秸稈體系在真空預(yù)壓排水下數(shù)值模擬及工程應(yīng)用
本文選題:吹填土 + 秸稈; 參考:《安徽理工大學(xué)》2017年碩士論文
【摘要】:隨著加大沿海開發(fā)的進(jìn)程,在沿海軟土地區(qū)工程建設(shè)中,處置浮泥,流泥狀超軟土的問題很常見,新近吹填土多為浮泥~流泥狀超軟土,承載力幾乎為0,人員和機(jī)械設(shè)備無法進(jìn)場。面對如此超軟土地基,常采用淺層加固后再深層處理的方法。淺層加固常采用自然晾曬法、化學(xué)固化法、真空預(yù)壓法等。后期深層處理常采用打樁或深層攪拌法。另一方面,農(nóng)村農(nóng)作物秸稈的處置問題已成為我國大氣環(huán)境保護(hù)亟需解決的難題。基于上述因素,提出將傳統(tǒng)真空排水固結(jié)法中的砂墊層及塑料排水板用廢棄的秸稈作為排水材料代替。以棉花秸稈和東臺(tái)工程中產(chǎn)生的超軟土為研究對象,基于室內(nèi)試驗(yàn)、模型試驗(yàn)基礎(chǔ)上,再進(jìn)行數(shù)值模擬分析、現(xiàn)場試驗(yàn)等手段,對秸稈的滲透性能、新型秸稈排水系統(tǒng)固結(jié)處理超軟土的處理效果及影響因素進(jìn)行了的研究,提出了完整的應(yīng)用技術(shù),本文研究成果簡述如下:(1)通過秸稈捆固結(jié)排水性能的模型實(shí)驗(yàn)和數(shù)值模擬實(shí)驗(yàn)研究,揭示了秸稈捆直徑、密度、間距、排列方式對固結(jié)排水效果的影響規(guī)律。(2)通過運(yùn)用ABAQUS有限元軟件進(jìn)行數(shù)值模擬分析,對新型秸稈排水系統(tǒng)關(guān)鍵設(shè)計(jì)參數(shù)的性能進(jìn)行仿真研究。通過明確秸稈捆的直徑、密度、間距、井徑比、排列方式等因素對固結(jié)排水效果的綜合影響規(guī)律,通過計(jì)算得出,影響固結(jié)排水效果的主要因素為秸稈捆的直徑和秸稈捆之間的間距。(3)基于現(xiàn)場應(yīng)用研究,自行研制了便利高效地秸稈捆制作設(shè)備,提出了秸稈捆制作與打設(shè)、秸稈毯制作與鋪設(shè),真空排水輔助系統(tǒng)連接,密封膜鋪設(shè)等工序的施工方法,最后形成了完整的新型秸稈排水系統(tǒng)固結(jié)處理高含水率超軟土的施工工藝。(4)通過現(xiàn)場試驗(yàn),驗(yàn)證了新型秸稈排水系統(tǒng)處理浮泥、流泥狀超軟土的效果。同時(shí),從經(jīng)濟(jì)、技術(shù)、社會(huì)效應(yīng)等方面證明了新型秸稈排水系統(tǒng)固結(jié)高含水率吹填土應(yīng)用技術(shù)比設(shè)計(jì)資料中采取的晾曬+摻灰+碾壓回填法更為優(yōu)越,具有良好的社會(huì)效應(yīng)和應(yīng)用前景。
[Abstract]:With the process of increasing coastal development, in the construction of coastal soft soil area, the problem of disposal of floating mud and flowing mud super soft soil is very common, and most of the newly blown fill soils are floating mud to flowing mud super soft soil. Bearing capacity is almost zero, personnel and mechanical equipment can not enter the field. In the face of such super soft soil foundation, shallow layer reinforcement and deep treatment are often adopted. Natural drying, chemical curing, vacuum preloading and so on are often used in shallow layer reinforcement. In the later stage of deep treatment, piling or deep mixing is often used. On the other hand, the disposal of crop stalks in rural areas has become a difficult problem to be solved in China's atmospheric environment protection. Based on the above factors, the sand cushion and plastic drainage board in traditional vacuum drainage consolidation method are replaced by waste straw as drainage material. Taking the super soft soil produced by cotton straw and Dongtai engineering as the research object, based on indoor test, model test, numerical simulation analysis, field test and other means, the permeability of straw was studied. The treatment effect and influencing factors of consolidation treatment of super soft soil by new straw drainage system were studied, and the complete application technology was put forward. The research results of this paper are summarized as follows: (1) the diameter, density, spacing of straw bundles are revealed through model and numerical simulation experiments on the consolidation and drainage performance of straw bundles. The effect of arrangement on consolidation and drainage effect. (2) the performance of key design parameters of new straw drainage system was simulated and analyzed by using ABAQUS finite element software. By clarifying the comprehensive influence law of the diameter, density, spacing, well diameter ratio and arrangement of straw bundles on the consolidation and drainage effect, it is obtained by calculation, The main factors affecting the consolidation and drainage effect are the diameter of straw bundles and the spacing between straw bundles. Based on the field application research, a convenient and efficient equipment for making straw bundles is developed, and the making and setting of straw bundles are put forward. The construction methods of straw blanket manufacture and laying, vacuum drainage auxiliary system connection, sealing membrane laying and so on, finally formed a complete new straw drainage system consolidation and treatment of super soft soil with high moisture content. The effect of the new straw drainage system on the treatment of floating mud and fluid-mud super soft soil was verified. At the same time, from the aspects of economy, technology and social effect, it is proved that the application technology of new straw drainage system with high moisture content is superior to the method of drying, mixing ash and rolling compacted backfill in the design data. It has good social effect and application prospect.
【學(xué)位授予單位】:安徽理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU472.33
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