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当前位置: 首页 > 文章 > 水系疏浚弃土改良为路基填料的试验研究 浙江大学学报(农业与生命科学版) 2005,31 (2)
Position: Home > Articles > Experimental study on transforming dredged silt from water systems into roadbase filling Journal of Zhejiang University (Agriculture and Life Sciences) 2005,31 (2)

水系疏浚弃土改良为路基填料的试验研究

作  者：
邵玉芳
单  位：
浙江大学生物系统工程系
关键词：
土壤固化剂;路基;水系;疏浚;试验
摘  要：
提出了一种将水系疏浚弃土改良后用于公路路基填筑的方法.对杭甬运河绍兴段开挖出的两种有代表性的弃土:粉土(土样a)和粉质粘土(土样b),掺入不同比例的土壤固化剂,制作成直径和高度均为5cm的试样,在规定的龄期进行无侧限抗压强度试验,以求证该方法的可行性和固化剂的最佳掺入量.结果表明,土壤固化剂对两种土样的加固效果均较显著,固化剂掺入量aw≥4%时,两种土样均已满足公路底基层填料的强度要求,aw≥10%时,固化土a可以做为公路基层填料.分析了两种固化土的应力-应变(σ-ε)曲线,当aw<2%时,固化土的σ-ε曲线与素土接近,呈加工硬化型,当aw≥2%时,σ-ε曲线呈加工软化型.固化剂使土样a的脆性减弱,可塑性增强,对土样b的作用正好相反.经现场试验证明该方法既经济又具有技术可行性.
译  名：
Experimental study on transforming dredged silt from water systems into roadbase filling
作  者：
SHAO Yu-fang (Dept. of Biosystems Engineering, Zhejiang University, Hangzhou 310029, China)
关键词：
soil stabilizer; roadbase; water systems; dredging; experiment
摘  要：
A method was presented to treat the dredged silt from water systems with soil stabilizer so that the soils became suitable for roadbase construction. Two soil samples, namely silt(soil a) and silty clay　(soil b) dredged from the Hangzhou-Ningbo Canal, with different stabilizer/soil ratios were first shaped into cylinders 5 cm in both diameter and height. Then unconfined compression tests were conducted to measure the strength increase of the stabilized soil and determine the optimal stabilizer/soil mixing ratio. Results showed that the confined compression strength (q_u) of both soil samples was effectively enhanced. When the mixing ratio a_w≥4%, both of the two stabilized-soils can be used as subbase filling of road, and when a_w≥10%, only stabilized soil a can be used as roadbase filling. So long as a_w<2%, the stress-strain (σ-ε) curves of the two stabilized soil samples were almost identical to that of the original soils, which were work hardening. As a_w≥2%, σ-ε curves of the two stabilized soils turned into work softening. The curves also revealed that the stabilizer was capable of reducing the brittleness and increasing the plasticity of soil a, with, however, an opposite effect on soil b. Through field tests, the method was proved to be economically and technically feasible.

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