本文選題：土力學　切入點：土石混合體　出處：《巖石力學與工程學報》2017年08期 　論文類型：期刊論文

【摘要】：為研究土石混合體在含超徑顆粒情況下的力學響應(yīng),利用大型三軸剪切試驗儀,分別對體積含石量為25%,35%的非常規(guī)土石混合體試樣在3種不同圍壓條件下進行固結(jié)不排水剪切試驗。試驗結(jié)果顯示:含超徑顆粒土石混合體在不排水剪切條件下仍然存在體積變化;含石量35%的土石混合體在圍壓較高情況下,體應(yīng)變表現(xiàn)為加載初期剪縮,隨后剪脹,二次剪縮,再次剪脹的特征;含石量25%的土石混合體的應(yīng)力 應(yīng)變曲線較為平滑,但含石量在35%的情況下,應(yīng)力 應(yīng)變曲線則呈現(xiàn)鋸齒狀特征,且伴隨著間接性的應(yīng)力跳躍現(xiàn)象,相應(yīng)的體應(yīng)變、孔隙水壓力也出現(xiàn)跳躍現(xiàn)象,且與試樣的應(yīng)力變化具有很好的對應(yīng)關(guān)系。
[Abstract]:In order to study the mechanical response of soil-rock mixture with super-diameter particles, a large triaxial shear tester was used. The undrained shear tests of unconventional soil-rock mixture samples with 25% volume rock content were carried out under three different confining pressures. The test results showed that the undrained shear condition of the mixture containing super-diameter particles was still under the condition of undrained shear. However, there is a volume change; In the case of high confining pressure, the bulk strain of the mixture with 35% rock content is characterized by initial shear shrinkage, then dilatation, secondary shear shrinkage, and reshear expansion, and the stress-strain curve of the mixture with 25% rock content is relatively smooth. However, when the rock content is 35%, the stress-strain curve is serrated, and accompanied by the indirect stress jump phenomenon, the corresponding bulk strain and pore water pressure also appear jump phenomenon. And it has a good correspondence with the stress change of the specimen.
【作者單位】： 中國科學院地質(zhì)與地球物理研究所中國科學院頁巖氣與地質(zhì)工程重點實驗室;中國科學院大學;
【基金】：國家自然科學基金重點資助項目(41330643) 中國科學院科技服務(wù)網(wǎng)絡(luò)(STS)計劃項目(KFJ-EW-STS 094);中國科學院戰(zhàn)略性先導科技專項(B類)課題項目(XDB10030100)~~
【分類號】：TU43

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本文編號：1648713