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Test Study and Finite Element Analysis of the Work Mechanism of the Rock Anti-Float Anchor

Author: ZhaoHongFu
Tutor: ZhangMingYi
School: Qingdao Technological University
Course: Structural Engineering
Keywords: Groundwater Buoyancy Anti- floating anchor FEM ANSYS Anchor group effect
CLC: TU472
Type: Master's thesis
Year: 2008
Downloads: 64
Quote: 0
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Abstract


With the rapid development of urban infrastructure, urban land increasingly tense, appears a lot of underground garage, Descented, underground shopping malls, subways and multilayer and direction to the development of ultra-deep basements and other underground construction. However, the pores in the soil and rock fissures occurrence with a lot of groundwater, groundwater on these underground construction can not be ignored, and the buoyancy caused by the groundwater engineering accidents also occurred frequently, so the engineering sector also began to give ground handling buoyancy increasingly high attention. This paper focuses on handling the rock foundation has a unique effect on groundwater buoyancy rocks the application of anti-floating anchor some research. Mainly done the following work: 1, through the groundwater analysis, the impact of the main factors of groundwater buoyancy of groundwater occurrence, flow characteristics, the location of underground structures, basements and basement wall fat groove sidewalls negative friction and other factors, and multi-layered groundwater buoyancy calculations are discussed. 2, through the weathered granite on three strain gauges attached to the rocks in situ field anti-floating anchor destructive testing, results in weathered granite anti-floating anchor under tension, the load distribution along the length of the bolt non-uniform, gradually decreases from top to bottom, in the bottom of a range of basic unstressed; bolt is made of elastic deformation stage of the development phase to the plastic, as the load increases, the plastic zone down; test results in weathered granite in the limit of anti-floating anchor pullout, then come to the weathered granite and the average ultimate bond between anchor force of 439 kPa, comparison found between rock and bolt stick knot strength with regional differences. 3, by using finite element analysis software ANSYS nature of different lengths and different formations under the anti-floating anchor and anchor group effects analysis, the longer the length of anchoring to achieve the ultimate pullout force larger displacement, so rock anti-floating anchor should have a reasonable economic length exceeds this length, to give full play to its lateral friction is needed to produce large displacement, which is structurally stable negative; rock against the nature of the impact of floating anchor capacity is quite large; anchor group effect makes the group a single anchor bolt ultimate pullout force is reduced to a single anchor bolt single ultimate pullout of 0.6 times, so during the design of anti-floating anchor bolt lever pullout resistance design value should be in the single bolt on the basis of experimental reduction, so as to ensure the safety of anti-floating anchor reserves.

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > Artificial foundation reinforcement
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