International Journal of Rock Mechanics and Mining Sciences最新文献

{"title":"Meso-mechanical mechanism of ordered mica alignment on the progressive failure process of granite under different lateral stress directions","authors":"Chen Fan ,&nbsp;Xia-Ting Feng ,&nbsp;Jun Zhao ,&nbsp;Cheng-Xiang Yang ,&nbsp;Meng-Fei Jiang","doi":"10.1016/j.ijrmms.2025.106037","DOIUrl":"10.1016/j.ijrmms.2025.106037","url":null,"abstract":"<div><div>Accurately understanding the mechanical properties of surrounding rock is crucial for minimizing the risk of surrounding rock instability. In a deep TBM tunnel, mica minerals in the surrounding rock exhibit an intermittently oriented alignment, which is considered one potential cause of time-delayed failures. Under the same true triaxial stress, creep tests were conducted on granite with different strike angles <em>ω</em> when dip angle <em>β</em> = 50°, to investigate the impact of ordered mica alignment under different lateral stress directions (<em>σ</em>₂ ≠ <em>σ</em>₃). Results show that the strike angle <em>ω</em> also have a significant impact on the progressive failure process of granite under true triaxial stress. In the multi-stage creep tests, the final failure strength of granite at <em>ω</em> = 0° was approximately 73 % higher than that at <em>ω</em> = 90°. Brazilian splitting tests also confirm the crack development at mica tips under different mica orientations, with the maximum difference in tensile strength reaching 37 %. The essence of the impact of mica orientation on rock failure process lies in the promotion of crack initiation and coalescence under high stress. Under a moderate dip angle <em>β</em>, relative sliding between mica cleavage planes is easier when <em>ω</em> = 60° or 90°, leading to crack initiation at mica tips and significantly compromising the load-bearing structure of granite. Based on fracture mechanics, this paper also provides theoretical explanations for the differences in mesoscopic fracturing process of granite with different mica orientations. In surrounding rock stability analyses, it is crucial to consider the complex combinations of rock microstructure and local stress state in the field, which would cause significant variations in surrounding rock stability.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106037"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Damage zone around underground opening caused by combined blast loading and initial stress unloading","authors":"Rui Zhao ,&nbsp;Ming Tao ,&nbsp;Murat Karakus","doi":"10.1016/j.ijrmms.2024.106018","DOIUrl":"10.1016/j.ijrmms.2024.106018","url":null,"abstract":"<div><div>The formation of an Excavation Damaged Zone (EDZ) is a common issue in mining and other geotechnical engineering fields, which impacts the stability of surrounding rock mass. The excavation of deep, stressed rock mass induces stress redistribution and propagates stress waves that form an EDZ around the excavation. Modelling the complex processes of stress relief and adjustment in anisotropic stress states is challenging but essential for understanding EDZ formation mechanisms and optimizing blast design. In this study, we derive the stress response in the surrounding rock mass caused by the initial stress unloading and blast loading in arbitrary stress states. This is achieved by the application of modal superposition and Laplace transform. The impacts of the unloading period, blasting amplitude, and stress state were studied. Then a series of Finite Element Method (FEM) numerical simulations were carried out to obtain the EDZ around the opening under pure unloading and combined loading-unloading. The field observations of the distributions of EDZ in underground mining tunnels excavated by blasting were analysed in conjunction with the theoretical and numerical findings. The results showed the extent of the EDZ increases with initial stress, and at lower stress levels, blasting predominantly governs the formation of the EDZ, while at higher stress levels, unloading and stress redistribution prevail. Blast loading was suggested to be the main cause of the Highly Damaged Zone (HDZ), as the unload-induced redistributed stress and blast loading stress were linearly superimposed in the radial and tangential direction, leading to the elevation in the tangential tensile stress and the radial compressive stress in the rock mass near the excavation boundary.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106018"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142929215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Leveraging negative pore pressure to constrain post-injection-induced slip of rock fractures","authors":"Zhou Fang,&nbsp;Wei Wu","doi":"10.1016/j.ijrmms.2024.106023","DOIUrl":"10.1016/j.ijrmms.2024.106023","url":null,"abstract":"<div><div>Negative pore pressure caused by unconventional energy production may offer insights into predicting and mitigating post-injection-induced seismicity. Here we presented triaxial shear experiments on sawcut, filled, and natural fractures under positive, zero, and negative pore pressures. The results show that negative pore pressure leads to an increase in the peak strength of the sawcut and filled fractures while reductions in post-peak stressing rate and fracture permeability, inhibiting unstable slip. Our analysis reveals that both the normalized stressing rates per net vented volume in the laboratory and per net production volume in the field decrease during the early stages of fluid extraction and stabilize at zero with long-term extraction. Notably, negative pore pressure develops as the normalized stressing rates approach zero, indicating its role as an indicator for constraining post-injection-induced slip of rock fractures. These findings align well with the observed correlation between net production volume and seismic activity at the Salton Sea Geothermal Field. Our study suggests that monitoring pore pressure can be an alternative method to predict the risk of post-injection-induced earthquakes, particularly in localized regions with isolated fractures experiencing high production volume and limited fluid replenishment.