DB43/T 2956-2024 红层软岩路基设计与施工技术规程

ICS93.080.10

CCSP66

43

湖南省地方标准

DB43/T2956—2024

红层软岩路基设计与施工技术规程

Technicalspecificationfordesignandconstruction

ofredbedssoftrocksubgrade

2024-05-13发布2024-07-13实施

湖南省市场监督管理局发布

DB43/T2956—2024

目次

前言························································································································Ⅲ

1范围·····················································································································1

2规范性引用文件······································································································1

3术语和定义············································································································1

4符号和缩略语·········································································································2

4.1符号···············································································································2

4.2缩略语············································································································2

5试验·····················································································································2

5.1一般规定·········································································································2

5.2取样···············································································································3

5.3试验项目与方法································································································3

6勘察·····················································································································5

6.1一般规定·········································································································5

6.2填方路基勘察要点·····························································································5

6.3挖方路基勘察要点·····························································································6

7边坡稳定性分析与计算·····························································································6

7.1一般规定·········································································································6

7.2稳定性分析与计算·····························································································6

8设计·····················································································································7

8.1一般规定·········································································································7

8.2填方路基·········································································································8

8.3挖方路基·········································································································9

8.4其他路基·········································································································9

8.5路基排水·······································································································11

9施工···················································································································12

9.1一般规定·······································································································12

9.2填方路基·······································································································12

9.3挖方路基·······································································································14

10检测与监测·········································································································14

10.1一般规定·····································································································14

10.2施工过程质量检测·························································································14

10.3交工质量检测·······························································································15

10.4路基监测·····································································································15

I

DB43/T2956—2024

附录A（规范性）红层软岩室内浸水崩解试验·······························································17

附录B（资料性）湖南省红层软岩分布图·····································································18

附录C（资料性）边坡失稳模式判别···········································································19

