Geomechanics and Geoengineering-An International Journal最新文献_第7页

GIS based assessment of rainfall-induced landslide susceptibility of sensitive marine clays: a case study 基于GIS的敏感性海相粘土降雨诱发滑坡易感性评价:一个案例研究

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-07 DOI: 10.1080/17486025.2021.1955152

Mohammad H. Al-Umar, M. Fall, B. Daneshfar

{"title":"GIS based assessment of rainfall-induced landslide susceptibility of sensitive marine clays: a case study","authors":"Mohammad H. Al-Umar, M. Fall, B. Daneshfar","doi":"10.1080/17486025.2021.1955152","DOIUrl":"https://doi.org/10.1080/17486025.2021.1955152","url":null,"abstract":"ABSTRACT Landslides are frequent occurrences in Ottawa, Canada because sensitive marine clays (also known as Leda clay or Champlain Sea clay) dominate the landscape. These landslides are often triggered by rainfall in the region. A geographic information system (GIS) based modelling approach has been developed to assess and predict rainfall-induced landslides in the sensitive clays of the Ottawa region. The Transient Rainfall Infiltration and Grid-based Slope-stability (TRIGRS) model has been used in a GIS framework to investigate the influence of rainfall On shallow landslides over the Ottawa region, with respect to time and location. The assessment result maps show that the steep slopes of sensitive clays are more prone to landslides. Furthermore, susceptibility to landslides in these areas increases with long periods of intense rainfall. The proposed GIS based model is validated by comparing the predicted areas of landslides induced by rainfall with previous shallow landslides that had occurred in the Ottawa region. The results show that there is a good agreement between the predicted areas of landslides and the previous landslides reported. The proposed GIS–TRIGRS combined modelling approach can be therefore considered as a potential tool for assessing and predicting rainfall induced landslides in sensitive marine clays in Ottawa.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43026063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Triaxial behaviour of geotextile reinforced sand 土工织物加筋砂的三轴特性

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-06 DOI: 10.1080/17486025.2021.1986235

Sidali Denine, N. Della, Rawaz Dlawar Muhammed, Sadok Feia, J. Canou, J. Dupla

{"title":"Triaxial behaviour of geotextile reinforced sand","authors":"Sidali Denine, N. Della, Rawaz Dlawar Muhammed, Sadok Feia, J. Canou, J. Dupla","doi":"10.1080/17486025.2021.1986235","DOIUrl":"https://doi.org/10.1080/17486025.2021.1986235","url":null,"abstract":"ABSTRACT In order to study the behaviour of reinforced sand, a series of monotonic consolidated drained and consolidated undrained triaxial tests was conducted on Chlef sand samples and, respectively, sand samples reinforced with one layer and two layers of geotextile reinforcement. Considering both the relatives densites of samples (Dr = 30% and 80%) and the different levels of confining pressure (p’c) of 50, 100, and 200 kPa. It is noticed from the obtained results that reinforcement contribution was evident in the drained condition than for the undrained one. Results have shown under low confining pressure that adding two layers of geotextile reinforcement to loose sample leads to an increase in the value of maximum shear strength significantly for undrained sample of about 97%, then it will be less important by increasing confining pressure up to 200 kPa; at this level, the maximum shear strength has become more pronounced for the drained reinforced sample. It was also observed that the dilation of dense samples has clearly affected by the confining pressure, and this should be mainly attributed to the low dilatancy property of Chlef sand.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48727937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Bearing capacity of ring foundations over a rock mass using numerical analysis 岩体上环形基础承载力的数值分析

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-05 DOI: 10.1080/17486025.2021.1975050

