【摘要】：地基穩(wěn)定性問題是指在建筑物荷載作用下,地基土體能否保持穩(wěn)定。若地基穩(wěn)定性不能滿足要求,地基在構(gòu)筑物荷載作用下將產(chǎn)生局部或整體剪切破壞,這種破壞將影響構(gòu)筑物的安全與正常使用。特高壓長江大跨輸電塔基施工難度大、沉降變形控制嚴(yán),尤其對(duì)于河相特殊的地質(zhì)環(huán)境,沉降控制至關(guān)重要。因此對(duì)于特高壓大跨輸電塔塔基特別是地形復(fù)雜的長江岸邊輸電塔塔基施工影響的研究具有積極的意義。基于樁土變形協(xié)調(diào)思路,本文針對(duì)靈州到紹興±800kV特高壓直流輸電線路長江大跨塔基工程,在樁基礎(chǔ)施工已經(jīng)完成的前提下研究了特高壓大跨塔基樁土變形協(xié)調(diào)機(jī)制及樁基優(yōu)化,在分析論證了原有設(shè)計(jì)方案存在很大安全風(fēng)險(xiǎn)的前提下并提出了兩種加固優(yōu)化方案,研究成果表明:(1)原有設(shè)計(jì)基礎(chǔ)無法滿足約300t的施工荷載要求,施工可能導(dǎo)致鐵塔傾斜、沉降、失穩(wěn)破壞等風(fēng)險(xiǎn),很有必要對(duì)塔基進(jìn)行加固處理。(2)塔基樁土變形協(xié)調(diào)破壞主要表現(xiàn)為前期工況樁以貫入式切入土體,隨荷載增大逐步變更為淺部土體和基礎(chǔ)結(jié)構(gòu)受損,承臺(tái)整體下沉、褥墊層破壞及周邊土體隆起,塔基無法承受上部過載作用而局部失穩(wěn)破壞。(3)墊層加固與土體注漿聯(lián)合加固這兩種方案對(duì)塔基進(jìn)行加固處理能很好的改善塔基承載能力,滿足施工要求。(4)在上部豎向荷載作用下,樁、土及承臺(tái)共同作用,變形協(xié)調(diào)。(5)通過數(shù)值計(jì)算和現(xiàn)場監(jiān)測(cè)得出的結(jié)論對(duì)實(shí)際工程提出了一些建議。
[Abstract]:The problem of foundation stability refers to whether the foundation soil can maintain stability under the action of building load. If the stability of the foundation can not meet the requirements, the local or global shear failure will occur under the load of the structure, which will affect the safety and normal use of the structure. The construction of ultra-high pressure Yangtze River transmission tower is difficult and the settlement deformation is controlled strictly. Especially for the special geological environment of river facies, settlement control is very important. Therefore, it is of positive significance to study the influence of the construction of UHV long span transmission tower, especially on the complex topography along the Yangtze River. Based on the idea of pile-soil deformation coordination, aiming at the Yangtze River large-span tower foundation project from Lingzhou to Shaoxing 鹵800kV UHV direct current transmission line, this paper studies the pile soil deformation coordination mechanism and pile foundation optimization under the premise that pile foundation construction has been completed. Based on the analysis and demonstration of the great safety risk of the original design scheme, two reinforcement and optimization schemes are put forward. The results show that: (1) the original design foundation can not meet the construction load requirement of about 300t, and the construction may lead to the tilt of the iron tower. It is necessary to reinforce the tower foundation because of the risk of settlement and instability. (2) the deformation and coordinated failure of the pile-soil in the tower foundation is mainly manifested as the pile cutting into the soil in the early working condition, and gradually changing to the shallow soil and the foundation structure with the increase of the load. The whole sinking of the cap, the failure of the cushion and the uplift of the surrounding soil, The tower foundation can not withstand the action of the upper overload and local instability. (3) the combination of cushion reinforcement and soil grouting can improve the tower foundation bearing capacity. (4) under the action of vertical load in the upper part, the pile, soil and cap act together, and the deformation is coordinated. (5) some suggestions for practical engineering are put forward by the conclusion of numerical calculation and field monitoring.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM754

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