本文選題：砂土固化　切入點(diǎn)：巴氏芽孢桿菌　出處：《巖土力學(xué)》2017年11期 　論文類(lèi)型：期刊論文

【摘要】：砂土固化對(duì)增加砂土強(qiáng)度、減小滲透性極為有利,可提高和改善砂土的力學(xué)特性。通過(guò)培養(yǎng)基L進(jìn)行菌種繁殖,研究了不同條件下的細(xì)菌生長(zhǎng)特性;分析流出液的pH值和Ca~(2+)濃度的內(nèi)在關(guān)系,揭示了固化砂柱的滲透性、無(wú)側(cè)限抗壓強(qiáng)度變化規(guī)律;通過(guò)微觀結(jié)構(gòu)闡釋微生物固化效果,并研究了Ca~(2+)濃度與試樣強(qiáng)度的關(guān)系。結(jié)果表明:2mL細(xì)菌母液加入100mL培養(yǎng)液并在30℃、pH為6,150rpm振動(dòng)速度的條件下最適宜菌種生長(zhǎng);固化過(guò)程中,pH值逐漸降低,而Ca~(2+)濃度則增大;采用0.5mol/L膠凝液固化效果較好且固化周期短;固化后砂土顆粒間孔隙被生成的碳酸鈣填充;試樣滲透性最終降低3~4個(gè)數(shù)量級(jí);流速越小,固化時(shí)間越長(zhǎng),固化效果越好;且固化試樣破壞模式都是脆性破壞;采用尿素和醋酸鈣混合溶液作為膠凝液,更能提高Ca~(2+)利用率。
[Abstract]:The solidification of sand soil is beneficial to increase the strength and decrease the permeability of sand soil, and can improve the mechanical properties of sand soil. The bacteria growth characteristics under different conditions are studied through the propagation of bacteria in culture medium L. The relationship between pH value of effluent and Ca~(2) concentration is analyzed, the permeability of solidified sand column is revealed, the change rule of unconfined compressive strength is revealed, and the solidification effect of microorganism is explained through microstructure. The relationship between the concentration of Ca~(2 and the strength of the sample was studied. The results showed that the strain growth was most suitable under the condition of adding 100 mL of bacterial mother liquor at 30 鈩，

本文編號(hào)：1612871