Device and method for simulating engineering impact induced karst collapse in seepage environment

Abstract

The invention provides a device and method for simulating engineering impact induced karst collapse in a seepage environment, a test box assembly comprises a coverless first test box and a second test box, the first test box is located above the second test box, the inner space of the first test box is divided into water distribution cavities located at two ends and a test cavity located in the middle by two filter partition plates, and the filter partition plates are located in the test cavity; the test cavity is filled with a soil body, a karst cave simulation hole is formed in the part, located in the test cavity, of the bottom of the first test box, and the first test box is communicated with the second test box through the karst cave simulation hole; the impact working condition simulation assembly comprises a supporting piece and a drill rod, the supporting piece is erected at the upper end of the first test box, a drop hammer is hung at the upper end of the supporting piece, the drill rod is connected with the lower end of the supporting piece in an up-down sliding mode, a drill bit is vertically downward, and the drill rod is located under the drop hammer and located above the karst cave simulation hole; the two water level control assemblies are used for controlling the water level. The device is simple in structure and can simulate karst collapse induced by engineering impact in a seepage environment.

Description

technical field [0001] The invention relates to the technical field of exploration geotechnical construction, in particular to a device and method for engineering shock-induced karst collapse in a simulated seepage environment. Background technique [0002] Covering karst collapse refers to the sudden deformation and damage caused by the destruction of the balance of the soil covering the karst cave due to natural or human factors, and most of the results are the formation of subsidence pits. [0003] Acid, alkali and salt are widely distributed in my country, accounting for about one-third of my country's land area. Taking Wuhan as an example, the hidden soluble rocks in Wuhan account for 12.85% of the total area of ​​Wuhan. The dual structure of “upper sticky and lower sand” of the sand layer, with the development of human engineering activities, engineering impact (such as punching pile construction, drilling vibration, etc.) near the cave will directly affect the soil abo...

AI Technical Summary

Problems solved by technology

For this reason, people have conducted a series of researches on the cause and development process of karst collapse, but the particularity of karst collapse itself makes it impossible to conduct field research. The causes and development process of the collapse are studied and explored in order to provide a scientific basis for the prediction of karst collapse in actual production and life

[0005] At present, the devices used to simulate karst subsidence generally only consider the influence of groundwater and other factors, and do not take into account the influence of factors such as external man-made engineering shocks. Therefore, for areas where engineering shocks are active, the current device The reference value of the generated simulation results is low, so exploring the mechanism of overburden karst collapse induced by engineering shock in the seepage environment has become a major problem to be solved urgently in the engineering field

Images