文献类型：期刊文献

英文题名：An Experimental Study on the Preparation of Soft Rock Similar Materials Using Redispersible Latex Powder as a Modifier

作者：Ren, Xu Zhang, Zhufang Xiang, Min Xu, Guihong Cao, Wenze

第一作者：任旭

通信作者：Ren, X[1]

机构：[1]Guizhou Inst Technol, Coll Civil Engn, Guiyang 550003, Peoples R China;[2]Guizhou Highway Engn Grp Co Ltd, Guiyang 550025, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Coll Civil Engn, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2022

卷号：27

期号：21

外文期刊名：MOLECULES

收录：;Scopus(收录号：2-s2.0-85141567087);WOS:【SCI-EXPANDED(收录号:WOS:000883560300001)】；

基金：This research was funded by the National Natural Science Foundation of China grant number 51868009 and Science and Technology Department Foundation of Guizhou Province grant number ZK [2021] General 296.

语种：英文

外文关键词：soft rock; similar materials; geomechanical model test; physical and mechanical indexes; plastic failure

摘要：The engineering geological problems of soft rock are common in large slope engineering and underground engineering surrounding rock. In order to study the change in mechanical properties of soft rock under the action of loading, excavation and rainfall, this paper carried out experimental research on similar materials of soft rock. The similar material of soft rock is prepared by using iron fine powder, barite powder and quartz sand as aggregate, gypsum as binder and redispersible latex powder as regulator. A single-factor influence test was designed with the content of redispersible latex powder as variation parameter. Analysis the influence of redispersible latex powder from the perspectives of physical and mechanical indexes, failure forms, stress-strain states and changes after water seepage. In addition, evaluate the feasibility of this similar material in geomechanical model test. Experimental results show that the density, compressive strength and Poisson's ratio of similar materials can be improved to a certain extent by the redispersible latex powder with low dosage. However, the above indexes show a significant downward trend with the increase in dosage when the dosage exceeds 2%. The deformation modulus always shows a downward trend, and this trend becomes more significant especially when the dosage exceeds 2%. With the increase in the redispersible latex powder, the stress-strain curves of similar materials show obvious elastic and plastic stages. The failure mode gradually changes to X-shaped conjugate failure, which is common in soft rock, and the material changes from brittle failure to plastic failure. In addition, this type of similar material with gypsum as cementing agent will cause serious damage and loss of bearing capacity after seepage. These methods produce similar materials with low strength, low deformation modulus and plastic failure form, which can be used to simulate the stability of soft rock engineering caused by loading or excavation. At the same time, it also sheds lights on preparing similar materials of hard rock.