K. Birid, D. Choudhury

{"title":"Bearing capacity of ring foundations over a rock mass using numerical analysis","authors":"K. Birid, D. Choudhury","doi":"10.1080/17486025.2021.1975050","DOIUrl":"https://doi.org/10.1080/17486025.2021.1975050","url":null,"abstract":"ABSTRACT Ring foundations are used for circular industrial structures and often placed over a rock mass. However, the bearing capacity factors for ring foundation are not available in the literature. Hence upper and lower bound finite element limit analysis (FELA) was performed to evaluate the bearing capacity factors for the ring foundation resting over a rock mass. The Hoek-Brown constitutive model was adopted to study variations in the geometry of ring foundation, Geological Strength Index (GSI), intact rock constant (mi), and unit weight of rock mass (γ) on the bearing capacity of the ring foundation. The bearing capacity factors Nσ are presented for the different values of GSI, mi, and γ. The failure patterns under varying ring geometry and the rock mass unit weight are presented and discussed. The results show an increase in the bearing capacity with an increase in Hoek-Brown parameters for a rock mass. The bearing capacity is observed to be decreasing with an increase in the ratio (Ri/Ro) of the inner radius (Ri) to the outer radius (Ro) of the ring foundation. Design tables are provided as a ready reference for practitioners to evaluate the bearing capacity of the ring foundations resting over a rock mass.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48435060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Comparison between Mohr-Coulomb failure criterion and Vipulanandan failure models to predict the maximum J_2 Invariant and behaviour of clay (CH) Mohr-Coulomb破坏准则与Vipulanandan破坏模型预测粘土最大J_2不变量及特性的比较

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-04 DOI: 10.1080/17486025.2021.1980620

C. Vipulanandan, Ahmed Salih Mohammed

{"title":"Comparison between Mohr-Coulomb failure criterion and Vipulanandan failure models to predict the maximum J_2 Invariant and behaviour of clay (CH)","authors":"C. Vipulanandan, Ahmed Salih Mohammed","doi":"10.1080/17486025.2021.1980620","DOIUrl":"https://doi.org/10.1080/17486025.2021.1980620","url":null,"abstract":"ABSTRACT According to experimental data results, both inherent anisotropy and loading direction significantly impact geomaterial failures. Clay soils are commonly encountered in many types of on the ground or underground construction, so it is important to understand their behaviour under various stress conditions. Vipulanandan failure model was used to investigate the failure stresses for the soil as compared to the Mohr-Coulomb and other failure models. In this study, over 3000 data from the laboratory studies and literature for the field soils were analysed to quantify the relationship between the density, natural moisture content, shear strength, deviatoric shear stress at failure with the liquid limit (LL). The range of liquid limit (LL) for the soil investigated varied from 20% to 60%. Vipulanandan correlation model correlated some of the physical properties of the soils. The Vipulanandan failure model predicted the results more reliable than the other models based on the coefficient of determination and root mean square error. Vipulanandan failure model also predicted the maximum shear strength limit and maximum second deviatoric stress invariant for the soil, which can not be predicted using the Mohr-Coulomb failure criterion.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42054056","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Effect of post-construction moisture condition on mechanical behaviour of Fiber-reinforced-cemented-sand (FRCS) 施工后水分条件对纤维增强水泥砂力学性能的影响

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-01 DOI: 10.1080/17486025.2021.1980230

Moein Ghadakpour, A. Fakhrabadi, Asskar Janalizadeh Choobbasti, Saman Soleimani Kutanaei, A. Vafaei, Mobina Taslimi Paein Afrakoti, Neda Eisazadeh

{"title":"Effect of post-construction moisture condition on mechanical behaviour of Fiber-reinforced-cemented-sand (FRCS)","authors":"Moein Ghadakpour, A. Fakhrabadi, Asskar Janalizadeh Choobbasti, Saman Soleimani Kutanaei, A. Vafaei, Mobina Taslimi Paein Afrakoti, Neda Eisazadeh","doi":"10.1080/17486025.2021.1980230","DOIUrl":"https://doi.org/10.1080/17486025.2021.1980230","url":null,"abstract":"ABSTRACT Such parameters as cement content, cement type, relative density, grain size distribution, and moisture condition can influence the mechanical behaviors of Fiber-Reinforced-Cemented-Sand (FRCS). Various tests such as Unconfined Compression Strength (UCS), Unconsolidated-Undrained triaxial compression strength (UU), ultrasonic tests, and various analysis, that is, Scanning Electron Microscopy (SEM), image processing, Analysis of Variance (ANOVA), and sensitivity have been performed to investigate the effect of moisture conditions on the mechanical characteristics of treated sandy soil. All the specimens contained 3% or 6% cement contents by dry weight ratio of soil. In addition, kenaf fibers with 8 mm length were utilized by dry weight ratio of 0, 0.25, 0.5 and 0.75 percent; specimens were cured for 14 and 28 days. The results of unconfined compression test demonstrate that both the peak strengths and the residual strengths were decreased by immersing samples and increasing the saturation degree. For instance, for soaked samples with fiber content (FC) of 0.75%, the UCS and residual strength decreases 28% and 40%, respectively. Additionally, the undrained cohesion (Cu) obtained from unconfined compression test declines due to the sample inundation which is directly related to the amount of fiber. In contrast, triaxial test undrained cohesion (Cu) rises by doing so.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47163079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Heave and load-settlement behaviour of a chemically stabilised expansive clay bed 化学稳定膨胀粘土层的垂荡和荷载沉降特性