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106023"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142975144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Comprehensive in-situ stress estimation in a fractured geothermal reservoir in Pohang, South Korea using drilling data, hydraulic stimulations, and induced seismicity","authors":"Sehyeok Park ,&nbsp;Kwang-Il Kim ,&nbsp;Hwajung Yoo ,&nbsp;Juhyi Yim ,&nbsp;Ki-Bok Min","doi":"10.1016/j.ijrmms.2024.105978","DOIUrl":"10.1016/j.ijrmms.2024.105978","url":null,"abstract":"<div><div>A comprehensive in situ stress estimation is carried out in the fractured reservoir at the enhanced geothermal system development site in Pohang, South Korea. Various types of stress indicators were collected from the hydraulic stimulation data, drilling records, lost circulation records, well logs, seismic events, and the stress constraints from previously proposed stress models. The comprehensive comparison of the collected stress constraints was performed, and resulted in the possible stress magnitude range and corresponding limits on the range of possible friction coefficients. The resulting stress ratio is <em>S</em>_<em>V</em>: <em>S</em>_{<em>hmin</em>}: <em>S</em>_{<em>Hmax</em>} = 1 : 0.92–0.94 : 1.42–1.66 with the azimuth of <em>S</em>_{<em>Hmax</em>} in N101°E –N110°E range, based on the compilation of both direct and indirect stress information. The results also suggest a friction coefficient range of 0.35–0.38 that can best explain the involved stress constraints. The stress model suggested in this study can explain the characteristics of the M_w 5.5 Pohang earthquake in November 2017 in terms of reproducing the slip rake of mainshock and the slip tendency of the corresponding fault. Therefore, the result can be used for clarifying the causal mechanism of the Pohang earthquake, providing an insight for fault stability analysis or possible geo-energy application in the southeastern part of the Korean Peninsula. Comprehensive in-situ stress estimation method suggested in this study integrating extensive direct and indirect stress indicators can improve the credibility of the in-situ stress model at a fractured reservoir.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 105978"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142793448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental study of hydraulic fracture propagation in multi-hole synchronous fracturing in horizontal wells in sandstone","authors":"Yulong Jiang ,&nbsp;Weiguo Liang ,&nbsp;Haojie Lian ,&nbsp;Wei He","doi":"10.1016/j.ijrmms.2024.106013","DOIUrl":"10.1016/j.ijrmms.2024.106013","url":null,"abstract":"<div><div>Hydraulic fracture propagation in multi-hole synchronous fracturing plays a critical role in forming complex fracture networks in unconventional reservoirs. However, the propagation mechanism of multi-hole synchronous fracturing is still unclear, especially the effects of the fracturing borehole spacing and natural fracture. In this study, a series of experiments using a triaxial loading system were conducted to investigate the stress shadow effect in multi-hole hydraulic fractures propagation with different borehole spacings and the interaction between hydraulic fractures and natural fractures in specimens during hydraulic fracturing. The results indicated the following: 1) There is an obvious stress shadow effect in multiple fracture propagation, significantly influencing the fracture propagation path, direction and fracture initiation pressure. Hydraulic fracture propagation in multi-hole fracturing tests in specimens with different fracturing borehole spacings is significantly different, and increasing the fracturing borehole spacing can effectively change the fracture propagation path in the interior borehole and reduce the stress shadow effect. Compared to single cluster fracturing, hydraulic fractures in multi-hole fracturing show a single-wing form instead of double-wing propagation at the pre-existing artificial fractures, presenting asymmetrical and elliptical propagation of hydraulic fractures network. (2) The stress shadow effect effectively helps communicate adjacent fractures, resulting in a more complex fractures network. Under the stress conditions of 5/8/12 MPa and specimen size of 300 × 300 × 50 mm, when the fracturing hole spacing is small (less than 50 mm), hydraulic fractures perpendicular to the direction of the minimum horizontal principal stress generate from the external fracturing holes on both sides, and the hydraulic fractures parallel to the direction of the minimum horizontal principal stress generate from the middle fracturing hole. These hydraulic fractures propagate and interconnect, forming a complex fracture network. There is a critical spacing of 50 mm. (3) Under the influence of stress shadow, multiple fractures are more likely to penetrate artificial pre-existing fractures compared to hydraulic fractures in single fracturing hole, and can more effectively connect artificial pre-existing fractures, resulting in more complex fracture shapes.