本文選題：凍融循環(huán)　切入點：巖石試驗　出處：《中國地質大學（北京）》2013年碩士論文　論文類型：學位論文

【摘要】：我國是世界上多年凍土分布面積最多的國家之一。隨著西部大開發(fā)和振興東北戰(zhàn)略的實施，對凍土的研究逐步深入，采用一般凍土力學方法去研究凍巖問題，已難滿足日益增長的工程需要。因此，將凍巖問題作為一門新的研究方向提出來是必要的。 凍巖的主要工程危害有巖質邊坡的凍融剝蝕、滑塌以至滑坡，隧道巖體的凍脹開裂、失穩(wěn)，路基及建筑地基由于凍融產生的巖石底板凍脹抬升和融化下沉，輸油氣管線圍巖的凍脹使得管道擠壓開裂，，液化天然氣儲存庫巖腔凍脹影響儲存罐的安全等。目前，研究者研究了凍結對寒區(qū)隧道的影響，也對凍脹力對渠道的破壞進行了研究，但對凍結對寒區(qū)巖質邊坡的影響的研究尚不多見。論文以“青藏鐵路沿線地質災害發(fā)育規(guī)律及致災機理研究”為背景，開展如下研究工作： （1）選取工程常見巖性巖石（砂巖、灰?guī)r、花崗巖），加工成標準試件，進行飽和狀態(tài)下凍融循環(huán)試驗，凍融溫度區(qū)間為-20℃～+20℃。觀察巖石破壞物理過程，測定試樣凍融循環(huán)下的尺寸、質量、超聲波波速；對不同循環(huán)次數(shù)下的花崗巖進行單軸抗壓試驗。同時，取標準試件制作時保留的砂巖和灰?guī)r的巖屑，同步進行凍融試驗，每隔5次循環(huán)取出部分碎屑進行電鏡掃描試驗，研究凍融循環(huán)下巖石微觀結構變化特性。 （2）通過分析凍融循環(huán)試驗測定物理力學參數(shù)，分析凍融破壞形式、試件變形、波速變化規(guī)律；巖石不同凍融次數(shù)后的抗壓強度變化，分析巖石經過凍融后物理力學特性變化；分析0、5、10、15次凍融循環(huán)巖石碎屑電鏡掃描照片，分析巖石微觀損傷規(guī)律；總結巖石凍融損傷影響因素。 （3）以凍土理論為基礎，研究低溫巖體多場耦合等效分析方法。在研究的基礎上，建立邊坡等效模型，分析不同溫度邊界對邊坡的溫度場、位移、應力場的影響。
[Abstract]:China is one of the world's most populous country in Permafrost Distribution area. With the implementation of the western development and the revitalization of Northeast China strategy, the research on frozen soil is gradually thorough, the frozen soil mechanics method to study the problem of frozen rock, has been difficult to meet the growing needs of the project. Therefore, the problem of frozen rock as a new study the direction proposed is necessary.
The main works of frozen rock damage freeze-thaw erosion with rock slope, collapse and landslide, frost cracking, tunnel rock instability, roadbed and construction of foundation due to freeze-thaw of rock bottom frost uplift and thaw settlement, frost heave of oil and gas pipeline rock make the extrusion cracking of pipelines, liquefied natural gas storage in rock cavity heaving influence storage tank safety. At present, the researchers studied the effect of freezing on the tunnel in cold region, also made a study of frost heave force on the channel, but the effect of cold and freezing rock slope is still rare. Under the background of "the laws of development and disaster mechanism research" the geological disasters along the Qinghai Tibet railway, to carry out research work as follows:
(1) selection of engineering rocks (sandstone, limestone, granite), processed into standard test pieces of saturated freeze-thaw cycle test, freeze-thaw temperature range of -20 to +20 DEG C. To observe the damage of rock physical process, determination of freeze-thaw cycle size, quality of ultrasonic wave; uniaxial compressive tests of different cycles under granite. At the same time, the standard test pieces retained when making sandstone and limestone debris, synchronous freeze-thaw test every 5 cycles to remove part of debris SEM experiment research on freeze-thaw cycle of rock microstructure change characteristics.
(2) through the analysis of physical and mechanical parameters determination of freezing and thawing test, failure mode analysis of freezing and thawing, specimen deformation, velocity changes; compressive strength of rock after different freeze-thaw times, analysis of rock physical and mechanical properties change after freezing thawing; 0,5,10,15 analysis of freeze-thaw cycles of rock debris SEM photograph, analysis of rock the micro damage law; summarize rock freeze-thaw damage factors.
(3) based on frozen soil theory, the equivalent analysis method of multi field coupling for cryogenic rock mass is studied. Based on the research, an equivalent model of slope is established, and the influence of different temperature boundary on temperature field, displacement and stress field of slope is analyzed.

【學位授予單位】：中國地質大學（北京）
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TU45

【參考文獻】

相關期刊論文 前10條

1 李萍,徐學祖,陳峰峰;凍結緣和凍脹模型的研究現(xiàn)狀與進展[J];冰川凍土;2000年01期

2 仇文革;孫兵;;寒區(qū)破碎巖體隧道凍脹力室內對比試驗研究[J];冰川凍土;2010年03期

3 王家澄,張學珍,王玉杰;掃描電子顯微鏡在凍土研究中的應用[J];冰川凍土;1996年02期

4 楊平,李強,郁楚侯;人工凍土聲波參數(shù)試驗研究[J];冰川凍土;1997年02期

5 朱立平,Ｗ．Ｂ．Ｗｈａｌｌｅｙ,王家澄;寒凍條件下花崗巖小塊體的風化模擬實驗及其分析[J];冰川凍土;1997年04期

6 朱志武;寧建國;馬巍;;土體凍融過程中水、熱、力三場耦合本構問題及數(shù)值分析[J];工程力學;2007年05期

7 張玉軍;;模擬凍-融過程的熱-水-應力耦合模型及數(shù)值分析[J];固體力學學報;2009年04期

8 賴遠明,劉松玉,鄧學鈞,J.M.Konrad;寒區(qū)大壩溫度場和滲流場耦合問題的非線性數(shù)值模擬[J];水利學報;2001年08期

9 陳天城,魏炳乾;凍結融解作用對巖石邊坡穩(wěn)定的影響[J];西北水力發(fā)電;2003年03期

10 楊更社,蒲毅彬,馬巍;寒區(qū)凍融環(huán)境條件下巖石損傷擴展研究探討[J];實驗力學;2002年02期

本文編號：1629334