CN109653184A - 一种低盐盐渍土盐-冻胀力确定方法 - Google Patents

一种低盐盐渍土盐-冻胀力确定方法 Download PDF

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CN109653184A
CN109653184A CN201811333712.XA CN201811333712A CN109653184A CN 109653184 A CN109653184 A CN 109653184A CN 201811333712 A CN201811333712 A CN 201811333712A CN 109653184 A CN109653184 A CN 109653184A
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陈伟志
李安洪
吴沛沛
谢毅
胡会星
刘刚
张�林
张莎莎
李楚根
周成
曾永红
唐第甲
张敏
杨祥容
付铭川
李伯根
魏炜
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Abstract

一种低盐盐渍土盐‑冻胀力确定方法,以科学合理勘察确定盐渍土区域低盐盐渍土盐‑冻胀力,符合工程勘察需要。包括以下步骤:通过现场取样和室内土工试验,确定低盐盐渍土的天然含水量w、孔隙率n、泊松比υ、含盐量s和低盐盐渍土的抗压强度Ec;通过现场原位测试,确定低盐盐渍土在降温期间出现的最低温度T;确定低盐盐渍土的未冻含水比wu;通过下式计算确定低盐盐渍土盐‑冻胀力σe

Description

一种低盐盐渍土盐-冻胀力确定方法
技术领域
本发明涉及岩土工程技术领域,特别涉及一种低盐盐渍土盐-冻胀力 确定方法。
技术背景
盐渍土是指不同程度的盐碱化土体的统称,在全世界干旱、半干旱地 区及滨海区域广泛分布。盐渍土地基,特别是浅层盐渍土具有明显的盐- 冻胀变形特性,这种工程特性极易导致工程建构筑物隆起开裂,对高速铁 路而言,特别是高速无砟路基工程,盐渍土盐-冻胀力可能引发轨道不平 顺性加剧,威胁列车高速安全运营。低盐盐渍土是指含盐量较低的盐渍土, 其在低温条件下,冻胀力是引发低盐盐渍土盐-冻胀变形主要因素,而盐 胀力所起的作用则较小。
在低盐盐渍土区域开展高速铁路路基工程设计时,亟需勘察确定低盐 盐渍土地基的盐-冻胀力,以便采取有效工程措施,消除或减弱低盐盐渍 土地基的盐-冻胀变形。室内盐-冻胀试验确定盐渍土盐-冻胀力存在的弊端 在于试验耗时长、仪器要求高、试验工作量大,不利于工程推广应用,且 已有规范、文献、专利也极少提及低盐盐渍土盐-冻胀力的简易确定方法。
发明内容
本发明所要解决的技术问题是提供一种低盐盐渍土盐-冻胀力确定方 法,以科学合理勘察确定盐渍土区域低盐盐渍土盐-冻胀力,符合工程勘 察需要。
本发明解决上述技术所采用的技术方案如下:
本发明提出一种低盐盐渍土盐-冻胀力确定方法,包括以下步骤:
(1)通过现场取样和室内土工试验,确定低盐盐渍土的天然含水量 w、孔隙率n、泊松比υ及含盐量s;确定低盐盐渍土的抗压强度Ec,单位:kPa;
(2)通过现场原位测试,确定低盐盐渍土在降温期间出现的最低温 度T,单位:℃;
(3)通过以下公式确定低盐盐渍土的未冻含水比wu
wu=eMT (T≤Tf)
式中,wu为低盐盐渍土的未冻含水比;M为低盐盐渍土的孔隙分布特征 参数,单位:℃-1,取0.04~0.16℃-1;T为低盐盐渍土在降温期间出现的 最低温度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结 温度,单位:℃,取0℃;
(4)通过以下公式确定低盐盐渍土盐-冻胀力σe
式中,σe为低盐盐渍土盐-冻胀力,单位:kPa;n为低盐盐渍土孔隙率, 由步骤(1)确定;wu为低盐盐渍土的未冻含水比,由步骤(3)确定; Ec为低盐盐渍土抗压强度,单位:kPa,由步骤(1)确定;υ为低盐盐渍 土泊松比,由步骤(1)确定;T为低盐盐渍土在降温期间出现的最低温 度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结温度, 单位:℃,取0℃。
本发明的有益效果是,建立了一种低盐盐渍土盐-冻胀力确定方法, 能够有效克服室内试验确定低盐盐渍土盐-冻胀力存在的弊端,方便盐渍 土工程勘察,提升了低盐盐渍土盐-冻胀力确定速度;该方法实施流程清 晰、操作简易快捷、可操作性较强,符合工程勘察需要。
具体实施方式
下面通过实施例对本发明作进一步说明。
本发明的一种低盐盐渍土盐-冻胀力确定方法,包括以下步骤:
(1)通过现场取样和室内土工试验,确定低盐盐渍土的天然含水量 w、孔隙率n、泊松比υ及含盐量s;确定低盐盐渍土的抗压强度Ec,单位:kPa;
(2)通过现场原位测试,确定低盐盐渍土在降温期间出现的最低温 度T,单位:℃;
(3)通过以下公式确定低盐盐渍土的未冻含水比wu
wu=eMT (T≤Tf)
式中,wu为低盐盐渍土的未冻含水比;M为低盐盐渍土的孔隙分布特征 参数,单位:℃-1,取0.04~0.16℃-1;T为低盐盐渍土在降温期间出现的 最低温度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结 温度,单位:℃,取0℃;
(4)通过以下公式确定低盐盐渍土盐-冻胀力σe
式中,σe为低盐盐渍土盐-冻胀力,单位:kPa;n为低盐盐渍土孔隙率, 由步骤(1)确定;wu为低盐盐渍土的未冻含水比,由步骤(3)确定; Ec为低盐盐渍土抗压强度,单位:kPa,由步骤(1)确定;υ为低盐盐渍 土泊松比,由步骤(1)确定;T为低盐盐渍土在降温期间出现的最低温 度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结温度, 单位:℃,取0℃。
所述步骤(1)~(4)中,低盐盐渍土为s/ω<0.072的盐渍土。
所述步骤(3)~(4)中,低盐盐渍土的未冻含水比为盐渍土未冻含 水量与初始含水量的比值。
实施例:
某一高速铁路路基工程修建于盐渍土地基上,在铁路勘察期间,需确 定盐渍土地基不同深度的盐-冻胀力,现采用本发明方法予以确定。具体 步骤如下:
(1)通过现场取样和室内土工试验,确定低盐盐渍土的天然含水量 w、孔隙率n、泊松比υ及含盐量s,结果见表1;确定低盐盐渍土的抗压 强度Ec,单位:kPa,结果见表1。
由表1可知,s/ω=0.0625<0.072,故该盐渍土地基为低盐盐渍土。
(2)通过现场原位测试,确定低盐盐渍土在降温期间出现的最低温 度T,单位:℃,结果见表1。
(3)通过以下公式确定低盐盐渍土的未冻含水比wu
低盐盐渍土的未冻结含水量wu确定结果见表1,在确定过程中M取 0.05。
(4)通过以下公式确定低盐盐渍土盐-冻胀力σe
低盐盐渍土的盐-冻胀力σe计算过程及结果见表1。
表1低盐盐渍土盐-冻胀力计算过程
地基深度/m T<sub>f</sub>/℃ T/℃ s w n E<sub>c</sub>/kPa v w<sub>u</sub> σ<sub>e</sub>/kPa
0 0 -10 0.004 0.064 0.35 1600 0.35 0.61 116.9
0.5 0 -5 0.004 0.064 0.35 1600 0.35 0.79 65.7
1.5 0 -1 0.004 0.064 0.35 1600 0.35 0.95 14.5
2.5 0 4 0.004 0.064 0.35 1600 0.35 1 0
本发明提供的一种低盐盐渍土盐-冻胀力确定方法,适用于盐渍土区 域盐-冻胀力确定,为高速铁路或公路盐渍土路基及地基处理设计提供参 考依据,该方法实施流程清晰、操作简易快捷、可操作性较强,符合工程 勘察需要,具有广阔的推广应用前景。
以上所述只是说明本发明一种低盐盐渍土盐-冻胀力确定方法的一些 原理,并非是要将本发明局限在所示和所述的具体方法和适用范围内,故 凡是所有可能被利用的相应修改,均属于本发明所申请的专利范围。

