高速铁路技术
高速鐵路技術
고속철로기술
HIGH SPEED RAILWAY TECHNOLOGY
2013年
6期
37-40
,共4页
客运专线铁路%软土%孤石%地基加固%钻孔灌注桩
客運專線鐵路%軟土%孤石%地基加固%鑽孔灌註樁
객운전선철로%연토%고석%지기가고%찬공관주장
passenger dedicated railway%soft soil%boulder%foundation stabilization%cast-in-place pile
路基遇孤石大范围随机分布于深厚软土的情况较为特殊，相关方面的设计借鉴经验也很少。无砟轨道客运专线对路基的沉降及稳定要求较高，更需引起重视。软土中的孤石分布零散、规律性不强、大小形状不一，在路基地质勘察时，往往难以发现。采用CFG桩、水泥搅拌桩等复合地基处理措施进行加固，这些孤石岩质坚硬，难以穿过，容易误判为桩端持力层。施工过程中应该严格控制，认真核对施工揭示地质与设计是否一致，有异常现场应及时分析原因。对可能大范围存在孤石的情况，应采用增设地质验证钻孔、地表探坑、收集施工桩基资料进行综合分析，查清孤石分布情况。文章结合西南地区客运专线铁路工程建设实例，介绍软土夹孤石地基加固处理分析方法，提出了原位增设钻孔灌注桩等处理方法。
路基遇孤石大範圍隨機分佈于深厚軟土的情況較為特殊，相關方麵的設計藉鑒經驗也很少。無砟軌道客運專線對路基的沉降及穩定要求較高，更需引起重視。軟土中的孤石分佈零散、規律性不彊、大小形狀不一，在路基地質勘察時，往往難以髮現。採用CFG樁、水泥攪拌樁等複閤地基處理措施進行加固，這些孤石巖質堅硬，難以穿過，容易誤判為樁耑持力層。施工過程中應該嚴格控製，認真覈對施工揭示地質與設計是否一緻，有異常現場應及時分析原因。對可能大範圍存在孤石的情況，應採用增設地質驗證鑽孔、地錶探坑、收集施工樁基資料進行綜閤分析，查清孤石分佈情況。文章結閤西南地區客運專線鐵路工程建設實例，介紹軟土夾孤石地基加固處理分析方法，提齣瞭原位增設鑽孔灌註樁等處理方法。
로기우고석대범위수궤분포우심후연토적정황교위특수，상관방면적설계차감경험야흔소。무사궤도객운전선대로기적침강급은정요구교고，경수인기중시。연토중적고석분포령산、규률성불강、대소형상불일，재로기지질감찰시，왕왕난이발현。채용CFG장、수니교반장등복합지기처리조시진행가고，저사고석암질견경，난이천과，용역오판위장단지력층。시공과정중응해엄격공제，인진핵대시공게시지질여설계시부일치，유이상현장응급시분석원인。대가능대범위존재고석적정황，응채용증설지질험증찬공、지표탐갱、수집시공장기자료진행종합분석，사청고석분포정황。문장결합서남지구객운전선철로공정건설실례，개소연토협고석지기가고처리분석방법，제출료원위증설찬공관주장등처리방법。
The situation of large amount of boulders randomly distributed in larger area of deep soft soil in subgrade is more specific,besides,relevant design experience can be used for reference is insufficient.It should pay more attention on the higher requirement on subgrade settlement and stability of non-ballasted track Passenger Dedicated Railway.The boulders are scattered in soft soil,with low regularity and in different size and shape,which is difficult to fully ascertain the conditions of boulder in geological survey.The CFG pile (i.e.cement-flyash-gravel pile),cement-mixed pile and other composite foundation measures are taken to reinforce foundation.Due to these boulders are hard and difficult to penetrate ,it is mistakenly assume that this layer is bearing stratum at pile end.In construction process,it should strictly control and carefully check whether the actual geological condition is consistent with design drawing,and make analysis on the abnormalities occurring in construction site promptly.Taking additional geological verification drilling and surface trial pits to collect data,making a comprehensive analysis of construction pile,and figure out the actual distribution of boulders,especially in the area where large amount of boulders is distributed are methods adopted.Based on the con-struction of passenger dedicated railway projects in southwest China,this paper introduces the consolidation method of soft soil surrounding boulders in subgrade foundation,and put forwards the treatment method of in-situ bored pile.
