本文選題：黏性土 + 土壤穩(wěn)定劑��； 參考：《河北建筑工程學(xué)院》2017年碩士論文

【摘要】：在垃圾填埋場的建設(shè)中,優(yōu)質(zhì)的黏性土是垃圾填埋場襯里的重要組成材料,然而由于大量垃圾填埋場的不斷建設(shè),尤其在優(yōu)質(zhì)黏性土資源貧乏地區(qū),導(dǎo)致優(yōu)質(zhì)黏土的供給捉襟見肘。針對張家口現(xiàn)有粉質(zhì)黏土,利用新材料抗疏力土壤穩(wěn)定劑進(jìn)行改良,得到性能更好的黏性土,一方面可以增大庫容,另一方面得到更多符合要求的黏性土。配置不同配合比土壤穩(wěn)定劑,配合比是指土壤穩(wěn)定劑與所用水的質(zhì)量比,對能夠影響垃圾填埋場安全使用的性質(zhì),進(jìn)行了大量試驗(yàn)研究,試驗(yàn)所用試樣的含水率均為最優(yōu)含水率,主要包括滲透性、無側(cè)限抗壓強(qiáng)度、收縮性、膨脹性、水穩(wěn)性及對離子的吸附性能等試驗(yàn),旨在改良土體的物理力學(xué)特性及環(huán)境土工特性,同時得出土壤穩(wěn)定劑的最優(yōu)配合比。通過試驗(yàn)結(jié)果可以看出,土樣的各方面性質(zhì)有明顯改善,其中在配合比為1:100時,最大干密度增大,這對滲透性、收縮性及膨脹性等均有一定的影響;與未改良前相比,滲透系數(shù)降低了1-2個數(shù)量級,已經(jīng)大大超過的規(guī)范的要求;在各壓實(shí)度下,線縮率和體縮率均達(dá)到了最小;無側(cè)限抗壓強(qiáng)度達(dá)到最大,同時仍與壓實(shí)度成正比,養(yǎng)護(hù)時間對強(qiáng)度影響不明顯;改良土的吸附性能隨土壤穩(wěn)定劑配合比的增大而增強(qiáng),但吸附量的增長幅度不大;試樣的水穩(wěn)性最佳,而且發(fā)生崩解的速率也遠(yuǎn)遠(yuǎn)低于其他種類;膨脹率較未改良時有了明顯的減小。綜合各試驗(yàn)結(jié)果,確定了土壤穩(wěn)定劑的最優(yōu)配合比為1:100。同時研究了一種將兩種改良材料結(jié)合到一起的雙層襯里結(jié)構(gòu),上層是利用土壤穩(wěn)定劑改良的黏性土,主要是利用改良土較高的強(qiáng)度、抗?jié)B性等性能;下層是利用膨潤土改良黏性土,主要是利用膨潤土改良張家口粉質(zhì)黏土土較好的吸附性。首先確定了膨潤土摻和比對黏性土吸附性的影響,然后對雙層結(jié)構(gòu)進(jìn)行了滲透性、無側(cè)限抗壓強(qiáng)度和吸附性能的試驗(yàn)研究,結(jié)果表明該結(jié)構(gòu)在保證抗?jié)B性和強(qiáng)度的條件下,吸附性能有明顯提高,離子吸附量數(shù)倍于單層結(jié)構(gòu)�？偠灾�,利用土壤穩(wěn)定劑改良后的土體的物理力學(xué)性質(zhì)和環(huán)境土工特性得到了較大的改善,該試驗(yàn)研究對緩解垃圾填埋場所用優(yōu)質(zhì)黏土缺乏的問題有重要實(shí)際指導(dǎo)意義。
[Abstract]:In the construction of landfill, high quality clay is an important component of landfill lining. However, due to the continuous construction of a large number of landfill sites, especially in areas with poor quality clay resources, As a result, the supply of high quality clay is stretched. According to the existing silty clay in Zhangjiakou, the clay with better performance can be obtained by using the new material anti-thinning soil stabilizer. On the one hand, the reservoir capacity can be increased, on the other hand, more clay can be obtained in accordance with the requirements. The mixture ratio refers to the mass ratio of the soil stabilizer to the water used in the landfill. A large number of experiments have been carried out on the properties that can affect the safe use of the landfill site. The moisture content of the samples used in the test is the optimum moisture content, which mainly includes the tests of permeability, unconfined compressive strength, shrinkage, expansion, water stability and adsorption of ions, etc. The purpose of this paper is to improve the physical and mechanical properties of soil and the environmental geotechnical properties, and to obtain the optimum mixture ratio of soil stabilizers. It can be seen from the test results that the properties of the soil samples have been improved obviously. The maximum dry density increases when the mixing ratio is 1: 100, which has a certain effect on the permeability, shrinkage and expansion of the soil, and compared with that before the improvement. The permeability coefficient has been reduced by 1-2 orders of magnitude, which has greatly exceeded the requirements of the specification. Under each compaction, the linear shrinkage rate and the volume shrinkage rate have reached the minimum; the unconfined compressive strength has reached the maximum, and is still proportional to the compaction degree. The effect of curing time on the strength is not obvious, the adsorption performance of the improved soil increases with the increase of the mixture ratio of soil stabilizer, but the increase of the adsorption capacity is not obvious, the water stability of the sample is the best, and the rate of disintegration is much lower than that of other kinds. The expansion rate decreased obviously compared with that without improvement. According to the experimental results, the optimum mixture ratio of soil stabilizer is 1: 100. At the same time, a double-layer lining structure which combines two kinds of improved materials is studied. The upper layer is clay modified by soil stabilizer, which mainly uses the properties of high strength and impermeability of the improved soil. In the lower layer, bentonite was used to improve clay, and bentonite was used to improve the sorption of Zhangjiakou silty clay. The influence of bentonite blending ratio on the adsorption of clay soil was first determined, and then the permeability, unconfined compressive strength and adsorption performance of the double-layer structure were studied. The results showed that the structure was under the condition of ensuring the impermeability and strength of the structure. The adsorbability of ion is several times as much as that of monolayer structure. In a word, the physical and mechanical properties and the environmental geotechnical properties of the soil modified by soil stabilizer have been greatly improved. The experimental study is of great practical significance in alleviating the lack of high quality clay used in landfills.
【學(xué)位授予單位】：河北建筑工程學(xué)院
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU442

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