本文關(guān)鍵詞：樹(shù)根樁在高挖邊坡防護(hù)中的穩(wěn)定性研究　出處：《長(zhǎng)安大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 高挖邊坡 邊坡穩(wěn)定性 樹(shù)根樁 設(shè)計(jì)參數(shù) 施工工藝

【摘要】：隨著高速公路建設(shè)進(jìn)程的不斷延伸，高速公路網(wǎng)絡(luò)的逐步形成，山區(qū)高速公路的修建也逐步普遍化。然而受到山區(qū)固有地形地質(zhì)、自然環(huán)境條件的制約，，山區(qū)高速公路地質(zhì)災(zāi)害發(fā)生頻繁并且類(lèi)型多種多樣。在山區(qū)修建高速公路存在諸多安全隱患，尤其是在高挖邊坡工程中。所以在山區(qū)修建高速公路時(shí)，需要特別注意高挖邊坡的穩(wěn)定性問(wèn)題。 本文以樂(lè)宜高速公路高挖邊坡為依托工程，分析了高挖邊坡的破壞形式及各類(lèi)地質(zhì)災(zāi)害的預(yù)報(bào)。利用FLAC3D建立數(shù)值模型，采用強(qiáng)度折減法，研究了樹(shù)根樁的樁位、樁長(zhǎng)、樁徑等設(shè)計(jì)參數(shù)對(duì)高挖邊坡穩(wěn)定性的影響。結(jié)果表明：一級(jí)坡體中設(shè)置在距坡腳的1/3附近坡面處，多級(jí)邊坡設(shè)置在離坡腳最近的平臺(tái)附近，此時(shí)邊坡的安全系數(shù)較高，且所需樹(shù)根樁樁長(zhǎng)較短、樁徑較�。粯�(shù)根樁的樁長(zhǎng)一定要穿過(guò)初始滑動(dòng)面，且樁長(zhǎng)大于臨界樁長(zhǎng)；對(duì)于不同的樁位，當(dāng)樁長(zhǎng)完全穿越新的滑動(dòng)面時(shí)，邊坡安全系數(shù)均大于1.8；越靠近坡腳的樹(shù)根樁，增加樁徑的效果越明顯，而靠近坡頂時(shí)，設(shè)置斜樹(shù)根樁更有利。 采用極限平衡法和有限元法，選取典型高挖邊坡，分析了框架梁防護(hù)和樹(shù)根樁防護(hù)在不同工況下的穩(wěn)定性并進(jìn)行對(duì)比。結(jié)果表明：樹(shù)根樁在高挖邊坡防護(hù)上具有一定的優(yōu)越性。
[Abstract]:With the continuous extension of highway construction process and the gradual formation of highway network, the construction of mountain highway is gradually generalized. However, it is restricted by the inherent terrain, geology and natural environment conditions. The geological disasters of highway in mountainous area occur frequently and are of various types. There are many hidden dangers in the construction of highway in mountain area, especially in the high excavation slope engineering. So, when building expressway in mountainous area. Special attention should be paid to the stability of high-excavated slopes. In this paper, based on the high excavation slope of Leyi Expressway, the failure form of high excavation slope and the prediction of various geological hazards are analyzed. The numerical model is established by FLAC3D and the strength reduction method is adopted. The influence of pile position, pile length, pile diameter and other design parameters on the stability of highly-excavated slope is studied. The results show that the first-grade slope body is located near the slope surface 1/3 from the foot of the slope. The multi-stage slope is located near the nearest platform at the foot of the slope, and the safety factor of the slope is high, and the length of the root pile is shorter and the diameter of the pile is smaller. The pile length of the tree root pile must pass through the initial sliding surface and the pile grows up to the critical pile length. For different pile positions, when the pile length passes through the new sliding surface completely, the slope safety factor is higher than 1.8; The more the root pile near the foot of the slope, the more obvious the effect of increasing the diameter of the pile is, but when near the top of the slope, it is more advantageous to set the inclined root pile. The limit equilibrium method and finite element method are used to select the typical high excavated slope. The stability of frame beam protection and root pile protection under different working conditions is analyzed and compared. The results show that the tree root pile has some advantages in high excavation slope protection.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U416.14;U417.1

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本文編號(hào)：1385848