静力触探判别软土固结历史
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摘要
确定地基土的固结历史对计算其变形和强度特性有着重要的作用。以福建沿海地区软土为例,应用静力触探测试技术进行软土固结状态的判别。结果表明,正常固结软土其锥尖阻力与深度曲线的拟合直线延长线与坐标原点近似相交,超固结软土则与横轴(正轴)有一截距,欠固结软土则与横轴(负轴)有一截距。根据截距大小可进一步判别软土固结程度。利用静力触探技术判别软土固结历史能避免采取土样及室内土工试验对土样的扰动,结果能反映土体实际固结状态。研究结果对合理评价软土的特性、对软土地基的沉降变形计算具有理论及实际意义。
The consolidation state of soft soil is of significance for evaluation of deformation and strength of foundation soil. The consolidation state of soft soil in the coastal area of Fujian Province is differentiated by static cone sounding. For the normal consolidation state,the fitting beeline of static cone sounding of soft soil between cone resistance and test depth intersects the x-coordinate at the origin approximately;for the overconsolidation state,intersects the positive x coordinate;and for the underconsolidation state,intersects the negative x coordinate. The consolidation state of soft soil can be differentiated by the intercept of the line. The consolidation state of soft soil,tested by in-situ static cone sounding,fits the actual condition of soft soil;and the method can be used for the evaluation of the consolidation state of soft soil.
The consolidation state of soft soil is of significance for evaluation of deformation and strength of foundation soil. The consolidation state of soft soil in the coastal area of Fujian Province is differentiated by static cone sounding. For the normal consolidation state,the fitting beeline of static cone sounding of soft soil between cone resistance and test depth intersects the x-coordinate at the origin approximately;for the overconsolidation state,intersects the positive x coordinate;and for the underconsolidation state,intersects the negative x coordinate. The consolidation state of soft soil can be differentiated by the intercept of the line. The consolidation state of soft soil,tested by in-situ static cone sounding,fits the actual condition of soft soil;and the method can be used for the evaluation of the consolidation state of soft soil.
引文
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[3]孔德金.软粘土前期固结压力及其应用[J].中国港湾建设,2000,(4):36–38.(Kong Dejin.Preconsolidation pressure of soft clay and its application[J].China Harbour Engineering,2000,(4):36–38.(in Chinese))
[4]Chiu T F,Chang C T.Ground settlement and building protection for soft ground tunneling[A].In:Liu Guobin ed.Proceedings of the Regional Conference on Geotechnacal Aspects of Underground Construction in Soft Ground[C].Shanghai:Tongji University Press,2001.48–53.
[5]孟高头.土体原位测试机理方法及其工程应用[M].北京:地质出版社,1997.(Meng Gaotou.Theory,Method and Its Engineering Application of Soil Test in Situ[M].Beijing:Geological Publishing House,1997.(in Chinese))
[6]河海大学.交通土建软土地基工程手册[M].北京:人民交通出版社,2001.(Hohai University.A Manual for Transportation and Civil Engineering in Soft Soil Ground[M].Beijing:China Communications Press,2001.(in Chinese))
[7]白冰,肖宏彬.软土工程若干理论与应用[M].北京:中国水利水电出版社,2002.(Bai Bing,Xiao Hongbin.Some Theories and Engineering Applications of Soft Soil[M].Beijing:China Water Power Press,2002.(in Chinese))
[8]王晓谋,袁怀宇.高等级公路软土地基路堤设计与施工技术[M].北京:人民交通出版社,2001.(Wang Xiaomou,Yuan Huaiyu.Design and Construction Technology for Embankment of Superhighway in Soft Soil Ground[M].Beijing:China Communications Press,2001.(in Chinese))
[9]祝龙根,刘利民,耿乃兴.地基基础测试新技术[M].北京:机械工业出版社,1999.(Zhu Longgen,Liu Limin,Geng Naixing.New Testing Technology for Foundation[M].Beijing:China Machine Press,1999.(in Chinese))
[10]欧秉松,雷土成.闽东南沿海地区淤泥土的地震工程地质特征[J].台湾海峡,2000,19(2):125–131.(Ou Bingsong,Lei Tucheng.Seismic engineering geological features of muddy soil in coastal region of Southeast Fujian[J].Journal of Oceanography in Taiwan Strait,2000,19(2):125–131.(in Chinese))
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