本文關(guān)鍵詞：廢舊輪胎片體一風(fēng)化料混合料土工特性室內(nèi)試驗(yàn)研究　出處：《山東大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輪胎片體 風(fēng)化料 室內(nèi)試驗(yàn) 土工特性

【摘要】：廢舊輪胎作為一種易燃、難以降解的材料對(duì)自然環(huán)境造成了極大影響,尤其是現(xiàn)如今經(jīng)濟(jì)快速發(fā)展、汽車數(shù)量越來越多,廢舊輪胎導(dǎo)致的"黑色污染"問題也日益突出。對(duì)廢舊輪胎的處理和利用的方法有很多,包括輪胎原型直接利用、堆存填埋、燃料焚燒、熱解、翻新、機(jī)械破碎等,但存在廢舊輪胎回收率低、能源消耗高、加工再利用過程中出現(xiàn)二次污染等現(xiàn)象。我國橡膠資源匱乏,同時(shí)廢舊輪胎綜合回收利用產(chǎn)業(yè)的發(fā)展速度跟不上汽車制造業(yè)的發(fā)展速度,也無法適應(yīng)目前嚴(yán)峻的資源環(huán)境形勢要求,因此妥善處理廢舊輪胎,減少對(duì)資源環(huán)境的耗費(fèi)和破壞,這是亟待待解決的一大難題。通過機(jī)械破碎得到的廢舊輪胎片體(tire-derived aggregate,簡稱TDA)質(zhì)量輕、耐久性好、不易降解、強(qiáng)度高、吸附性和排水性優(yōu)良,主要應(yīng)用于公路路基、擋墻、橋臺(tái)和防凍脹層等作為道路工程的回填料、吸附介質(zhì)或隔震材料等,能夠提高結(jié)構(gòu)基礎(chǔ)承載力、降低沉降變形。廢舊輪胎片體通過與土體的混合,可以改善土體工程性能,得到輕質(zhì)高強(qiáng)的混合材料。本論文采用TDA和風(fēng)化料(weathered rock material,簡稱WRM)材料,通過開展一系列室內(nèi)土工試驗(yàn),研究了廢舊輪胎片體-風(fēng)化料(TDA-WRM)混合料的土工特性。采用不同質(zhì)量分?jǐn)?shù)輪胎片體摻入風(fēng)化料,制備不同含水率混合料。通過大尺寸擊實(shí)設(shè)備開展重型擊實(shí)試驗(yàn),得到了不同含水率條件下混合料的干密度變化。擊實(shí)結(jié)果表明,在風(fēng)化料中摻入廢舊輪胎片體不但能夠有效降低混合料的自重,還能減小水的用量,另外隨著混合料中廢舊輪胎片體質(zhì)量分?jǐn)?shù)的增加,混合料擊實(shí)曲線相比風(fēng)化料的擊實(shí)曲線出現(xiàn)了明顯變化,通過對(duì)比與探討,研究了 TDA-風(fēng)化料混合料的壓實(shí)機(jī)理。在有側(cè)限的條件下對(duì)TDA-風(fēng)化料混合料進(jìn)行了壓縮試驗(yàn),研究在垂直荷載的作用下,混合料中TDA材料質(zhì)量分?jǐn)?shù)和含水率對(duì)壓縮性能的影響。試驗(yàn)結(jié)果表明,混合料在第一次加載卸載過程中產(chǎn)生的永久性變形量最大,之后的循環(huán)過程中產(chǎn)生的永久性變形量逐漸減小;隨著混合料中TDA材料的增加,試件壓縮回彈曲線的重合度越來越高,壓縮應(yīng)變明顯增大,在外力荷載作用下混合料表現(xiàn)出顯著的沉降變形;含水率在TDA材料含量較低時(shí)對(duì)混合料永久性變形影響較大,隨片體含量的增加混合料對(duì)水的敏感程度逐漸降低。為研究TDA-風(fēng)化料混合料的滲透性,研發(fā)了一種新型的大尺寸變水頭滲透儀,通過滲透試驗(yàn)研究了 TDA材料含量與含水率對(duì)混合料滲透性的影響。試驗(yàn)結(jié)果表明,風(fēng)化料中摻入TDA能夠有效增加混合料的滲透性。在片體含量較低時(shí)混合料在最優(yōu)含水率處滲透性最低,混合料內(nèi)部孔隙率較小,處于密實(shí)狀態(tài);當(dāng)片體含量增大時(shí),滲透系數(shù)明顯變大,混合料滲透性增強(qiáng),且隨含水率的增大,滲透性呈現(xiàn)出增大趨勢。
[Abstract]:Waste tires as a flammable, difficult to degrade materials have a great impact on the natural environment, especially today's rapid economic development, more and more cars. The problem of "black pollution" caused by waste tires is becoming more and more serious. There are many methods to deal with and utilize used tyres, including direct use of tire prototype, landfill, burning of fuel, pyrolysis and retreading. Mechanical crushing, but there are some phenomena such as low recovery rate of waste tires, high energy consumption, secondary pollution in the process of processing and reuse, etc. The rubber resources in our country are scarce. At the same time, the development speed of waste tire comprehensive recycling industry can not keep up with the development speed of automobile manufacturing industry, nor can it adapt to the severe resource and environmental requirements at present, so the waste tire should be properly handled. Reducing the consumption and destruction of resources and environment is a difficult problem to be solved. Referred to as TDAs, they are light in weight, good in durability, hard to degrade, high in strength, good in adsorption and drainage, and mainly used in road subgrade, retaining wall, bridge abutment and anti-frost heaving layer as backfill for road engineering. The adsorption