【摘要】：改擴建工程中，連續(xù)高邊坡路段開挖施工難度大、工期長，對道路運營影響大且需臨時封道。因此，本文依托杭州（紅墾）至金華高速公路改擴建項目，結(jié)合現(xiàn)場調(diào)查資料、理論分析和理正巖土軟件計算等方法，對擴建過程中連續(xù)高邊坡路段的邊坡穩(wěn)定性和拓寬方式展開研究，主要研究成果如下： （1）對杭州（紅墾）至金華高速公路沿線邊坡的區(qū)域環(huán)境進行了調(diào)查分析，初步掌握了老路邊坡的分布情況及其穩(wěn)定性，分析了邊坡的變形破壞機理。 （2）結(jié)合調(diào)查資料和理正巖土軟件，計算分析了不同因素影響下邊坡的穩(wěn)定性變化規(guī)律，結(jié)果表明，邊坡安全系數(shù)隨著巖體中裂隙水的水位上升而減�。粏渭夐_挖深度對邊坡安全系數(shù)的影響不及坡率的大；巖層傾角與邊坡穩(wěn)定性之間并不是簡單的遞增或遞減關(guān)系。 （3）對K92~K96路段的一處五級高邊坡擴建過程中的穩(wěn)定性進行分析，，并分析錨桿設(shè)計對邊坡穩(wěn)定的影響，從而優(yōu)化加固方案，結(jié)果表明，當采用自上而下的開挖方式時，對第四級邊坡開挖后，邊坡安全系數(shù)較上一級有所增加；隨后安全系數(shù)隨著開挖與支護工序的變化而上下波動，但由于施工擾動的影響，整體呈下降趨勢；越靠近坡腳的邊坡開挖對邊坡整體穩(wěn)定性影響越大；隨著錨桿長度的增加，邊坡安全系數(shù)的增幅慢慢減小；安全系數(shù)隨著錨桿錨固角的增大而增大，當增大到一定程度后，安全系數(shù)反而減小；上短下長的錨桿布置方案更有利于邊坡整體穩(wěn)定性。 （4）遵循改擴建的基本原則，并結(jié)合邊坡穩(wěn)定性評價結(jié)果，對K92~K96連續(xù)高邊坡路段的兩種不同拓寬方案進行比較分析，最終認為單側(cè)拼寬方案更經(jīng)濟合理。
[Abstract]:In the reconstruction and expansion project, the excavation construction of the continuous high slope section is difficult and the construction period is long, which has a great influence on the road operation and requires temporary closure of the road. Therefore, this paper relies on Hangzhou (Red Reclamation) to Jinhua Expressway reconstruction and expansion project, combined with field investigation data, theoretical analysis and straightening geotechnical software calculation methods, etc. The main research results are as follows: (1) the regional environment of slope along Hangzhou (Hongken)-Jinhua Expressway is investigated and analyzed. The distribution and stability of the old road slope are preliminarily grasped, and the deformation and failure mechanism of the slope is analyzed. (2) based on the investigation data and the software of straightening rock and soil, the stability of the lower slope is calculated and analyzed. The results show that the safety factor of the slope decreases with the water level of the fissure water in the rock mass rising; The influence of single-stage excavation depth on slope safety factor is not as large as that of slope rate, and the relationship between rock slope inclination and slope stability is not a simple increasing or decreasing relationship. (3) the stability of a fifth-grade high slope in K92~K96 section is analyzed, and the influence of bolt design on slope stability is analyzed, so as to optimize the reinforcement scheme. The results show that when the top-down excavation method is adopted, After excavation of the fourth grade slope, the safety factor of the slope is higher than that of the upper grade. Then the safety factor fluctuates with the change of excavation and support process, but because of the influence of construction disturbance, the overall trend decreases, and the slope excavation closer to the foot of the slope has a greater impact on the overall stability of the slope. With the increase of bolt length, the increase of slope safety factor decreases slowly, and the safety factor increases with the increase of anchor angle, but decreases when the anchor angle increases to a certain extent. The layout scheme of the upper and lower length bolt is more favorable to the overall stability of the slope. (4) following the basic principle of reconstruction and expansion, and combining with the evaluation results of slope stability, this paper makes a comparative analysis of two different widening schemes of K92~K96 continuous high slope section, and finally considers that the one-sided widening scheme is more economical and reasonable.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U416.1

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