本文選題：土流變 + 岸坡失穩(wěn)�。� 參考：《重慶交通大學(xué)》2017年碩士論文

【摘要】：近年來(lái),土體的流變特性越來(lái)越受到巖土工程界的重視,這使得考慮土體流變特性的斜坡破壞失穩(wěn)機(jī)理成為目前的研究熱點(diǎn)和重點(diǎn)。對(duì)于位于水庫(kù)或者沿河地區(qū)的斜坡來(lái)說(shuō),水位波動(dòng)是造成斜坡失穩(wěn)的最主要影響因素。本論文以自然狀態(tài)下的庫(kù)岸堆積體土坡為研究對(duì)象,致力于構(gòu)建能夠反映岸土坡失穩(wěn)機(jī)理的岸坡安全系數(shù)-庫(kù)水波動(dòng)-岸坡土流變強(qiáng)度聯(lián)動(dòng)協(xié)調(diào)機(jī)制,論文主要的研究工作及研究成果包括以下幾方面:(1)系統(tǒng)性地引入土流變學(xué)基本理論、對(duì)比土流變?cè)Ｐ吞攸c(diǎn)和組合原理、掌握流變參數(shù)的識(shí)別方法,分析得知西元正夫元件模型和Burgers元件模型在模擬斜坡土流變方面具有優(yōu)良性。(2)利用西元正夫元件模型,并結(jié)合滑坡的流變控制理論,論文在考慮了斜坡失穩(wěn)的強(qiáng)度準(zhǔn)則以外,建立了斜坡失穩(wěn)的位移準(zhǔn)則,并通過(guò)該準(zhǔn)則和利用模型,建立了斜坡安全系數(shù)與時(shí)間的函數(shù)關(guān)系式。論文采用了Patton準(zhǔn)則和西元正夫流變模型對(duì)斜坡滑帶土的流變參數(shù)進(jìn)行了識(shí)別。論文收集了三峽庫(kù)區(qū)某土質(zhì)斜坡流變參數(shù),建立了滑帶土抗剪強(qiáng)度和時(shí)間的關(guān)系曲線。(3)論文進(jìn)行了三峽庫(kù)區(qū)大型土質(zhì)滑坡滑帶土室內(nèi)剪切流變實(shí)驗(yàn),發(fā)現(xiàn)了不同荷載等級(jí)下滑帶土的流變特性規(guī)律和長(zhǎng)期強(qiáng)度規(guī)律。并根據(jù)試驗(yàn)數(shù)據(jù),利用Burgers流變模型進(jìn)行了流變參數(shù)的辨識(shí),得到了岸坡滑帶土的流變方程,論證了土流變與斜坡失穩(wěn)的關(guān)系,即在不同的載荷條件下,斜坡土體呈現(xiàn)不同流變強(qiáng)度,斜坡失穩(wěn)最易發(fā)生在土體加速流變階段。(4)為了在土流變-岸坡失穩(wěn)關(guān)系中充分考慮庫(kù)水的影響,論文對(duì)非飽和土力學(xué)相關(guān)公式進(jìn)行了計(jì)算和推導(dǎo),并通過(guò)濾紙實(shí)測(cè)方法建立了基質(zhì)吸力與土體含水率的關(guān)系曲線。該曲線表明:隨著斜坡非飽和土體隨含水量的增加,其基質(zhì)吸力值減小;土的基質(zhì)吸力減小,斜坡滑帶土的抗剪強(qiáng)度降低。(5)論文利用FLac3D有限差分?jǐn)?shù)值模擬軟件建立了岸坡的計(jì)算模型,求得了庫(kù)水波動(dòng)條件下的岸坡安全系數(shù)與庫(kù)水位的對(duì)應(yīng)關(guān)系。通過(guò)運(yùn)用斜坡演化的非線性動(dòng)力學(xué)模型,找到了岸坡土流變強(qiáng)度與庫(kù)水位值二者之間的對(duì)應(yīng)關(guān)系,并且建立了岸坡土流變強(qiáng)度的評(píng)判標(biāo)準(zhǔn)。成功構(gòu)建了能夠反映庫(kù)岸堆積體土坡失穩(wěn)機(jī)理的岸坡安全系數(shù)-庫(kù)水波動(dòng)-岸坡土流變強(qiáng)度三者的聯(lián)動(dòng)協(xié)調(diào)機(jī)制。該機(jī)制表明:庫(kù)水位急劇下降,岸坡土介質(zhì)流變強(qiáng)度增大,岸坡的安全性降低。(6)最后,論文通過(guò)工程實(shí)例分析,論證了文中所提出的岸坡安全系數(shù)-庫(kù)水波動(dòng)-岸坡土流變強(qiáng)度的聯(lián)動(dòng)協(xié)調(diào)機(jī)制的合理性。
[Abstract]:In recent years, the rheological properties of soil have been paid more and more attention by the geotechnical engineering community. This makes the failure mechanism of slope failure to consider the rheological properties of soil. The water level fluctuation is the most important factor for slope instability in the reservoir or the river area. The reservoir slope of the bank bank in the state is the research object, which is devoted to constructing the coordination mechanism of the bank slope safety factor - the reservoir water fluctuation - the rheological strength of the bank slope, which can reflect the failure mechanism of the bank slope. The main research work and the research results of the paper include the following aspects: (1) systematically introducing the basic theory of soil rheology and comparing the soil rheology element The characteristics and combination principle of the model and the identification method of the rheological parameters are mastered. It is found that the Nishimoto Masao element model and the Burgers element model have good characteristics in the simulation of slope soil rheology. (2) using the Nishimoto Masao element model and combining the rheological control theory of the landslide, the paper considers that the strength