medium or isolation material can improve the bearing capacity of the structure foundation and reduce the settlement deformation. The waste tire can improve the engineering performance of the soil by mixing with the soil. In this paper, TDA and weathered material weathered rock material (WRM) were used to obtain lightweight and high strength materials. Through a series of indoor geotechnical tests, the geotechnical characteristics of TDA-WRM mixture were studied. The mixture with different moisture content was prepared. The dry density change of the mixture under different moisture content was obtained by heavy compaction test with large size compaction equipment. The compaction results showed that. Adding waste tire into weathered material can not only effectively reduce the weight of mixture, but also reduce the amount of water. In addition, with the increase of the mass fraction of waste tire in the mixture. Compared with the compaction curve of weathering material, the compaction curve of mixture has changed obviously, through comparison and discussion. The compaction mechanism of TDA-weathered mixture was studied. The compression test of TDA-weathered mixture was carried out under the condition of side limit, and the effect of vertical load was studied. The effect of TDA material mass fraction and moisture content on the compression performance. The experimental results show that the permanent deformation of the mixture is the largest during the first loading and unloading process. The amount of permanent deformation produced in the later cycle gradually decreases. With the increase of TDA material in the mixture, the coincidence degree of the compression springback curve of the specimen is higher and higher, the compressive strain obviously increases, and the mixture shows significant settlement deformation under the external force load. The moisture content has a great influence on the permanent deformation of the mixture when the content of TDA material is low, and the sensitivity of the mixture to water gradually decreases with the increase of the content of the sheet body. In order to study the permeability of the mixture of TDA-weathering material. A new type of large size variable head permeator was developed. The influence of TDA material content and moisture content on the permeability of mixture was studied by permeation test. The experimental results showed that the permeability of the mixture was influenced by the content of the material and the moisture content of the mixture. Adding TDA into weathering material can effectively increase the permeability of mixture. When the content of sheet body is low, the permeability of mixture is the lowest at the optimum moisture content, and the internal porosity of the mixture is small, and the mixture is in a dense state. With the increase of sheet content, the permeability coefficient increases obviously, the permeability of mixture increases, and the permeability increases with the increase of moisture content.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U414

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