Method for monitoring rush of confined water in ultra-large and ultra-deep foundation pit excavation

Abstract

The invention discloses a method for monitoring rush of confined water in ultra-large and ultra-deep foundation pit excavation. The method comprises the following steps that S1, a hole is drilled in a foundation pit; S2, a device is fixed and arranged; S3, a drainage pipe is fixed; S4, the confined water is measured; S5, drainage is treated; and S6, a deformation value of a pit bottom heave of the foundation pit is measured. According to the method, the confined water can be intelligently monitored, a stratum containing the confined water can accurately reached, a heave value of the deep foundation pit can be measured, and the method has the advantages of simplicity in operation, low manufacturing cost, intelligence and the like.

Description

technical field [0001] The invention belongs to the technical field of foundation pit engineering monitoring, and relates to a method for monitoring the inrush of pressurized water in excavation of super-large and deep foundation pits, which is suitable for monitoring the inrush of pressurized water in excavation strata of foundation pits. Background technique [0002] In coastal areas, there are abundant groundwater, complex foundation soil layers, and weak permeable layers. During the construction process of excavating super-large and ultra-deep foundation pits, there will be confined water in the soil layer. The existence of confined water will cause foundation pits The problem of uplift and instability of the bottom is one of the major risk sources of deep foundation pit engineering. [0003] At present, in order to ensure the safety during the excavation of deep foundation pits, the first solution is to insert the water-stop curtain into the water-resisting layer below ...

AI Technical Summary

Problems solved by technology

When a confining water inrush occurs in a deep foundation pit, because the self-weight pressure of the overlying soil layer cannot withstand the pressure of the confined water head, groundwater will flow into the deep foundation pit. In addition, it will increase the difficulty of construction, construction procedures, and shorten the construction period Longer, higher construction costs

There are two problems in the existing device for the inrush of pressurized water: one is that the pressure change of the pressurized water cannot be judged by the device, and it can only be solved by precipitation; the other is that the inrush caused by the pressurized water will cause Caused the uplift of the bottom of the foundation pit, there is no equipment to measure the change of the uplift value of the bottom of the pit

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