【摘要】：云南地區(qū)的地質(zhì)構(gòu)造、地形地貌極其復(fù)雜,昆明長(zhǎng)水國(guó)際機(jī)場(chǎng)場(chǎng)址位于高原丘陵巖溶地貌區(qū),地勢(shì)起伏變化較大,場(chǎng)址涉及的工程地質(zhì)單元多,機(jī)場(chǎng)建設(shè)過(guò)程中產(chǎn)生了深挖高填。機(jī)場(chǎng)西側(cè)的團(tuán)山因取土開(kāi)挖形成的殘積紅土高邊坡的穩(wěn)定性直接影響到機(jī)場(chǎng)的二期工程—西次跑道的施工與運(yùn)行；團(tuán)山殘積紅土邊坡的穩(wěn)定性是西次跑道建設(shè)過(guò)程中必須研究并處治的問(wèn)題。本文以長(zhǎng)水國(guó)際機(jī)場(chǎng)西側(cè)的團(tuán)山殘積紅土邊坡為研究對(duì)象,在系統(tǒng)的野外地質(zhì)調(diào)查基礎(chǔ)上,采取土樣、進(jìn)行室內(nèi)試驗(yàn)分析,深入研究分析了邊坡的區(qū)域地質(zhì)條件及殘積紅土的力學(xué)特征,綜合研究了邊坡的穩(wěn)定性影響因素,并選取邊坡的典型剖面,運(yùn)用GeoStudio-Slope/W、QUAKE/W軟件和ANSYS軟件,對(duì)邊坡在天然工況、地震工況下的穩(wěn)定性進(jìn)行數(shù)值模擬分析,為邊坡的處治提供建議。通過(guò)以上的分析研究,本文主要得出了以下結(jié)論和認(rèn)識(shí)：(1)此邊坡屬于開(kāi)挖的臺(tái)階狀邊坡,邊坡土體是下古生界寒武系中統(tǒng)陡坡寺組的砂頁(yè)巖(∈2d)風(fēng)化的殘積紅土；影響此邊坡的穩(wěn)定因素包括邊坡體固有的幾何形態(tài)特征、自重應(yīng)力、紅土物理力學(xué)參數(shù)等；及可能誘發(fā)邊坡失穩(wěn)的外部因素：地震應(yīng)力、地下水位上升及后期暴雨沖刷滲入等。(2)GeoStudio-Slope/W軟件計(jì)算結(jié)果顯示,天然狀態(tài)下,邊坡的最小安全穩(wěn)定性系數(shù)為：Janbu法-1.518；邊坡處于穩(wěn)定狀態(tài)；結(jié)合QUAKE/W軟件分析邊坡在地震工況下的穩(wěn)定性系數(shù),最大安全系數(shù)為Bishop法—1.133,邊坡處于失穩(wěn)破壞的臨界狀態(tài)。Slope/W軟件在分析臺(tái)階狀邊坡時(shí)有著方便、快捷、準(zhǔn)確的優(yōu)點(diǎn),對(duì)臺(tái)階狀邊坡的穩(wěn)定性分析有著一定的借鑒意義。(3)基于有限元強(qiáng)度折減法原理的ANSYS軟件數(shù)值模擬結(jié)果表明,在自重應(yīng)力情況下,坡頂坡腳均無(wú)明顯變形,邊坡處于穩(wěn)定狀態(tài)；在抗剪強(qiáng)度折減的情況下(Fc≠Fφ),當(dāng)Fc=1.86,Fφ=1.42時(shí)；邊坡的失穩(wěn)破壞規(guī)律更加明顯,因此采用1.86作為邊坡的穩(wěn)定性安全系數(shù)。這種雙系數(shù)強(qiáng)度折減(FcFφ),才更適合超固結(jié)類殘積紅土邊坡。經(jīng)過(guò)對(duì)比研究分析,對(duì)于坡比為1：1.5的殘積紅土邊坡,以Fc=1.3 Fφ來(lái)進(jìn)行強(qiáng)度折減分析,會(huì)獲得更精確的穩(wěn)定性安全系數(shù),這一折減比例,對(duì)此類型邊坡的研究具有一定的參考價(jià)值。(4)當(dāng)前狀況下,邊坡是穩(wěn)定的,在發(fā)生破壞性地震的情況下,有可能發(fā)生滑移失穩(wěn),應(yīng)做好坡頂?shù)姆罎B防沖刷等防護(hù)措施,坡面建議采用土工格室加固,植灌草護(hù)坡等植被防護(hù)措施,坡腳修建截水溝等確保邊坡的穩(wěn)定及西次跑道長(zhǎng)期安全運(yùn)營(yíng)。
[Abstract]:The geological structure, topography and geomorphology of Yunnan area are very complicated. The site of Changshui International Airport in Kunming is located in the karst geomorphology area of plateau hilly area. The topography fluctuates greatly, and the site involves many engineering geological units. During the construction of the airport, deep excavation and high fill were produced. The stability of the high slope of residual red soil formed by excavation of the Tuanshan on the west side of the airport has a direct impact on the construction and operation of the second phase of the airport project-the West Runway. The stability of Tuanshan residual laterite slope is a problem that must be studied and dealt with during the construction of the west runway. Taking the Tuanshan residual laterite slope on the west side of Changshui International Airport as the research object, on the basis of systematic field geological investigation, the soil samples are taken for laboratory test and analysis. The regional geological conditions of the slope and the mechanical characteristics of the residual laterite are studied in depth, and the influencing factors of the slope stability are comprehensively studied. The typical sections of the slope are selected, and the natural working conditions of the slope are analyzed by using GeoStudio-Slope/W,QUAKE/W software and ANSYS software. The stability of the slope under seismic conditions is analyzed by numerical simulation, which provides some advice for the treatment of slope. Through the above analysis and research, the following conclusions and understandings are obtained: (1) the slope belongs to the bench slope excavated, and the soil mass of the slope is the residual laterite weathered from the sand shale (鈭，

本文編號(hào)：2252614