A microbial method for improving salt swelling behavior of sulfate saline soil by an experimental study

Peng, Shuquan; Wang, Fan; Li, Xibing; Fan, Ling; Gong, Fengqiang

doi:10.1016/j.aej.2019.11.006

Cited by 19 publications

(7 citation statements)

References 33 publications

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“…In previous theoretical studies [11,[15][16][17], K ID is usually set as a constant of rock, but actually, it is a variable and has a linear relationship with loading rate. According to the researches on rock dynamic cracking under various loading rates [50][51][52][53][54][55], the dynamic fracture toughness of rock under blast loading can be written as…”

Section: Advances In Civil Engineeringmentioning

confidence: 99%

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Liu

Yang

2020

Advances in Civil Engineering

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The high in situ stress can significantly affect the blast-induced rock fragmentation and cause difficulties in deep mining and civil engineering where the drilling and blasting technique is applied. In this study, the rock crack propagation induced by blasting under in situ stress is first analyzed theoretically, and then a numerical model with a decoupled charge in LS-DYNA is developed to reveal how the initiation and propagation of rock cracks are under high in situ stress. Through simulation, the mechanisms of blast-induced crack evolution under various hydrostatic pressures and nonhydrostatic pressures are investigated, and the differences in crack evolution with specific decoupling coefficients are compared. According to the simulation, three damage zones, i.e., the crushed zone, the nonlinear fracture zone, and the radial crack propagation zone, are formed, and the radial crack evolution is greatly suppressed by the high in situ stress which has no much influence on the crack propagation in the crushed and the nonlinear fracture zones. The velocity of crack propagation is slightly reduced, and the process of crack propagation is stopped early when the rock is subjected to high in situ stress. Furthermore, the numerical analysis indicates that the crack grows preferentially in the direction of maximum principal stress, and the radial crack propagation is predominantly controlled by the preloaded pressure, which is vertical to the crack propagation direction. Based on the numerical results, it is suggested that the optimal decoupling coefficients for rock cracking are 2.65, 1.87, 1.37, and 1.22 for 0, 10, 20, and 30 MPa, respectively. This study provides not only an analysis of the rock crack evolution under high in situ stress but also a reference for resolving excavation difficulties in deep mining.

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Section: Advances In Civil Engineeringmentioning

confidence: 99%

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Liu

Yang

2020

Advances in Civil Engineering

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“…In this section, eight blasting events with known locations recorded by the IMS monitoring system of the Yongshaba mine, Guizhou province (China) were taken as application test data, and the blasting event locations are shown in the paper [47]. The hanging wall of ore body in the Yongshaba mine is dolomite with a good stability [48], while the crushed shale and sandstone were presented in the footwall, which showed an obvious difference in the P-wave velocity model. Furthermore, a large number of cavities were left in the early stage of mining by using the open-stope mining method, and the stress was adjusted accordingly.…”

Section: Applicationmentioning

confidence: 99%

“…Furthermore, a large number of cavities were left in the early stage of mining by using the open-stope mining method, and the stress was adjusted accordingly. For these reasons, obvious high-velocity and low-velocity regions existed [48][49][50][51][52] in the mining area (Figure 3), which increased the difficulty of an accurate MS event location. Therefore, a proper 3D velocity model should be considered in the location investigation.…”

Section: Applicationmentioning

confidence: 99%

Rock Fracture Monitoring Based on High-Precision Microseismic Event Location Using 3D Multiscale Waveform Inversion

et al. 2020

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Microseismic (MS) source location can help us obtain the fracture characteristics of a rock mass under a thermal-hydraulic-mechanical (THM) coupling environment. However, the commonly used ray-tracing-based location methods are easily affected by the large picking errors, multipath effects of travel time, and focusing and defocusing effects of rays in wavefield propagation, which are caused by the strong three-dimensional (3D) heterogeneity in mining areas. In this paper, we will introduce the rapidly developed waveform inversion-based location method into a mine MS field study. On this basis, the wavefields were modeled by utilizing a high-resolution 3D velocity model, a fractional-order Gaussian wavelet source-time function, and spectral element method (SEM) wavefield modeling. In order to reduce the computation cost of wavefield modeling, the 3D ray-shooting method based on a coarse grid was adopted to obtain an approximate MS event location. Based on this initial location, the multiscale waveform inversion strategy (from coarse to fine grids) and the L-BFGS iteration optimization algorithm were separately jointly selected to improve wavefield modeling speed efficiency and iterative convergence rate. Then, the IMS MS monitoring system set in the Yongshaba mine (China) and its tomographic 3D velocity model were used to conduct the synthetic test and application study. Results show that the source-time function based on the fractional-order Gaussian function wavelet can better fit complex recording waveforms compared with the conventional Ricker wavelet-based source-time function, and the waveform misfit during the L-BFGS iteration decreased rapidly. Furthermore, the multiscale waveform inversion method can obtain a similar location accuracy compared with the waveform inversion based on a single fine grid, and it can significantly decrease the iteration times and wavefield modeling computational cost. The average location error of the eight premeasured blasting events by the proposed approach is only 17.6 m, which can provide a good data research basis for analyzing MS event location and rock mass fracture characteristics in a mine.

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“…[ 7 ] However, the survival and the activities of microorganisms can be detrimentally affected by high salt concentrations, which may restrict the effectiveness of biological methods. [ 8 ] Thus, microorganisms that adapt well to high salinity stress should be selected for biological methods.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Bacterial and Archaeal Communities in Microbial‐Enhanced Constructed Wetlands under NaCl Stress

Wang

Liu

Yuan

et al. 2022

CLEAN Soil Air Water

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High salt concentrations can restrict or inhibit microorganism activity, which can detrimentally influence pollutant degradation. In this study, intertidal wetland sediments (IWS) are introduced into constructed wetlands (CWs) as sources of microorganisms. The richness and evenness of bacterial and archaeal microbial communities in the presence of 150 × 10−3 m NaCl are evaluated by high‐throughput sequencing. The distinction of dominant functional microorganisms in CWs with and without IWS is also analyzed. Anaerolineales and thermomicrobia are the dominant microorganisms in IWS–CWs in the saline condition and are related to methane production. The abundance of Alphaproteobacteria, Myxococcales, and Xanthomonadales, related to dehydrogenation, is relatively high in IWS–CWs. The addition of IWS induces further production of Anaerolineaceae and Geobacteraceae, which is positively correlated with the phosphorus‐accumulating and sulfate‐reducing stages. The dominant archaea phyla in IWS–CWs in the saline condition are Thaumarchaeota (87.5%) and Euryarchaeota (12.2%), which are involved in ammonia‐oxidizing and methane‐producing processes, respectively. These functional microbial communities are beneficial to the degradation and transformation of pollutants in the CWs. Thus, IWS with various halophilic and pollutant‐degrading microorganisms can be considered effective microbial sources to enhance the pollutant removal abilities of CWs.

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A microbial method for improving salt swelling behavior of sulfate saline soil by an experimental study

Cited by 19 publications

References 33 publications

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Study of the Rock Crack Propagation Induced by Blasting with a Decoupled Charge under High In Situ Stress

Rock Fracture Monitoring Based on High-Precision Microseismic Event Location Using 3D Multiscale Waveform Inversion

Characteristics of Bacterial and Archaeal Communities in Microbial‐Enhanced Constructed Wetlands under NaCl Stress

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