本文選題：節(jié)理邊坡 + 力學(xué)特性�。� 參考：《重慶大學(xué)》2015年碩士論文

【摘要】：隨著基礎(chǔ)建設(shè)的不斷發(fā)展,邊坡工程日益增多,節(jié)理邊坡失穩(wěn)問題凸顯出來,錨桿加固技術(shù)作為最常用的邊坡支護(hù)手段廣泛應(yīng)用于工程中。但是由于地質(zhì)體本身性質(zhì)的復(fù)雜與多樣性,導(dǎo)致目前的錨桿支護(hù)機理理論還不夠完善,對工程的指導(dǎo)作用還存在一定不足,繼續(xù)開展錨桿加固邊坡方面的研究很有必要。本文抓住節(jié)理邊坡穩(wěn)定性及強度往往受控于節(jié)理弱面的性質(zhì)這一思想,對節(jié)理弱面進(jìn)行了研究,宏觀上分析了其性狀對節(jié)理邊坡破壞類型的影響,細(xì)觀上分析了節(jié)理弱面的力學(xué)特性,基于地質(zhì)體漸進(jìn)破壞原則建立了平直節(jié)理面漸進(jìn)破壞計算模型,更合理的描述節(jié)理的剪切特性;在節(jié)理漸進(jìn)破壞計算模型基礎(chǔ)上,考慮錨桿對節(jié)理弱面的加固作用,推導(dǎo)了加錨節(jié)理面抗剪強度表達(dá)式,其反映出錨桿抗剪支護(hù)理論適合描述錨桿對節(jié)理邊坡的支護(hù)作用,即可以將錨桿對節(jié)理邊坡的加固作用等效為節(jié)理“粘聚力”的增大;將此結(jié)論應(yīng)用于節(jié)理邊坡錨固平面滑動穩(wěn)定性分析中,可得考慮錨桿受拉剪作用的邊坡穩(wěn)定性系數(shù)計算公式,可以從穩(wěn)定性系數(shù)上定量反映錨桿加固效應(yīng)。采用ANSYS對無支護(hù)和加錨支護(hù)的節(jié)理巖質(zhì)邊坡進(jìn)行數(shù)值模擬,通過位移、應(yīng)力以及穩(wěn)定性系數(shù)的對比,反映了錨桿加固效應(yīng),并驗證了穩(wěn)定性計算公式的可行性和適用性;結(jié)合工程實例,采用兩種考慮方式對錨桿進(jìn)行設(shè)計,通過對比可知當(dāng)采用全粘結(jié)錨桿支護(hù)節(jié)理邊坡時,考慮錨桿軸橫向作用的設(shè)計不僅更為合理,還可能達(dá)到節(jié)約鋼材的目的。
[Abstract]:With the development of basic construction, slope engineering is increasing day by day, and the problem of joint slope instability is prominent. As the most commonly used means of slope support, bolt reinforcement technology is widely used in engineering.However, due to the complexity and diversity of the geological body itself, the current theory of bolt support mechanism is not perfect enough, and the guiding role of the project is still insufficient. It is necessary to continue the research on bolting reinforcement of slope.Based on the idea that the stability and strength of joint slope are often controlled by the properties of joint weak plane, this paper studies the joint weak plane, and analyzes the influence of its characteristics on the failure type of joint slope.Based on the principle of progressive failure of geological bodies, a computational model of progressive failure of plane joints is established, which can more reasonably describe the shear characteristics of joints, and on the basis of the calculation model of progressive failure of joints,Considering the reinforcement effect of bolt on weak plane of joint, the expression of shear strength of bolted joint surface is deduced, which reflects that the theory of bolt shear support is suitable to describe the supporting effect of bolt on jointed slope.That is to say, the reinforcement effect of anchor rod on jointed slope can be equivalent to the increase of cohesive force of joint, and the conclusion can be applied to the analysis of plane sliding stability of joint slope Anchorage plane.A formula for calculating the stability coefficient of the slope considering the tension and shear action of the anchor rod can be obtained, and the reinforcement effect of the anchor rod can be quantitatively reflected from the stability coefficient.The ANSYS is used to simulate the jointed rock slope without support and bolting. Through the comparison of displacement, stress and stability coefficient, the reinforcement effect of bolt is reflected, and the feasibility and applicability of stability calculation formula are verified.Combined with engineering examples, the design of anchor rod is carried out by two ways of consideration. Through comparison, it can be seen that when fully bonded anchor rod is used to support jointed slope, the design of considering transverse action of anchor shaft is not only more reasonable, but also may achieve the purpose of saving steel.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TU43

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