criterion of slope instability is considered. In this paper, the relationship between the slope safety coefficient and the time is established through this criterion and the use model. The paper uses the Patton criterion and the Nishimoto Masao rheology model to identify the rheological parameters of the slope slide soil. The paper has collected the rheological parameters of a soil slope in the Three Gorges Reservoir Area and established the resistance of the slide soil. The relation curve of shear strength and time. (3) the paper carried out the laboratory shear rheology experiment of the large soil landslide belt soil in the Three Gorges Reservoir area, found the law of rheological characteristics and long-term strength of the soil with different load grades. According to the test data, the rheological parameters were identified by the Burgers rheology model, and the slope sliding zone was obtained. The rheology equation of soil demonstrates the relationship between soil rheology and slope instability, that is, under different load conditions, the slope soil presents different rheological strength and slope instability occurs most easily in the soil accelerated rheological phase. (4) in order to fully consider the influence of reservoir water in the relationship of soil rheological and bank slope instability, the paper carries out the relevant formulas of unsaturated soil mechanics. The relation curve of matrix suction and soil moisture content is established by the method of filter paper measurement. The curve shows that with the increase of water content, the suction value of the unsaturated soil decreases with the increase of water content; the matrix suction of soil decreases and the shear strength of slope slide soil decreases. (5) the finite difference numerical simulation of FLac3D is used in the paper. The software has established the calculation model of the bank slope, and obtained the corresponding relationship between the bank slope safety coefficient and the reservoir water level under the condition of the reservoir water fluctuation. By using the nonlinear dynamic model of the slope evolution, the corresponding relationship between the rheological strength of the bank slope soil and the value of the reservoir water level is found, and the evaluation standard of the rheological strength of the bank slope soil is established. The linkage coordination mechanism which can reflect the slope safety factor of bank slope instability mechanism, which can reflect the slope stability of bank slope stability, has been constructed. The mechanism shows that the water level of the bank falls sharply, the rheological strength of the bank slope is increased and the safety of the bank slope is reduced. (6) finally, the paper has demonstrated the proposed method in the paper through an example of the project. The safety coefficient of bank slope - the fluctuation of reservoir water - the rationality of the coordination mechanism of rheological strength of bank slope soil.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TV223

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