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采用钻孔埋设传感光纤是岩土体分布式光纤传感直埋技术的一种,为使传感光纤与周围土体变形协调,通常在钻孔内注浆,使传感光纤与周围岩土介质凝固为一体。根据对浆液凝固时间无特定要求和有特定要求的2种情况,通过试验研究了钻孔注浆耦合材料、配合比及其凝固后强度。结果表明:通过调整水泥与膨润土的比例以及水固比可以控制凝固体的无侧限抗压强度,使其强度与原位岩土体的近似相同;添加适量的水玻璃可以加快浆液的凝固速度。针对石家庄某隧道原位土体的力学参数,得到了满足现场施工要求的最优配合比,使浆液凝固后的力学指标与原位土体的近似相同。
Buried hole sensing fiber embedded in rock and soil distributed optical fiber sensing buried technology, in order to make the sensing fiber and surrounding soil deformation coordination, usually in the borehole grouting, the sensing fiber and the surrounding rock Soil medium solidified as a whole. According to the two cases of no specific requirements and specific requirements of slurry solidification time, the coupling grouting material, the mixing ratio and the strength after solidification were studied through experiments. The results show that the unconfined compressive strength of the solidified body can be controlled by adjusting the ratio of cement to bentonite and the ratio of water to solid so that the strength of the solidified body is approximately the same as that of the in-situ rock and soil body. Adding appropriate amount of sodium silicate can speed up the solidification rate . According to the mechanical parameters of a tunnel soil in Shijiazhuang, the optimal ratio of the soil to the on-site construction has been obtained, so that the mechanical index after the slurry solidification is approximately the same as that of the in-situ soil.