传统民居地基土简易判定与地基基础加固技术试验研究

发布时间：2018-02-11 14:25

本文关键词： 土木建筑工程施工传统民居地基土判定地基基础加固人力落锤探铲法水泥注浆法静压桩法　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：为了提升传统民居结构安全性能,研发了相应地基土简易判定方法;通过传统民居地基基础加固基地内示范性工程实例,研究地基注浆加固、基础静压桩加固相应设计、施工、监测方法,为相应技术推广提供依据。总结现有地基土土类简易判定方法,在此基础上提出“人力落锤探铲法”用于传统民居地基土的判定。选定河南省驻马店市西平县焦庄乡董庄村作为试验基地,采用水泥注浆法和静力压桩法两种加固方法对原有房屋地基基础进行加固试验。研究得出如下主要结论:(1)根据传统民居地基土判定的特点及地基土的分类方法,总结几种常用传统民居地基土土类简易判定方法,即搓条法、刀切法、锤击法、手捻法以及干土块浸水法;同条件下标准贯入试验击数N63.5和人力落锤探铲试验击数S_(10)之间具有相关性,在粉土场地相关性公式为63.5 10N=1.1229S+0.3559,相关系数=0.93002R;在粉质黏土场地相关性公式为63.5 10N=1.2999S-2.4447,相关系数=0.93182R。(2)对浅层地基采用注浆法进行加固时,单独封孔极易出现漏浆、跑浆现象,采用设置有止浆板、止浆肋的分组封孔技术能很好的解决这个问题,同时室外止浆板可同时用作散水,室内止浆板可用作室内地坪;浅层地基的注浆加固过程中注浆压力不易控制,试验过程中最大注浆压力约0.15MPa;采用注浆法对浅层地基进行加固,对基础有一定的抬升效果,抬升效果与基础上部荷载有关,上部荷载越大,抬升量越小;采用水泥注浆法对传统民居浅层粉质黏土地基进行加固时,其浆液填充率f=8.36%~14.40%,平均浆液填充率`f=10.70%;浆液填充率比例系数k=0.16~0.31,平均浆液填充率比例系数`k=0.23。(3)对浅层基础采用静力压桩法进行加固时,在基础两侧设置反力梁能有效控制被加固结构基础的沉降,在静力压桩过程中,墙体沉降几乎无变化;对浅层基础采用静力压桩法加固,且桩端持力层为粉质黏土的情况下,实测压桩力系数α=1.77~2.31,建议传统民基础加固时终压力设计值以不小于单桩竖向承载力特征值的2.5倍为宜。
[Abstract]:In order to improve the safety performance of traditional residential structures, a simple method for judging the foundation soil is developed, and the corresponding design and construction of foundation grouting reinforcement and foundation static pressure pile reinforcement are studied through an example of demonstration engineering in the foundation reinforcement base of traditional residential buildings. The monitoring method can provide the basis for the popularization of the corresponding technology. On this basis, it is put forward that "manpower drop hammer and shovel method" is used to judge the foundation soil of traditional houses. Dongzhuang Village, Jiaozhuang Township, Xiping County, Zhumadian City, Henan Province, is selected as the test base. Cement grouting method and static pressure pile method are used to strengthen the foundation of the original building. The main conclusions are as follows: 1) according to the characteristics of the traditional residential foundation soil and the classification method of the foundation soil, This paper summarizes several simple judgment methods of traditional residential foundation soil, such as twisting strip method, knife cutting method, hammering method, hand twisting method and dry soil soaking method. Under the same conditions, there is a correlation between the standard penetration test hit number N63.5 and the manual drop shovel test hit number S _ (10). When the correlation formula of silt site is 63.510NU 1.1229S 0.3559, the correlation coefficient is 0.93002R, and the correlation formula is 63.510NU 1.2999S-2.4447, the correlation coefficient is 0.93182R.-2) when the shallow foundation is strengthened by grouting method, it is easy to leak the slurry and run the slurry in the hole sealing alone. This problem can be solved very well by using the technology of packing holes with pulping ribs, while the outside board can be used as water dispersing board, and the indoor board can be used as indoor floor. The grouting pressure is not easy to control in the process of grouting reinforcement of shallow foundation, and the maximum grouting pressure is about 0.15 MPA during the test, and the grouting method is used to reinforce the shallow foundation, which has a certain uplift effect on the foundation, and the uplift effect is related to the upper load of the foundation. When cement grouting method is used to reinforce the shallow silty clay foundation of traditional residential buildings, the higher the load on the upper part is, the smaller the uplift is. When the filling ratio of slurry is 0.16 ~ 0.31, the ratio coefficient of average filling rate of slurry is 0.16 ~ 0.31, and the ratio coefficient of average filling rate of slurry is 0.23. 3) when the shallow foundation is strengthened by static compression pile method, the ratio of filling rate of slurry is 8.36% and 14.40%, and the average filling rate of slurry is 10.70%, and the ratio coefficient of filling rate of slurry is 0.16 ~ 0.31 and the ratio coefficient of average filling rate of slurry is 0.23. 3. Setting reaction beam on both sides of the foundation can effectively control the settlement of the reinforced structure foundation, and the settlement of the wall is almost unchanged in the process of static pressure pile, and the shallow foundation is strengthened by static pressure pile method, and the bearing layer at the end of the pile is silty clay. It is suggested that the design value of ultimate pressure of traditional civil foundation should be not less than 2.5 times of the characteristic value of vertical bearing capacity of single pile.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU44;TU753.3

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