發(fā)布時(shí)間：2018-11-01 15:46

【摘要】：針對(duì)目前土工單軸拉伸試驗(yàn)水平的不足,研制了一套新型土工單軸拉伸試驗(yàn)裝置,該套裝置主要由試樣制備、加載、控制與數(shù)據(jù)采集4個(gè)部分組成。試驗(yàn)裝置通過燕尾槽與雙滑動(dòng)底板的設(shè)計(jì),可以制備不同拉伸段長(zhǎng)度的試樣并分別開展相應(yīng)的單軸拉伸試驗(yàn);通過試樣形式與所對(duì)應(yīng)拉伸夾具的設(shè)計(jì),解決了試樣端部在拉伸過程中出現(xiàn)的松弛與應(yīng)力集中問題;通過雙導(dǎo)軌拉伸裝置的設(shè)計(jì),避免了試樣在拉伸過程中出現(xiàn)的應(yīng)力偏心現(xiàn)象;通過雙級(jí)變速箱的設(shè)計(jì)使最小拉伸速率可達(dá)到0.001 mm/min,能夠準(zhǔn)確描述材料單軸拉伸破壞的演化過程,并能準(zhǔn)確測(cè)試材料的抗拉強(qiáng)度以及全過程的拉應(yīng)力-位移關(guān)系曲線。基于所研制的試驗(yàn)裝置開展了黏性土的單軸拉伸試驗(yàn),試驗(yàn)結(jié)果表明:黏性土的單軸拉伸破壞形式不是純脆性破壞,而是在抗拉強(qiáng)度后存在一個(gè)軟化階段,此時(shí)仍具有一定的承載能力;隨著試樣拉伸段長(zhǎng)度的增大,抗拉強(qiáng)度呈對(duì)數(shù)減小,峰值位移呈對(duì)數(shù)增大;隨著拉伸速率的增加,抗拉強(qiáng)度呈對(duì)數(shù)增加,峰值位移呈線性增加;抗拉強(qiáng)度與峰值位移均隨壓實(shí)度的遞增呈線性增加;隨著含水率的遞增,試樣的抗拉強(qiáng)度先增大后減小,即存在一個(gè)峰值,而峰值位移呈線性增加。
[Abstract]:In view of the deficiency of the present uniaxial tensile test, a new type of geo-uniaxial tensile test device is developed. The device is mainly composed of four parts: sample preparation, loading, control and data acquisition. Through the design of swallowtail groove and double sliding bottom plate, the specimen with different tensile length can be prepared and the corresponding uniaxial tensile test can be carried out respectively. Through the design of specimen form and the corresponding tensile fixture, the problem of relaxation and stress concentration at the end of the specimen during the tensile process is solved. The stress eccentricity of the specimen during the tensile process is avoided by the design of the double guideway drawing device. Through the design of two-stage gearbox, the minimum tensile rate of 0.001 mm/min, can accurately describe the evolution process of uniaxial tensile failure of the material, and the tensile strength of the material as well as the tensile stress-displacement curve of the whole process can be accurately measured. The uniaxial tensile test of clay is carried out based on the experimental device. The results show that the failure mode of clay under uniaxial tension is not pure brittle failure, but a softening stage after tensile strength. At this time, there is still a certain bearing capacity; With the increase of tensile length, the tensile strength decreases logarithmically and the peak displacement increases logarithmically, and with the increase of tensile rate, the tensile strength increases in logarithm, and the peak displacement increases linearly. The tensile strength and the peak displacement increase linearly with the increase of compaction, and the tensile strength increases first and then decreases with the increase of water content, that is, there is a peak value and the peak displacement increases linearly.
【作者單位】： 南昌工程學(xué)院土木與建筑工程學(xué)院;江西省水利土木特種加固與安全監(jiān)控工程研究中心;江西省水利土木工程基礎(chǔ)設(shè)施安全重點(diǎn)實(shí)驗(yàn)室;南昌航空大學(xué)土木建筑學(xué)院;河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.51609114) 江西省青年科學(xué)基金項(xiàng)目(No.20114BAB216010) 河海大學(xué)巖土力學(xué)與堤壩工程教育部重點(diǎn)實(shí)驗(yàn)室開放基金項(xiàng)目(No.2016001)~~
【分類號(hào)】：TU415

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