| 花岗岩类土质边坡工程特性及加固方法研究 |
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| 引用本文： | 熊自英, 黄少强, 胡厚田. 2014: 花岗岩类土质边坡工程特性及加固方法研究. 工程地质学报, 22(6): 1241-1249. DOI: 10.13544/j.cnki.jeg.2014.06.031 |
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| 作者姓名： | 熊自英 黄少强 胡厚田 |
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| 作者单位： | 1.西南交通大学地质工程系 成都 610031;;2.清远市公路管理局 清远 511500 |
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| 基金项目： | 国家自然科学基金项目(4077217450278081)资助． |
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| 摘 要： | 华南、华东南地区具有厚度可达上百米的花岗岩风化残积层。高等级公路、铁路的规模建设在该地区形成了大量的花岗岩类土质高边坡。深入认识该类边坡的工程特性并提出有效的针对性边坡加固方法,对该地区公路、铁路的安全建设和正常运营具有重要意义。为了更有效指导该类边坡的稳定性分析及边坡设计,本文深入调查分析了广东和广西境内4条高等级公路沿线的44处花岗岩类土质边坡特征及其稳定性,认为控制该类边坡稳定性的因素主要有:土体的均匀性、岩脉(墙)及花岗岩球状硬核的分布情况、坡体中保留的结构面是否对坡体稳定性起控制作用。继而依据这些因素把花岗岩类土质边坡划分为岩脉(墙)隔挡型边坡、网状结构型边坡、外倾结构型边坡、浮石型边坡4种类型。深入分析了每种类型边坡的坡体结构特征、稳定特性,针对性地提出了边坡稳定性分析中应重点考虑的因素。认为花岗岩类土质边坡的土质及坡体结构特征,造成了该类边坡开挖临时自稳性较好,但具有较强的开挖卸荷效应和较弱的抗冲刷能力。最后针对每种类型的花岗岩类土质边坡,提出了相应的设计方案建议。基于花岗岩类土质边坡良好的临时自稳性,认为可进行陡开挖强支护设计,同时强调逐级开挖逐级支护、加强坡面防冲刷、边坡护脚及压顶、边坡截排水等设计建议。
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| 关 键 词： | 花岗岩类土质边坡 类型划分 工程特性 加固方法 |
| 收稿时间： | 2013-10-18 |
| 修稿时间： | 2014-03-09 |
ENGINEERING SPECIALTY AND REINFORCEMENT METHOD FOR MAN-MADE SLOPES IN WEATHERED GRANITIC SOILS |
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| XIONG Ziying, HUANG Shaoqiang, HU Houtian. 2014: ENGINEERING SPECIALTY AND REINFORCEMENT METHOD FOR MAN-MADE SLOPES IN WEATHERED GRANITIC SOILS. JOURNAL OF ENGINEERING GEOLOGY, 22(6): 1241-1249. DOI: 10.13544/j.cnki.jeg.2014.06.031 |
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| Authors: | XIONG Ziying HUANG Shaoqiang HU Houtian |
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| Affiliation: | 1.Geological Engineering Department of Southwest Jiaotong University, Chengdu 610031;;2.Road Administration Bureau, Qingyuan 511500 |
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| Abstract: | Southern and East southern China have wide distribution of weathered granitic residual soils. Some have depths of more than 100m. Large numbers of railways and roads have induced many man-made slopes in weathered granitic soils in these areas. It is very important to better understand the engineering specialties of the slopes and then provide effective targeting reinforcement methods for the safe construction and normal operation of the railways and roads. This paper is based on the investigation of 44 weathered granitic soil slopes along four express ways in Guangdong and Guangxi provinces. This kind of slopes is classified as dyke separator slope, netlike structure slope, out-dip structure slope, and isolated boulder slope according to the specialty of the special medium, slope body structures, and the effects of discontinues in the slope body. And then the corresponding stability calculation methods and the influencing factors of slope stability are put forward. Three engineering specialties are brought out from the investigation and research. The temporary stability of dyke separator slope, netlike structure slope is good. Unloading during excavation can strongly affect the stability and other characters of the weathered granitic soil slope because of the existing of discontinues in slope bodies. Weathered granitic soil slope, especially the superficial layer, can be easily scoured. The cause of these specialties are brought forward and discussed. According to each style of the weathered granitic soil slopes, the reinforcement methods and some suggestions are advanced considering the specialties of this kind of slopes. According to the better temporary stability, steep excavation with strong reinforcement is suggested in this paper. Step-by-step excavation with local supporting, anti-erosion measures, foot protection and crest coping, and water drainage are emphasized. |
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| Keywords: | Weathered granite soil slope Type classification Engineering specialty Reinforcement method |
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