不同支护模式下黄土高边坡开挖变形离心模型试验研究

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摘要为研究不同支护模式下黄土高边坡的开挖变形特征和支护结构性状，以观音堂隧道进口明洞段黄土高边坡为实例，采用土工离心机，开展黄土高边坡在无支护、全断面土钉支护、上部土钉下部预加固桩复合支护模式下的离心模型试验，试验结果表明：(1) 桩–钉复合支护体系能够显著提高黄土高边坡的稳定性，坡体上部土钉的布设有效地调动了边坡更大范围内土体变形的调整，使得边坡土体的潜在滑移面向坡体内侧转移，将潜在滑移面的剪出口位置限制在预加固桩桩顶以下，而下部预加固桩的布设则有效地承担上部滑体的推力作用，保证坡体在开挖过程中的稳定性。(2) 全断面土钉支护在一定程度上起到了加固边坡土体的作用，但由于土钉支护范围有限，当潜在滑移面深度超出土钉加固范围后，边坡土体发生更大范围内的失稳现象，加剧坡体的破坏。(3) 对于黄土高边坡的加固，桩钉复合支护要优于全断面土钉支护。

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关键词 ：边坡工程, 黄土高边坡, 开挖, 土钉支护, 桩钉复合支护, 离心模型试验

Abstract：In order to study the behaviour of high loess slope excavated and supported with different reinforcement modes，a series of centrifuge tests were conducted to simulate the high loess slope at the entrance of Guanyintang tunnel，considering the excavations without the reinforcement，with the full-section soil nailing，and with the soil nailing at the upper part and the pre-installed stabilizing pile at the lower part(pile-soil nailing structure) respectively. The pile-soil nailing structure was found to improve greatly the stability of the high loess slope in the tests. The soil nails at the upper part mobilized effectively a much wider area of loess slope to deform. The inward migration of the potential sliding surface led the toe of potential sliding surface be lowered to the position below the top of the pre-installed stabilizing piles. As such，the pre- installed stabilizing piles at the lower part can effectively bear the thrust force exerted by soil slope and guarantee the stability of loess slope during excavation. The stability of the loess slope was improved to certain degrees in the case of the full-section soil-nailing. However，when potential sliding surface surpass the reinforcement region of the soil nailing，the soil slope collapses eventually. Therefore，the combined structure of pile-soil nailing is better than the full-section soil nailing for the reinforcement of high loess slope.

Key words： slope engineering high loess slope excavation soil nailing pile-soil nailing centrifuge model test

收稿日期: 2013-05-28

引用本文:

王玉峰1，程谦恭1，黄英儒1，2. 不同支护模式下黄土高边坡开挖变形离心模型试验研究[J]. 岩石力学与工程学报, 2014, 33(05): 1032-1046.
WANG Yufeng1，CHENG Qiangong1，HUANG Yingru2. CENTRIFUGE TESTS ON EXCAVATION OF HIGH LOESS SLOPE WITH DIFFERENT REINFORCEMENT MODES. , 2014, 33(05): 1032-1046.

链接本文:

http://www.rockmech.org/CN/Y2014/V33/I05/1032

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