黏土中板形重力安裝錨和吸力式安裝平板錨的旋轉(zhuǎn)調(diào)節(jié)過(guò)程
發(fā)布時(shí)間：2018-07-31 08:03
【摘要】：隨著石油／天然氣的開發(fā)走向深海,海上油氣開采平臺(tái)面臨日益惡劣的工作環(huán)境。采油平臺(tái)的失事會(huì)造成巨大的經(jīng)濟(jì)損失和嚴(yán)重的人員傷亡。錨固系統(tǒng)作為深海油氣開采平臺(tái)的重要組成部分,對(duì)保證平臺(tái)安全運(yùn)行具有關(guān)鍵作用。越來(lái)越深的開發(fā)水域?qū)﹀^固系統(tǒng)提出了新的要求,錨固系統(tǒng)也逐漸由傳統(tǒng)的重力式基礎(chǔ)結(jié)構(gòu)發(fā)展到由錨和錨鏈構(gòu)成的懸鏈線系統(tǒng)。由于安裝簡(jiǎn)便且安全可靠,板形重力安裝錨和吸力式安裝平板錨在海洋工程中得到了廣泛應(yīng)用。但是對(duì)于這兩種板形錨(錨板)在深海黏土中應(yīng)用時(shí)的性能,還沒有得到充分的認(rèn)識(shí)。錨安裝完成時(shí)的姿態(tài)與最終承力時(shí)的姿態(tài)是不同的,錨要經(jīng)過(guò)一個(gè)旋轉(zhuǎn)調(diào)節(jié)過(guò)程來(lái)達(dá)到最終承力姿態(tài)。這個(gè)調(diào)節(jié)過(guò)程將導(dǎo)致錨埋深的損失,從而降低錨的承載能力,而抗拔承載力是錨板設(shè)計(jì)的要點(diǎn),也是海洋工程研究領(lǐng)域的熱點(diǎn)和基礎(chǔ)問(wèn)題。因此,對(duì)錨板旋轉(zhuǎn)調(diào)節(jié)過(guò)程及其承載力特性的研究具有重要的理論意義和應(yīng)用價(jià)值。本文以板形重力安裝錨(Gravity Installed Plate Anchor-GIPLA)和吸力式安裝平板錨(Suction Embedded Plate Anchor-SEPLA)為對(duì)象,采用塑性分析方法對(duì)黏土中錨的旋轉(zhuǎn)調(diào)節(jié)過(guò)程和承載力特性問(wèn)題進(jìn)行了研究。研究結(jié)果與三維大變形有限元(Three-dimensional Large Deformation Finite Element-3D-LDFE)分析方法的結(jié)果進(jìn)行對(duì)比。并用塑性分析方法研究了上拔傾角和錨眼偏移角對(duì)埋深和承載力的影響、以及兩個(gè)參數(shù)的耦合作用,并由此找到了提高錨板承載力的應(yīng)用條件和優(yōu)化設(shè)計(jì)方向。論文第一部分為板形重力安裝錨在黏土中的旋轉(zhuǎn)調(diào)節(jié)過(guò)程研究。由于板形重力安裝錨結(jié)構(gòu)形式復(fù)雜,目前對(duì)板形重力安裝錨的研究都是基于實(shí)驗(yàn)的。大多為貫入深度測(cè)試,其它的為拔出模型試驗(yàn)。關(guān)于錨板在黏土中的承載力特性及旋轉(zhuǎn)調(diào)節(jié)過(guò)程的數(shù)值分析成果還未見到發(fā)表。為了探明板形重力安裝錨受到上拔力下潛的規(guī)律和內(nèi)在機(jī)理,通過(guò)小變形有限元分析結(jié)合最小二乘擬合建立了塑性模型。用塑性分析方法對(duì)錨板的旋轉(zhuǎn)調(diào)節(jié)過(guò)程進(jìn)行了研究,結(jié)果與大變形分析進(jìn)行了比較,吻合很好。然后采用塑性分析方法研究了荷載傾角、錨眼偏移量以及土體強(qiáng)度特性等參數(shù)對(duì)承載力和埋深損失的影響規(guī)律。結(jié)果表明當(dāng)加載角和錨眼偏移量設(shè)置恰當(dāng)時(shí),重力錨旋轉(zhuǎn)調(diào)節(jié)之后會(huì)下潛并提高抗拔承載力。論文第二部分研究了吸力式安裝平板錨在黏土中的旋轉(zhuǎn)調(diào)節(jié)過(guò)程。吸力式安裝平板錨有一個(gè)可繞錨爪旋轉(zhuǎn)的翼板。翼板的實(shí)際工作性能有很多學(xué)者進(jìn)行過(guò)研究。但由于吸力式安裝平板錨幾何形狀復(fù)雜,這些研究對(duì)其均有較大程度的簡(jiǎn)化,這些過(guò)多的簡(jiǎn)化對(duì)研究結(jié)果可能會(huì)造成很大的誤差。本文充分考慮了吸力式安裝平板錨的實(shí)際結(jié)構(gòu)型式和工作條件,對(duì)其在黏土中的旋轉(zhuǎn)調(diào)節(jié)過(guò)程進(jìn)行了比較貼近實(shí)際的數(shù)值模擬,并對(duì)翼板的實(shí)際作用進(jìn)行了分析。最后采用參數(shù)化方法研究了吸力式安裝平板錨的下潛潛能,并在此基礎(chǔ)上提出了對(duì)錨板進(jìn)行優(yōu)化設(shè)計(jì)的方法。
[Abstract]:With the development of Petroleum / natural gas to the deep sea, the offshore oil and gas mining platform faces an increasingly harsh working environment. The failure of the oil production platform will cause huge economic losses and serious casualties. As an important part of the deep-sea oil and gas mining platform, the anchorage system plays a key role in the safe operation of the guarantee platform. Deep development waters have put forward new requirements for anchoring system. The anchorage system is gradually developed from the traditional gravity foundation to the catenary system composed of anchors and anchors. Because of the simple and safe installation, the plate gravity installation anchor and suction type installation plate anchor have been widely used in marine engineering. But for this two, it has been widely used in the marine engineering. The performance of the plate anchors (anchors) used in deep sea clay has not been fully understood. The posture of the anchorage is different from that of the final bearing, and the anchor must pass through a rotation adjustment process to achieve the final bearing attitude. This adjustment process will lead to the loss of the anchor depth, thus reducing the bearing capacity of the anchor. The thrust bearing capacity is the main point of the design of the anchor plate, and it is also a hot and basic problem in the field of marine engineering research. Therefore, it is of great theoretical significance and application value to study the rotation regulation process of the anchor plate and its bearing capacity characteristics. In