附录D（资料性）边坡稳定性刚体极限平衡计算方法······················································20

II

DB43/T2956—2024

前言

本文件按照GB/T1.1—2020《标准化工作导则第1部分：标准化文件的结构和起草规则》的规

定起草。

请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别专利的责任。

本文件由湖南省交通运输厅提出并归口。

本文件起草单位：湖南省交通规划勘察设计院有限公司、湖南大学、湖南省交通科学研究院有限公

司、湖南路桥建设集团有限责任公司、湖南省高速公路建设集团有限公司、中南大学、湖南省通泰工程

有限公司、湖南城市学院。

本文件的主要起草人：胡惠华、肖燕、刘晓明、李志勇、吴典文、张泽丰、周栋梁、陈昌富、赵炼

恒、胡新红、张鹏、巢万里、马德青、鲁光银、张超、刘曙光、陈国平、邓东平、龚道平、段少华、刘

新奇、葛延明、骆伟、邬远明、张根宝、胡玉华、舒魏碧章、陈鑫、李静、刘文劼、刘军、王泗。

III

DB43/T2956—2024

IV

DB43/T2956—2024

红层软岩路基设计与施工技术规程

1范围

本文件规定了红层软岩路基的勘察、设计与施工等技术要求。

本文件适用于各等级公路新建和改扩建工程。城市道路与林区、厂矿等专用道路可参考使用。

2规范性引用文件

下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，

仅该日期对应的版本适用于本文件；不注日期的引用文件，其最新版本（包括所有的修改单）适用于本

文件。

JTG/T3334公路滑坡防治设计规范

JTG3430公路土工试验规程

JTG/T3610公路路基施工技术规范

JTGC20公路工程地质勘察规范

JTGD30公路路基设计规范

JTG/TD32公路土工合成材料应用技术规范

JTG/TD33公路排水设计规范

JTGE41公路工程岩石试验规程

JTGF80/1公路工程质量检验评定标准

3术语和定义

JTGC20、JTGD30界定的以及下列术语和定义适用于本文件。

3.1

红层软岩redbedssoftrock

泛指中生界三叠系、侏罗系、白垩系及新生界古近系和新近系的沉积地层，岩性为泥岩、泥质粉砂

岩、钙泥质粉砂岩及其组合等，以红色、砖红色为显著特征的软质岩。

3.2

预崩解处理Pre-disintegration

在用作路堤填料之前，将爆破或开挖出来的天然红层软岩裸露于大气、阳光和雨水中，通过自然或

人工的手段使其崩解的处理过程。

3.3

崩解料Disintegratedembankmentmateria

红层软岩经预崩解处理，消除其水活性，变成一种低液限粉质黏土或粉土，可用来作为路堤填筑的

填料。

3.4

碾压密实型红层软岩路堤Rollercompactedredbedssoftrockembankment

1

DB43/T2956—2024

将红层软岩崩解料按合理的松铺厚度分层摊铺、耙压与破碎、碾压密实而形成的路堤。

3.5

断面封闭型红层软岩路堤Closedsectionredbedssoftrockembankment

又称包边路堤，即路堤中部用红层软岩崩解料填筑，坡面和顶面采用一定厚度低液限黏土封闭的红

层软岩路堤。

3.6

成层碾压型红层软岩路堤Layeredrolledredbedssoftrockembankment

将红层软岩崩解料与低液限黏土按水平互层填筑的路堤。

3.7

掺灰改良型红层软岩路堤Ashmixedredbedssoftrockembankment

在红层软岩崩解料中掺入一定比例的粉末状熟石灰，分层填筑、压实形成的路堤。

3.8

复合型红层软岩边坡Compositeredbedssoftrockslope

在红层软岩斜坡上开挖或填筑的人工边坡与自然边坡形成的复合型边坡。

4符号和缩略语

下列符号和缩略语适用于本文件。

4.1符号

K——压实度（％）。

w——含水率（％）。

w——液限（％）。

L

w——塑限（％）。

P

——干密度（g/cm3）。

d

3

dmax——最大干密度（g/cm）。

d——填料颗粒比重（无量纲）。

s

n——孔隙率（无量纲）。

-1

a——压缩系数（MPa）。

c——黏聚力（kPa）。

——内摩擦角（°）。

R——单轴抗压强度（MPa）。

c

4.2缩略语

CBR——加州承载比（Californiabearingratio）。

5试验

5.1一般规定

5.1.1红层软岩按耐崩解性应划分为三类，应在野外识别基础上，按附录A要求进行红层软岩岩块的

室内浸水崩解试验，并根据24小时崩解情况按表1进行分类。

2

DB43/T2956—2024

表1红层软岩耐崩解性分类

浸水崩解试验

红层软岩分类野外识别

烘干浸水24小时崩解情况

一类崩解为泥状、渣状、颗粒状泥岩、泥质胶结砂岩

二类崩解为块状钙、泥质胶结砂岩

三类未崩解钙质胶结砂岩

5.1.2初判具有膨胀性的红层软岩，应按JTG3430规定方法测试其膨胀性指标。

5.2取样

5.2.1用作路基填料的红层软岩，应在料场的不同部位取新鲜岩样，并做密封处理，且数量不少于6

组。

5.2.2用作路基填料的红层软岩以及与红层软岩路基相关的各类黏性土均应符合本文件5.3.3的试验

要求。

5.2.3红层软岩和路基填料取样及试验的其他事项应符合JTGE41和JTG3430的规定。

5.3试验项目与方法

5.3.1挖方路基边坡室内测试项目应按表2选择。

表2挖方路基边坡室内测试项目

岩土类别

测试项目试验方法

粉土、黏性土砂土碎石土一类岩二类岩三类岩

JTG3430

颗粒分析（+）++

T0115-T0117

JTG3430

天然含水率w+（+）（+）（+）（+）（+）

T0103-T0104

JTG3430

天然密度+（+）（+）（+）（+）（+）

T0109-T0111

塑限w

p+JTG3430

液限T0118

wL+

剪切黏聚力cJTG3430

+（+）（+）（+）（+）

试验内摩擦角T0140-T0142

饱和单轴抗压强度+

RcJTGE41

天然单轴抗压强度T0221

Rc++

注：“+”为必做项目；“（+）”为选做项目；

5.3.2填方路基边坡室内测试项目应按表3选择。

3

DB43/T2956—2024

表3填方路基边坡室内测试项目

岩土类别

测试项目试验方法

粉土、黏性土砂土碎石土一类岩二类岩三类岩

JTG3430

颗粒分析（+）++

T0115-T0117

JTG3430

天然含水率w+（+）（+）（+）（+）（+）

T0103-T0104

JTG3430

天然密度+（+）（+）（+）（+）（+）

T0109-T0111

塑限w

p+JTG3430

液限T0118

wL+

压缩系数a+JTG3430T0177

剪切黏聚力cJTG3430

+（+）（+）（+）（+）（+）

试验内摩擦角T0140-T0142

注：“+”为必做项目；“（+）”为选做项目。

5.3.3红层软岩崩解料室内试验项目应按表4选择。

表4红层软岩崩解料室内试验项目

岩土类别

测试项目试验方法

一类岩二类岩各类黏性土

天然密度+++JTG3430T0109-T0111

颗粒比重ds+++JTG3430T0112-T0114

天然含水率w+++JTG3430T0103-T0104

单轴抗压强度

Rc++JTGE41T0221

自由膨胀率+++JTG3430T0124

干燥饱和吸水率++（+）JTGE41T0205

浸水崩解试验++（+）附录A

塑限wp++

JTG3430T0118

液限

wL

颗粒分析+++JTG3430T0115-T0117

饱水强度++JTGE41T0221

软化系数++

4

DB43/T2956—2024

表4红层软岩崩解料室内试验项目（续）

岩土类别

测试项目试验方法

一类岩二类岩各类黏性土

击实试验+++JTG3430T0131

压缩试验++JTG3430T0135-T0136

剪切黏聚力c

+++JTG3430T0140-T0142

试验内摩擦角

承载比（CBR）试验+++JTG3430T0134

渗透试验+++JTG3430T0129-T0130

注：1.“+”为必做项目，“（+）”为选做项目；

2.最大干密度与最佳含水率应采用湿法重型击实试验确定。

6勘察

6.1一般规定

6.1.1红层软岩路基勘察应按照工程建设各