本文選題：膠結(jié)土石混合體　切入點(diǎn)：大三軸試驗(yàn)　出處：《巖土力學(xué)》2017年01期

【摘要】：膠結(jié)土石混合體在自然界中分布廣泛,為了揭示塊石含量和塊石形狀對(duì)其力學(xué)特性的影響,開(kāi)展了一系列室內(nèi)大三軸試驗(yàn)研究。首先,通過(guò)摻有一定量水泥的土石混合體試樣與未摻水泥的試樣進(jìn)行對(duì)比,以論證土石混合體有必要進(jìn)一步劃分為膠結(jié)土石混合體和無(wú)膠結(jié)土石混合體。然后,針對(duì)膠結(jié)土石混合體設(shè)計(jì)并進(jìn)行了不同塊石含量和塊石形狀的對(duì)比試驗(yàn)。最后,對(duì)膠結(jié)土石混合體力學(xué)特性的塊石含量和塊石形狀效應(yīng)進(jìn)行了分析探討。結(jié)果表明:水泥摻入比為3%的土石混合體試樣較未摻水泥的試樣強(qiáng)度和模量均有大幅提高,有明顯的應(yīng)變軟化和局部化剪切帶;在給定條件下,膠結(jié)土石混合體的峰值強(qiáng)度和脆性指數(shù)均隨含石量的增加而減小;當(dāng)含石量為40%時(shí),塊石為碎石的膠結(jié)土石混合體試樣與塊石為卵石的試樣相比峰值強(qiáng)度略低,而殘余強(qiáng)度略高;而當(dāng)含石量為70%時(shí),無(wú)論是峰值強(qiáng)度還是殘余強(qiáng)度,塊石為碎石的試樣均比塊石為卵石的試樣大,圍壓較大時(shí)尤為明顯。
[Abstract]:Cemented soil-rock mixture is widely distributed in nature. In order to reveal the influence of mass content and shape on its mechanical properties, a series of laboratory triaxial tests were carried out. By comparing the soil-rock mixture with a certain amount of cement with or without cement, it is proved that it is necessary to further divide the soil-rock mixture into cemented soil-rock mixture and non-cemented soil-rock mixture, and then it is necessary to divide the soil-rock mixture into cemented soil-rock mixture and non-cemented soil-rock mixture. According to the design of cemented soil-rock mixture, the contrast tests of different rock mass content and rock shape are carried out. The mass content and shape effect of cemented soil-rock mixture are analyzed and discussed. The results show that the strength and modulus of soil-rock mixture with cement ratio of 3% are greatly improved than that of uncement. There are obvious strain-softening and localized shear bands, the peak strength and brittleness index of cemented soil-rock mixture decrease with the increase of rock content under given conditions, and when the rock content is 40%, the peak strength and brittleness index of cemented soil-rock mixture decrease with the increase of rock content. The peak strength and residual strength of cemented soil-rock mixture specimens with aggregate rock as gravel are slightly lower than those of gravel samples, while the residual strength is slightly higher when the rock content is 70, whether it is peak strength or residual strength, The samples with crushed stones are larger than those with pebbles, especially when the confining pressure is high.
【作者單位】： 武漢大學(xué)土木建筑工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.41272342)~~
【分類(lèi)號(hào)】：TU411

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