广甘高速公路甘川界穿越土地贫瘠的西南山区，设计桥隧比例高，隧道主要穿越地 层中存在大量的千枚岩弃料，开挖过程中势必产生大量千枚岩弃渣。在路堤填方段缺乏 合适的填料来源的情况下，有时候迫使工程必须用千枚岩弃料进行路堤填方，使用千枚 岩弃料可以降低工程造价、保护有限的土地资源，最大限度的减少对周围环境的破坏。 但是由于千枚岩强度低、易破碎、水稳定性差，是一种不良的路基填料，至于是否能够 满足路基填筑规范要求目前尚无统一定论与可靠的理论依据，这严重阻碍了进度计划与 工程建设的成本预算。所以说如何有效使用大量千枚岩弃料作为路堤填筑材料便成为广 甘高速施工建设遇到的主要问题之一。 本文借助大量室内实验着重研究千枚岩开挖弃料的颗粒级配与路用性能，确定千枚 岩弃料作为路堤填料的可行性。本报告的主要研究成果如下： 1．对千枚岩弃料进行矿物分析试验知：广甘高速沿线千枚岩绢云母含量较高，膨 胀性粘土矿物成分很少。对千枚岩弃料进行了抗压强度试验、耐耐崩解性试验、膨胀性 试验、直剪试验，从弃料的力学性、水理特性方面初步分析了千枚岩弃料用作路堤填料 的可行性。 2．通过对不同条件下千枚岩弃料进行表面振动、重型击实试验，运用数理统计统 计了弃料在外力作用下颗粒级配变化，详细研究了弃料在击实功、击实时间、颗粒尺寸、 水等因素影响下的颗粒破碎情况。 3．通过击实试验确定颗粒粗细比对千枚岩弃料最大干密度的影响得知；在粗细比 6:4 时获得最大干密度。对击实试件进行 CBR 试验、水稳定性试验、加载后浸水和浸水 后加载等试验分析了千枚岩弃料路用特性，试验表明：击实试件水稳定性差，湿化变形 显著。 4．千枚岩压实料湿陷变形显著，水对路堤填筑效果影响大，需要对路基进行防水 处理，并确定具体的防水处理方案。 关键词：千枚岩弃料；水稳定性；颗粒级配；耐崩解性；表面振动；防水处理II Abstract Guang-gan expressway Gan-Chuan circles across the barren mountains of Southwest China, designs the bridge subterranean proportion to be high, the tunnel will mainly pass through in the stratum to have the massive phyllites, in the excavation process will produce the massive phyllite spoil inevitably. In the embankment fill section where lack suitable sources of packing case, sometimes forcing engineering must use phyllite spoil for embankment filling, Using phyllite spoil can reduce project cost and protect the limited land resources and minimize damage to the surroundings. But because of the low strength of phyllite, easily broken, poor water stability, is a poor subgrade filling material, whether can meet the subgrade filling requirements at present there is no unified theory and reliability theory, which seriously hampered the schedule and construction cost of the project budget. So how to effectively use a lot of phyllite spoil as embankment filling material will become one of the main problems encountered in Guang Gan high-speed construction. This article with a large number of laboratory focused on excavation of phyllite spoil road performance of the particle size distribution and to determine feasibility of phyllite spoil as embankment filler. The paper's main research results are as follows: 1. Through Mineral analysis: phyllite along Guang-gan high speed the wide sericite content, swelling clay mineral composition rarely.. Slightly weathere spoil test of compressive strength, resistance, swelling test, direct shear test, reject the preliminary analysis of the mechanical properties, water properties . Preliminary analysis of weakly weathered phyllite feasibility spoil used as embankment filling material 2 Through the surface vibration, the heavy compaction test under the different condition. Using of mathematical statistics analyze the discarded material changes in particle size distribution under the action of external force, a detailed study of the particle spiol in impact compaction, compaction time, particle size, water and other factors under the condition of the broken. 3 Through compaction test to determine the thickness effect on maximum dry density of phyllite reject; When thickness is ratio 6:4 to obtain maximum dry density. By the compacted specimens in CBR test, disintegration test, loading after soaking and immersing after loading test of phyllite spoil analyze the based features, experiments show that the water stability is poor, wetting deformation significantly. 4. Phyllite compacted material collapsible deformation is significant, water effect on the embankment filling effect, the need for water treatment of subgrade, and determine the waterproof processing scheme. Key words: phyllite spoil，water stability，particle size distribution，resistance to disintegration, surface vibration, waterproof treatmentIII 目 录 第一章 绪论..............................................................................................................................1 1.1 本文的研究目的及意义...................................................................................................1 1.2 本文工程背景...................................................................................................................1 1.3 国内外研究现状和发展前景 ..........................................................................................3 1.4 本文研究内容及方法 ......................................................................................................4 第二章 千枚岩基本物理力学性质..........................................................................................6 2.1 千枚岩弃料的构成 ..........................................................................................................6 2.1.1 矿物成分与表观特征 ................................................................................................6 2.1.2 微观结构特征 ...........................................................................................................6 2.2 千枚岩部分物理性质 ......................................................................................................8 2.2.1 基本物理性质 ...........................................................................................................8 2.2.2 耐崩解特性 ...............................................................................................................8 2.2.3 膨胀特性 ................................................................................................................. 11 2.3 千枚岩部分力学指标 ....................................................................................................12 2.3.1 抗压强度 .................................................................................................................12 2.3.2 抗剪强度 .................................................................................................................15 2.4 本章小结 ........................................................................................................................18 第三章 千枚岩颗粒级配分析................................................................................................19 3.1 概述 ................................................................................................................................19 3.2 千枚岩在表面震动作用下颗粒级配变化.....................................................................19 3.2.1 实验仪器及技术参数 ..............................................................................................19 3.2.2 试样准备 .................................................................................................................20 3.2.3 实验步骤 .................................................................................................................20 3.2.4 数据统计并绘制级配曲线图 .................................................................................20 3.2.5 试验结果分析 .........................................................................................................27 3.3 千枚岩在重型击实作用下颗粒级配变化.....................................................................29 3.3.1 实验仪器及技术参数 ..............................................................................................29 3.3.2 实验步骤 .................................................................................................................29IV 3.3.3 数据整理并