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-10-01 DOI: 10.1080/17486025.2021.1980232

E. Ramanjaneya Raju, B. Phanikumar, M. Heeralal

{"title":"Heave and load-settlement behaviour of a chemically stabilised expansive clay bed","authors":"E. Ramanjaneya Raju, B. Phanikumar, M. Heeralal","doi":"10.1080/17486025.2021.1980232","DOIUrl":"https://doi.org/10.1080/17486025.2021.1980232","url":null,"abstract":"ABSTRACT Structures found in expansive soils are subjected to heave and downward movement when they absorb water and lose water to the atmosphere, respectively. The upward and downward movements of structures built on the expansive clay strata are controlled through various treatment methods such as chemical stabilisation. As these clay strata are subjected to stresses due to superstructures, an understanding of their load-carrying capacity in the light of changing moisture content is required to assess this behaviour. This paper presents the heave and load-settlement behaviour of a remoulded expansive clay bed stabilised with varied amounts of lime, cement, fly ash and ground granulated blast furnace slag (GGBS). A series of laboratory-scale plate load tests were conducted on the beds of chemically stabilised clay compacted at the respective OMC and MDD. The plate load tests were conducted in two series: one on the as-compacted beds of the blends, and the other on the saturated beds of the blends to compare their stress-settlement behaviour. The amount of heave and the rate of heave were also monitored during the process of saturation. Chemically stabilised expansive clay beds reflected improved load-settlement behaviour in both the as-compacted and the saturated states.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43940290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effects of fibre type and content on unconfined compressive strength of fibre-reinforced lime or cement-stabilised soils 纤维类型和含量对纤维增强石灰或水泥稳定土无侧限抗压强度的影响

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-09-30 DOI: 10.1080/17486025.2021.1984589

Sayyed Mostafa Haghighatjoo, S. Y. Zolfegharifar

{"title":"Effects of fibre type and content on unconfined compressive strength of fibre-reinforced lime or cement-stabilised soils","authors":"Sayyed Mostafa Haghighatjoo, S. Y. Zolfegharifar","doi":"10.1080/17486025.2021.1984589","DOIUrl":"https://doi.org/10.1080/17486025.2021.1984589","url":null,"abstract":"ABSTRACT Soil reinforcement and stabilisation using a combination of natural or synthetic fibres, lime, cement and fly ash is very useful when construction had been done on weak soil. This study is evaluated the utilisation of fibres, cement and lime as a stabiliser for soil improvement. The unconfined compressive strength (UCS) tests carried out on the specimens containing various contents of cement, lime and fibre after curing times of 7 and 28 days to estimate the optimum mixture design. In preparing specimens, the clay soil was mixed with the desired amount of cement or lime and fibre then compacted at the optimum water content and maximum dry density. The results show that the UCS increases about 7.5 times in a cement content change from 5% to 25% at a curing time of 28 days. However, this value is about 11.5 for lime–stabilised specimens. The UCS of cement or lime-stabilised specimens with or without fibre reinforcement increases as curing time increases from 7 to 28 days. However, it is concluded that the optimum fibre content corresponding to maximum UCS is directly dependent on the type of fibre. Mostly the optimal fibre content varies from 6% to 10% depending on cement type.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44452833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effective use of microbes in waste soil stabilisation considering natural temperature variations 考虑自然温度变化的废土壤稳定中微生物的有效利用

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-09-27 DOI: 10.1080/17486025.2021.1981465

