电力勘测设计
電力勘測設計
전력감측설계
ELECTRIC POWER SURVEY
2015年
z1期
203-206
,共4页
干旱气候%红黏土%收缩变形%地基处理
榦旱氣候%紅黏土%收縮變形%地基處理
간한기후%홍점토%수축변형%지기처리
drought climate%red clay%shrinkage deformation%foundation treatment
红黏土在云南省大部分地区广泛分布，昆明地区红黏土最典型的特征是失水后收缩复浸水膨胀，不能恢复到原位，以收缩变形为主。由于昆明地区出现连续四年干旱的极端气候，蒸发量远大于降水量，导致大气影响深度和急剧层深度不同程度的加深。本文以某送电线路N12号塔、N24号塔基础沉降分析为例，通过现场勘测和钻探揭露，以及对不同深度红黏土含水率的测定，表明在2013年雨季之前昆明地区的大气影响急剧层深度大于7.00 m。分析红黏土在正常的气候状况下其失水量很小，收缩变形量也很小，但受极端干旱气候影响，使得基础底面以下的红黏土含水量大幅降低，红黏土失水后收缩变形，在大气影响急剧层深度范围内，土岩组合地基基础底面以下红黏土厚度相差较大，铁塔基础易产生不均匀沉降，红黏土收缩变形量与基底以下红黏土厚度成正相关关系。并对地基处理提出了建议。
紅黏土在雲南省大部分地區廣汎分佈，昆明地區紅黏土最典型的特徵是失水後收縮複浸水膨脹，不能恢複到原位，以收縮變形為主。由于昆明地區齣現連續四年榦旱的極耑氣候，蒸髮量遠大于降水量，導緻大氣影響深度和急劇層深度不同程度的加深。本文以某送電線路N12號塔、N24號塔基礎沉降分析為例，通過現場勘測和鑽探揭露，以及對不同深度紅黏土含水率的測定，錶明在2013年雨季之前昆明地區的大氣影響急劇層深度大于7.00 m。分析紅黏土在正常的氣候狀況下其失水量很小，收縮變形量也很小，但受極耑榦旱氣候影響，使得基礎底麵以下的紅黏土含水量大幅降低，紅黏土失水後收縮變形，在大氣影響急劇層深度範圍內，土巖組閤地基基礎底麵以下紅黏土厚度相差較大，鐵塔基礎易產生不均勻沉降，紅黏土收縮變形量與基底以下紅黏土厚度成正相關關繫。併對地基處理提齣瞭建議。
홍점토재운남성대부분지구엄범분포，곤명지구홍점토최전형적특정시실수후수축복침수팽창，불능회복도원위，이수축변형위주。유우곤명지구출현련속사년간한적겁단기후，증발량원대우강수량，도치대기영향심도화급극층심도불동정도적가심。본문이모송전선로N12호탑、N24호탑기출침강분석위례，통과현장감측화찬탐게로，이급대불동심도홍점토함수솔적측정，표명재2013년우계지전곤명지구적대기영향급극층심도대우7.00 m。분석홍점토재정상적기후상황하기실수량흔소，수축변형량야흔소，단수겁단간한기후영향，사득기출저면이하적홍점토함수량대폭강저，홍점토실수후수축변형，재대기영향급극층심도범위내，토암조합지기기출저면이하홍점토후도상차교대，철탑기출역산생불균균침강，홍점토수축변형량여기저이하홍점토후도성정상관관계。병대지기처리제출료건의。
The red clay is widely distributed in most parts of Yunnan Province. Typical characteristics of red clay in Kunming are the shrinkage after losing moisture, expansion after water soaking, not restoring and shrinkage deformation mostly important. Due to extreme climate of four consecutive years of drought in Kunming, evaporation is much greater than precipitation resulting deepening the atmosphere inlfuenced depth and the sharp layer depth. In the paper, ifrstly the foundation settlement analysis of transmission lines of the NO.12 wire tower and the NO.24 wire tower as an example, through ifeld surveying and drilling as well as measuring the moisture content different depth of red clay, it indicates the depth of the atmosphere inlfuenced and sharp layer in Kunming is more than 7m in 2013. Secondly, it analyses that the loss of moisture content and shrinkage deformation are small under normal climate conditions, as affected by extreme drought climate, which makes the moisture content of red clay under the foundation signiifcantly reduce and red clay’ shrinkage deformation. In the range of the depth of the atmosphere inlfuenced and sharp layer, the thickness of red clay under the foundation of soil-rock composite subgrade differ bigger, prone to cause uneven settlement of wire tower foundation, the level of shrinkage deformation depends on the thickness of red clay under the foundation and the two are proportional. Finally, the foundation treatment is proposed in the paper.
