本文關(guān)鍵詞：麗寧公路新團(tuán)滑坡穩(wěn)定性評價　出處：《昆明理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 滑坡 穩(wěn)定性 極限平衡法 數(shù)值模擬 flac3D 新團(tuán)

【摘要】：隨著社會的發(fā)展,公路交通顯得尤為重要。公路作為一種帶狀構(gòu)造物,尤其在我國西南多山地區(qū),難以避免的穿越斜坡地帶,路塹的開挖極易導(dǎo)致斜坡失穩(wěn)形成滑坡�；虏『Σ粌H對公路工程的建設(shè)質(zhì)量、投資及后期的養(yǎng)護(hù)產(chǎn)生較大影響,而且對過往人員的生命財產(chǎn)安全造成威脅。本文以麗寧公路新團(tuán)滑坡為研究對象,在系統(tǒng)的野外調(diào)查的基礎(chǔ)上,深入分析該滑坡形成的地質(zhì)背景及其基本特征,采用極限平衡及flac3D數(shù)值模擬計算方法,對其穩(wěn)定性進(jìn)行評價,為滑坡治理及保護(hù)提供理論依據(jù)。 研究結(jié)果表明：新團(tuán)滑坡屬于巨型-覆蓋型土質(zhì)滑坡,滑坡體主要為含礫粉質(zhì)粘土夾碎塊石、角礫土夾碎塊石及部分紅黏土等第四紀(jì)坡積物,滑床為主要為強(qiáng)風(fēng)化灰白色白云質(zhì)灰?guī)r,滑動面(帶)為巖土體分界面。新團(tuán)滑坡的形成因素包括形成條件及誘發(fā)因素,其中形成條件主要為斜坡體固有的地質(zhì)特征：地層巖性、地質(zhì)構(gòu)造、自重應(yīng)力、巖土體力學(xué)參數(shù)及水文地質(zhì)條件等；誘發(fā)因素為自然因素及人為因素主要表現(xiàn)在路塹邊坡開挖及后期暴雨沖刷滲入等方面。 極限平衡計算結(jié)果顯示,天然狀態(tài)下三個斷面穩(wěn)定性系數(shù)分別為1.375、1.062、1.057,滑坡整體處于極限平衡狀態(tài)。暴雨狀態(tài)下,穩(wěn)定性系數(shù)分別為0.827、0.799、0.779,天然+地震條件下,穩(wěn)定性系數(shù)分別為0.807、0.792、0.773,穩(wěn)定性系數(shù)均小于1,滑坡處于不穩(wěn)定狀態(tài)。flac3D數(shù)值模擬結(jié)果顯示,在重力情況下,滑坡整體表現(xiàn)穩(wěn)定,大部分區(qū)域位移較小甚至無位移�；碌姆�(wěn)定性系數(shù)為1.19,基本穩(wěn)定。暴雨情況下,滑坡穩(wěn)定性系數(shù)計算結(jié)果為0.68。表明滑坡達(dá)到極其不穩(wěn)定狀態(tài)。對已有支護(hù)進(jìn)行穩(wěn)定性評價,得出暴雨狀態(tài)下穩(wěn)定系數(shù)K=0.851～0.8831.0,說明滑坡在暴雨工況下處于五級不穩(wěn)定狀態(tài)。 目前狀況下,滑坡具有再次滑動(持續(xù)暴雨情況下)的可能,需要及時加大抗滑支擋加固措施才能確保整個滑坡處治工程的穩(wěn)定及公路長期運(yùn)營安全。
[Abstract]:With the development of society, highway traffic is becoming more and more important. As a kind of belt structure, especially in the mountainous area of southwest China, it is difficult to avoid crossing the slope zone. The excavation of cutting is easy to cause slope instability to form landslide. Landslide disease not only has a great impact on the construction quality, investment and later maintenance of highway engineering. This paper takes Xintuan landslide of Lianning Highway as the research object and analyzes the geological background and basic characteristics of the landslide on the basis of systematic field investigation. The limit equilibrium and flac3D numerical simulation method are used to evaluate the stability of the landslide and to provide theoretical basis for landslide control and protection. The results show that the Xintuan landslide belongs to the mega-covered soil landslide, and the landslide is mainly composed of gravel-bearing silty clay clastic rock, breccia soil clastic rock and some red clay and other Quaternary slope deposits. The sliding bed is mainly weathered grayish-white dolomite, and the slip surface (belt) is the interface of rock and soil. The forming factors of Xintuan landslide include the forming conditions and inducing factors. The forming conditions are mainly the inherent geological characteristics of the slope body: stratigraphic lithology, geological structure, gravity stress, geotechnical physical parameters and hydrogeological conditions, etc. The induced factors are natural factors and human factors mainly in cutting slope excavation and late storm erosion infiltration and so on. The results of limit equilibrium calculation show that the stability coefficients of the three sections are 1.375U 1.062 and 1.057 respectively under natural condition, and the landslide is in the state of limit equilibrium and under the condition of torrential rain. The stability coefficients are 0.827 ~ 0.799U ~ (0.779) and 0.807 ~ 0.792n ~ (0.773) respectively under natural earthquake. The stability coefficient is less than 1, and the numerical simulation results show that the whole landslide is stable under gravity. The stability coefficient of landslide is 1.19, which is basically stable. The calculated result of landslide stability coefficient is 0.68, which indicates that landslide reaches extremely unstable state. The stability evaluation of existing support is carried out. The result shows that the coefficient of stability is 0.851g 0.8831.0, which indicates that the landslide is in a five-stage unstable state under the condition of heavy rain. At present, landslide has the possibility of sliding again (under the condition of continuous torrential rain), so it is necessary to increase the measures of anti-slide support and reinforcement in order to ensure the stability of the whole landslide treatment project and the long-term operation safety of the highway.
【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】：2014
【分類號】：U418.55

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