本文選題：膨脹性凝灰?guī)r　切入點：CPAM　出處：《長沙理工大學(xué)》2014年碩士論文

【摘要】：云南瀾滄鉛礦礦區(qū)斷層褶皺發(fā)育,地層中多含膨脹性凝灰?guī)r。凝灰?guī)r中含有大量的粘土礦物,遇水膨脹,易軟化崩解,是一種帶有特殊工程特性的軟巖。對于此類巖體的防治,常采用改性劑對粘土礦物進行改性,防止其水化膨脹,同時采用錨噴網(wǎng)支護的方法提高圍巖的穩(wěn)定性能。但一般的粘土改性劑都是小分子量的,多用于石油助劑,對于礦山膨脹性圍巖的防滲堵水研究較少,且小分子量的粘土改性劑對于大孔隙的膨脹巖體填充封堵效果較差；又膨脹巖體因遭受周圍環(huán)境的持續(xù)破壞,與支護措施之間失去穩(wěn)定聯(lián)接,如此支護措施往往起不到應(yīng)有的效果�；诖�,本文創(chuàng)造性的提出采用高分子量的陽離子型聚丙烯酰胺(簡稱CPAM),針對瀾滄鉛礦膨脹性凝灰?guī)r進行改性,同時采用CPAM+水泥復(fù)合漿對其進行注漿加固,提高巖體整體穩(wěn)定性能。本文通過實驗驗證與理論分析,取得了如下主要研究成果：1通過自由膨脹率實驗與凝灰?guī)r崩解物級配實驗發(fā)現(xiàn),CPAM改性液相較其他粘土改性劑而言,具有更為穩(wěn)定、持久、優(yōu)良的抑膨性能。CPAM改性液中的凝灰?guī)r基本不膨脹崩解,最佳抑膨濃度為0.08%。2對不同濃度、不同溫度下的CPAM溶液粘度進行了測定分析,得出CPAM漿液粘度與濃度之間近似成對數(shù)關(guān)系,受濃度影響很大,受溫度影響小的結(jié)論。并對CPAM漿液粘度與濃度和溫度之間的關(guān)系進行了數(shù)值擬合。3通過復(fù)合漿試塊的點荷載實驗,得出CPAM溶液濃度為0.06%,水灰比為0.45的復(fù)合漿試塊抗壓強度最高,相對無改性劑的水泥凈漿試塊提強33.7%。4模擬工程實際,自制模擬注漿儀,并對凝灰?guī)r樣品進行了模擬化學(xué)注漿。采用微距拍攝、掃描電鏡與能譜分析相結(jié)合的方法,對注漿后試塊的擴散效果進行了實驗分析,結(jié)果表明CPAM改性液可注性良好、漿液擴散較充分,且對于本實驗材料而言,無圍壓模擬注漿的適宜壓強為0.6MPa。同時,對注漿后試塊進行了點荷載實驗,結(jié)果表明CPAM水溶液不僅不會對凝灰?guī)r的強度造成損傷,反而有小量的提升。5針對瀾滄鉛礦巷道失穩(wěn)問題提出了有針對性的穩(wěn)定性控制方案,集中表現(xiàn)為“控水”和“補強”兩種手段,并對常規(guī)注漿管進行了改進。
[Abstract]:The fault folds are developed in Lancang lead ore area of Yunnan Province, and there are many expansive tuff in strata. Tuff contains a lot of clay minerals. It is a kind of soft rock with special engineering characteristics because of water swelling, easy to soften and disintegrate, so it is a kind of soft rock with special engineering characteristics. The modifier is often used to modify clay minerals to prevent hydration and expansion, and to improve the stability of surrounding rock by bolting and shotcreting mesh. However, the common clay modifiers are small molecular weight and are mostly used as petroleum auxiliaries. There are few researches on seepage and water plugging of expansive rock mass in mine, and the small molecular weight clay modifier has poor effect on filling and plugging of expansive rock mass with large pores, and expansive rock mass is continuously destroyed by surrounding environment. The loss of a stable connection with the supporting measures, which often do not have the desired effect. In this paper, cationic polyacrylamide of high molecular weight (CPAM) is used to modify the expansive tuff of Lancang lead mine, and CPAM cement composite slurry is used to reinforce it. In this paper, through experimental verification and theoretical analysis, we have obtained the following main research results: 1. Through free expansion test and tuff disintegration gradation experiment, we find that CPAM modified liquid phase is better than other clay modifiers. The tuff in the modified solution of CPAM is stable, durable and stable. The viscosity of the CPAM solution with different concentration and temperature is determined and analyzed by the optimum inhibition concentration of 0.082.The swelling of the tuff in the modified solution is not collapsible. It is concluded that the relationship between viscosity and concentration of CPAM slurry is approximately logarithmic, which is greatly affected by the concentration. The relationship between the viscosity of CPAM slurry and the concentration and temperature was numerically fitted. 3. Through the point load experiment of the composite slurry, it was concluded that the compressive strength of the composite slurry was the highest when the concentration of CPAM solution was 0.06 and the ratio of water to cement was 0.45, and the results showed that the strength of the composite slurry was the highest when the concentration of CPAM solution was 0.06 and the ratio of water to cement was 0.45. Compared with the cement paste test block without modifier, the cement paste test block is strengthened 33.7.4 simulation engineering practice, self-made simulated grouting instrument, and the tuff sample was simulated by chemical grouting. The method of micro-shooting, scanning electron microscope and energy dispersive analysis was used. The experimental results show that the CPAM modified liquid has good injectability and sufficient slurry diffusion, and the suitable pressure for simulating grouting without confining pressure is 0.6 MPA for the material in this experiment. The point load experiments on the test blocks after grouting are carried out. The results show that CPAM aqueous solution not only does not damage the strength of tuff, but also has a small amount of lifting. 5. Aiming at the problem of roadway instability in Lancang lead Mine, a targeted stability control scheme is put forward. The two methods of "water control" and "reinforcement" are concentrated, and the conventional grouting pipe is improved.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU45

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本文編號：1693634