to be stable after the completion of the internal support. The foundation pit excavation mainly affects the settlement deformation of the adjacent pipe gallery, and its deformation increases rapidly in the early stage of earthwork excavation. Moreover, the influence degree of foundation pit excavation on the surrounding environment decreases with increasing distance from the excavation area.