Claims (3)

1.一种低盐盐渍土盐-冻胀力确定方法,包括以下步骤:
(1)通过现场取样和室内土工试验,确定低盐盐渍土的天然含水量w、孔隙率n、泊松比υ及含盐量s;确定低盐盐渍土的抗压强度Ec,单位:kPa;
(2)通过现场原位测试,确定低盐盐渍土在降温期间出现的最低温度T,单位:℃;
(3)通过以下公式确定低盐盐渍土的未冻含水比wu
wu=eMT(T≤Tf)
式中,wu为低盐盐渍土的未冻含水比;M为低盐盐渍土的孔隙分布特征参数,单位:℃-1,取0.04~0.16℃-1;T为低盐盐渍土在降温期间出现的最低温度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结温度,单位:℃,取0℃;
(4)通过以下公式确定低盐盐渍土盐-冻胀力σe
式中,σe为低盐盐渍土盐-冻胀力,单位:kPa;n为低盐盐渍土孔隙率,由步骤(1)确定;wu为低盐盐渍土的未冻含水比,由步骤(3)确定;Ec为低盐盐渍土抗压强度,单位:kPa,由步骤(1)确定;υ为低盐盐渍土泊松比,由步骤(1)确定;T为低盐盐渍土在降温期间出现的最低温度,单位:℃,由步骤(2)确定;Tf为常压下自由体积水的冻结温度,单位:℃,取0℃。
2.如权利要求1所述的一种低盐盐渍土盐-冻胀力确定方法,其特征在于:所述步骤(1)~(4)中,低盐盐渍土为s/ω<0.072的盐渍土。
3.如权利要求1所述的一种低盐盐渍土盐-冻胀力确定方法,其特征在于:所述步骤(3)~(4)中,低盐盐渍土的未冻含水比为盐渍土未冻含水量与初始含水量的比值。
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