桥基岸坡土体剪切强度特性试验研究

王中豪; 周慧林

doi:10.11779/CJGE2023S10030

桥基岸坡土体剪切强度特性试验研究 English Version

王中豪^1,,
周慧林²

1.
长江科学院重庆分院, 重庆 400026
2.
长江岩土工程总公司(武汉), 湖北武汉 430010

详细信息

作者简介:
王中豪(1990—)，男，硕士，工程师，主要从事岩土工程试验及稳定性分析工作。E-mail: 779475836@qqq.com

中图分类号: TU43
计量
- 文章访问数: 119
- HTML全文浏览量: 20
- PDF下载量: 37
出版历程
- 收稿日期: 2023-07-04
- 网络出版日期: 2023-11-23
- 刊出日期: 2023-10-31

Shear strength characteristics of soils on bank slope of bridge foundation

WANG Zhonghao^1,,
ZHOU Huilin²

1.
Chongqing Branch of Yangtze River Scientific Research Institute, Chongqing 400026, China
2.
Changjiang Geotechnical Engineering Corporation, Wuhan 430010, China

摘要

摘要: 为研究对某桥基岸坡稳定性起重要影响的粉质黏土的剪切强度特性和力学参数，对原状土进行了不同含水状态下的大型原位直剪试验。试验结果表明：原状土的变形破坏模式呈蠕塑性破坏。饱和和天然状态下原状土的抗剪断峰值强度参数分别为 $\varphi$ =17.1°，c=22.1 kPa和 $\varphi$ =20.6°，c=29.3 kPa；饱和状态下土的剪切强度参数比天然状态下降低20%左右；试验结果为该桥基岸坡稳定性分析计算提供取值依据。
- 桥基岸坡 /
- 原状土 /
- 原位直剪试验 /
- 强度参数
Abstract: Aiming at the problem of foundation stability evaluation of a bridge in disease remediation, in order to study the shear strength characteristics and mechanical parameters of the undisturbed soil of silty clay which plays an important role in the stability of the bridge foundation, the large-scale in-situ direct shear tests on the undisturbed soil under different water contents are carried out. The results show that the deformation failure mode of the undisturbed soil is creep plastic failure. Its shear peak strength parameters in the saturateds state are as follows: $\varphi$ = 17.1 °, c = 22.1 kPa, and those in the natural state are that $\varphi$ = 20.6 °, c = 29.3 kPa. The strength parameters of the saturated soil are reduced by about 20% compared with those in the natural state. The test results may provide a basis for the stability analysis and calculation of the bank slope of the bridge foundation.
- bridge foundation slope /
- undisturbed soil /
- in-situ direct shear test /
- strength parameter

HTML全文

图 1 直剪试验原理示意图

Figure 1. Schematic diagram of direct shear tests

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图 2 试验场景照片

Figure 2. Photo of test scene

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饱和状态直剪试验 $\tau$ -u关系曲线

$\tau$ -u relationship curves of direct shear tests in saturated state

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天然状态直剪试验 $\tau$ -u关系曲线

$\tau$ -u relationship curves of direct shear tests in natural state

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直剪试验 $\tau$ - $\sigma$ 关系曲线

$\tau$ - $\sigma$ relationship curves of direct shear tests

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表 1 含水率与剪切强度参数结果对比

Table 1 Comparison of water content and shear strength parameters

试组编号	试验条件	含水率/%	剪切强度参数
试组编号	试验条件	含水率/%	f	$\varphi$ /(°)	c/kPa
${\tau _1}$ 组	原位，饱和	24.2	0.31	17.1	22.1
${\tau _2}$ 组	原位，天然	21.2	0.38	20.6	29.3

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