本文選題：固化土　切入點(diǎn)：水泥土　出處：《安徽理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：在如今的工程中,我們一般采用水泥攪拌樁作為樁基礎(chǔ),然而實(shí)踐中發(fā)現(xiàn),當(dāng)工程中遇到了高含水量而且含有機(jī)質(zhì)的淤泥質(zhì)土?xí)r,水泥攪拌樁往往會(huì)出現(xiàn)強(qiáng)度偏低,難以成樁的情況,而且處理成本卻很高,因此有必要選擇新型固化劑代替?zhèn)鹘y(tǒng)水泥。本文主要闡述了軟土增強(qiáng)固化劑的研究現(xiàn)狀和展望,分析了新型固化劑對(duì)土壤的固化機(jī)理,將傳統(tǒng)水泥和固化劑相比較。實(shí)驗(yàn)過程中,室內(nèi)實(shí)驗(yàn)我們采用水泥和固化劑摻量分別為10%、15%、20%,水灰比為1.0、1.5、2.0,分別測(cè)其固化土的無側(cè)限抗壓強(qiáng)度。實(shí)驗(yàn)結(jié)果表明,固化土強(qiáng)度隨著固化劑的摻量增加而增加,然而固化土強(qiáng)度增加速率有所減低,但其強(qiáng)度增加的速率遠(yuǎn)遠(yuǎn)大于水泥[1]。而水灰比卻隨著水灰比的的增大,其固化土的強(qiáng)度減小�，F(xiàn)場實(shí)驗(yàn)是在上海嘉定區(qū)打的旋噴樁,水泥和軟土固化劑的水灰比都選取0.7、1.0,而摻量分別為10%、15%、20%,通過測(cè)定取芯的強(qiáng)度對(duì)比,得出以下結(jié)論:(1)對(duì)于旋噴樁實(shí)驗(yàn),軟土增強(qiáng)固化劑的固化效果明顯優(yōu)于P.042.5號(hào)水泥。(2)通過實(shí)驗(yàn)表明,對(duì)于含砂的土層,軟土增強(qiáng)固化劑固化土強(qiáng)度明顯高于其他土層�，F(xiàn)場試驗(yàn)結(jié)果表明,軟土增強(qiáng)固化劑固化土的取芯強(qiáng)度是水泥土的1.82~2.38倍,施工性能較好,漿液無離析,現(xiàn)場無堵管等。(3)用軟土增強(qiáng)固化劑對(duì)軟土地基進(jìn)行處理,特別是對(duì)高含水量和富含有機(jī)質(zhì)的軟土,比普通水泥加固效果要好[42]。用固化劑對(duì)淺層地基處理時(shí),我們往往可就地取材,節(jié)省大量水泥砂石料費(fèi)用,與一些混凝材料相比,一般可以使材料費(fèi)降到20%~30%,因此值得推廣應(yīng)用。通過室內(nèi)試驗(yàn)和現(xiàn)場實(shí)驗(yàn)證明,用軟土增強(qiáng)固化劑對(duì)軟土地基進(jìn)行處理,特別是對(duì)高含水量和富含有機(jī)質(zhì)的軟土,比普通水泥加固效果要好。用固化劑對(duì)淺層地基處理時(shí),我們往往可就地取材,節(jié)省大量水泥砂石料費(fèi)用,與一些混凝材料相比,一般可以使材料費(fèi)降20%~30%,因此值得推廣應(yīng)用[2]。(1)軟土增強(qiáng)固化劑固化土中鈣礬石含量相對(duì)較高,增加固化土水含量,提高了固化土的早期強(qiáng)度;(2)隨著軟土增強(qiáng)固化劑摻量的增加,固化土強(qiáng)度增加速率有所減低,但其強(qiáng)度增加的速率遠(yuǎn)遠(yuǎn)大于水泥;(3)軟土增強(qiáng)固化劑固化淤泥土,室內(nèi)試驗(yàn)強(qiáng)度是水泥土的1.83~2.78倍,取芯強(qiáng)度是水泥土的1.82~2.38倍,對(duì)含砂高粘土有較好的固化效果。
[Abstract]:In today's projects, we usually use cement mixing pile as pile foundation. However, it is found in practice that the strength of cement mixing pile is low when the silt soil with high water content and organic matter is encountered in the project. It is necessary to choose new curing agent instead of traditional cement because it is difficult to form pile, and the treatment cost is very high. This paper mainly describes the research status and prospect of soft soil reinforcement curing agent, and analyzes the mechanism of the new curing agent to soil. Comparing the traditional cement with the curing agent, in the laboratory experiment, the content of cement and curing agent is 10151520 and the ratio of water to cement is 1.0 ~ 1.5 / 2.0. The unconfined compressive strength of the solidified soil is measured respectively. The strength of solidified soil increases with the increase of the content of curing agent, but the increasing rate of strength of solidified soil decreases, but the increasing rate of strength of solidified soil is far greater than that of cement [1]. However, the water-cement ratio increases with the increase of water-cement ratio. The strength of the solidified soil is reduced. The field test is based on the rotary jet pile in Jiading District of Shanghai. The cement and soft soil curing agent's water-cement ratio is chosen as 0.71.0, while the content of cement is 100.15% and 20%, respectively. By comparing the strength of the core, the following conclusion: 1) for the rotary jet pile experiment, The solidification effect of soft soil reinforced curing agent is obviously better than that of P.042.5 cement. Through experiment, it is shown that for sandy soil layer, the strength of soft soil reinforced curing agent is obviously higher than that of other soil layers. The field test results show that the solidification strength of soft soil reinforcement hardener is obviously higher than that of other soil layers. The coring strength of solidified soil reinforced with soft soil is 1.822 / 2.38 times of that of cement soil, and the construction performance is better, the slurry is not segregated, and there is no plugging pipe in the field, etc.) the soft soil strengthening and curing agent is used to treat the soft soil foundation. Especially for soft soil with high water content and rich in organic matter, it is better than ordinary cement to reinforce the shallow foundation. When treating shallow foundation with curing agent, we can often use local materials, save a lot of cost of cement sand and stone, and compare with some coagulant. In general, the cost of materials can be reduced to 20% and 30%, so it is worth popularizing and applying. Through laboratory and field experiments, it has been proved that soft soil foundation is treated with soft soil reinforcement and curing agent, especially for soft soil with high water content and rich in organic matter. When treating shallow foundation with curing agent, we can often use local materials to save a lot of cost of cement sand and stone, compared with some coagulant, In general, the cost of materials can be reduced by 20% and 30%, so it is worth popularizing and applying [2]. 1) the content of ettringite in the solidified soil is relatively high, the water content of the solidified soil is increased, and the early strength of the solidified soil is increased with the increase of the content of the reinforced curing agent in the soft soil. The increasing rate of strength of solidified soil is decreased, but the increasing rate of strength of solidified soil is much higher than that of cement-soil (3)) the strength of laboratory test is 1.83 times of that of cement-soil, and the core strength is 1.82 ~ 2.38 times of that of cement-soil. It has good curing effect on high sand clay.
【學(xué)位授予單位】：安徽理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU472

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