An experimental system for simulating rainfall-induced failure of reverse-order grain deposits

Abstract

The invention relates to a rainfall simulation experiment system in the technical field of civil engineering, and specifically discloses an experiment system for simulating rainfall-induced destruction of a reverse-order grain accumulation body, including an accumulation body model, a measurement system and a rainfall simulation device; the accumulation body model is composed of quartz The sand is piled up and positioned in the model groove, and the pile model is layered from top to bottom through the separation of colored spacer strips; the measurement system includes a laser displacement sensor, a wire-pull displacement sensor, A water content sensor, a pore water pressure sensor, an acoustic emission sensor, a processor and a PIV system; the rainfall simulation device includes a number of spray units arranged above the accumulation body model, a water tank for water storage, and a water tank connected to the spray unit and the PIV system. Between the tanks is a water pump for delivering rainwater to the sprinkler unit and a rainfall intensity control assembly for controlling the rainfall intensity. The invention can be used for rain-induced deformation and landslide tests of different slope models.

Description

technical field [0001] The invention relates to a rainfall simulation experiment system in the technical field of civil engineering, in particular to an experiment system for simulating rainfall-induced damage of reverse-order grain accumulations. Background technique [0002] my country is an area affected by the summer monsoon, and the rainfall is relatively large in the rainy season. Heavy rainfall is one of the main factors that induce landslides, especially the deformation and damage of the accumulation slopes. Due to the large size and other characteristics, it seriously threatens the construction of infrastructure and the safety of people's lives and property; because the reverse grain order distribution of the landslide deposits directly affects the porosity and water permeability of the deposits, which in turn affects the stability of the deposits under the action of rainfall, rainfall-induced The research on the coupling mechanism of erosion-subsurface erosion-seepag...

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Problems solved by technology

[0004] However, the existing rainfall simulation accumulation body failure model device has a single function, especially it is impossible to simultaneously observe the changes in the volumetric moisture content and pore water pressure of the soil during the rainfall process. The influence of factors on the instability law of rainfall-type accumulation landslides also needs to be further studied

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