本文關(guān)鍵詞：差異化組合布錨支護(hù)方式對邊坡穩(wěn)定性影響及其工程應(yīng)用　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 差異化組合布錨 FLAC~(3D) 邊坡穩(wěn)定性 滑動面 組合-群錨效應(yīng)

【摘要】：為尋求邊坡錨桿布設(shè)的優(yōu)化形式,擬采用差異化錨長組合方式進(jìn)行支護(hù)。首先探討在邊坡不同位置單獨(dú)布錨,得出其對邊坡整體穩(wěn)定性的貢獻(xiàn)存在顯著差異,由此引出并強(qiáng)調(diào)邊坡層位的作用。另外考慮到對錨桿長度進(jìn)行差異組合在經(jīng)濟(jì)上更為合理,由此將邊坡錨桿組布設(shè)成“長-中-短型”、“中-長-短型”、“短-長-中型”三種組合形式,通過分析安全系數(shù)差異、錨桿軸力比重和滑動面位置等變化情況,研究布置方式的變化對邊坡穩(wěn)定性的影響。然后采用坡頂超載這一特定布載形式來檢驗(yàn)各組合加固邊坡后的穩(wěn)定性。最終,將前述內(nèi)容所得結(jié)論應(yīng)用至一三維錨桿(索)框格梁加固邊坡的實(shí)例中。本文研究成果主要如下:1、在組合布錨情況下,存在整體最佳錨固角θopt與層位有效錨長Leff,安全系數(shù)差異與滑動面位置的主控因素均隨錨固角在各層位間不斷轉(zhuǎn)移,邊坡破壞模式隨錨固角增大由深層滑動突變?yōu)闇\層滑動;當(dāng)各層錨桿組采用單層布錨下的最佳錨固角進(jìn)行組合布設(shè)時,加固效果一般,存在“組合-群錨效應(yīng)”,此時對各層錨桿組按小角度岔開布設(shè)為宜。2、在坡頂超載作用下,“短-長-中型”組合仍是最優(yōu)組合形式。而其特殊性體現(xiàn)在超載施加于坡頂,與坡頂層布置錨桿類型(錨長)有關(guān):坡頂層布置的錨桿越長,安全系數(shù)在超載值較大時下降幅值越小;主控邊坡滑動面的層位(或錨桿組)的錨固角范圍出現(xiàn)變動。3、采用錨桿(索)框格梁組合支護(hù)三維邊坡的穩(wěn)定性明顯提高�？蚋窳簂iner單元能很好的反映預(yù)應(yīng)力的施加,整體破壞形式基本不會發(fā)生,次級滑動面消失。預(yù)應(yīng)力錨索具有反向錨固作用,充分發(fā)揮深部穩(wěn)定巖層的自穩(wěn)能力,在一定程度上達(dá)到抑制了坡面卸荷變形效果;開挖邊坡支護(hù)與否穩(wěn)定性差異大,支護(hù)邊坡的剪應(yīng)變增量比未支護(hù)時顯著降低,大大地減小了剪切破壞的可能。4、邊坡開挖與預(yù)應(yīng)力錨索框格梁加固,實(shí)質(zhì)上是一個應(yīng)力釋放-卸荷回彈、應(yīng)力補(bǔ)償?shù)倪^程。
[Abstract]:In order to find the optimal form of the slope anchor placement, the differential anchor length combination is used to support the slope. Firstly, the individual anchor placement in different positions of the slope is discussed, and its contribution to the overall stability of the slope is found to be significantly different. In addition, considering that the difference of bolt length is more reasonable in economy, the bolt group of slope is arranged as "long, medium-short" and "medium-long-short". By analyzing the difference of safety factor, axial force specific gravity of anchor rod and the position of sliding surface, the three combination forms of "short, long and medium" are analyzed. The influence of the change of layout on the slope stability is studied. Then the overloading on the top of the slope is adopted to test the stability of the slope after the combined reinforcement. The above conclusions are applied to an example of reinforcement of slope with three dimensional anchor bar (cable) frame lattice beam. The main research results of this paper are as follows: 1, in the case of combined anchor placement. There exists the overall optimum anchoring angle 胃 opt and the effective anchor length Leff. the difference of safety factor and the main controlling factors of the sliding surface position are all transferred with the anchoring angle among the layers. The failure mode of slope changes from deep sliding to shallow sliding with the increase of anchoring angle. When the best Anchorage angle under single-layer anchor is adopted for each layer of anchor group, the reinforcement effect is general and there is "combination-group anchor effect". At this time, it is appropriate for each layer of anchor group to be arranged at a small angle. Under the action of slope top overload, "short-long-medium" combination is still the optimal combination form, and its particularity is that overload is applied to the top of the slope. It is related to the type of anchor (length of anchor) arranged at the top of the slope: the longer the anchor is arranged in the top of the slope, the smaller the decreasing amplitude of the safety factor is when the overload value is larger; The Anchorage angle range of the slide surface of the main control slope (or Anchorage group) varies by 3. 3. The stability of three-dimensional slope supported by bolting (cable) frame girder combination is obviously improved. The liner element of frame lattice beam can reflect the application of prestressing force, and the whole failure form will not occur. The secondary sliding surface disappears. The prestressed anchor cable has the function of reverse anchoring, fully exerts the self-stability ability of the deep stable rock, and to a certain extent, it can restrain the unloading deformation of the slope surface. The stability of excavation slope is different, the increment of shear strain is significantly lower than that without support, the possibility of shear failure is greatly reduced, the slope excavation and reinforcement of prestressed cable frame girder. Essentially, it is a process of stress release-unloading rebound and stress compensation.
【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】：2017
【分類號】：TU476;TU753

