饱水粘性土主固结理论

沈孝宇

饱水粘性土主固结理论

沈孝宇

深圳市勘察研究院,广东深圳 518026

详细信息

作者简介:
沈孝宇(1934—), 男, 教授, 主要从事土体固结理论和大面积软基处理研究

中图分类号: P642
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- 被引次数: 0
出版历程
- 收稿日期: 2004-02-28
- 刊出日期: 2005-07-25

Primary Consolidation Theory of Saturated Soft Clay

SHEN Xiao-yu

Shenzhen Survey Research Institute, Shenzhen 518026, China

摘要

摘要: 对饱水软粘土的预压排水主固结研究应从其排水的本质出发, 即从软土在预压过程的含水量变化上研究主固结量的变化规律, 利用土的基本性质指标导出主固结比基本公式及主固结量(沉降量)、绝对主固结量、绝对固结度等理论计算方法.与传统的算法不一样的地方是这些算法与预压荷载(即固结应力) 无关系, 直接计算出主固结的效果及评价预压排水固结地基处理卸载的可行性.利用上述基本公式亦可导出剩余主固结量、主固结速率等计算式.通过实例的分析, 证明上述理论方法与观测的数据基本相符.
- 软粘土 /
- 主固结比 /
- 绝对主固结量 /
- 堆载预压
Abstract: Study on primary consolidation of saturated soft clay under pre-loading drainage condition should be started with its drainage in nature, i.e., study the variation discipline of primary consolidation by its water content variation of soft clay through the pre-loading course, utilizing the basic property index of clay, then deduce the primary consolidation ration formula and get the theoretical calculation solution of primary consolidation (settlement), absolute primary consolidation, as well as absolute consolidation degree. The algorithmic difference compared with the traditional one is that this arithmetic is independent of pre-load (consolidation stress) and can calculate the primary consolidation effect and assess the unloading feasibility straightforwardly. It also can be draw the formula of residual primary consolidation and consolidation speed with above basic formula. By analysis with project examples, it was testified the theory was in accordance with principle with real data obtained by observation.
- soft clay /
- primary consolidation ration /
- absolute primary consolidation /
- pre-loading

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图 1 两相土的主固结物理模型

a.软土(两相体) 初始状态; b. t时间排水后主固结状态; 1.固结颗粒; 2.自由液态水; 3.结合水; 4.排出自由液态水后主固结体积

Fig. 1. Physical model of primary consolidation on two phases soil

下载: 全尺寸图片幻灯片

图 2 主固结比(η)、初始含水量(W₁) 和液限(W_l) 的关系

Fig. 2. Correlation curve of primary consolidation ratio (η)、initial moisture content (W₁) and liquid limit (W_l) 1.W_l=0.52;2.W_l=0.51;3.W_l=0.50;4.W_l=0.49;5.W_l=0.48

下载: 全尺寸图片幻灯片

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