本文選題：毛細(xì)阻滯 + 封場(chǎng)覆蓋��； 參考：《北京交通大學(xué)》2017年碩士論文

【摘要】：毛細(xì)阻滯型覆蓋層是一種新型的垃圾填埋場(chǎng)封場(chǎng)覆蓋形式,其防滲機(jī)理,計(jì)算模型,設(shè)計(jì)參數(shù)都有待進(jìn)一步的研究。本論文為研究毛細(xì)阻滯型覆蓋層的滲透行為,研發(fā)了常規(guī)毛細(xì)阻滯型覆蓋層土柱試驗(yàn)裝置和帶抽吸作用的土柱試驗(yàn)裝置。采用新研發(fā)的土柱試驗(yàn)裝置進(jìn)行了均勻土柱,毛細(xì)阻滯型土柱,抽吸作用土柱的降雨入滲試驗(yàn),試驗(yàn)結(jié)果表明:(1)新研發(fā)的常規(guī)毛細(xì)阻滯型覆蓋層土柱試驗(yàn)裝置和帶抽吸作用的土柱試驗(yàn)裝置設(shè)計(jì)合理,工作狀態(tài)良好,能夠滿足毛細(xì)阻滯型覆蓋層的滲透行為研究的需要;(2)改進(jìn)了濕潤(rùn)鋒前進(jìn)法。發(fā)現(xiàn)肉眼可觀測(cè)的濕潤(rùn)鋒并不是濕潤(rùn)鋒前進(jìn)法使用的必要條件,通過(guò)傳感器識(shí)別濕潤(rùn)鋒是可行的,并且計(jì)算精度滿足非飽和滲透系數(shù)測(cè)量的要求。這一改進(jìn)突破了原有濕潤(rùn)鋒前進(jìn)法中依賴肉眼觀測(cè)濕潤(rùn)鋒的局限性,大大拓展了這一方法的適用范圍,并且更加的方便準(zhǔn)確;(3)毛細(xì)阻滯型覆蓋層的擊穿時(shí)間和毛細(xì)阻滯覆蓋層細(xì)粒土厚度、細(xì)粒土初始含水率、降雨強(qiáng)度等有關(guān),且分別呈線性正相關(guān)、線性負(fù)相關(guān)、冪函數(shù)負(fù)相關(guān)關(guān)系;(4)基于試驗(yàn)數(shù)據(jù),建立了一個(gè)簡(jiǎn)化的毛細(xì)阻滯型覆蓋層細(xì)粒土層儲(chǔ)水能力及界面擊穿時(shí)間的計(jì)算模型,該模型計(jì)算結(jié)果和試驗(yàn)結(jié)果一致;(5)基于毛細(xì)阻滯覆蓋層細(xì)粒土層的儲(chǔ)水能力及界面擊穿時(shí)間計(jì)算模型,提出了垃圾填埋場(chǎng)毛細(xì)阻滯覆蓋層細(xì)粒土層的設(shè)計(jì)原則,并針對(duì)濕潤(rùn)地區(qū)、半濕潤(rùn)地區(qū)、干旱地區(qū)、半干旱地區(qū)的4個(gè)代表性案例,給出的了具體的參數(shù)設(shè)計(jì);(6)初步進(jìn)行了帶抽吸層與不帶抽吸層的毛細(xì)阻滯土柱的對(duì)比試驗(yàn),證明在毛細(xì)阻滯土柱粗粒土層側(cè)面加細(xì)粒土層,能起到引流效果,起到延緩擊穿時(shí)間的作用。
[Abstract]:Capillary barrier overlay is a new type of landfill seal covering. Its seepage prevention mechanism, calculation model and design parameters need to be further studied. In order to study the permeation behavior of capillary retarded overburden, the conventional capillary block soil column test device and the soil column test device with suction action were developed in this paper. The rainfall infiltration test of homogeneous soil column, capillary block soil column and suction soil column was carried out with the newly developed soil column test device. The experimental results show that: (1) the newly developed conventional capillary-block soil column test device and the soil column test device with suction action are reasonably designed and in good working condition. It can meet the needs of the study of permeability behavior of capillary block overlay. (2) the wetting front advance method is improved. It is found that the observable wetting front with the naked eye is not a necessary condition for the wetting front forward method. It is feasible to identify the wetting front by the sensor, and the accuracy of calculation can meet the requirements of unsaturated permeability coefficient measurement. This improvement breaks through the limitation of the former wet front forward method which relies on the naked eye to observe the wetting front, and greatly expands the scope of application of this method. And more convenient and accurate. (3) the breakdown time of capillary block cover is related to the thickness of fine soil, initial moisture content of fine soil, rainfall intensity and so on, and is linear positive correlation, linear negative correlation, respectively. (4) based on the experimental data, a simplified model for calculating the water storage capacity and interfacial breakdown time of fine grained soil layer of capillary retarded layer is established. The calculated results of the model are consistent with the experimental results. (5) based on the calculation model of water storage capacity and interface breakdown time of capillary retarded fine soil layer, the design principle of capillary blocking fine soil layer of landfill site is put forward. According to the four typical cases of humid, semi-humid, arid and semi-arid areas, the specific parameter design is given. (6) the comparative test of capillary block soil column with and without suction layer is carried out. It is proved that adding fine soil layer to the side of coarse soil layer of capillary block soil column can play a drainage effect and delay the breakdown time.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 夏平;蔣建清;蔡晶W，

本文編號(hào)：2053212