本文關(guān)鍵詞： 風(fēng)積沙墊層 軟弱地基 工程特性 加固技術(shù) 路基沉降　出處：《河北工業(yè)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：針對河套地區(qū)軟弱地基基底換填采用風(fēng)積沙替代砂礫進(jìn)行碾壓的加固處理問題，眾多學(xué)者采用砂礫墊層、沖擠密法、強(qiáng)夯法、拋石擠淤法及其它化學(xué)方法等解決軟地基基底換填處理，，但涉及研究利用風(fēng)積沙加固處理軟地基的應(yīng)用技術(shù)幾乎為空白。本課題作者采用風(fēng)積沙替代砂礫用于河套地區(qū)沼澤洼地、濕地軟地基基底換填的加固處理技術(shù)進(jìn)行研究，取得了如下研究成果與結(jié)論： ①對河套地區(qū)庫布其沙區(qū)路用風(fēng)積沙的物理特性和工程特性進(jìn)行研究，得出了河套地區(qū)風(fēng)積沙的天然級配、天然干燥狀態(tài)下含水量、不均勻系數(shù)、曲率系數(shù)、細(xì)度模數(shù)、CBR值、回彈模量、壓縮性能，并對水理特性也做了必要的研究。 ②河套地區(qū)沼澤洼地、濕地等軟地基特點：地下水位高、路基地基的抗剪強(qiáng)度小、承載力較低；針對其地基特點對試驗路段K936+800~K937+300不同路段的地基加固方法及施工工藝進(jìn)行研究：試驗路段K936+800~K937+250基底采用填筑風(fēng)積沙進(jìn)行碾壓的加固方法；試驗路段K937+250~K937+300基底采用鋪設(shè)砂礫進(jìn)行碾壓的加固方法，目的是為了與設(shè)置風(fēng)積沙加固段進(jìn)行效果對比。 ③動態(tài)監(jiān)測試驗段K936+800~K937+300路基軟土地基不同加固處理后地基沉降與穩(wěn)定性，實驗結(jié)果表明：觀測到的路堤各沉降板的日沉降量及路基坡腳邊樁位移速率均遠(yuǎn)小于路基填筑施工期的控制標(biāo)準(zhǔn)，反映出該段軟地基經(jīng)設(shè)置換填風(fēng)積沙加固處理是科學(xué)的、可行的，能完全滿足路基施工要求。 ④對試驗路段K936+800~K937+300不同路段的加固處理方法進(jìn)行數(shù)值模擬計算研究，結(jié)果顯示：風(fēng)積沙和砂礫處理河套地區(qū)軟地基基底與實驗結(jié)果比較吻合，應(yīng)用風(fēng)積沙替代砂礫加固處理河套地區(qū)軟地基基底是可行的。 結(jié)論認(rèn)為：通過實驗和理論方面研究，風(fēng)積沙可以替代砂礫作為河套地區(qū)軟地基基底的加固材料。 研究成果將用于河套地區(qū)沼澤濕地和沙漠地區(qū)基底處理方面，起到降低工程造價、取材方便、縮短施工工期和保護(hù)環(huán)境等作用。
[Abstract]:In view of the Hetao area soft foundation base for reinforcement problems filled with aeolian sand gravel instead of rolling, many scholars used gravel cushion, punching compaction method, dynamic compaction, riprap compaction and other chemical methods to solve the replacement treatment of soft foundation, but involves the study of eolian sand reinforcement application technology the soft foundation is almost blank. The author uses the aeolian sand gravel replacement for Hetao area wetland marsh depressions, soft foundation base for filling reinforcement technology research, we got the following results and conclusions:
The physical characteristics of the Shaqulu khub Hetao area with aeolian sand and the engineering characteristic of the natural gradation in Hetao area of eolian sand, natural drying condition of moisture content, uniformity coefficient, coefficient of curvature, fineness modulus, CBR value, modulus of resilience, compression performance, and also do the necessary study on water physical properties.
The Hetao area of marsh depressions, wetlands and other characteristics of soft foundation, high underground water level and small shear strength of subgrade foundation, bearing capacity is low; research on method and construction technology for strengthening the foundation of foundation on the test section of K936+800~K937+300 characteristics of different sections: strengthening method of test section of K936+800~K937+250 substrate used to fill the aeolian sand compaction; the test section K937+250~K937+300 substrate by using the reinforcement method of laying gravel compaction, the purpose is to set up and Sharjah aeolian solid section to compare the effects.
K936+800~K937+300 soft subgrade test section of the dynamic monitoring of different reinforcement foundation settlement and stability of embankment, the experimental results show that the measured settlement plates on the settlement of the embankment slope and side pile displacement rate is far smaller than the control standard of subgrade construction period, reflecting the soft foundation by setting the replacement of aeolian sand reinforcement is scientific and feasible, can fully meet the requirements of subgrade construction.
Numerical simulation research, strengthening method for the K936+800~K937+300 test sections of different sections of the results showed that: compared with aeolian sand and gravel processing in Hetao area soft ground base and experimental results, the application of aeolian sand gravel replacement is feasible reinforcement of soft foundation in Hetao area basement.
The conclusion is that, through experimental and theoretical studies, aeolian sand can be used as a reinforcement material for the soft foundation of the Hetao area.
The research results will be applied to the treatment of substrate in marsh and desert area of Hetao area, which can reduce project cost, facilitate material acquisition, shorten construction period and protect environment.

【學(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU472

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