基于极限抗剪强度改进的压实填方边坡稳定性评价方法研究

王振华; 邓辉; 张永军

doi:10.12401/j.nwg.2024046

基于极限抗剪强度改进的压实填方边坡稳定性评价方法研究

1.
甘肃省自然资源规划研究院，甘肃兰州　730000
2.
成都理工大学，地质灾害防治与地质环境保护国家重点实验室，四川成都　610059
3.
甘肃省地下水工程及地热资源重点实验室，甘肃兰州　730050

基金项目: 2020年度中央财政自然灾害防治体系建设项目“兰州市黄土斜坡变形破坏机理及风险管控措施研究”（甘资财发〔2020〕16号）资助成果

详细信息

作者简介:
王振华（1984−），男，高级工程师，长期从事工程地质、地质灾害防治研究。E−mail：956711249@qq.com

中图分类号: P55；TU4
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- HTML全文浏览量: 9
- PDF下载量: 37
出版历程
- 收稿日期: 2023-02-06
- 修回日期: 2024-04-10
- 录用日期: 2024-05-07
- 网络出版日期: 2024-05-21
- 刊出日期: 2024-08-19

Stability Evaluation Method and Protection Countermeasure of Compacted Fill Slope Based on Improvement of Ultimate Shear Strength

1.
Gansu Institute of Natural Resources Planning and Research, Lanzhou 730000, Gansu, China
2.
State Key Laboratory of GeologicalDisaster Prevention and Geological Environmental Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China
3.
Key Laboratory of Groundwater Engineering and Geothermal Resources in Gansu Province, Lanzhou 730050, Gansu, China

摘要

摘要:
压实度是影响填方边坡稳定性的重要因素，为了分析不同压实度下填方边坡的稳定性，设计了不同压实度下填方边坡工况，分析并建立了压实土体本构关系模型，基于有限元强度折减理论，分析了变形破坏趋势，确定极限抗剪强度。采用Bishop方法计算土条两侧的作用力，在不考虑土体侧向变形的情况下，计算得出边坡稳定性系数和填土外加应力作用下导致的沉降变形值，根据计算结果提出了填方边坡稳定性防护对策。结果表明：所提出的分析方法能够准确分析出填方边坡变形情况，有效降低了稳定性分析误差，并且将其应用于实际填方边坡稳定性分析中，具有实际应用意义。
- 压实度 /
- 填方边坡 /
- 稳定性 /
- 防护对策 /
- 抗剪强度 /
- 沉降变形
Abstract:
Compaction degree is an important factor affecting the stability of the fill slope. In order to analyze the stability of the fill slope under different compaction degree, the working conditions of the fill slope under different compaction degree were designed, and the constitutive relationship model of the compacted soil was analyzed and established. Based on the finite element strength reduction theory, the deformation and failure trend were analyzed and the ultimate shear strength was determined. Using the Bishop method to calculate the forces on both sides of the soil strip, without considering the lateral deformation of the soil, the stability coefficient of the slope and the settlement deformation value caused by the external stress of the fill soil were calculated. Based on the calculation results, stability protection measures for the fill slope were proposed. The results show that the proposed analysis method can accurately analyze the deformation of fill slopes, effectively reduce stability analysis errors, and apply it to the stability analysis of actual fill slopes, which has practical application significance.
- compaction /
- fill slope /
- stability /
- protection countermeasures /
- shear strength /
- settlement deformation

HTML全文

图 1 建设场地填方边坡工程地质平面图

Figure 1. Geological plan of construction site filling slope engineering

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图 2 场地填方边坡工程地质剖面图

Figure 2. Engineering geological profile of site fill slope section

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图 3 不同压实度下最大竖向沉降值对比

Figure 3. Comparison of maximum vertical settlement values under different compaction degrees

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图 4 不同压实度下填方边坡水平最大负位移值对比

Figure 4. Comparison of maximum horizontal negative displacement of fill slope under different compaction degrees

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图 5 不同压实度下填方边坡水平最大正位移对比

Figure 5. Comparison of maximum horizontal positive displacement of fill slope under different compaction degrees

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图 6 压实度80%黄土填方边坡

Figure 6. Loess fill slope with 80% compaction

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图 7 压实度90%黄土填方边坡

Figure 7. Loess fill slope with a compaction degree of 90%

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图 8 压实度95%黄土填方边坡

Figure 8. Loess fill slope with a compaction degree of 95%

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表 1 土层折减系数取值表

Table 1 Values of soil layer reduction coefficient

土层液化指数	液化土层深度（m）	折减系数
≤0.6	≤10	0
≤0.6	10～20	1/3
0.6～0.8	≤10	1/3
0.6～0.8	10～20	2/3
0.8～1.0	≤10	2/3
0.8～1.0	10～20	1.0

下载: 导出CSV

表 2 兰州市某建设场地填方边坡参数

Table 2 Filling slope parameters of a construction site in Lanzhou

序号	指标	参数
1	饱和渗透系数（m/h）	0.108
2	饱和含水率（%）	5.21
3	残余含水率（%）	0.084
4	土体粘结强度标准值（kPa）	45
5	暴雨入渗后内聚力（kPa）	26
6	暴雨入渗后内摩擦角（°）	25.3
7	暴雨入渗后容重（KN/m³）	17.6
8	天然容重（KN/m³）	13.5
9	土体底面倾角（°）	45
10	地下水反流线平均倾角（°）	32
11	填土高度（m）	0~120
12	条块滑动面的长度（m）	315

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