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106013"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142901910","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel approach of mitigating fault-slip induced dynamic disasters based on liquid super-lubricity","authors":"Jintong Zhang ,&nbsp;Wei Song ,&nbsp;Jun Wu ,&nbsp;Yue Shen ,&nbsp;Zhihong Zhao ,&nbsp;Jinjin Li","doi":"10.1016/j.ijrmms.2025.106033","DOIUrl":"10.1016/j.ijrmms.2025.106033","url":null,"abstract":"<div><div>Fault-slip induced dynamic disasters, such as seismicity and rockburst, pose significant risks to various subsurface engineering projects, and the currently used mitigation methods often involves strategies of modulating in-situ stresses in the surrounding rocks near fault planes timely. Here, we propose an alternative strategy for mitigating fault-slip induced dynamic disasters in terms of reducing friction of faults based on liquid super-lubricity principle. A series of friction experiments were conducted on fault specimens in which deionized water (DW), polyethylene glycol (PEG) solution, graphene oxide (GO coating), PEG with graphene oxide additives (GO in PEG) and ethyl alcohol aqueous solution with graphene oxide additives (GO in EA) were served as lubricants. The experimental results demonstrate that friction coefficients of flat and rough fault specimens were reduced by 3 % and 4 %, 46 % and 28 %, 62 % and 23 %, 74 % and 51 %, 62 % and 48 %, respectively, when lubricated by DW, PEG solution, GO coating, GO in PEG, and GO in EA compared to dry condition. Microscale friction tests and surface characterization were conducted to elucidate the lubrication mechanism of GO additives in PEG. The adsorbed PEG film and graphene layers on contact asperities effectively withstood high pressures, exhibiting low shear stress and preserving a relatively rough surface texture. The results suggest that injecting lubricant solutions into natural faults to modulate friction coefficients can effectively control fault slip and mitigate the risk of dynamic disasters.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106033"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A mathematical model for the shape prediction of bedded salt cavern used for energy storage","authors":"Tao He ,&nbsp;Tongtao Wang ,&nbsp;Chunhe Yang ,&nbsp;Youqiang Liao ,&nbsp;Dongzhou Xie ,&nbsp;Zhekang Ding ,&nbsp;J.J.K. Daemen","doi":"10.1016/j.ijrmms.2025.106029","DOIUrl":"10.1016/j.ijrmms.2025.106029","url":null,"abstract":"<div><div>The vertical layering and anisotropic characteristics of bedded rock salt are different from those of salt mounds, and the brine reinjection operation during the cavern creation process makes it difficult to predict the distribution of brine concentration in the cavern. The accumulation of slag in the complex cavern affects the brine flow characteristics and cavern volume, which makes the water-soluble cavern formation in bedded rock salt deviate from the expected design. In this paper, we propose the control scheme and required technology for cavern construction system in bedded rock salt, establish the prediction theory of brine cavern concentration and flow rate considering the cavern morphology and brine injection and drainage scheme, establish the prediction theory of dissolution morphology and insoluble matter morphology considering the difference of mineral components, and complete the coupled solution of the flow field, concentration field, morphology expansion, and insoluble matter morphology prediction, and give an example of software platform development with parameter input and graphic display function. A software platform development example with parameter input and graphic display functions is provided to facilitate engineers’ use. After the function test and the calculation of the cavern creation example, this paper can improve the stability of the control of cavern creation in bedded rock salt.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106029"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A data-driven method for the deformation analysis of layered rocks","authors":"Fanding Feng,&nbsp;Diansen Yang,&nbsp;Qinghui Jiang","doi":"10.1016/j.ijrmms.2025.106030","DOIUrl":"10.1016/j.ijrmms.2025.106030","url":null,"abstract":"<div><div>This paper proposes a data-driven method for the deformation analysis of layered rocks, which consists of generating a stress–strain database and using a data-driven computational solution. The method does not require defining the material's constitutive relationship to conduct analysis of layered rock deformation under loading of the same material. First, the data-driven identification (DDI) algorithm infers and builds a stress‒strain database of the material based on the strain field and loading force. Then, this database is used to calculate the response of the same material structure with arbitrary geometry and boundary conditions using data-driven computational mechanics (DDCM). The specific workflow of the method is demonstrated, and the computational accuracy and reliability are verified through an experimental application example. The method naturally combines the DDI algorithm and the DDCM solver, providing a new concept for analysing the deformation of layered rocks. Through this method, it is possible to conduct more accurate deformation analysis of layered rocks without defining their constitutive relationships. This has significant engineering application value in the design of excavations for layered rock slopes, foundations, and underground caverns.