Testing device and method for simulating collapse of tunnel surrounding rock under conditions of rainfall and underground water seepage

Abstract

The invention discloses a testing device and a testing device method for simulating collapse of tunnel surrounding rock under conditions of rainfall and underground water seepage. The testing device comprises a model testing box, a rainfall adjustable simulating system, an underground water seepage simulating system, an underground water supplying system, a water content testing system, a stress monitoring system, a digital radiography noncontact measuring system and an optical fiber bragg grating displacement monitoring system. By simulating a progressive failure process of tunnel weak broken surrounding rock under the action of seepage of surface water and underground water, mechanical behaviors of crushing the surrounding rock under different rainfall conditions and different underground water seepage path conditions are quantitatively researched. By obtaining multiple-physical field information in a tunnel surrounding rock collapse process, multi-information features in different evolutionary phases and internal links of information of all fields of the collapse are analyzed, a progressive failure process and fracture morphology and ranges of the tunnel weak broken surrounding rock under different factors are determined, and the effective basis is provided for disclosing a progressive failure principle and a dynamic pressure arch effect of the weak broken surrounding rock under conditions of rainfall and underground water seepage.

Description

technical field [0001] The invention relates to a tunnel model test device and method, in particular to a multifunctional tunnel model test device and method suitable for simulating surface water and groundwater seepage, and belongs to the field of tunnel engineering geological disaster model tests. Background technique [0002] With the vigorous development of my country's traffic construction, the growth rate of tunnels is getting faster and faster, and the construction scale is getting bigger and bigger. In the construction of tunnels, there is a saying of "ten tunnels and nine leaks". Under the action of long-term groundwater, the surrounding rock of the tunnel is prone to large deformation and even instability and failure. Since the excavation of the tunnel itself may form a water collection corridor, it will also cause the stress redistribution of the surrounding rock, resulting in an increase in the permeability coefficient of the surrounding rock, thereby increasing ...

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Problems solved by technology

At present, there are few reports on quantitative research on the mechanical behavior of surface water or groundwater on broken surrounding rock, especially the tunnel model tests of rainfall and groundwater seepage are still rare. For tunnels under different rainfall patterns and different groundwater seepage paths, etc. Deformation failure studies, lack of rational interpretation and analysis of model test setups

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