土工格室在铁路软弱基床加固中的应用

杨晓华; 戴铁丁; 许新桩

土工格室在铁路软弱基床加固中的应用

1.
长安大学公路学院, 陕西西安 710064
2.
长安大学公路学院, 陕西西安 710054

基金项目:

国家西部交通建设科技项目 2001 318 812 59

详细信息

作者简介:
杨晓华(1961-), 男, 河北唐山人, 长安大学教授, 博士研究生, 从事岩土与隧道工程研究

中图分类号: U213.1
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- 被引次数: 0
出版历程
- 收稿日期: 2004-09-02
- 刊出日期: 2005-06-25

Geocell application in reinforcing soft subgrade of railway

1.
School of Highway, Chang'an University, Xi'an 710064, China
2.
Xi'an Railway Technology Institude of Zhengzhou Railway Bureau, Xi'an 710054, China

More Information

Author Bio:
Yang Xiao-hua(1961-), male, professor, 86-29-82334445, xiaohuay@126.com

摘要

摘要: 为有效加固铁路软弱基床, 保证列车安全运营, 运用Marc软件对土工格室加固基床的工程性状开展了有限元分析, 分别选择34cm×10cm、40cm×10cm、34cm×15cm和40cm×15cm(焊距×高度)4种规格的土工格室, 应用平板载荷试验方法进行了土工格室加固的软弱基床承载力足尺模型试验, 同时采用土工格室加固方法, 对阳安铁路K241+450~550段的软弱基床进行了处治。结果表明土工格室可有效约束软弱基床的侧向位移和扩散应力, 最大侧向位移可减少17%, 最大竖向应力减少9.3%, 且使应力分布更加均匀; 加固后的基床承载力达180kPa以上, 降低加固费用6%~12%;加固地段6a累计最大沉降为28mm, 最小沉降为13mm, 达到了加固铁路软弱基床的目的。
- 铁道工程 /
- 土工格室 /
- 模型试验 /
- 有限元分析 /
- 软弱基床加固
Abstract: In order to reinforce the soft subgrade of railway effectually, guarantee train safety, the engineering mechanism of railway subgrade reinforced by geocell was analyzed by using Marc program, a full-scale load-bearing test of soft subgrade reinforced by 4 types of geocells was carried out, by using flat load-test method. The different types of geocells are 34 cm×10 cm, (40 cm)×10 cm, 34 cm×15 cm and 40 cm×15 cm. The subgrade disease in the site of K241+(450~)550 of Yang'an railway was treated by using geocell. The result shows that geocell can restrict the lateral replacement and diffuse stress of railway subgrade effectively, its maximum lateral replacement is decreased by 17%, its maximum vertical stress is decreased by 9.3%, its stress is well-distributed by using geocell, its bearing capacity can reach more than 180 kPa, the cost of reinforced subgrade by using geocell is decreased by 9.3%. On-the-spot observation in 6 a shows that its maximum settlement is 28 mm, its minimum settlement is 13 mm. This engineering practice proved that the method of using geocell to reinforcing railway subgrade is effective.
- railway engineering /
- geocell /
- full-scale test /
- finite element analysis /
- soft subgrade reinforcing of railway

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图 1 土工格室结构

Figure 1. Geocell structure

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图 2 无土工格室土体受力状态

Figure 2. Stress state without geocell

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图 3 土工格室加固土体受力状态

Figure 3. Stress state with geocell

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图 4 计算模型及边界条件

Figure 4. Calculating model and bourdary restrain

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图 5 基床表面沉降曲线Fig.5 Settlement curves of subgrade surface

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图 6 基床侧向位移曲线Fig.6 Lateral replacement curves of subgrade

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图 7 竖向土压力曲线

Figure 7. Vertical earth pressure distribution curves

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图 8 试验模型

Figure 8. Test model

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图 9 土工格室加固基床荷载-位移曲线Fig.9 Load-replacement curves of reinforced subgrade

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图 10 0砂填基床荷载-位移曲线Fig.10 Load-replacement curves of filled sand subgrade