B. Mir, K. M. N. S. Wani

{"title":"Effective use of microbes in waste soil stabilisation considering natural temperature variations","authors":"B. Mir, K. M. N. S. Wani","doi":"10.1080/17486025.2021.1981465","DOIUrl":"https://doi.org/10.1080/17486025.2021.1981465","url":null,"abstract":"ABSTRACT Dredged soils are waste deposits left unutilised in huge quantities. In order to effectively utilise such weak deposits, proper improvement techniques need to be adopted. In this study, four different bacillus microbes namely Bacillus pasteurii, Bacillus megaterium, Bacillus sphaericus and Bacillus subtilis along with cementing solution at different molarities (0.5 and 1 CSM) have been incorporated into the soil at an optical density of 1.5 (108 cells/ml). Unconfined compressive strength (UCS) and permeability tests have been performed on the soil samples. The samples were provided treatment (48 h) and curing (7 and 14 days) in natural conditions. The UCS test results at 0.5 CSM and 7 days curing revealed a noticeable enhancement. Permeability reduced by one order at 14 days of curing and 1 CSM. Three different ranges of temperature depending upon natural climatic variations were designated for testing, and it was concluded that 18–23°C was the optimum temperature for all the treatment processes. This study puts forth the importance of green eco-friendly technology in improving dredged soils from wetland peripheries thus helping indirectly in restoring its balance. Scanning electron microscopy (SEM) along with energy dispersive spectroscopy (EDS) provided conclusive support to the experimental investigations.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46073654","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Engineering characteristics of soil stabilised with saw dust ash and cement 锯末灰和水泥稳定土的工程特性

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-09-27 DOI: 10.1080/17486025.2021.1981464

Tausif E Elahi, A. R. Shahriar, Md. Kausar Alam, Md. Zoynul Abedin

{"title":"Engineering characteristics of soil stabilised with saw dust ash and cement","authors":"Tausif E Elahi, A. R. Shahriar, Md. Kausar Alam, Md. Zoynul Abedin","doi":"10.1080/17486025.2021.1981464","DOIUrl":"https://doi.org/10.1080/17486025.2021.1981464","url":null,"abstract":"ABSTRACT The study herein investigates the performance of Saw Dust Ash (SDA) in combination with cement for soil stabilisation. Performance of SDA is studied with respect to compressive strength, shear strength, penetration and deformation responses. For a certain cement content, the compressive strength reaches a maximum value with the increase of SDA and the corresponding SDA content is defined as the optimum content. Optimum SDA content varies within 6–12% based on the percent of cement added. When optimum amount of SDA is added, 28 days’ compressive strength of 2406–5625 kPa was achieved for varying amount of cement (3–7%). The mechanical response is illustrated using microstructural observations. Results from direct shear tests revealed that with the inclusion of 6–15% SDA with cement, improved shear strength parameters (cohesion, angle of internal friction) can be obtained; an angle of internal friction as high as 40 was achieved herein. Compression index can be reduced by 32–41% compared to unstabilised soil if optimum amount of SDA-cement is added. It is concluded that considering compressive strength, shear strength, penetration resistance and compressibility, SDA can effectively be used along with cement for stabilisation of clay soil.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49274890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Experimental and numerical investigations on attenuation response of machine foundations under vertical excitation 垂直激励下机器基础衰减响应的实验与数值研究

IF 1.3

Geomechanics and Geoengineering-An International Journal Pub Date : 2021-09-23 DOI: 10.1080/17486025.2021.1980231

Sreyashrao Surapreddi, P. Ghosh

{"title":"Experimental and numerical investigations on attenuation response of machine foundations under vertical excitation","authors":"Sreyashrao Surapreddi, P. Ghosh","doi":"10.1080/17486025.2021.1980231","DOIUrl":"https://doi.org/10.1080/17486025.2021.1980231","url":null,"abstract":"ABSTRACT The attenuation response from a series of block vibration tests performed on a model square machine foundation at a site near IIT Kanpur, India, is reported in this paper. The dynamic response at different locations from the vibration source is measured for a wide range of frequencies. The observed attenuation response is compared with the analytical and the finite element (FE) solutions to bolster the experimental findings. A parametric study is conducted utilising the FE analysis to predict the surface wave mitigation characteristics in various soils. It can be observed that the surface waves dominate the attenuation characteristics at the far-field locations and attenuate at a faster rate in soft soils compared to stiff soils. The material and the geometric damping characteristics of the surface waves influence the attenuation characteristics of horizontal and vertical vibrations at the far-field pick-up points. The attenuation characteristics of horizontal and vertical amplitude responses are found to differ significantly. Curve fitting and regression analyses are also performed to develop simplified design expressions to predict the attenuation response of horizontal and vertical vibrations. The proposed design expressions compare well with the values reported in the literature and can be utilised by practicing engineers.","PeriodicalId":46470,"journal":{"name":"Geomechanics and Geoengineering-An International Journal","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2021-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47554698","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7