直埋式光纤传感钻孔注浆耦合材料配合比试验研究  

Experiments on Coupling Materials' Proportioning of Borehole Grouting in Directly Implanted Optic Fiber Sensing

作　　者：杨豪[1] 张丹[1] 施斌[1] 干昆蓉[2] 段朝峰[1] 

机构地区：[1]南京大学地球科学与工程学院,南京210093 [2]中国中铁隧道集团有限公司技术中心,河南洛阳471009

出　　处：《防灾减灾工程学报》2012年第6期714-719,共6页Journal of Disaster Prevention and Mitigation Engineering

基　　金：铁道部科技研究开发计划课题(2009G006-B);国家重点基础研究发展计划(973计划)课题(2011CB710605)资助

摘　　要：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。Implanting sensing fiber by drilling is a kind of directly laying technique for distributed optical fiber sensing. The deformation compatibility of the sensing fiber with the surrounding in-situ soil can be guaranteed by grouting the borehole. In this paper, the borehole grouting coupling materials, reasonable proportioning of the grouting materials and the strength of the setting materials are studied by experiments according to the requirements for the setting time. Experimental results show that the strength of the con- solidation samples are primarily affected by the ratio of cement to bentonite and water-solid ratio. Reason- able proportion of sodium silicate can accelerate the speed of the solidification. Based on the experimental data of the in-situ undisturbed soil, the best mixture ratio of the coupling material is obtained, which can meet the requirements of mobility for field operation and the mechanical features of the consolidation sam- ples are almost consistent with those of in-situ soil.

关 键 词：分布式光纤传感技术 土体直埋技术 耦合注浆 配合比 无侧限抗压强度 

分 类 号：TU473.1[建筑科学—结构工程]