| 全风化花岗岩地层中高固相离析浆液灌浆机理研究 |
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| 引用本文： | 赵钰,郑洪,曹函,林飞,王旭斌,贺茉莉.全风化花岗岩地层中高固相离析浆液灌浆机理研究[J].水文地质工程地质,2021,48(2):78-88. |
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| 作者姓名： | 赵钰 郑洪 曹函 林飞 王旭斌 贺茉莉 |
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| 作者单位： | 1.中南大学地球科学与信息物理学院，湖南 长沙 410083 |
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| 基金项目： | 国家自然科学基金项目(41302124);国土资源部复杂条件钻采技术重点实验室基金开放课题基金(EDLF2017)。 |
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| 摘 要： | 全风化花岗岩地层稳定性差、遇水易发生崩解，工程上使用常规材料防渗加固注浆时效果较差。针对这一情况，依托湖南省郴州市莽山水库防渗加固灌浆项目，通过自主设计的全风化花岗岩地层注浆室内模拟试验装置，进行模拟注浆试验，实现了浆液在整个注浆过程中的扩散情况模拟，对不同注浆压力、不同位置点所取试样开展单轴抗压、抗剪强度及渗透率测试试验，对不同注浆压力下完整结石体取样观察，研究以全风化花岗岩颗粒为配方主体材料的高固相离析浆液在全风化花岗岩地层的防渗加固效果及浆液扩散模式。结果表明:该浆液在全风化花岗岩地层扩散过程中经历了渗透扩散、挤密压缩、劈裂扩展三个阶段，是一种复合注浆形式；以全风化花岗岩颗粒为主体的高固相离析浆液在全风化花岗岩地层注浆中效果显著，随着注浆压力提升，单轴抗压强度显著提升为原土体的3.25～13.67倍，抗剪强度在不同法向压力情况下提升为原土体的1.63～2.69倍，渗透系数从10?4 cm/s下降至10?5 cm/s甚至10?6 cm/s。
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| 关 键 词： | 全风化花岗岩 高固相离析浆液 注浆压力 注浆效果 浆液扩散模式 |
| 收稿时间： | 2020-06-11 |
A study of grouting mechanism of high solid phase segregation grout in fully weathered granite |
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| ZHAO Yu,ZHENG Hong,CAO Han,LIN Fei,WANG Xubin,HE Moli.A study of grouting mechanism of high solid phase segregation grout in fully weathered granite[J].Hydrogeology and Engineering Geology,2021,48(2):78-88. |
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| Authors: | ZHAO Yu ZHENG Hong CAO Han LIN Fei WANG Xubin HE Moli |
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| Institution: | 1.School of Geosciences and Information Physics, Central South University, Changsha, Hunan 410083, China2.Hunan Hydro&Power Design Institute, Changsha, Hunan 410000, China3.Hunan Hongyu Engineering Group Co. Ltd., Changsha, Hunan 410000, China |
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| Abstract: | The stability of completely weathered granite is poor and it is easy to disintegrate when exposed to water. In engineering, the grouting effect of using conventional materials for seepage prevention and reinforcement in this rock is poor. In view of this situation, based on the grouting project of the Mangshan reservoir in Chenzhou of Hunan Province, the simulated grouting experiment is carried out by the independent design of the laboratory simulation test device. The diffusion of slurry in the whole grouting process is simulated. Uniaxial compression, shear strength and permeability tests are conducted on the samples taken at different grouting pressures and at different locations, and the whole stone body under different grouting pressures is sampled and observed to examine the anti-seepage reinforcement effect and the slurry diffusion mode of the high-solid phase segregation slurry, which is composed of fully weathered granite particles, in the fully weathered granite. The results show that the slurry has undergone three stages of permeation and diffusion, compaction and compression, and cleavage and expansion in the process of fully weathered granite formation diffusion, and the high solid phase segregation grout with fully weathered granites as the main body has a remarkable effect on the grouting of fully weathered granites. With the increasing grouting pressure, the uniaxial compressive strength is significantly increased to 3.25-13.67 times the original soil mass, and the shear strength is increased to 1.63-2.69 times the original soil mass under different normal pressures. The permeability decreases from 10?4 cm/s to 10?5 cm/s or 10?-6 cm/s. Therefore, the high solid phase segregation slurry has a significant anti-seepage effect on the fully weathered granite. |
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| Keywords: | fully weathered granite high solid phase segregation slurry grouting pressure grouting effect slurry diffusion pattern |
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