11软弱土地基处理.ppt

第十一章软弱土地基处理软弱土地基处理 Ground Treatment of Soft Soils Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 11 软弱土地基处理 概述 换土垫层法 强夯法 挤密法和振冲法 水泥土搅拌法 排水固结法 土工合成材料本章目录 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 11 软弱土地基处理 概述浅基础,当承载力、沉降、液化、冻胀等不满足设计要求时(1) 采用深基础、桩基础(2) 地基处理,改善土性 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 11 软弱土地基处理?地基处理的目的 1 提高土的强度---地基承载力 2 增加土的刚度---减少地基沉降量 3 改善地基土的水力特性(1) 防渗: 堤坝、闸基、池 (2) 排水: 软基固结渗流、挡土墙排水 (3) 渗透稳定性: 长江大堤的管涌、流土(采用反滤) (4) 抗冻性 4 改善抗震性能(1) 液化: 加密 (2) 震陷: 干松砂和溶洞 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 11 软弱土地基处理?地基处理的对象?软弱地基?不良地基淤泥土 e> ,?>? L (I L >) 淤泥质土 e=~ ,?>? L (I L >) 泥炭土,泥炭质土冲填土湿陷性黄土膨胀土冻土松砂 Dr < 1/3 或 e > 饱和液化,干土震陷人工填土,杂填土 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 11 软弱土地基处理?地基处理的方法排水固结法振密及挤密法加筋及托换法置换及拌入法方法众多, 分类不统一强夯法换土填层法化学加固法 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyrig