本文選題：凍結(jié)法鑿井 + 凍結(jié)壁　； 參考：《安徽理工大學(xué)》2017年碩士論文

【摘要】：井壁凍結(jié)壓力是凍結(jié)法鑿井的重要技術(shù)參數(shù),它決定凍結(jié)壁與井壁的結(jié)構(gòu)設(shè)計(jì)是否科學(xué)合理,涉及施工安全。本文以位于我國淮南的楊村礦副井作為工程背景,通過理論推導(dǎo)、現(xiàn)場實(shí)測與試驗(yàn)相互驗(yàn)證的方法,探討了井壁與凍結(jié)壁相互作用時(shí)凍結(jié)壓力的分布規(guī)律。首先,根據(jù)周圍土體、凍結(jié)壁及井壁相互作用機(jī)理,采用彈塑性理論得到不同DP準(zhǔn)則下的凍結(jié)壓力解析解,并分析了不同DP準(zhǔn)則對(duì)凍結(jié)壓力結(jié)果的影響。分析結(jié)果表明,在深井井壁開挖之后,凍結(jié)壁凍結(jié)壓力變化規(guī)律分為快速增長、緩慢增長及逐漸穩(wěn)定階段。DP1準(zhǔn)則屈服條件下所對(duì)應(yīng)的凍結(jié)壓力最大,DP5準(zhǔn)則屈服時(shí)所對(duì)應(yīng)的凍結(jié)壓力最小,即利用DP1、DP3、DP4、DP6、DP2、DP5準(zhǔn)則進(jìn)行凍結(jié)壁設(shè)計(jì)時(shí)的安全性依次增強(qiáng)。其次,基于西原體模型流變理論,建立了凍結(jié)壁-泡沫板-外壁三維力學(xué)場模型,推導(dǎo)出在黏彈性與黏彈塑性兩種狀態(tài)下的凍結(jié)壓力計(jì)算公式,對(duì)井壁設(shè)計(jì)、凍結(jié)壓力計(jì)算與增長規(guī)律提供理論支撐。最后,利用現(xiàn)場實(shí)驗(yàn)結(jié)果得到計(jì)算參數(shù),將工程實(shí)測值與理論計(jì)算結(jié)果進(jìn)行對(duì)比,結(jié)果表明理論計(jì)算公式能較好描述井壁凍結(jié)壓力的增長規(guī)律,證明凍結(jié)壓力解析解的合理性。同時(shí)還得出,深層位井壁凍結(jié)壓力發(fā)展有一個(gè)遲緩期,凍結(jié)壓力隨地層深度的增加而增大,同時(shí)隨時(shí)間的增大而增大。通過比較可知理論計(jì)算與現(xiàn)場實(shí)測的凍結(jié)壓力變化趨勢大致相似,而兩者不同之處在于凍結(jié)壓力理論值到達(dá)最高峰的時(shí)間早于現(xiàn)場實(shí)測的凍結(jié)壓力值。此外,文中還分析了平面應(yīng)變解析問題的弊端。本文結(jié)論可為凍結(jié)法鑿井井壁與凍結(jié)壁設(shè)計(jì)以及工程現(xiàn)場施工提供理論參考依據(jù)。
[Abstract]:The freezing pressure of shaft wall is an important technical parameter of freezing sinking. It determines whether the structural design of freezing wall and shaft wall is scientific and reasonable and involves the safety of construction. Taking the auxiliary well of Yangcun Mine located in Huainan of China as the engineering background, the distribution of freezing pressure in the interaction of shaft wall and frozen wall is discussed by theoretical derivation, field measurement and test. Firstly, according to the interaction mechanism of surrounding soil, freezing wall and well wall, the analytical solutions of freezing pressure under different DP criteria are obtained by using elastoplastic theory, and the influence of different DP criteria on the freezing pressure results is analyzed. The analysis results show that after deep well wall excavation, the change of freezing pressure of freezing wall is divided into rapid growth. At the stage of slow growth and gradual stabilization, the maximum freezing pressure corresponding to the maximum freezing pressure under the yield condition of the DP1 criterion is the smallest, that is, the security of the freezing wall design using DP1 / DP3 / DP4 / DP4 / DP6 / DP2 / DP5 criterion is enhanced in turn. Secondly, based on the rheological theory of Cycloplasma model, the three-dimensional mechanical field model of frozen wall, foam plate and outer wall is established, and the calculation formula of freezing pressure under two states of viscoelasticity and viscoelastic-plastic is deduced, and the shaft wall is designed. The calculation and growth of freezing pressure provide theoretical support. Finally, the calculated parameters are obtained by using the field experiment results, and the engineering measured values are compared with the theoretical calculation results. The results show that the theoretical calculation formula can better describe the growth law of the freezing pressure of the shaft wall and prove the rationality of the analytical solution of the freezing pressure. At the same time, it is also found that there is a slow period of freezing pressure development in deep wellbore. The freezing pressure increases with the increase of the depth of the layer, and increases with the increase of time. The comparison shows that the variation trend of freezing pressure between theoretical calculation and field measurement is approximately similar, but the difference between them is that the theoretical value of freezing pressure reaches the highest peak earlier than the field measured freezing pressure. In addition, the disadvantages of plane strain analysis are analyzed. The conclusion of this paper can provide a theoretical reference for the design of shaft wall and freezing wall of freezing method and the construction of engineering site.
【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)】：TD265.3

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