【摘要】：黃土的膠結(jié)連接是黃土濕陷的重要內(nèi)在因素,對其濕陷敏感性有著直接影響。為了對膠結(jié)連接在黃土濕陷敏感性中的作用有更清楚的認(rèn)識并提出一個能科學(xué)的判定黃土濕陷敏感性的評價方法,在黃土濕陷性試驗(yàn)的浸入水溶液里添加不同濃度的硝酸,測試在酸性環(huán)境中,不同壓力下黃土的濕陷系數(shù)、穩(wěn)定時間、濕陷速率等濕陷敏感性指標(biāo)。同時用掃描電鏡觀察試驗(yàn)前后土樣的孔隙、結(jié)構(gòu)變化情況。試驗(yàn)結(jié)果表明:在酸性溶液中,濕陷性黃土在低壓狀態(tài)下的濕陷系數(shù)增大較多,在各級壓力下的濕陷穩(wěn)定時間均有所延長;在水溶液和酸性溶液中,黃土有著不同的濕陷敏感壓力區(qū)間;濕陷性黃土的結(jié)構(gòu)強(qiáng)度對濕陷性黃土的深度有著重要影響等。在此試驗(yàn)基礎(chǔ)上,吸取前人的經(jīng)驗(yàn),提出用完成90%濕陷量的用時和濕陷系數(shù)這2個指標(biāo)對黃土及其場地進(jìn)行濕陷敏感性評價,并以發(fā)生過濕陷的場地——抽黃渠為實(shí)例對此方法進(jìn)行驗(yàn)證。驗(yàn)證結(jié)果表明,該方法能準(zhǔn)確地反映濕陷場地的濕陷敏感性,對濕陷場地上的工程建設(shè)具有一定的指導(dǎo)意義。此外,該方法簡單、科學(xué),又能與現(xiàn)行規(guī)范相結(jié)合,因此,易于被業(yè)界接受并推廣,是對現(xiàn)有少數(shù)關(guān)于黃土濕陷敏感性研究的有益補(bǔ)充。
[Abstract]:The cementation connection of loess is an important internal factor of loess collapsibility and has a direct influence on its collapsibility. In order to have a clearer understanding of the role of cemented joints in the sensitivity of loess collapsibility and to put forward a scientific evaluation method of loess collapsibility sensitivity, different concentrations of nitric acid were added to the soaking water solution of loess collapsibility test. The collapsibility indexes of loess under different pressures, such as coefficient of collapsibility, time of stabilization and rate of collapsibility, were tested in acidic environment. At the same time, the pore and structure of soil samples before and after the test were observed by SEM. The results show that in acid solution, the collapsibility coefficient of collapsible loess increases more at low pressure, and the stable time of collapsibility is prolonged at various pressures, and in aqueous solution and acid solution, the collapsibility coefficient of collapsible loess increases at low pressure. Loess has different sensitive pressure zones and the structural strength of collapsible loess has an important influence on the depth of collapsible loess. On the basis of this experiment and drawing on the previous experience, it is put forward that the sensitivity of loess and its site should be evaluated by using the two indexes of time and coefficient of collapsibility to complete 90% of the volume of collapsibility. The method is verified by an example of the site of over-subsidence-the drainage channel of the Yellow River. The results show that the method can accurately reflect the sensitivity of the collapsing site and has certain guiding significance for the engineering construction of the collapsible site. In addition, the method is simple, scientific, and can be combined with the current norms. Therefore, it is easy to be accepted and popularized by the industry, which is a useful supplement to a few existing researches on loess collapsibility sensitivity.
【作者單位】： 西安理工大學(xué)土建學(xué)院;西安理工大學(xué)陜西省黃土力學(xué)與工程重點(diǎn)實(shí)驗(yàn)室;陜西煤田地質(zhì)勘查研究院有限公司;陜西環(huán)保產(chǎn)業(yè)集團(tuán)有限責(zé)任公司;
【基金】：陜西省科技統(tǒng)籌創(chuàng)新工程重點(diǎn)實(shí)驗(yàn)室項(xiàng)目(2014SZS15 Z02)~~
【分類號】：TU444

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