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图 11 设计横断面

Figure 11. Designed cross section

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表 1 土工格室材料性能指标

Table 1. Geocell indices

环境应力开裂时间/h	低温脆化温度/℃	高温软化温度/℃	拉伸屈服强度/MPa	拉伸模量/MPa	焊缝处抗拉强度/(N·cm^-1)	边缘联接处抗拉强度/(N·cm^-1)	中间联接处抗拉强度/(N·cm^-1)
1000	-60	124	24	650	106	260	162

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表 2 计算参数

Table 2. Computational parameters

	容重/(kN·m^-3)	粘聚力/kPa	摩擦角/(°)	弹性模量/MPa
砂砾层	20.0	0	45	72.0
土工格室层	19.0	190	45	90.0
软基层	17.5	15	20	2.0
正常土层	19.0	40	40	30.0

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表 3 模型试验用砂砾筛分结果

Table 3. Screening sand-gravel result of model test

编号	筛孔(mm)通过量/%
编号	40.0	30.0	20.0	10.0	5.0	2.5	1.2	0.6
1	96.2	77.3	27.9	12.7	7.4	6.6	6.2	1.4
2	97.2	80.4	20.6	8.9	6.8	6.4	6.2	1.8
平均	96.7	78.8	24.2	10.8	7.1	6.5	6.2	1.6

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表 4 试验用砂筛分结果

Table 4. Screening sand result of test

编号	筛孔(mm)通过量/%
编号	0.600	0.300	0.150	0.074
1	93.2	52.1	19.7	2.1
2	91.3	49.6	17.3	1.7
平均	92.2	50.8	18.5	1.9

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表 5 现场观测数据

Table 5. Observation settlement data /mm

测点位置		观测时间
测点位置		1997-1-26	1997-5-8	1997-10-18	1998-5-10	1998-10-20	1999-5-6	1999-10-25	2000-5-10	2000-10-24	2001-5-15	2001-10-21	2002-5-12	2002-10-28
K241+455	右轨下	8.766	8.760	8.752	8.751	8.747	8.746	8.744	8.744	8.742	8.742	8.742	8.742	8.742
	左轨下	8.765	8.761	8.753	8.751	8.748	8.748	8.745	8.744	8.744	8.744	8.740	8.740	8.740
	道心	8.765	8.762	8.755	8.754	8.750	8.749	8.748	8.748	8.748	8.748	8.748	8.748	8.748
	右路肩	8.763	8.761	8.757	8.756	8.754	8.754	8.753	8.753	8.752	8.752	8.750	8.750	8.750
	左路肩	8.763	8.762	8.756	8.756	8.755	8.755	8.752	8.752	8.748	8.748	8.748	8.748	8.748
K241+475	右轨下	8.768	8.762	8.758	8.754	8.749	8.748	8.745	8.745	8.741	8.741	8.741	8.741	8.741
	左轨下	8.769	8.764	8.758	8.755	8.751	8.751	8.747	8.747	8.744	8.744	8.742	8.742	8.742
	道心	8.767	8.763	8.759	8.757	8.753	8.752	8.750	8.749	8.749	8.749	8.749	8.749	8.749
	右路肩	8.765	8.762	8.757	8.755	8.753	8.753	8.752	8.752	8.752	8.751	8.751	8.751	8.751
	左路肩	8.765	8.761	8.756	8.755	8.755	8.755	8.753	8.752	8.750	8.750	8.750	8.750	8.750
K241+495	右轨下	8.766	8.761	8.753	8.752	8.751	8.747	8.743	8.743	8.740	8.740	8.738	8.738	8.738
	左轨下	8.768	8.762	8.755	8.753	8.751	8.748	8.742	8.742	8.740	8.740	8.740	8.740	8.740
	道心	8.768	8.763	8.760	8.757	8.753	8.750	8.747	8.747	8.747	8.747	8.747	8.747	8.747
	右路肩	8.764	8.761	8.757	8.755	8.752	8.752	8.750	8.750	8.748	8.758	8.748	8.748	8.748
	左路肩	8.764	8.762	8.755	8.753	8.753	8.752	8.751	8.750	8.750	8.750	8.750	8.750	8.750
注: 表中高程为相对高程, 基点设为10.000 m。

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