【摘要】：隨著國(guó)家對(duì)西南地區(qū)鐵路建設(shè)的大力支持,貴州響應(yīng)國(guó)家號(hào)召,規(guī)劃和建設(shè)了許多條意義深遠(yuǎn)的鐵路線。林織鐵路作為貴州鐵路建設(shè)中一條重要的線路,其順利的建設(shè)和運(yùn)營(yíng)對(duì)貴州的經(jīng)濟(jì)和產(chǎn)業(yè)結(jié)構(gòu)意義重大。林織鐵路全長(zhǎng)99.559km,沿線穿越多個(gè)構(gòu)造單元,地質(zhì)條件復(fù)雜,線路橋梁隧道十分常見(jiàn)。其中納界河特大橋岸坡陡峭,巖性復(fù)雜,巖體被多組節(jié)理切割,巖體破碎,是整個(gè)線路建設(shè)的難點(diǎn)。能夠順利完成納界河特大橋?qū)α挚椌�整個(gè)線路意義重大。本論文的研究目的：對(duì)納界河特大橋橋址岸坡巖體的結(jié)構(gòu)面強(qiáng)度評(píng)價(jià)；運(yùn)用經(jīng)驗(yàn)公式確定岸坡穩(wěn)定坡腳；運(yùn)用離散元軟件確定岸坡巖體的破壞模式；運(yùn)用有限元軟件確定岸坡穩(wěn)定性。本論文的主要研究?jī)?nèi)容和研究成果：(1)通過(guò)對(duì)現(xiàn)場(chǎng)左右兩側(cè)岸坡的地質(zhì)情況進(jìn)行調(diào)查,對(duì)現(xiàn)場(chǎng)地質(zhì)情況有了比較充分的了解,測(cè)得了多組結(jié)構(gòu)面的產(chǎn)狀、張開(kāi)度以及節(jié)理間距等控制巖體質(zhì)量的因素。(2)通過(guò)巴頓模型求得了結(jié)構(gòu)面的強(qiáng)度,運(yùn)用赤平投影法對(duì)左右兩岸單一以及楔形結(jié)構(gòu)面穩(wěn)定性進(jìn)行分析。得到坡面錯(cuò)落崩塌將是兩岸邊坡破壞的主要形式的結(jié)果。(3)通過(guò)經(jīng)驗(yàn)公式算得納界河特大橋左岸天然穩(wěn)定坡角為65°；右岸天然穩(wěn)定坡角59°。,對(duì)荷載作用下邊坡的穩(wěn)定有一定借鑒意義。(4)通過(guò)離散單元法對(duì)岸坡變形破壞模式進(jìn)行分析發(fā)現(xiàn),自然無(wú)外力擾動(dòng)條件下,兩側(cè)岸坡處于緩慢發(fā)展階段,坡面整體比較平穩(wěn),只是在變坡點(diǎn)等局部部位相對(duì)比較危險(xiǎn),存在一定崩塌可能。橋梁施加荷載主要影響基座上部巖體穩(wěn)定性,對(duì)基座附近巖體的穩(wěn)定性不會(huì)產(chǎn)生太大影響。(5)通過(guò)有限單元法對(duì)橋梁兩岸岸坡安全系數(shù)進(jìn)行計(jì)算,天然狀態(tài)和加橋梁荷載作用下,左右兩岸岸坡穩(wěn)定性系數(shù)分別為1.60、1.90,1.30、1.40。因此兩岸岸坡在兩種工況下都基本穩(wěn)定。(6)因左岸陡壁處巖體風(fēng)化強(qiáng)烈,節(jié)理裂隙發(fā)育,且發(fā)現(xiàn)已有錯(cuò)落體,建議對(duì)風(fēng)化巖體進(jìn)行錨固。兩岸邊坡底部均發(fā)育節(jié)理裂隙及層理,建議對(duì)底部節(jié)理裂隙進(jìn)行噴漿加固處理。納界河兩岸邊坡均為灰?guī)r及白云質(zhì)灰?guī)r,底部因靠近河水而發(fā)生溶蝕并形成孔洞及臨空面,建議采取溶洞灌漿、坡體表面排水等處理措施。
[Abstract]:With the great support of the state to the railway construction in southwest China, Guizhou has planned and built many railway lines of far-reaching significance in response to the call of the state. As an important railway line in Guizhou railway construction, the smooth construction and operation of forestry railway is of great significance to the economic and industrial structure of Guizhou. LinzhouRailway is 99.559 km in length and passes through many structural units. The geological conditions are complicated and the route and bridge tunnels are very common. The steep bank slope, complex lithology, rock mass cut by multiple joints and broken rock mass are the difficulties of the whole line construction. It is of great significance for the whole line of forest weaving to be able to successfully complete the Najie River Bridge. The purpose of this paper is to evaluate the structural plane strength of the slope rock mass at the site of the Najiehe Bridge, to determine the stable slope foot by empirical formula, to determine the failure mode of the slope rock mass by using discrete element software. The stability of bank slope is determined by finite element software. The main research contents and results of this paper are as follows: (1) through the investigation of the geological conditions on the left and right sides of the site, the geological conditions in the field are fully understood, and the occurrence of many groups of structural surfaces is measured. (2) the strength of the structural plane is obtained by using the Barton model, and the stability of the single and wedge-shaped structural plane is analyzed by using the plain projection method. The results of slope collapse will be the main form of slope failure on both sides of the bank. (3) the natural stable slope angle of the left bank of Nanjie River Bridge is 65 擄by empirical formula; The natural stable slope angle on the right bank is 59 擄, which is useful for the stability of the slope under load. (4) through the analysis of the deformation and failure mode of bank slope by discrete element method, it is found that, under the condition of natural disturbance without external force, The slope on both sides is in the stage of slow development, the whole slope is relatively stable, but it is relatively dangerous in some parts, such as the variable slope, and there is a possibility of collapse. The load exerted by the bridge mainly affects the stability of the rock mass in the upper part of the foundation, and will not have much effect on the stability of the rock mass near the foundation. (5) the safety factor of the bank slope on both sides of the bridge is calculated by the finite element method. Under natural condition and bridge load, the slope stability coefficient of left and right banks is 1.601.90 ~ 1.30g / 1.40 respectively. Therefore, the bank slope on both banks is basically stable under both conditions. (6) because of the strong weathering of the rock mass at the steep wall of the left bank and the development of joints and fissures, it is suggested that the weathered rock body be anchored. Joint fissures and bedding are developed at the bottom of both sides of slope. The slope on both banks of Najie River is limestone and dolomitic limestone, and the bottom of the slope is dissolved near the river and forms holes and voids. It is suggested to take some treatment measures such as cavity grouting, surface drainage of slope body and so on.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U443.84

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