Monitoring method of bottom soil heave of excavation foundation pit

Abstract

The invention belongs to the technical field of foundation pit deformation monitoring and particularly relates to a monitoring method of a bottom soil heave of an excavation foundation pit. The monitoring method comprises the specific steps of: arranging a prism hoisting device on a monitoring point at the bottom of an excavated foundation pit and fixing a prism at the top; erecting a total station for forming intervisibility with the prism on the ground outside the foundation pit so as to realize the aim of monitoring the deformation amount of the bottom soil heave of the foundation pit; meanwhile, selecting a standard point on a stable building outside the foundation pit and setting the prism so as to monitor a micro deformation amount of a work station and revise a measured value of the monitoring point according to the micro deformation amount, thus improving the measuring precision. The monitoring method disclosed by the invention has the advantages that the deformation amount of the bottom soil heave of the foundation pit is monitored in real time; the operation method is simple and convenient; a monitoring device is existing equipment, the cost is low and the measurement precision is high; the prism hoisting device can randomly adjust and measure the needed height so that the intervisibility is formed by the prism and the total station all the time; the monitoring method is particularly suitable for foundation pit engineering in an excavation process.

Description

technical field [0001] The invention belongs to the technical field of foundation pit deformation monitoring, and in particular relates to a monitoring method for soil uplift at the bottom of an excavated foundation pit. Background technique [0002] With the rapid development of urban construction, underground spaces for various purposes have been developed and utilized in major cities around the world, resulting in a large number of foundation pit projects. Due to excavation and unloading in the foundation pit engineering, the stress of the base soil will change, and certain uplift deformation will inevitably occur. The uplift deformation is in the shape of a reversed pot bottom. The amount of uplift is maximum. Its uplift deformation is generally considered to be mainly caused by the following factors: (a) rebound deformation caused by excavation and unloading of soil; (c) Due to the existence of the weak layer at the bottom of the foundation pit, plastic flow is genera...

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Problems solved by technology

[0004] At present, there are mainly the following methods for monitoring the uplift deformation of foundation pit bottom soil: (1) For example, patent 201310008246.9 discloses a "three-dimensional digital early warning method and system for remote intelligent monitoring of deep foundation pit bottom uplift". The uplift deformation data is collected by installing several static levels on the bottom of the deep foundation pit, and wirelessly transmitted to a remote computer to visualize the 3D model through the corresponding software components; the disadvantage of this method is that the cost of static levels is high, and multiple static levels Only the relative settlement can be measured between the levels, and when the area where multiple static levels are l

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