阅读说明：本技术 一种基坑开挖过程土压力可视化的模拟实验装置 (A kind of visual imitative experimental appliance of Excavation Process soil pressure ) 是由 陈俊涛 冯德銮 梁仕华 江杰东 于 2019-07-22 设计创作，主要内容包括：一种基坑开挖过程土压力可视化的模拟实验装置,包括透明的模型箱体和数码光弹仪；模型箱体内填充有土颗粒,土颗粒中设有若干个支护桩,若干个支护桩将土颗粒分隔为开挖区域和土体区域,若干个支护桩与土体区域之间设有光弹材料层,模型箱体的一侧由内至外依次设有第一四分之一波片、第一偏振镜和摄像模块,模型箱体的另一侧由内至外依次设有第二四分之一波片、第二偏振镜和光源,光弹材料层、第一偏振镜、第二偏振镜、第一四分之一波片、第二四分之一波片、摄像模块和光源位于同一中轴线上,计算机与摄像模块通过数据线电连接。本发明实现对基坑开挖过程中支护桩上的土压力进行实时模拟并监测,有利于对支护桩和土体进行针对性加固维护。(A kind of visual imitative experimental appliance of Excavation Process soil pressure, including transparent model cabinet sum number code photo-elastic instrument；Soil particle is filled in model casing body, several support piles are equipped in soil particle, soil particle is divided by several support piles excavates region and soil body region, photoelastic material layer is equipped between several support piles and soil body region, the side of model cabinet is successively arranged the first quarter-wave plate from the inside to the outside, first polariscope and photographing module, the other side of model cabinet is successively arranged the second quarter-wave plate from the inside to the outside, second polariscope and light source, photoelastic material layer, first polariscope, second polariscope, first quarter-wave plate, second quarter-wave plate, photographing module and light source are located on same central axes, computer is electrically connected with photographing module by data line.Present invention realization is simulated and is monitored in real time to the soil pressure on support pile in Excavation Process, is conducive to carry out support pile and the soil body specific aim reinforcing maintenance.)

1. a kind of visual imitative experimental appliance of Excavation Process soil pressure, it is characterised in that: including transparent model casing Body and digital photo-elastic instrument, digital photo-elastic instrument include computer, photographing module, photoelastic material layer, the first polariscope, the second polarization Mirror, the first quarter-wave plate, the second quarter-wave plate and light source；Model cabinet is the cabinet of opened top, model cabinet It is interior to be filled with soil particle, be equipped with several support piles in soil particle, several support piles soil particle is divided into excavate region and Soil body region is equipped with photoelastic material layer between several support piles and soil body region, the side of model cabinet is from the inside to the outside successively Equipped with the first quarter-wave plate, the first polariscope and photographing module, the other side of model cabinet is successively arranged from the inside to the outside Two quarter-wave plates, the second polariscope and light source, photoelastic material layer, the first polariscope, the second polariscope, the first a quarter Wave plate, the second quarter-wave plate, photographing module and light source are located on same central axes, and computer and photographing module pass through data Line electrical connection.

2. the visual imitative experimental appliance of Excavation Process soil pressure according to claim 1, it is characterised in that: institute It states and is equipped with flexiplast film layer between soil body region and photoelastic material layer.

Technical field

The present invention relates to a kind of visual imitative experimental appliances of Excavation Process soil pressure.

Background technique

During excavation of foundation pit, the soil body is always to the specific development process of soil pressure that pile body applies on the outside of support pile Perplex the big problem of scholars, if it is possible to clearly predict the soil pressure that applies to pile body of the soil body on the outside of support pile, then it can be with The stress condition for understanding support pile in Excavation Process is conducive to carry out support pile and the soil body specific aim reinforcing maintenance, protect Card deep excavation project can safely be gone on smoothly.Currently, in order to have a clear understanding of in digging process on support pile by Soil pressure be how to develop and formed, some scholars are tested using soil pressure cell, but soil pressure cell itself week It encloses and has stress field, can not accurately measure soil pressure.And some scholars by PIV technology to the displacement of soil particle come inverse with The distribution of pressure, but this method is easy to error occur during inverse soil pressure.

In conclusion applicants contemplate that in order to become apparent from the soil pressure on intuitively observation support pile in digging process In evolutionary process and characteristic distributions, it is necessary to provide a kind of Excavation Process soil pressure visual simulated experiment dress It sets.