this paper, the plate type gravity installation anchor (Gravity Installed Plate Anchor-GIPLA) and the suction type installation plate anchor (S Uction Embedded Plate Anchor-SEPLA) as an object, the plastic analysis method is used to study the rotation regulation and bearing capacity of the anchors in clay. The results are compared with the results of the three dimensional large deformation finite element analysis (Three-dimensional Large Deformation Finite Element-3D-LDFE) analysis method and the plastic analysis side is used. The influence of the uplift angle and the angle of the anchor eye offset on the buried depth and bearing capacity, and the coupling effect of the two parameters are studied, and the application conditions and the optimal design direction for improving the bearing capacity of the anchorage plate are found. The first part of the paper is the study on the rotary joint process of the plate shaped gravity installation anchor in the clay. It is complicated in form. At present, the research of plate gravity installation anchor is based on experiments. Most of them are penetration depth tests and other models are drawn out. The numerical analysis of the bearing capacity characteristics of the anchor plate in clay and the numerical analysis of the rotation regulation process have not yet been published. The plastic model is established by the finite element analysis of small deformation combined with the least square fitting. The rotational adjustment process of the anchor plate is studied by the plastic analysis method. The results are compared with the large deformation analysis. The plastic analysis method is used to study the load angle, the offset of the anchor eye and the strength of the soil. The effect of characteristics and other parameters on the bearing capacity and depth loss. The results show that when the loading angle and the anchor eye offset are set at the time, the gravity anchor rotation adjustment will descend and improve the uplift bearing capacity. The second part of the paper studies the rotation and joint process of the suction type plate anchorage in the clay. The actual working performance of the wing plates rotated around the anchorage has been studied by many scholars. But because of the complex geometry of the suction type plate anchors, these studies have greatly simplified them. These too many simplifications may cause great errors in the research results. The structure type and working condition are compared with the actual numerical simulation of the rotation regulation process in clay, and the actual function of the wing plate is analyzed. Finally, the potential of the suction type plate anchorage is studied by using the parameterization method. On this basis, a method for optimizing the design of the anchor plate is put forward.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P751
本文編號(hào)：2154945
[Abstract]:With the development of Petroleum / natural gas to the deep sea, the offshore oil and gas mining platform faces an increasingly harsh working environment. The failure of the oil production platform will cause huge economic losses and serious casualties. As an important part of the deep-sea oil and gas mining platform, the anchorage system plays a key role in the safe operation of the guarantee platform. Deep development waters have put forward new requirements for anchoring system. The anchorage system is gradually developed from the traditional gravity foundation to the catenary system composed of anchors and anchors. Because of the simple and safe installation, the plate gravity installation anchor and suction type installation plate anchor have been widely used in marine engineering. But for this two, it has been widely used in the marine engineering. The