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为了了解玄武岩纤维加筋黏土的剪切强度特性,将玄武岩纤维丝均匀地掺入黏土中,在控制含水率和干密度的条件下,进行了直剪试验,并借助扫描电镜,从微观层面对剪切面上的土体进行了观察。试验中,按纤维与干土质量的百分比0.0%,0.15%,0.25%,0.35%配制了试样,并从400 k Pa压力下的剪切面中选取代表性土样进行微观测试。直剪试验结果表明:随着纤维掺量的增加,土样的黏聚力c不断增大;和素土相比,在掺量不超过0.25%时,加筋土样的内摩擦角φ变化不大,当掺量达到0.35%时,内摩擦角φ有突然且较为显著的增大。SEM结果表明:掺量为0.25%时,纤维在土体中的离散程度最高,纤维与土体间的作用方式主要为握裹作用和纤维网作用;剪切过程中,纤维在土体中易发生滑移和磨损,其中玄武岩纤维的磨损不同于其它纤维,主要表现为端部的磨损,表面仍较为平整。
In order to understand the shear strength characteristics of basalt fiber reinforced clays, basalt fiber filaments were uniformly mixed into clay, and the direct shear tests were conducted under the control of water content and dry density. Scanning electron microscopy Soil on the cut surface was observed. In the test, the samples were prepared according to the mass percentage of fiber and dry soil of 0.0%, 0.15%, 0.25% and 0.35%, and the representative soil samples were selected from the shear surface under the pressure of 400 kPa for microscopic test. The results of direct shear test show that the cohesion c of soil sample increases with the increase of fiber content. Compared with plain soil, the internal friction angle φ of reinforced soil sample varies with the dosage of no more than 0.25% When the content reaches 0.35%, the internal friction angle φ increases suddenly and significantly. The results of SEM showed that when the dosage was 0.25%, the fiber was the most dispersed in the soil, and the interaction between the fiber and the soil was mainly the action of the entrapment and the action of the fiber web. In the process of shearing, the fibers were easy to be in the soil Slippage and wear occurred, basalt fiber wear different from other fibers, mainly for the end of the wear and tear, the surface is still relatively flat.