| 引用本文: | 李梦天,张霄,李术才,张庆松,左金鑫,蓝雄东.基于数值模拟和模型实验的注浆抬升计算方法[J].哈尔滨工业大学学报,2019,51(8):159.DOI:10.11918/j.issn.0367-6234.201807209 |
| LI Mengtian,ZHANG Xiao,LI Shucai,ZHANG Qingsong,ZUO Jinxin,LAN Xiongdong.Grouting lifting numerical methods based on numerical simulation and model experiment[J].Journal of Harbin Institute of Technology,2019,51(8):159.DOI:10.11918/j.issn.0367-6234.201807209 |
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| 摘要: |
| 针对城市浅埋地下工程注浆施工造成的地表抬升问题,根据随机介质理论建立注浆抬升计算方法及简化算法,分别研究压密注浆与劈裂注浆对地表抬升的影响机制.通过PFC软件模拟、室内模型实验等方法,研究球体压密注浆和水平片状劈裂注浆对地表抬升范围的影响,验证地表抬升位移理论预测方法的准确性.通过引入注浆抬升系数γ研究注浆深度、土体干密度、土体含水率等因素对注浆抬升位移的影响.结果表明,注浆抬升计算方法的简化方法在注浆埋深大于2 m时较为准确,小于2 m时不适用；压密注浆和劈裂注浆两种注浆方式引起的地表抬升与数学模型计算结果、数值模拟结果吻合性较好；单孔注浆使上覆倒锥形土体位移场发生变化,压密注浆导致的地表最大抬升位移较大,劈裂注浆在地表的影响范围较大；注浆深度、土体干密度及土体含水率对最大注浆抬升位移量均有影响,注浆深度对抬升位移量的作用最明显. |
| 关键词: 注浆 地表抬升 数学模型 数值模拟 模型实验 |
| DOI：10.11918/j.issn.0367-6234.201807209 |
| 分类号:TV543 |
| 文献标识码:A |
| 基金项目:山东省自然科学基金(ZR201702230205) |
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| Grouting lifting numerical methods based on numerical simulation and model experiment |
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LI Mengtian1,ZHANG Xiao1,LI Shucai1,ZHANG Qingsong1,ZUO Jinxin2,LAN Xiongdong1
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(1.Geotechnical and Structural Engineering Research Center, Shandong University, Jinan 250061, China; 2.Shandong Institute of Architectural Design Co., Ltd., of China Railway First Design Institute Group, Qingdao 266031, Shandong, China)
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| Abstract: |
| To solve the problem of surface lifting caused by grouting in urban shallow underground projects, grouting lift calculation method and simplified algorithm were established based on the theory of stochastic medium, and effects of compaction grouting and fracture grouting on surface uplift were studied. Through PFC simulation and laboratory model experiments, the suffering area of the surface uplift by ball compaction grouting and horizontal fracture grouting were studied, and the accuracy of the grouting lift calculation method of surface uplift displacement was verified. Effects of grouting depth, soil dry density, and soil water content on surface uplift during grouting were investigated by introducing the grouting uplift coefficient γ. Results show that the simplified method of theoretical prediction of surface uplift displacement was accurate when the depth of grouting was greater than 2 m, and it was not applicable when the depth of grouting was less than 2 m. The surface uplift caused by the two grouting methods was consistent with the results of the numerical simulation and the mathematical model calculation. Single hole grouting changed the displacement field of the overlying inverted cone soil. The maximum surface displacement caused by compaction grouting was large, so was the influence range of fracture grouting on the surface. Factors such as grouting depth, soil dry density, and soil water content all influenced the maximum surface displacement caused by grouting, among which grouting depth was the most important factor. |
| Key words: grouting surface uplift mathematical model numerical simulation model experiment |