Summary of the invention

Present invention aims to overcome that the shortcomings that prior art and insufficient, providing a kind of Excavation Process soil pressure can Depending on the imitative experimental appliance changed, by the way that the soil pressure on support pile in Excavation Process is simulated and is monitored in real time, with The stress condition that support pile in Excavation Process can be obtained is conducive to carry out support pile and the soil body specific aim reinforcing dimension Shield.

To achieve the above object, The technical solution adopted by the invention is as follows:

A kind of visual imitative experimental appliance of Excavation Process soil pressure, including transparent model cabinet sum number code light Instrument is played, digital photo-elastic instrument includes computer, photographing module, photoelastic material layer, the first polariscope, the second polariscope, the one or four point One of wave plate, the second quarter-wave plate and light source；Model cabinet is the cabinet of opened top, is filled with soil in model casing body , several support piles are equipped in soil particle, soil particle is divided by several support piles excavates region and soil body region, several It is equipped with photoelastic material layer between a support pile and soil body region, the side of model cabinet is successively arranged the one or four from the inside to the outside/ One wave plate, the first polariscope and photographing module, the other side of model cabinet be successively arranged from the inside to the outside the second quarter-wave plate, Second polariscope and light source, photoelastic material layer, the first polariscope, the second polariscope, the first quarter-wave plate, the two or four/ One wave plate, photographing module and light source are located on same central axes, and computer is electrically connected with photographing module by data line.

From the foregoing, it will be observed that when in use, the present invention is filled with soil particle using transparent model cabinet, it then will be digital photoelastic Instrument arranges, and digs pit in the excavation region of soil particle, successively cuts out the soil body for excavating region according to working condition requirement, was excavating Cheng Zhong, the soil body for excavating area top point are dug up, then the soil body in soil body region can generate soil pressure to support pile, and soil pressure exists Complicated variation can occur during excavating region soil excavation.

It is the transparent material with birefringence additionally, due to photoelastic material, this material is in the state of no stress Without birefringence, but working as it is that optical anisotropy can be shown in polarized light field by stress, is occurred Birefringent phenomenon generates colored interference fringe picture, and the color gradient of Color Interfering Fringes By Use figure is under different stresses It can change, therefore according to the relationship between color gradient and stress, so that it may realize the calibration to photoelastic material；Therefore exist It excavates and emits light to photoelastic material layer using light source while the region soil body constantly excavates, and record photoelastic material with photographing module Bed of material image, and the Color Interfering Fringes By Use figure changed, and a series of Color Interfering Fringes By Use figure of variations is sent to calculating Machine, computer demarcate Color Interfering Fringes By Use figure, obtain photoelastic material layer according to the result of calibration and are excavating the region soil body Change of stress field situation in digging process, namely it is that of obtaining the stress condition of support pile in Excavation Process, thus real Now the soil pressure on support pile in Excavation Process is simulated and monitored in real time, is conducive to carry out support pile and the soil body Specific aim reinforces maintenance, and ensures the safety to support pile and the soil body, while can save operating expenses.

As an improvement of the present invention, flexiplast film layer is equipped between the soil body region and photoelastic material layer.

Compared with prior art, the innovative point of technical solution of the present invention and beneficial effect are:

The present invention while excavating the region soil body and constantly excavating using light source to photoelastic material layer transmitting light, and with taking the photograph As module records photoelastic material layer image, then Color Interfering Fringes By Use figure is demarcated using computer, according to the knot of calibration Fruit obtains change of stress field situation of photoelastic material layer during excavating region soil excavation, namely is that of obtaining excavation of foundation pit The stress condition of support pile in the process carries out simulation in real time simultaneously to the soil pressure on support pile in Excavation Process to realize Monitoring is conducive to carry out support pile and the soil body specific aim reinforcing maintenance, and ensures the safety to support pile and the soil body, while can To save operating expenses.

Detailed description of the invention

Fig. 1 is the schematic diagram of the visual imitative experimental appliance of Excavation Process soil pressure of the present invention；

Fig. 2 is the cross-sectional view of the visual imitative experimental appliance model cabinet of Excavation Process soil pressure of the present invention.

Specific embodiment

Present invention will be further explained below with reference to the attached drawings and examples.It is understood that tool described herein Body embodiment is used only for explaining the present invention rather than limiting the invention.It also should be noted that for the ease of retouching It states, only some but not all contents related to the present invention are shown in the drawings.