某核电站核岛厂房地基处理方案分析

引用文献：

孙威赵晓光高文生秋仁东. 某核电站核岛厂房地基处理方案分析[J]. 建筑结构，2022，48（08）：135-139，79.

SUN Wei ZHAO Xiaoguang GAO Wensheng QIU Rendong. Analysis of the ground treatment scheme for the nuclear island plant of a nuclear power station[J]. Building Structure，2022,48（08）：135-139，79.

作者：孙威赵晓光高文生秋仁东

单位：建筑安全与环境国家重点实验室国家建筑工程技术研究中心中国建筑科学研究院有限公司地基基础研究所

摘要：某核电站核岛厂房位于深厚的第四系覆盖土层，初步设计采用桩筏基础方案，现场已开展原状土地基和经振冲碎石桩处理后地基的桩基础原位试验工作。通过对试验数据的分析可知，地基处理后桩间土达到密实状态，完全消除了地基液化隐患，单桩及群桩水平承载力特征值相对处理前分别提高了60%和45%,地基处理效果显著。由于振冲碎石桩对软弱桩间土的振密效果有限，现场桩基载荷试验得到的单桩水平承载力特征值未能达到设计要求。通过对多种地基处理方案的综合分析，推荐采用直径600mm、间距1.0m的振冲碎石桩方案结合增加基础埋深措施，或者采用对地基土加固效果更好的满堂咬合布置的水泥搅拌桩方案，并给出地基处理范围及深度。

关键词：核岛厂房，地基处理，振冲碎石桩，水泥搅拌桩，水平承载力

作者简介：孙威，博士，工程师，主要从事地基处理及基坑工程的设计咨询与研究工作，Email:sunweicabr@163.com。

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参考文献[1] 崔成龙，刘聚奎.核电站软土地基基础的处理问题[J].核动力工程，1984,5(3):38-46.
[2] 建筑抗震设计规范：GB 50011—2010[S].2016年版.北京：中国建筑工业出版社，2016.
[3] 核电厂抗震设计规范：GB 50267—97[S].北京：中国计划出版社，1998.
[4] 岩土工程勘察规范：GB 50021—2001[S].2009年版.北京：中国建筑工业出版社，2009.
[5] 建筑桩基技术规范：JGJ 94—2008[S].北京：中国建筑工业出版社，2008.
[6] 建筑基坑支护技术规程：JGJ 120—2012[S].北京：中国建筑工业出版社，2012.
[7] 阮波，彭学先，邓林飞.水泥土抗剪强度参数试验研究[J].铁道科学与工程学报，2016,13(4):662-668.
[8] 高亚成，郑建青.水泥土的室内试验研究[J].河海大学学报，1999,27(5):103-106.
[9] 曹云，徐奋强.水泥土无侧限抗压强度室内试验研究与分析[J].材料与装备，2009,12(9):76-79.
[10] 建筑地基处理技术规范：JGJ 79—2012[S].北京：中国建筑工业出版社，2012.

Analysis of the ground treatment scheme for the nuclear island plant of a nuclear power station

SUN Wei ZHAO Xiaoguang GAO Wensheng QIU Rendong

(State Key Laboratory of Building Safety and Built Environment National Engineering Research Center of Building Technology Institute of Foundation Engineering of China Academy of Building Research)

Abstract: The nuclear island plant of a nuclear power station is based on a thick quaternary overburden soil layer. Pile-raft foundation was adopted in the preliminary design. In-situ test of pile foundation was carried out both on the undisturbed ground and the ground treated by vibro-replacement stone columns. Study on the test data shows that the soil between piles has reached a dense state and the liquefaction of the ground has been eliminated completely after ground treatment. Horizontal bearing capacity characteristic value of single pile and pile group has increased by 60% and 45% respectively compared with that before ground treatment, which shows that the ground treatment effect is significant. Due to the limited compaction effect of vibro-replacement stone columns on soft soil between piles, the characteristic value of the horizontal bearing capacity of single pile obtained from the field static load test fails to meet the design requirement. Two ground treatment schemes are recommended through the comprehensive analysis of a variety of ground treatment schemes. The first one is the vibro-replacement stone column scheme with a diameter of 600 mm and a spacing of 1.0 m in combination with measure of increasing the buried depth of foundation. The second one is the cement mixing pile scheme with 100% replacement rate, which has good effect on ground improvement. The range and depth of the ground treatment were given.

Keywords: nuclear island plant; ground treatment; vibro-replacement stone column; cement mixing pile; horizontal bearing capacity

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