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 Navid Bahrani;John Hadjigeorgiou;;Explicit reinforcement models for fully-grouted rebar rock bolts[J];Journal of Rock Mechanics and Geotechnical Engineering;2017年02期

2 Zuyu Chen;Zhen Wang;Hao Xi;Zeyan Yang;Lichun Zou;Zhong Zhou;Chuangbing Zhou;;Recent advances in high slope reinforcement in China:Case studies[J];Journal of Rock Mechanics and Geotechnical Engineering;2016年06期

3 劉佳龍;賀雷;馮自霞;王寶齊;;巖質(zhì)高挖方邊坡錨桿參數(shù)優(yōu)化設(shè)計研究[J];巖土力學(xué);2016年S2期

4 王鈺;;基于強(qiáng)度折減法的土質(zhì)邊坡安全系數(shù)計算[J];公路交通技術(shù);2016年03期

5 車瀚;劉坤;;考慮地下水位變化的軟巖邊坡錨桿支護(hù)設(shè)計優(yōu)化[J];礦冶工程;2016年02期

6 唐堯;;深圳“12.20”山體滑坡災(zāi)害成因及安全防范分析[J];國土資源情報;2016年01期

7 甘建軍;羅人沅;唐春;楊普濟(jì);胡盛明;;基于強(qiáng)度折減法的松散堆積體穩(wěn)定性三維數(shù)值分析[J];地下空間與工程學(xué)報;2015年S2期

8 岳鵬飛;;巖質(zhì)陡坡防護(hù)與綠化復(fù)合結(jié)構(gòu)研究[J];鐵道工程學(xué)報;2015年12期

9 趙興東;劉杰;徐繼濤;溫新亮;;基于正交試驗(yàn)設(shè)計的某地下儲油洞庫群支護(hù)優(yōu)化[J];東北大學(xué)學(xué)報(自然科學(xué)版);2015年10期

10 Guanghua Yang;Zhihui Zhong;Yucheng Zhang;Xudong Fu;;Optimal design of anchor cables for slope reinforcement based on stress and displacement fields[J];Journal of Rock Mechanics and Geotechnical Engineering;2015年04期

相關(guān)博士學(xué)位論文 前1條

1 張家明;植被發(fā)育斜坡非飽和帶土體大孔隙對降雨入滲影響研究[D];昆明理工大學(xué);2013年

相關(guān)碩士學(xué)位論文 前1條

1 張露月;峨眉山玄武巖腐巖的物理力學(xué)特性及其形成機(jī)制[D];昆明理工大學(xué);2014年

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