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Study on Different Forms of Vertical Reinforcement in Deep Excavated Pit in Soft-clay Area

Author: XuJunPing
Tutor: XiaTangDai
School: Zhejiang University
Course: Geotechnical Engineering
Keywords: Deep excavation engineering Soil reinforcement Equivalent coefficient of subgrade Effective embedded depth ABAQUS finite element
CLC: TU476
Type: Master's thesis
Year: 2008
Downloads: 225
Quote: 1
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Abstract


Wenzhou New Century Commercial Building, Basement Foundation Pit Engineering test shows : the early variable bit soft soil deep pit excavation process significant impact on the final deformation of the building envelope , while the traditional ignore initial displacement the program will make engineering unsafe . In this project the background to break the tradition of only reinforce the bottom of the pit soil reinforcement , increase pit soil vertical reinforcement height , soil reinforcement to the reinforcement of the supporting parts of the above default way in the bottom of the pit . The current pit design theory based on general sheet pile theory , without considering the displacements and internal forces of the building envelope with the excavation process changes , and therefore can not be considered the beginning of displacement influence factors . Common foundation design software , such as Li-cheng, and building envelope Guinness, although the pit during excavation work condition , the basis for the design envelope structure in all conditions , the maximum internal force and maximum displacement , but still did not consider the pit bottom soil reinforcement excavation previous condition to the bottom of the pit , more reinforcement in the form of this article can not be reflected in the excavation process . First, consider adding certain assumptions on the basis of the calculation method of the excavation process , derive the formula can be considered in this article reinforcement in the form of the introduction of the concept of effective embedded solid depth and the equivalent coefficient of subgrade formula . Subsequently , Wenzhou new century basement foundation pit retaining structure design , for example , this article for engineering tailored five different reinforcement program : ( 1 ) pit soil reinforcement ; (2) traditional pit soil reinforcement in the form reinforcement pit bottom range of 4 m below the soil ; ( 3) from the pit bottom following reinforcement to the third support at the predetermined position ; ( 4 ) reinforcement below the pit bottom to the second support at the predetermined position ; ( 5) from the Pit bottom following reinforcement from the first support at a predetermined position . Analysis and comparison of five reinforcement program . Finally, the use of the ABAQUS finite element software , one can consider the establishment of the excavation process , different vertical reinforcement height , the the 2D pit excavation of different reinforcement width model , simulate and analyze the impact of the width of the reinforcement in the form of this paper , comparative analysis different reinforcement width , surface subsidence, deformation of the pit bottom soil uplift , and building envelope .

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CLC: > Industrial Technology > Building Science > Soil mechanics,foundation engineering > Foundation > The basis of the special form
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