本文選題：公路邊坡　切入點：擾動失穩(wěn)　出處：《昆明理工大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟建設(shè)的發(fā)展,國家基礎(chǔ)建設(shè)的持續(xù)投入,公路交通建設(shè)已進入新的發(fā)展時期,并結(jié)合國家一帶一路戰(zhàn)略,以西南地區(qū)為樞紐的交通路網(wǎng)將逐步形成。在西南山區(qū)高等級公路的修建過程中,難以避免地面臨大量巖土邊坡穩(wěn)定性問題。原始邊坡受開挖擾動而失穩(wěn)的問題也成為公路建設(shè)過程中的技術(shù)難題,而解決邊坡失穩(wěn)問題,除了盡量減少對原始邊坡的擾動外,采取合理的加固措施,是保證公路正常施工與安全運營的有效方法。本文以起鳳山隧道進口左側(cè)邊坡為研究對象,運用FLAC3D軟件對邊坡在隧道開挖擾動狀態(tài)下的穩(wěn)定性進行分析,在此基礎(chǔ)上,運用模糊多屬性系統(tǒng)決策方法優(yōu)選出技術(shù)可靠、經(jīng)濟合理的應(yīng)急加固措施,以有效保障起鳳山隧道進口段結(jié)構(gòu)的穩(wěn)定性以及大麗鐵路的安全暢通,主要研究內(nèi)容如下:(1)因隧道明洞段施工清理坡腳浮土以及明洞仰拱開挖施工的擾動,引起臨近已支護完成的邊坡失穩(wěn)。在收集并整理邊坡所處的地質(zhì)環(huán)境資料基礎(chǔ)上,運用地質(zhì)雷達探測技術(shù),對邊坡的滑坡特征進行勘探,圈定了邊坡的滑動范圍,確定了邊坡的滑動深度。(2)結(jié)合現(xiàn)場實際,運用FLAC3D分析邊坡在不同施工階段的穩(wěn)定性狀態(tài),并繪制安全系數(shù)變化折線圖,全方位分析邊坡從原始狀態(tài)到開挖失穩(wěn)這一動態(tài)過程中的應(yīng)力、應(yīng)變、位移變化特征,總結(jié)邊坡產(chǎn)生滑動的主導(dǎo)因素,為邊坡應(yīng)急加固措施的選擇提供依據(jù)。(3)在原有設(shè)計加固措施基礎(chǔ)上,運用模糊多屬性系統(tǒng)決策方法優(yōu)選出技術(shù)可靠、經(jīng)濟合理的鋼花管注漿型抗滑擋墻+錨索框格梁的聯(lián)合應(yīng)急加固措施,并根據(jù)邊坡在正常和降雨情況下的安全系數(shù)以及受力、變形情況,綜合分析邊坡加固完成后的穩(wěn)定性,評價應(yīng)急加固方案的加固效果。(4)應(yīng)急加固措施施工完成后,在邊坡坡面上布置沉降觀測點,對加固后的邊坡進行適時地觀測,并將實測數(shù)據(jù)與模擬評價結(jié)果進行對比,判定邊坡是否趨于穩(wěn)定,驗證邊坡應(yīng)急加固方案優(yōu)選結(jié)果的正確性。觀測數(shù)據(jù)表明邊坡是穩(wěn)定的,方案是可行的。
[Abstract]:With the development of economic construction and the continuous investment of national infrastructure, highway traffic construction has entered a new development period, and combined with the strategy of national Belt and Road, the traffic network with southwest as the hub will be gradually formed.In the process of constructing high grade highway in southwest mountainous area, it is difficult to face a large number of rock and soil slope stability problems.The problem of original slope instability caused by excavation disturbance has also become a technical problem in the course of highway construction. In order to solve the problem of slope instability, besides reducing the disturbance to the original slope as far as possible, reasonable reinforcement measures should be taken.It is an effective method to ensure the normal construction and safe operation of highway.In this paper, the left side slope of the entrance of Fengshan Tunnel is taken as the research object, and the stability of the slope under the disturbance state of tunnel excavation is analyzed by using FLAC3D software. On this basis, the fuzzy multi-attribute system decision method is used to select the best and reliable technology.Economic and reasonable emergency reinforcement measures to effectively ensure the stability of the entrance section of Fengshan Tunnel and the safety and unblocked traffic of the Dalian Railway.The main research contents are as follows: (1) due to the disturbance caused by the excavation of the floating soil at the slope foot and the excavation of the inverted arch of the open tunnel section of the tunnel, the slope which is close to the already supported slope is unstable.On the basis of collecting and arranging the geological environment data of the slope, using the geological radar detection technology, the landslide characteristics of the slope are explored, the slip range of the slope is delineated, and the slip depth of the slope is determined.The stability state of slope in different construction stage is analyzed by FLAC3D, and the curve diagram of safety factor variation is drawn. The characteristics of stress, strain and displacement in the dynamic process of slope from original state to excavation instability are analyzed in all directions.Summing up the main factors of slope sliding, providing the basis for the selection of slope emergency reinforcement measures. On the basis of the original design and reinforcement measures, the fuzzy multi-attribute system decision method is used to optimize and select the reliable technology.The economical and reasonable emergency reinforcement measures of Anchorage cable frame lattice beam of steel pipe grouting type anti-slide retaining wall, and according to the safety factor, force and deformation of slope under normal and rainfall conditions, the stability of slope after reinforcement is analyzed synthetically.After the construction of the emergency reinforcement measures is completed, settlement observation points are arranged on the slope surface of the slope, and timely observation is made on the reinforced slope, and the measured data are compared with the results of the simulation evaluation.To determine whether the slope tends to be stable and to verify the correctness of the optimal selection of the slope emergency reinforcement scheme.The observed data show that the slope is stable and the scheme is feasible.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U457.3

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