Determination of shear strength parameters and stability analysis of waste disposal area using laboratory large-scale shear testing and engineering geologic analogy method
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摘要:
目前工程实践中弃渣场抗剪强度参数主要采用工程地质类比法进行取值, 参数误差较大, 有必要采用多种方法对弃渣场抗剪强度参数进行综合取值研究。以某公路弃渣场为工程实例, 通过室内颗分试验确定弃渣场弃渣的颗粒级配, 在此基础上采用室内大型剪切试验及工程地质类比法综合确定该弃渣的抗剪强度参数, 并以此参数计算弃渣体的稳定性。计算结果表明, 弃渣体在天然工况条件下稳定性系数为1.369, 在暴雨工况条件下稳定性系数为1.083, 弃渣场在计算工况条件下处于基本稳定-稳定状态, 与现场巡查及监测结果基本一致。说明该弃渣抗剪强度参数取值比较合理准确, 可为公路弃渣场参数取值提供参考。
Abstract:The engineering geological classification method has been widely used for determining the shear strength parameters of waste disposal areas in engineering practice; however the calculation error is large.It is necessary to use various methods to comprehensively estiamte the shear strength parameters of the spoil field. Taking a road waste slag yard as an example, the particle size distribution of the slag in the waste disposal area is determined by laboratory particle grading testing, and on this basis, the shear strength of the waste slag is comprehensively determined by indoor large-scale shear testing and engineering geological analogy method parameters.The shear strength is used to perform the stability analysis of the slag body. The results show that the factor of safety of the slag body is 1.369 under natural working conditions and 1.083 under heavy rain conditions, respectively. Additionally, the monitoring results are consistent with the stability analysis, proving that the determination of the shear strength parameter of the slag is reasonable and accurate, and it can provide a reference for the parameter value of the highway waste disposal engineering.
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图 1 弃渣场主剖面示意图
Figure 1. Schematic diagram of the principal profile of the waste disposal area
图 10 天然工况下弃渣场稳定性计算结果
Figure 10. Calculation results of the waste disposal area under natural working conditions
图 11 暴雨工况下弃渣场稳定性计算结果
Figure 11. Calculation results of the waste disposal area under heavy rain working conditions
图 13 弃渣场地表监测点累积位移-时间曲线
Figure 13. Cumulative displacement-time curves of surface monitoring points in the waste disposal area
图 14 弃渣场深部位移监测点累积位移-时间曲线
Figure 14. Cumulative displacement-time curves of deep displacement monitoring points in the waste disposal area
表 1 颗分试验结果
Table 1. Test results of the particle grading testing
颗粒组成(筛分法) 孔径/mm 60 40 20 10 5 2 小于该孔径质量分数/% 79.2 70.3 48.8 35 23.5 11.6 
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表 2 类似弃渣体抗剪强度参数值
Table 2. Shear strength parameters of similar waste disposal areas
序号 弃渣场名称 c/kPa φ/(°) 天然 饱和 天然 饱和 1 安家岭露天矿内排土场 6.8 - 23.8 - 2 杭长客专白力坞隧道出口弃渣场 7 - 40 - 3 周家隧道出口弃渣场 8 4 35 32
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表 3 弃渣抗剪强度综合取值
Table 3. Shear strength comprehensive values of the waste disposal
序号 取值 c/kPa φ/(°) 天然 饱和 天然 饱和 1 室内剪切试验 - 3~5 - 28~29 2 工程地质类比 6.8~8 4 23.8~40 32 3 综合取值 7 3 32 28
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稳定状态 不稳定 欠稳定 基本稳定 稳定 稳定系数Fs Fs＜1.0 1.0≤Fs＜1.05 1.05≤Fs＜Ks Fs≥Ks 注：Fs为计算稳定性系数；Ks为安全系数
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表 5 弃渣场稳定性评价结果
Table 5. Stability analyses of the waste disposal area
计算工况 稳定性系数Fs 控制标准 稳定性状态 天然工况 1.369 1.30 稳定 暴雨工况 1.083 1.15 基本稳定
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