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(1 建筑安全與環(huán)境國家重點實驗室, 北京 100013; 2 國家建筑工程技術(shù)研究中心, 北京 100013;3 中國建筑科學(xué)研究院有限公司地基基礎(chǔ)研究所, 北京 100013)
摘要: 某核電站核島廠房位于深厚的第四系覆蓋土層,初步設(shè)計采用樁筏基礎(chǔ)方案,現(xiàn)場已開展原狀土地基和經(jīng)振沖碎石樁處理后地基的樁基礎(chǔ)原位試驗工作. 通過對試驗數(shù)據(jù)的分析可知,地基處理后樁間土達(dá)到密實狀態(tài),完全消除了地基液化隱患,單樁及群樁水平承載力特征值相對處理前分別提高了 60%和 45%,地基處理效果顯著.由于振沖碎石樁對軟弱樁間土的振密效果有限,現(xiàn)場樁基載荷試驗得到的單樁水平承載力特征值未能達(dá)到設(shè)計要求. 通過對多種地基處理方案的綜合分析,推薦采用直徑 600mm、間距 1. 0m 的振沖碎石樁方案結(jié)合增加基礎(chǔ)埋深措施,或者采用對地基土加固效果更好的滿堂咬合布置的水泥攪拌樁方案,并給出地基處理范圍及深度.
關(guān)鍵詞: 核島廠房; 地基處理; 振沖碎石樁; 水泥攪拌樁; 水平承載力
中圖分類號:TU472 文獻(xiàn)標(biāo)志碼:A 文章編號:1002?848X(2022)08?0135?05
DOI:10. 19701 / j.jzjg.LS201816
Analysis of the ground treatment scheme for the nuclear island plant of a nuclear power station
SUN Wei1,2,3, ZHAO Xiaoguang1,2,3, GAO Wensheng1,2,3, QIU Rendong1,2,3
(1 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 2 National EngineeringResearch Center of Building Technology, Beijing 100013, China; 3 Institute of Foundation Engineering of ChinaAcademy of Building Research, Beijing 100013, China)
Abstract: The nuclear island plant of a nuclear power station is based on a thick quaternary overburden soil layer. Pile?raftfoundation was adopted in the preliminary design. In?situ test of pile foundation was carried out both on the undisturbedground and the ground treated by vibro?replacement stone columns. Study on the test data shows that the soil between pileshas 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% respectivelycompared with that before ground treatment, which shows that the ground treatment effect is significant. Due to the limitedcompaction effect of vibro?replacement stone columns on soft soil between piles, the characteristic value of the horizontalbearing capacity of single pile obtained from the field static load test fails to meet the design requirement. Two groundtreatment schemes are recommended through the comprehensive analysis of a variety of ground treatment schemes. The firstone is the vibro?replacement stone column scheme with a diameter of 600mm and a spacing of 1. 0m in combination withmeasure 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; horizontalbearing capacity
第一作者:孫威,博士,工程師,主要從事地基處理及基坑工程的設(shè)計咨詢與研究工作,Email: sunweicabr@ 163.com.
[引用本文] 孫威,趙曉光,高文生,等. 某核電站核島廠房地基處理方案分析[ J]. 建筑結(jié)構(gòu),2022,52(8):135?139,79. SUN Wei, ZHAO Xiaoguang, GAO Wensheng, et al. Analysis of the ground treatment scheme for the nuclearisland plant of a nuclear power station[J]. Building Structure,2022,52(8):35?139,79.
