Device for testing impact of waterside building pit construction on pile foundations

Abstract

The invention relates to a device for testing the impact of the waterside building pit construction on pile foundations. The device for testing the impact of deep foundation pit the waterside building pit construction on the pile foundations belongs to the fields of assessment for the impact of the deep foundation pit and underground engineering construction on the pile foundations and pile foundation optimization design. The device comprises a model box body and a plurality of sensors; a soil body and a plurality of model plates are arranged in the model box body; a foundation pit is formed among the model plates; pile foundations stretching into the soil body and at least one support piece are arranged in the foundation pit; a measurement support is connected to one ends, far away from the soil body, of the pile foundations; two ends of the support piece press against the two model plates; a first river model slot and a second river model slot mutually communicating and located on two sides of the foundation pit are arranged in the model box body; and the sensors are arranged on the soil body, the model plates, the pile foundations and the measurement support. The device can be used for visually simulating a deep foundation pit and the hydraulic power and geological conditions of a near river so as to predict the impact of multi-surface waterside deep and big building pit construction bottom heave springback and pile foundation bearing, is simple in structure and easy to implement functions, and has higher economy and repeatability.

Description

technical field [0001] The invention relates to the field of assessment of the influence of deep foundation pits and underground engineering construction on pile foundations and the optimization design of pile foundations, in particular to a test device for the influence of riverside foundation pit construction on pile foundations. Background technique [0002] In recent years, with the gradual construction and development of urban construction and water conservancy and transportation industries, a large number of deep foundation pit projects have been produced, and underground engineering projects are often constructed near rivers and lakes. Foundation pit projects excavated near rivers are inevitably affected by groundwater. Changes in conditions will cause seepage and asymmetrical loads, making the design and construction more difficult, and the control of the surrounding environment will be stricter. In the construction of deep and large foundation pits on soft soils nea...

AI Technical Summary

Problems solved by technology

In the construction of deep and large foundation pits on soft soils near rivers, especially when the groundwater is mostly facing the river, the groundwater directly participates in the uplift and rebound of the pit bottom. Problems such as spring, engineering pile displacement, unloading and tensile fracture, etc., cause large-scale inclination of the pile foundation at the bottom of the pit or fracture and damage of the pile top, which affects the quality of the project and causes huge economic losses

[0003] There is an important interaction between the uplift rebound of deep and large foundation pits and the bearing properties of pile foundations at the bottom of the pit. However, there is still a lack of intuitive and practical analysis methods at home and abroad. The impact of deformation and the bearing behavior of the pile foundation at the bottom of the pit is evaluated separately, and the uplift rebound of the foundation pit and the bearing capacity of the pile foundation are calculated separately. The analysis theory does not conform to the actual stress conditions of the foundation pit and the pile foundation, which is very blind

In addition, the cost of on-site tests for engineering construction is high, time-consuming, and the stress state of the test is far from the actual situation, or limited to soft soil and groundwater conditions, so it is impossible to conduct research on the springback uplift of the foundation pit and its impact on the springback of the pile at the bottom of the pit. detection

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