地下连续墙施工过程中的变形控制研究

发布时间：2018-03-20 01:28

本文选题：地下连续墙　切入点：泥浆成槽　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着地下连续墙在深基坑工程和地下构筑物建设中越来越广泛的应用,地下连续墙成槽施工对周边环境的影响也越来越受到重视。分析地下连续墙成槽施工对周边环境的影响,研究成槽施工中的变形控制措施是很有必要的。本文主要采用数值模拟和现场监测等分析手段,对成槽施工中周边土体的变形规律和变形控制措施进行了研究,主要研究内容和结论如下：1、为分析地下连续墙成槽施工对的槽段周边土体的影响,通过数值模拟,研究了槽段附近土体的水平应力、地面沉降、槽壁侧向变形的变化规律,对比研究了槽段尺寸与地面沉降和槽壁侧向变形的关系。结果表明,槽段外土体存在水平土拱效应和竖向土拱效应；槽段外土体变形在上部主要表现为沉降,在下部主要表现为侧向变形；成槽开挖引起的变形与槽段尺寸直接相关,可以通过它们来预估地面沉降和槽壁侧向变形。2、为分析地下连续墙成槽施工对邻近建筑的影响,通过数值模拟,研究了邻近建筑基底沉降、槽壁侧向变形及基础下土体侧向变形的变化规律。结果表明,邻近建筑的存在使得槽壁上部侧向变形明显增大；邻近建筑范围内的地面沉降增加,邻近建筑产生不均匀沉降；基础下一定范围内的土体发生较明显的侧向变形,成槽开挖对邻近建筑的影响较大。3、为分析地下连续墙成槽施工引起变形的影响因素,通过数值模拟,研究了泥浆重度、土体参数、地面超载、槽壁加固、导墙及混凝土地坪等对成槽引起变形的影响。结果表明,地面沉降和槽壁侧向变形随着泥浆重度、土体黏聚力的增大而线性减小,随土体压缩模量的增加而成反比减小；地面超载对槽壁浅层侧向变形有影响；槽壁加固可明显限制加固范围内土体的变形,增大加固深度的变形控制效果要好于增大加固宽度带来的变形控制效果。4、为分析地下连续墙成槽施工的变形控制措施,结合上述的变形规律分析及影响因素分析,从控制开挖变形、隔断变形路径、增强保护对象三方面总结了各环节的变形控制措施,并给出了一些实际工程的施工建议。综上,地下连续墙成槽施工会引起槽段周边土体变形,对周边环境产生一定的影响,在工程施工中需根据实际情况选择合适的变形控制措施来限制成槽开挖引起的变形,进而控制地下连续墙成槽施工对周边环境的影响。
[Abstract]:With the increasing application of underground continuous wall in deep foundation pit engineering and underground structure construction, more and more attention is paid to the influence of underground continuous wall grooving construction on the surrounding environment, and the influence of underground continuous wall grooving construction on the surrounding environment is analyzed. It is necessary to study the deformation control measures in the trench construction. In this paper, the deformation law and deformation control measures of surrounding soil are studied by means of numerical simulation and field monitoring. The main research contents and conclusions are as follows: in order to analyze the influence of underground continuous wall grooving construction on the surrounding soil mass of the slot section, the variation law of horizontal stress, land subsidence and lateral deformation of the groove wall is studied by numerical simulation. The results show that the horizontal soil arch effect and vertical soil arch effect exist in the soil outside the slot section, and the deformation of the soil outside the slot section is mainly the settlement in the upper part. The deformation caused by the trench excavation is directly related to the size of the slot section, and it can be used to estimate the ground subsidence and the lateral deformation of the groove wall. 2. In order to analyze the influence of the grooving construction of the underground continuous wall on the adjacent buildings, Through numerical simulation, the variation law of foundation settlement, lateral deformation of groove wall and lateral deformation of soil under the foundation are studied. The results show that the lateral deformation of groove wall increases obviously because of the existence of adjacent building. The ground settlement in the adjacent buildings increases, and the adjacent buildings produce uneven settlement. In a certain range of foundation, the soil has obvious lateral deformation. The influence of grooving excavation on adjacent buildings is great. 3. In order to analyze the influence factors of deformation caused by grooving construction of underground continuous wall, the heavy mud, soil parameters, ground overload and groove wall reinforcement are studied by numerical simulation. The results show that the ground subsidence and lateral deformation of the groove wall decrease linearly with the increase of the soil mass cohesion and decrease inversely with the increase of the compression modulus of the soil. The surface overloading has an effect on the lateral deformation of shallow layer of the groove wall, and the reinforcement of the groove wall can obviously limit the deformation of the soil in the reinforcement area. The effect of deformation control by increasing the depth of reinforcement is better than that by increasing the width of reinforcement. 4. In order to analyze the deformation control measures of underground continuous wall grooving construction, combined with the above analysis of deformation law and analysis of influencing factors, The deformation control measures of each link are summarized from three aspects of controlling excavation deformation, separating deformation path and strengthening protection object, and some practical construction suggestions are given. The underground continuous wall slotted construction will cause the deformation of soil around the slot section, which will have a certain influence on the surrounding environment. In engineering construction, appropriate deformation control measures should be selected according to the actual situation to limit the deformation caused by the trench excavation. And then control the influence of underground continuous wall grooving construction on the surrounding environment.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU753

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