Testing device for layered settlement of high fill roadbed or earth and rockfill dam

Abstract

The invention provides a testing device for layered settlement of a high fill roadbed or an earth and rockfill dam. The testing device comprises a reference elevation transmission device, a layered settlement plate, a settlement displacement measuring device and a settlement displacement receiving device; the reference elevation transmission device is buried in the stable ground and is used for upwards transmitting a stable elevation reference point to each sub-layer to ensure that the tested settlement is the settlement of the top surface of each sub-layer; a contact of the settlement displacement measuring device is in contact with an elevation transmission suspension; and the settlement displacement receiving device is connected with the settlement displacement measuring device througha cable. According to the invention, the displacement sensor and the reference elevation transmission device are combined to observe layered settlement of filling bodies such as a high fill subgrade and an earth-rock dam at any time, so that the defects of mutual interference between construction filling and settlement observation pile extension and influence on settlement observation precision intraditional layered settlement observation are greatly reduced; reading observation is carried out at any time, and layered settlement observation efficiency and observation precision are improved.

Description

technical field [0001] The invention relates to the technical field of roadbed, earth-rock dam and foundation settlement testing, in particular to a test device for layered settlement of high-fill roadbed or earth-rock dam. Background technique [0002] High-fill subgrade is a common subgrade structure for mountainous roads. Due to the characteristics of fast filling speed and uneven filling, this kind of subgrade is prone to uneven settlement after construction, causing deformation and cracking of the road surface. In order to understand the change law of settlement at different heights of the embankment during the filling process, it is necessary to observe the change law of embankment settlement at different heights in engineering or scientific research, so as to guide the later construction schedule. Therefore, in order to understand the settlement changes at different heights of the high-fill embankment or earth-rock dam during the filling process from bottom to top, th...

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Problems solved by technology

[0004] This test method has the following deficiencies: (1) The settlement marks are layered settlement piles, and steel pipes are used to transmit the elevation, which needs to be continuously extended upwards. The more layers, the more piles, the difficulty of installation and protection of settlement piles (2) The measurement method is the height measurement of the level instrument and the tower foot. Each measurement needs to use the level instrument for height transfer measurement, and the layered settlement is determined through the calculation of the height difference. The measurement time is long and the workload is high. Large; (3) Measurement accuracy: The settlement of layers is determined by measuring the elevation difference at the top of the settlement pile. Since the settlement of the settlement plate at the bottom of the pile is calculated by the extension length of the rod, the skew of the settlement pile will affect the accuracy of the settlement value of the test ; (4) The reference fixed point (reference elevation point) is a stable elevation level point introduced from the outside of the embankment

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