| 深厚砂卵石层低温动水条件下咬合桩帷幕材料研发 |
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| 引用本文： | 彭巍,王海,王仲全,卜桂玲.深厚砂卵石层低温动水条件下咬合桩帷幕材料研发[J].煤田地质与勘探,2020,48(4):80-86. |
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| 作者姓名： | 彭巍 王海 王仲全 卜桂玲 |
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| 作者单位： | 国家能源集团大雁公司,内蒙古呼伦贝尔021122;中煤科工集团西安研究院有限公司,陕西西安710077;呼伦贝尔学院,内蒙古呼伦贝尔021122 |
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| 基金项目： | 天地科技股份有限公司创新创业资金专项项目;科技创新基金 |
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| 摘 要： | 某露天煤矿为减少矿坑疏排水量,拟通过施工截水帷幕以切断矿坑北侧河流补给通道。结合现场施工条件,在架空高压线等特殊施工区域采用钻孔咬合桩帷幕。施工区砂卵石层厚度达45 m,含水层渗透系数达100 m/d,水力梯度0.033,地下水温长期维持在5℃,为保证咬合桩在深厚砂卵石层和低温动水条件下快速成桩,研制出一种以粉煤灰为主、水泥和粉煤灰添加剂为辅的混合防渗材料,并开展该材料的凝结时间、结石率、流动度、抗渗性能等多项参数测试。结果表明:研发材料最优配比为水灰比0.7︰1.0、水泥掺量(质量占比)40%、粉煤灰掺量60%、粉煤灰激发剂掺量2%,在5℃低温环境下凝结时间102 h,结石率94.6%、流动度23 cm,3 d强度1.06 MPa、90 d强度11.65 MPa、渗透系数低至8.61×10–8 cm/s。通过取心验证,成桩质量符合要求,截水效果好,矿坑疏排水量显著减少。该材料具有低价环保、抗渗性好等优点,可在类似工程中推广应用。
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| 关 键 词： | 砂卵石层 低温 动水条件 咬合桩 材料性能 |
| 收稿时间： | 2020-04-07 |
Properties of the occluded pile curtain material under low temperature and dynamic water condition in deep and thick gravel layer |
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| PENG Wei,WANG Hai,WANG Zhongquan,Bu Guiling.Properties of the occluded pile curtain material under low temperature and dynamic water condition in deep and thick gravel layer[J].Coal Geology & Exploration,2020,48(4):80-86. |
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| Authors: | PENG Wei WANG Hai WANG Zhongquan Bu Guiling |
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| Institution: | (Dayan Company of China Energy Investment Corporation,Hulun Buir 021122,China;Xi’an Research Institute Co.Ltd.,China Coal Technology and Engineering Group Corp.,Xi’an 710077,China;Hulun Buir University,Hulun Buir 021122,China) |
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| Abstract: | In order to reduce the water drainage of the studied open-pit mine, a curtain wall is proposed to cut off the river supply on the north side. With full consideration of the realities of construction site, the occluded pile curtain method is applied in an areas with a high voltage line overhead. The gravel layer thickness of the construction area is 45 m and the permeability coefficient is up to 100 m/d, with 0.033 hydraulic gradient and 5℃ groundwater temperature maintained for a long time. In order to ensure fast pile formation in deep gravel layer and low temperature dynamic water condition, a mixed impermeable material with fly ash as the main and cement and fly ash additives as the auxiliary was developed. Then, tests were carried out on the setting time, setting rate, fluidity and impermeability of the material. The mixed materials with water cement ratio of 0.7︰1.0, cement content of 40%, fly ash content of 60% and fly ash activator content of 2% shows the best performance:setting time, 102 h; setting rate, 94.6%; fluidity, 23 cm; 3 d strength, 1.06 MPa; 90 d strength, 11.65 MPa; and the permeability coefficient was as low as 8.61×10-8 cm/s. By coring verification, the pile quality met the requirements and the water cut off effect was remarkable. The material can be used in similar projects given its anti-permeability, competitive price as well as environmental protection. |
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| Keywords: | sand and gravel low temperature under dynamic water condition occluded pile material performance |
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