【摘要】：隨著國(guó)家經(jīng)濟(jì)的迅速增長(zhǎng)，公共設(shè)施和基礎(chǔ)設(shè)施建設(shè)蓬勃興起，邊坡穩(wěn)定性分析及治理顯得越來(lái)越重要。邊坡穩(wěn)定性分析方法有很多，不同的分析方法得出不同的結(jié)果。在邊坡的治理中，采用抗滑樁治理是常用方法之一。但抗滑樁的縱向位置及樁間距的確定，目前還沒(méi)一個(gè)統(tǒng)一的計(jì)算方法。因此對(duì)邊坡穩(wěn)定性分析研究及抗滑樁位置的優(yōu)化布置具有重要意義。 邊坡穩(wěn)定性分析方法的研究，國(guó)內(nèi)外在這方面已取得不小成績(jī)。本文針對(duì)巖石土體邊坡的特性，采用預(yù)應(yīng)力錨索抗滑樁加固邊坡，通過(guò)比較分析強(qiáng)度折減有限元法和極限平衡法的優(yōu)缺點(diǎn)，表明強(qiáng)度折減有限元法分析邊坡穩(wěn)定性更合理。針對(duì)目前有關(guān)土拱效應(yīng)的研究，樁的間距至今還沒(méi)有統(tǒng)一的計(jì)算方法，本文在前人研究的基礎(chǔ)上，對(duì)抗滑樁位置的布置進(jìn)行了深入研究，主要研究成果如下： ①對(duì)強(qiáng)度折減有限元法和極限平衡法的優(yōu)缺點(diǎn)對(duì)比分析，結(jié)合重慶疏港大道自身的特點(diǎn)，選用強(qiáng)度折減有限元法分析邊坡穩(wěn)定性。 ②采用強(qiáng)度折減法，計(jì)算出了抗滑樁縱向最佳位置。通過(guò)對(duì)土體參數(shù)折減計(jì)算，得出邊坡臨界值（安全系數(shù)為1）時(shí)位移最大區(qū)域。在邊坡位移最大區(qū)域的中部、位移最大區(qū)域的底部以及坡腳設(shè)置相同的抗滑樁，經(jīng)比較分析，，得出在位移最大區(qū)域的底部打抗滑樁既經(jīng)濟(jì)，又安全，施工也方便，效果最好。 ③提出了樁間距與土拱效應(yīng)的關(guān)系，針對(duì)抗滑樁間距對(duì)土拱影響，提出抗樁間距計(jì)算模型。推導(dǎo)了抗滑樁間距計(jì)算公式，并分析了抗滑樁間距L，拱高h(yuǎn)，內(nèi)摩擦角，樁寬a、粘聚力c、樁后荷載q之間的相互關(guān)系。通過(guò)分析計(jì)算，在其它因素不變的情況下，樁間距L與a、c成正比例關(guān)系，與q成反比例。土拱效應(yīng)和樁間距的關(guān)系為：當(dāng)樁凈間距小于3倍樁寬或大于7倍樁寬時(shí)，土拱效應(yīng)不明顯，或者不存在土拱效應(yīng)；當(dāng)樁凈間距大于3倍樁寬且小于7倍樁寬時(shí)，土拱效應(yīng)明顯，且樁間距越大，土拱效應(yīng)越小。 ④利用自己推導(dǎo)的抗滑樁樁間距計(jì)算公式，最終確定抗滑樁位置。 ⑤利用本文確定方法開(kāi)展了重疏港大道公路邊坡穩(wěn)定性計(jì)算，并對(duì)比單排樁和雙排樁兩種設(shè)計(jì)方案，從安全、經(jīng)濟(jì)、施工便利等因素綜合分析比較，建議優(yōu)先選擇單排抗滑樁處理邊坡。
[Abstract]:With the rapid growth of national economy, public facilities and infrastructure construction flourish, slope stability analysis and management becomes more and more important. There are many methods for slope stability analysis. In slope treatment, anti-slide pile treatment is one of the common methods. However, there is no unified calculation method for determining the longitudinal position and spacing of anti-slide pile. Therefore, it is of great significance to analyze the slope stability and optimize the position of anti-slide pile. The research of slope stability analysis method has made great achievements at home and abroad. According to the characteristics of rock and soil slope, the prestressed anchor cable anti-slide pile is used to reinforce the slope. By comparing and analyzing the advantages and disadvantages of the strength reduction finite element method and the limit equilibrium method, it is shown that the strength reduction finite element method is more reasonable to analyze the slope stability. In view of the current research on soil arch effect, there is no uniform calculation method of pile spacing up to now. Based on the previous studies, this paper makes a deep study on the location of anti-slide piles. The main research results are as follows: 1 comparing and analyzing the advantages and disadvantages of the strength reduction finite element method and the limit equilibrium method, combining the characteristics of Chongqing Shugang Avenue, the strength reduction finite element method is selected to analyze the slope stability. 2 the optimum longitudinal position of anti-slide pile is calculated by strength reduction method. By calculating the soil parameters, the maximum displacement area is obtained when the slope critical value (safety factor is 1). In the middle of the maximum displacement region of the slope, the same anti-slide pile is set at the bottom of the maximum displacement area and at the foot of the slope. By comparison and analysis, it is concluded that the anti-slide pile at the bottom of the maximum displacement area is economical, safe, convenient for construction and the best in effect. (3) the relationship between pile spacing and soil arch effect is put forward, and the calculation model of anti-pile spacing is put forward in view of the influence of anti-slide pile spacing on soil arch. The formula for calculating the distance between anti-slide piles is derived, and the relations among the spacing of anti-slide piles L, the height of arch h, the angle of internal friction, the width of pile a, the cohesion c and the load Q behind the pile are analyzed. Through analysis and calculation, under the condition that other factors are not changed, the pile spacing L is proportional to AGC and inversely proportional to Q. The relationship between soil arch effect and pile spacing is as follows: when the net spacing of piles is less than 3 times of pile width or greater than 7 times of pile width, the soil arch effect is not obvious or there is no soil arch effect, and when the net spacing of piles is more than 3 times of pile width and less than 7 times of pile width, The soil arch effect is obvious, and the larger the pile spacing is, the smaller the soil arch effect is. Finally, the position of anti-slide pile is determined by the formula of pile spacing derived by ourselves. 5. The stability calculation of the highway slope is carried out by using the method determined in this paper, and compared with the two design schemes of single row pile and double row pile, comprehensive analysis and comparison are made from the factors of safety, economy, construction convenience and so on. It is suggested that single row anti-slide pile should be selected as a priority for slope treatment.
【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】：2014
【分類號(hào)】：U416.14

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