基于凍結黏土蠕變特性下井壁的受力特性研究
發(fā)布時間：2019-03-12 18:15
【摘要】：對于深厚沖積層的人工凍結法鑿井施工,其安全性大部分決定于凍結壁的強度穩(wěn)定性。因此,凍結壁的穩(wěn)定性研究對工程的成功進展與經濟效益具有十分重要的意義。近年來,研究者們提出了多種對于凍結壁在井壁砌筑前后的穩(wěn)定性分析模型,大部分研究的即為凍結壁與井壁之間的相互作用關系,很少考慮到兩者之間泡沫板的因素。泡沫板作為獨立結構存在于凍結壁與井壁之間,其顯著的改變了在混凝土井壁澆筑初期外壁與凍結壁之間的共同作用關系,改變了凍結壓力的初期增長速率。本文基于對淮南顧北礦副井第一水平埋深處黏土層的研究,結合室內科學試驗,理論計算推導,現(xiàn)場實時監(jiān)測的方法,研究分析了井壁的受力特征及凍結壁、井壁、泡沫板的共同作用關系。 室內試驗主要針對凍土及泡沫板的物理力學性質進行分析,試驗結果表明,凍結黏土的抗壓強度、彈性模量、泊松比與溫度呈線性變化的關系,并根據其蠕變試驗參數(shù)得出本文需要的蠕變回歸方程。聚苯乙烯泡沫板的試驗包括單軸壓縮試驗及單軸蠕變試驗,結果表明,泡沫板的壓縮分為三個階段,即直線變形階段、曲線變形階段和剛性階段。泡沫板的三個不同階段對于凍結壁的分析有著不同的作用。理論分析是基于凍結壁的黏彈塑性特征,采用西元流變模型進行研究,針對泡沫板的三個不同壓縮階段,推導建立出其凍結壁的凍結壓力的計算公式。現(xiàn)場監(jiān)測針對凍結壓力、環(huán)向及豎向受力鋼筋進行監(jiān)測,得出其受力隨著時間的變化規(guī)律。分析結果表明,對于穩(wěn)定蠕變凍結壁,泡沫板的存在不僅降低了外壁的凍結壓力,而且減小了凍結壓力的增長速率,起到緩沖作用。 本文針對于井壁、泡沫板及凍結壁的相互作用機理推導得出凍結壓力的計算公式及其共同作用規(guī)律,對于外層井壁設計及凍結壓力的增長規(guī)律和計算方法提供參考。
[Abstract]:The safety of artificial freezing method for deep alluvial layer is mainly determined by the strength stability of frozen wall. Therefore, the research on the stability of frozen wall is of great significance to the successful progress of the project and the economic benefit. In recent years, researchers have proposed a variety of stability models for frozen walls before and after wall masonry. Most of the researches are on the interaction between frozen walls and shaft walls, and the foam plate between them is seldom taken into account. Foam slab, as an independent structure, exists between freezing wall and shaft wall, which significantly changes the interaction between the outer wall and freezing wall at the initial stage of concrete wall pouring, and changes the initial growth rate of freezing pressure. Based on the study of the clay layer in the first horizontal depth of the auxiliary well of Gubei Mine in Huainan, combined with the scientific experiment in the laboratory, theoretical calculation and derivation, and on-site real-time monitoring, the stress characteristics of the shaft wall, the freezing wall and the shaft wall are studied and analyzed in this paper. The interaction of foam plates. The physical and mechanical properties of frozen soil and foam plate are analyzed in laboratory tests. The results show that the compressive strength, elastic modulus and Poisson's ratio of frozen clay vary linearly with temperature, and the experimental results show that the compressive strength, elastic modulus and Poisson's ratio of frozen clay vary linearly with temperature. According to the creep test parameters, the creep regression equation needed in this paper is obtained. The tests of polystyrene foam plate include uniaxial compression test and uniaxial creep test. The results show that the compression of foam plate is divided into three stages: straight-line deformation stage, curve deformation stage and rigid stage. Three different stages of foam plate play different roles in the analysis of frozen wall. The theoretical analysis is based on the viscoelastic-plastic characteristics of the frozen wall, and the rheological model is used to study it. According to the three different compression stages of the foam plate, the formula for calculating the freezing pressure of the frozen wall of the foam plate is derived and established. In-situ monitoring of frozen pressure, circumferential and vertical stress bars is carried out, and the variation rule of stress with time is obtained. The results show that the presence of foam plate not only reduces the freezing pressure of the external wall, but also decreases the growth rate of the freezing pressure and acts as a buffer for the stable creep frozen wall. In this paper, according to the interaction mechanism of well wall, foam plate and freezing wall, the formula of freezing pressure and its interaction rule are deduced, which can be used as reference for the design of outer shaft wall and the increasing law and calculation method of freezing pressure.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD265.32
本文編號：2439035
[Abstract]:The safety of artificial freezing method for deep alluvial layer is mainly determined by the strength stability of frozen wall. Therefore, the research on the stability of frozen wall is of great significance to the successful progress of the project and the economic benefit. In recent years, researchers have proposed a variety of stability models for frozen walls before and after wall masonry. Most of the researches are on the interaction between frozen walls and shaft walls, and the foam plate between them is seldom taken into account. Foam slab, as an independent structure, exists between freezing wall and shaft wall, which significantly changes the interaction between the outer wall and freezing wall at the initial stage of concrete wall pouring, and changes the initial growth rate of freezing pressure. Based on the study of the clay layer in the first horizontal depth of the auxiliary well of Gubei Mine in Huainan, combined with the scientific experiment in the laboratory, theoretical calculation and derivation, and on-site real-time monitoring, the stress characteristics of the shaft wall, the freezing wall and the shaft wall are studied and analyzed in this paper. The interaction of foam plates. The physical and mechanical properties of frozen soil and foam plate are analyzed in laboratory tests. The results show that the compressive strength, elastic modulus and Poisson's ratio of frozen clay vary linearly with temperature, and the experimental results show that the compressive strength, elastic modulus and Poisson's ratio of frozen clay vary linearly with temperature. According to the creep test parameters, the creep regression equation needed in this paper is obtained. The tests of polystyrene foam plate include uniaxial compression test and uniaxial creep test. The results show that the compression of foam plate is divided into three stages: straight-line deformation stage, curve deformation stage and rigid stage. Three different stages of foam plate play different roles in the analysis of frozen wall. The theoretical analysis is based on the viscoelastic-plastic characteristics of the frozen wall, and the rheological model is used to study it. According to the three different compression stages of the foam plate, the formula for calculating the freezing pressure of the frozen wall of the foam plate is derived and established. In-situ monitoring of frozen pressure, circumferential and vertical stress bars is carried out, and the variation rule of stress with time is obtained. The results show that the presence of foam plate not only reduces the freezing pressure of the external wall, but also decreases the growth rate of the freezing pressure and acts as a buffer for the stable creep frozen wall. In this paper, according to the interaction mechanism of well wall, foam plate and freezing wall, the formula of freezing pressure and its interaction rule are deduced, which can be used as reference for the design of outer shaft wall and the increasing law and calculation method of freezing pressure.
【學位授予單位】：安徽理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD265.32
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