深圳市岩溶塌陷监测区土体变形与光纤应变关系室内模拟试验

Abstract

目前国内外在岩溶塌陷分布式监测及预测预报方面还没有成功的应用，在现场实施方面也没有成熟的经验，野外光纤监测仅反应的是光纤的应变量分布及变化，而我们实际需要的是土体的具体沉降量。因此，我们需要建立光纤应变与土体变形的关系，通过光纤应变能够直观反映土体变形量大小。本次试验的主要目的是通过物理模型试验，室内再现不同条件下岩溶塌陷发育的全过程，以此建立土体沉降变形与光纤应变的关系，进而研究岩溶塌陷发育的临界条件，以指导野外监测工作，达到预警预报效果。 Sinkhole collapse at home and abroad in the distributed monitoring and forecasting have not yet successful applications, implementation in the field and no mature experience, field optical fiber monitoring only reflects fiber strain distribution and change, and we really need is specific soil settlement. Therefore, we need to build the relationship in fiber-optic strain and soil deformation, through fiber-optic strain can intuitively reflect the size of soil deformation. The main purpose of this experiment is reproducing the whole process of development of sinkhole collapse under different conditions indoor through physical model experiment, in order to establish the relationship in the settlement of soil deformation and fiber strain, and then research the critical condition of sinkhole collapse development, to guide the field monitoring and achieve early warning and forecast results.