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106030"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A micro-macro fracture model for evaluating the brittle-ductile transition and rockburst of rock in true triaxial compression","authors":"Xiaozhao Li,&nbsp;Lianjie Li,&nbsp;Yujie Yan,&nbsp;Chengzhi Qi","doi":"10.1016/j.ijrmms.2024.105993","DOIUrl":"10.1016/j.ijrmms.2024.105993","url":null,"abstract":"<div><div>In deep underground engineering, true triaxial compressive stress and internal microcrack characteristics significantly influence the brittle-ductile transition and anisotropic mechanical behavior of rock, thereby affecting the engineering life cycle. However, current research on the micro-macro mechanical model under true triaxial compressive stress, particularly regarding the rock's brittle-ductile transition and anisotropic damage, is extremely limited. This paper aims to propose a macro-micromechanical model to describe the aforementioned physical and mechanical properties of rocks. The model introduces a lateral stress function into the micro-macro damage formula and derives the axial stress-strain relationship during crack propagation by incorporating the stress-crack length relationship under true triaxial stress. By considering the stress effects on the effective elastic modulus and nominal Poisson's ratio, the lateral stress-strain relationship is derived, resulting in a complete stress-strain curve. Finally, based on the relationships between triaxial principal strains, elastic deformation and triaxial principal stresses, the relationships between rock volumetric strain, crack volumetric strain, and triaxial principal stress are separately established. The influence of lateral principal stress on characteristic stresses is analyzed. The resulting model is combined with the brittleness evaluation index and the residual elastic energy index, respectively, to analyze the effects of micro parameters and principal stresses on brittleness and rockburst proneness. A comparative analysis of the similarities and differences between brittleness and rockburst proneness is conducted, revealing a positive correlation between the ratio of residual elastic energy and the post-peak to pre-peak brittleness index, expressed as <span><math><mrow><msub><mi>C</mi><mtext>EF</mtext></msub><mo>∝</mo><msub><mi>B</mi><mrow><mi>i</mi><mn>2</mn></mrow></msub><mo>/</mo><msub><mi>B</mi><mrow><mi>i</mi><mn>1</mn></mrow></msub></mrow></math></span>. The proposed model theoretically addresses the issues of brittle-ductile transition and anisotropic damage under true triaxial conditions. It can also be applied to explain and predict rockburst proneness.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 105993"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825395","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analytical solutions of two-liner tunnels constructed in time-dependent plastic rocks considering loading-unloading stress paths","authors":"Hua-ning Wang ,&nbsp;Qian Liu ,&nbsp;Fei Song ,&nbsp;Rui-cong Fu ,&nbsp;Ming-jing Jiang","doi":"10.1016/j.ijrmms.2024.106017","DOIUrl":"10.1016/j.ijrmms.2024.106017","url":null,"abstract":"<div><div>The mechanical behaviours of soft rocks are time-dependent and significantly influenced by the loading and unloading histories. The main objective of this study is to investigate the tunnelling behaviours of supported tunnels constructed in time-dependent plastic geotechnical materials, taking into account the tunnelling advancement, the viscoelastic-plastic behaviour of host rocks, sequentially installation of primary and secondary support systems, as well as the actual stress path throughout the entire excavation and construction stages. In the determination, the Burgers viscoelastic model and the unified strength theory respectively represent the time-dependency and plasticity of geotechnical materials. Furthermore, the interactions at both rock-support and support-support interfaces are considered. Finally, the time-dependent solutions of stresses, displacements, and supporting pressure are obtained, by using the compatibility and boundary conditions. As verification and validation steps, the results obtained from these solutions match well with numerical predictions and monitoring data. Finally, in the parametric analyses, the developed analytical solutions are performed to investigate the influence of the supporting time, and different material properties of host rocks and support systems on the stability of tunnels.</div></div>","PeriodicalId":54941,"journal":{"name":"International Journal of Rock Mechanics and Mining Sciences","volume":"186 ","pages":"Article 106017"},"PeriodicalIF":7.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142990459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}