本文選題：人工凍結法 + 含鹽量��； 參考：《安徽建筑大學》2014年碩士論文

【摘要】：近年來，隨著人工凍結法鑿井深度的增加，凍結管斷管事故時有發(fā)生，主要存在井幫位移大，凍結管斷裂，工作面底鼓等問題。目前國內(nèi)對深土凍土的研究基本以砂土和粉土為研究對象，而本工程楊村礦是鈣質(zhì)粘土，，很少有人對此課題開展研究，其理論方面的研究還有不少空白，為了了解由于凍結管的斷裂后導致凍結液的滲漏對周邊土層強度的影響。特以淮南楊村礦鈣質(zhì)粘土為研究對象，對淮南楊村煤礦副井井筒的典型土層鈣質(zhì)粘土在低溫條件下的力學特性開展實驗研究。 （1）通過凍土單軸抗壓強度試驗，研究淮南楊村礦鈣質(zhì)粘土的凍結強度與溫度、含鹽量和含水率之間的變化關系。分析了淮南楊村礦鈣質(zhì)粘土在含鹽凍結條件下的彈性模量以及泊松比隨溫度和含鹽量的變化規(guī)律。 （2）含鹽量影響下鈣質(zhì)粘土應力應變關系的建立，通過單軸單軸抗壓強度的試驗得到應力與應變的關系曲線，通過分析建立以含鹽率為影響因子的鈣質(zhì)粘土應力應變關系模型。 （3）通過飽和未含鹽與飽和含鹽凍凍結土的強度分析，得到了飽和未含鹽凍結土強度是飽和含鹽之間存在倍數(shù)關系，建立了在一定溫度下飽和未含鹽與含鹽凍土強度公式。 （4）以試驗為基礎，根據(jù)正交試驗設計，對多種影響下凍土力學性能的因素水平進行試驗安排，試驗得到了凍土力學性能與多種影響因素的主次關系。 （5）凍土蠕變試驗在WDT-100微機控制凍土壓力試驗機進行，對淮南楊村礦的鈣質(zhì)粘土蠕變特性進行了研究，建立了相應的鈣質(zhì)粘土蠕變模型。 （6）通過蠕變試驗，研究了0%、4%、4.5%、5%、5.5%鹽分凍結土的蠕變常數(shù)A,B,C與溫度的變化關系，并比較分析了在-10℃-15℃溫度范圍內(nèi)，0%、4%、4.5%、5%、5.5%鹽分的蠕變常量A，B,C的變化和鹽分之間的關系。
[Abstract]:In recent years, with the increase of the depth of shaft sinking by artificial freezing method, the accidents of freezing pipe break occur from time to time. There are many problems such as the large displacement of shaft side, the fracture of frozen pipe, the bottom drum of working face and so on. At present, the research on deep frozen soil in China basically takes sandy soil and silt as the research object, but the Yangcun mine of this project is calcareous clay, so few people have carried out research on this subject, and there are still many gaps in the theoretical research. In order to understand the influence of the leakage of frozen liquid on the strength of the surrounding soil layer due to the breakage of the frozen pipe. Taking calcareous clay of Yangcun mine in Huainan as the research object, the mechanical properties of calcareous clay in typical soil layer of auxiliary shaft of Huainan Yangcun Coal Mine at low temperature were studied experimentally. (1) uniaxial compressive strength test of frozen soil was carried out. The relationship between freezing strength, temperature, salt content and moisture content of calcareous clay in Yangcun Mine, Huainan is studied. The changes of elastic modulus and Poisson's ratio with temperature and salt content of calcareous clay in Yangcun Mine, Huainan are analyzed. (2) the relationship between stress and strain of calcareous clay affected by salt content is established. The relation curve between stress and strain is obtained by uniaxial compressive strength test. The stress-strain relationship model of calcareous clay with salt content as the influence factor was established by analyzing. (3) the strength analysis of frozen soil without saturated salt and saturated salt was carried out. The relationship between the strength of saturated frozen soil without salt and that of saturated frozen soil is obtained, and the formula of strength of saturated frozen soil without salt and salt at certain temperature is established. (4) based on the experiment and the orthogonal test design, The main and secondary relationships between the mechanical properties of permafrost and various influencing factors are obtained. (5) the creep test of frozen soil is carried out on a WDT-100 microcomputer controlled permafrost pressure tester. The creep characteristics of calcareous clay in Yangcun Mine, Huainan, are studied, and the corresponding creep model of calcareous clay is established. (6) through creep test, the relationship between temperature and creep constant Anb _ (C) of 0.5% salt frozen soil is studied. The relationship between the change of creep constant of 5.5% salt and the salt content is compared and analyzed in the temperature range of -10 鈩

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