發(fā)布時間：2018-12-15 02:55

【摘要】：為了研究土體的拉伸變形特性,進(jìn)而更好地分析與解決土體由于拉伸破壞而引起的裂縫與地表塌陷等工程問題,本文以壓實黏土為研究對象,基于自主研發(fā)的新型土工單軸拉伸試驗裝置開展了系統(tǒng)的試驗研究,探討了壓實黏土的破壞形式與影響因素,以及峰值位移隨試驗變量的變化規(guī)律與擬合公式。研究結(jié)果表明:壓實黏土單軸拉伸破壞形式不固定,包括拉伸斷裂面形狀不固定;斷裂面為試樣薄弱面,斷裂面唯一,但薄弱面不一定唯一;斷裂面的位置受試樣尺寸與拉伸速率影響;拉伸破壞不是純脆性破壞,而是存在軟化階段。另外,壓實黏土的峰值位移受試驗條件的影響明顯,具體表現(xiàn)在:峰值位移隨拉伸段長度的增加而增大,二者呈現(xiàn)出較好的對數(shù)關(guān)系;峰值位移隨拉伸速率的增加而增大,二者呈現(xiàn)出較好的線性關(guān)系;峰值位移隨壓實度的增加而增大,二者表現(xiàn)出較好的線性關(guān)系;峰值位移隨含水率的增加而增大,二者表現(xiàn)出較好的線性關(guān)系。
[Abstract]:In order to study the tensile deformation characteristics of soil and to better analyze and solve the engineering problems such as cracks and ground collapse caused by tensile failure, this paper takes compacted clay as the research object. Based on a new type of geotechnical uniaxial tensile test device developed by ourselves, a systematic experimental study was carried out. The failure mode and influencing factors of compacted clay were discussed, as well as the variation law and fitting formula of peak displacement with test variables. The results show that the uniaxial tensile failure of compacted clay is not fixed, including the shape of tensile fracture surface is not fixed, the fracture surface is the weak surface of the specimen, the fracture surface is unique, but the weak surface is not necessarily unique. The location of the fracture surface is affected by the specimen size and tensile rate, and the tensile failure is not a pure brittle failure, but a softening stage. In addition, the peak displacement of compacted clay is obviously affected by the test conditions. The results show that the peak displacement increases with the increase of the length of the tensile section, which shows a good logarithmic relationship; The peak displacement increases with the increase of tensile rate, and the peak displacement increases with the increase of compaction. The peak displacement increases with the increase of moisture content, which shows a good linear relationship.
【作者單位】： 南昌工程學(xué)院土木與建筑工程學(xué)院;江西省公路科研設(shè)計院;河海大學(xué)巖土工程研究所;
【基金】：國家自然科學(xué)基金(51609114) 巖土力學(xué)與堤壩工程教育部重點實驗室開放基金(2016001)資助
【分類號】：TU442

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