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Testing device and method for roadbed widening reinforcing effect for geogrid treating

A technology of geogrid and test device, which is applied in the direction of basic structure test, road, road, etc., can solve the problems of deformation, settlement and pressure change without adding geogrid, complex problems, etc., and achieve high economy and monitoring The effect of perfect system and high applicability

Pending Publication Date: 2018-07-31
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the problems involved in the widening project are much more complicated than that of the new construction. It not only needs to consider the settlement and deformation of the newly widened roadbed under its own gravity, but also considers the impact of the new roadbed load on the old roadbed. It is a soft ground section) without excessive differential settlement to avoid deformation and cracking of the road surface
[0003] Although there are many studies on road widening, there is no research on the settlement and pressure changes of reinforced subgrades by adding geogrids.

Method used

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  • Testing device and method for roadbed widening reinforcing effect for geogrid treating
  • Testing device and method for roadbed widening reinforcing effect for geogrid treating
  • Testing device and method for roadbed widening reinforcing effect for geogrid treating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Dry sand can be used as roadbed filling material.

[0059] Assemble the base bracket and model frame of the test device and the structure in the model frame, embed an earth pressure gauge inside the roadbed, install an electronic dial indicator on the surface of the roadbed, connect the earth pressure gauge to the strain gauge acquisition box through a data line, and The signal acquisition and analysis system records the data, and then fills the sand and soil layer by layer. It is divided into three layers. The thickness of each layer is 15cm, 30cm, and 30cm. The 30cm range on one side of the buried instrument is tamped with a tamper, and the other parts are tamped manually with a tamping plate, and the relative density is controlled to be above 80% and recorded. When carrying out the movable plate rotation test, 15cm of dry sand should be filled first, and after compaction, earth pressure gauges should be arranged according to the set distance; continue to be filled wi...

Embodiment 2

[0061] Dry sand can be used as roadbed filling material.

[0062] Assemble the base bracket and model frame of the test device and the structure in the model frame, embed an earth pressure gauge inside the roadbed, install an electronic dial indicator on the surface of the roadbed, connect the earth pressure gauge to the data acquisition box through the data line, and pass the dynamic signal The collection and analysis system records the data, and then fills the sand and soil layer by layer. It is divided into three layers. The thickness of each layer is 15cm, 30cm, and 30cm. The 30cm range on one side of the instrument is tamped with a tamper, and the other parts are tamped manually with a tamping plate, and the relative density is controlled to be above 80% and recorded. When carrying out the movable plate rotation test, 15cm of dry sand should be filled first, and after compaction, earth pressure gauges should be arranged according to the set distance; continue to be filled...

Embodiment 3

[0064] Dry sand can be used as roadbed filling material.

[0065] Assemble the support of the test device, the model frame and the structure in the model frame, embed an earth pressure gauge inside the roadbed, install an electronic dial indicator on the surface of the roadbed, connect the earth pressure gauge to the data acquisition box through a data line, and collect The analysis system records the data, and then fills the sand and soil layer by layer. It is divided into three layers. The thickness of each layer is 15cm, 30cm, and 30cm. Use a rammer within 30cm of one side to tamp it, and use a tamping plate to tamp the other parts manually, and control its relative density to more than 80% and make a record. When carrying out the movable plate rotation test, 15cm of dry sand should be filled first, and after compaction, earth pressure gauges should be arranged according to the set distance, and the first layer of geogrid should be laid; continue to fill with 30cm of dry sa...

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Abstract

The invention discloses a testing device and method for the roadbed widening reinforcing effect for geogrid treating, and the testing device and method solve the problem that whether the roadbed widening settling volume is influenced by geogrid application in roadbed widening or not is not involved in the prior art and have the beneficial effect that the pressure distribution rule of different layers of soil in the settlement process is obtained. According to the following scheme, the testing device for the roadbed widening reinforcing effect for geogrid treating comprises a model frame, the model frame is internally provided with a fixed plate for simulating an old roadbed, a movable plate for simulating roadbed widening is arranged on one side of the fixed plate in the model frame, the movable plate is rotationally arranged relative to the fixed plate, and the surfaces of the fixed plate and the movable plate in the model frame are provided with rear filled soil, the rear filled soilis internally provided with a geogrid, and a plurality of soil pressure meters are arranged in the rear filled soil.

Description

technical field [0001] The invention relates to the field of roadbed widening, in particular to a test device and method for treating the reinforcement effect of widening roadbed with geogrids. Background technique [0002] In recent years, with the rapid development of China's transportation construction, there have been more and more expressway widening projects. However, due to the differences in the construction history, filling and compaction degree of the old and new roadbeds when widening the roadbed, the top surface of the old and new roadbeds will produce lateral uneven settlement deformation. In the early stage of expressway construction in my country, due to the constraints of the economic and technological level at that time, most of the expressways that have been built and put into use are two-way four-lane scales, and the proportion of expressways with two-way six-lane sections and above very low. However, with the rapid development of the economy, expressways...

Claims

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Application Information

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IPC IPC(8): E02D33/00E01C3/04
CPCE01C3/04E02D33/00E02D2300/0084
Inventor 宋修广杨振宇李为传鲁亮孙润生张宏博刘源
Owner SHANDONG UNIV