砂质黏性紫色土渗透特性试验研究

doi:10.11779/CJGE2018S2044

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摘要土的渗透特性反映土体透水能力,是土壤水蚀模型的重要参数和评估水土流失效应的重要指标。利用多功能三轴仪对重庆地区典型砂质黏性紫色土进行模拟自然界下不同降雨强度和不同覆土深度处的渗透试验,分别研究了渗透压、围压及覆土压力等因素对土体渗透特性的影响规律。结果表明：试验范围内的不同渗透压下砂质黏性紫色土的渗透系数处于相同数量级;围压对土体的渗透系数有显著的影响,但随着围压逐渐增大,土体渗水能力的降低梯度逐渐减小;覆土压力增加,土体的渗透系数减少,相同状态下围压越小,覆土压力对土体渗透系数的影响效果越明显;随着覆土深度的增加,砂质黏性紫色土的渗透系数迅速降低。研究可为地基处理、滑坡机理分析及水土流失防治设计等提供参考。

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	梁广川
	汪时机
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	沈泰宇
	何丙辉

关键词 ：砂质黏性紫色土, 渗透特性, 渗透压, 覆土压力, 三轴渗透试验

Abstract：The permeability characteristic of soils reflects their permeable capability, and it is an important parameter of water erosion models and used to asses the effect of soil erosion as an important index. The tests on the permeability of the typical sandy clayey purple soils in Chongqing area are performed by the multifunction triaxial apparatus different rainfall intensities and soil-covering depths in nature, and the influence laws of seepage pressure, confining pressure and geostatic stress on the permeability characteristics of soils are studied. The results show that the permeability coefficient of sandy clayey purple soils under different seepage pressures have the same order of magnitude. The confining pressure has a significant effect on the permeability coefficient of the soils, but as the confining pressure gradually increases, the decreasing gradient of permeability coefficient of soils gradually decreases. With the increase of geostatic stress, the permeability coefficient of soils decreases. The smaller the confining pressure, the more obvious the effect of geostatic stress. With the increase of soil-covering depth, the permeability coefficient of sandy clayey purple soils decreases rapidly. This research may provide reference for treatment of foundation, analysis of landslide mechanism, design of soil erosion control and so on.

Key words： sandy clayey purple soil permeability seepage pressure geostatic stress triaxial permeability test

收稿日期: 2018-07-23

ZTFLH:

TU411

基金资助:国家自然科学基金项目（11572262，41771312）；中央高校基本业务费专项资金项目（XDJK2018AB003）

通讯作者: *（E-mail: shjwang@swu.edu.cn）

作者简介: 梁广川(1994– )，男，四川广安人，主要从事岩土力学方面的研究。E-mail：halgc1994@foxmail.com。

引用本文:

梁广川, 汪时机, 李贤, 毛新, 沈泰宇, 何丙辉. 砂质黏性紫色土渗透特性试验研究[J]. 岩土工程学报, 2018, 40(S2): 220-224. LIANG Guang-chuan, WANG Shi-ji, LI Xian, MAO Xin, SHEN Tai-yu, HE Bing-hui. Experimental study on permeability characteristics of sandy clayey purple soil. Chinese J. Geot. Eng., 2018, 40(S2): 220-224.

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http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/10.11779/CJGE2018S2044 或 http://manu31.magtech.com.cn/Jwk_ytgcxb/CN/Y2018/V40/IS2/220

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