<i><>K</i><sub>0</sub>应力状态膨胀土膨胀模型试验研究

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摘要以邯郸强膨胀土为研究对象，通过室内无荷膨胀率与有荷膨胀率试验，研究了膨胀土的膨胀率与压实度、初始含水率、上覆荷载之间的关系。由于在较小压力作用下其膨胀率相对无荷条件下而言急剧下降，难以用一个统一的公式来同时反映大荷载与小荷载（ <6.25 kPa ）下的膨胀率，通过初始含水率、压实度等因素分别建立了无荷膨胀率与有荷膨胀率（荷载 ≥6.25 kPa ）的计算公式， 0 ～ 6.25 kPa 的膨胀率可根据无荷膨胀率与 6.25 kPa 荷载下的膨胀率线性插值得到，从而建立了膨胀土 <> K ₀ 应力状态膨胀模型。该模型对不同膨胀等级的膨胀土均适用，具有推广价值。

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	黄斌
	何晓民
	谭凡

关键词 ：膨胀土, 膨胀模型, <> K ₀ 应力状态, 有荷膨胀率, 无荷膨胀率

Abstract：The relationships among the initial water content, compactness, cover load and expansion rate are studied through expansion experiments in the state of <>K₀ stress for Handan strong expansive soil. The expansion rate under small pressure is declined sharply relative to unloading. The expansion rates under small loading (<6.25 kPa) and large loading are difficult to be described by one equation. The formulae of no-load expansion rate and loaded expansion rate are established respectively based on the compactness and the initial water content. The expansion rate between 0~6.25 kPa can be calculated by linear interpolation according to the no-load expansion rate and that under the pressure of 6.25 kPa. Finally, an expansion model in the state of <>K₀ stress is established. This model is available to soil for different expensive classes and of promotional value.

Key words： expansive soil expansion model state of <>K₀ stress loaded expansion ratio no-load expansion ratio

收稿日期: 2011-04-26

TU431

基金资助:国家＂十一五＂科技支撑计划重点项目(2006BAB04A10)

作者简介: 黄斌 (1981 – ) ，男，江西丰城人，硕士，工程师，主要从事特殊土工程特性、土动力特性及地基处理等方面的研究。

引用本文:

黄斌, 何晓民, 谭凡. <>K₀应力状态膨胀土膨胀模型试验研究[J]. 岩土工程学报, 2011, 33(zk1): 442-447. HUANG Bin, HE Xiao-min, TAN Fan. Experimental study on expansion model of expansive soil in state of <>K ₀ stress. Chinese J. Geot. Eng., 2011, 33(zk1): 442-447.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/ 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2011/V33/Izk1/442

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