performance of the plate anchors (anchors) used in deep sea clay has not been fully understood. The posture of the anchorage is different from that of the final bearing, and the anchor must pass through a rotation adjustment process to achieve the final bearing attitude. This adjustment process will lead to the loss of the anchor depth, thus reducing the bearing capacity of the anchor. The thrust bearing capacity is the main point of the design of the anchor plate, and it is also a hot and basic problem in the field of marine engineering research. Therefore, it is of great theoretical significance and application value to study the rotation regulation process of the anchor plate and its bearing capacity characteristics. In this paper, the plate type gravity installation anchor (Gravity Installed Plate Anchor-GIPLA) and the suction type installation plate anchor (S Uction Embedded Plate Anchor-SEPLA) as an object, the plastic analysis method is used to study the rotation regulation and bearing capacity of the anchors in clay. The results are compared with the results of the three dimensional large deformation finite element analysis (Three-dimensional Large Deformation Finite Element-3D-LDFE) analysis method and the plastic analysis side is used. The influence of the uplift angle and the angle of the anchor eye offset on the buried depth and bearing capacity, and the coupling effect of the two parameters are studied, and the application conditions and the optimal design direction for improving the bearing capacity of the anchorage plate are found. The first part of the paper is the study on the rotary joint process of the plate shaped gravity installation anchor in the clay. It is complicated in form. At present, the research of plate gravity installation anchor is based on experiments. Most of them are penetration depth tests and other models are drawn out. The numerical analysis of the bearing capacity characteristics of the anchor plate in clay and the numerical analysis of the rotation regulation process have not yet been published. The plastic model is established by the finite element analysis of small deformation combined with the least square fitting. The rotational adjustment process of the anchor plate is studied by the plastic analysis method. The results are compared with the large deformation analysis. The plastic analysis method is used to study the load angle, the offset of the anchor eye and the strength of the soil. The effect of characteristics and other parameters on the bearing capacity and depth loss. The results show that when the loading angle and the anchor eye offset are set at the time, the gravity anchor rotation adjustment will descend and improve the uplift bearing capacity. The second part of the paper studies the rotation and joint process of the suction type plate anchorage in the clay. The actual working performance of the wing plates rotated around the anchorage has been studied by many scholars. But because of the complex geometry of the suction type plate anchors, these studies have greatly simplified them. These too many simplifications may cause great errors in the research results. The structure type and working condition are compared with the actual numerical simulation of the rotation regulation process in clay, and the actual function of the wing plate is analyzed. Finally, the potential of the suction type plate anchorage is studied by using the parameterization method. On this basis, a method for optimizing the design of the anchor plate is put forward.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P751
【參考文獻(xiàn)】
相關(guān)期刊論文 前1條
1 張其一;欒茂田;袁凡凡;金丹;;復(fù)合加載情況下非均勻地基上矩形基礎(chǔ)承載力研究[J];巖土工程學(xué)報(bào);2008年07期
，本文編號(hào)：2154945
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