饱和黄土场地原位试验及液化势评价

董林; 严武建; 夏坤; 李少华; 刘琨

doi:10.11899/zzfy20180422

饱和黄土场地原位试验及液化势评价

doi: 10.11899/zzfy20180422

董林^{1, 2,},
严武建^{1, 2},
夏坤^{1, 2},
李少华^{1, 2},
刘琨^{1, 2}

1.
中国地震局兰州地震研究所, 黄土地震工程重点实验室, 兰州 730000
2.
甘肃省岩土防灾工程技术研究中心, 兰州 730000

基金项目:

中国地震局地震预测研究所兰州科技创新基地基本科研业务费专项 2018IESLZ03

国家自然科学基金 51708525

国家自然科学基金 51608496

甘肃省青年科技基金计划 18JR3RA415

详细信息

作者简介:
董林, 男, 生于1985年。副研究员。主要从事岩土地震工程研究。E-mail:donglin408@163.com

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出版历程
- 收稿日期: 2018-01-03
- 刊出日期: 2018-12-01

In-situ Tests and Liquefaction Potential Evaluation for Saturated Loess Sites

Dong Lin^{1, 2
,},
Yan Wujian^{1, 2},
Xia Kun^{1, 2},
Li Shaohua^{1, 2},
Liu Kun^{1, 2}

1.
Key Laboratory of Loess Earthquake Engineering, Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China
2.
Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, Lanzhou 730000, China

摘要

摘要: 目前，主要依靠室内动力试验对黄土液化势进行评价。由于黄土特殊的结构性，室内试验对其饱和的过程较为复杂，且与实际场地饱和黄土差异明显，导致室内黄土液化试验结果并不能代表现场饱和黄土的抗液化强度。本文选取兰州市西固区寺儿沟村某饱和黄土场地进行钻孔测试，现场实施了标准贯入试验、静力触探试验以及剪切波速测试。应用Robertson的土类指数分类图对该场地不同含水率黄土的土类进行了界定，确定了饱和黄土属于类砂土，有液化势。应用NCEER推荐方法，计算了3组原位试验数据的饱和黄土循环抗力比（CRR），通过与1976年唐山地震和1999年集集地震液化土CRR对比，得出了饱和黄土抗液化强度很低的结论。
- 黄土 /
- CPT /
- 土类指数 /
- 原位试验 /
- 循环抗力比
Abstract: At present, liquefaction potential evaluation for loess mainly depends on laboratory dynamic test. Because of the special micro-structure, loess sample saturation process is very complicated, and the saturated loess sample is remarkably different from actual saturated loess in field. Therefore, laboratory cyclic test results can not fully represent liquefaction resistance strength of field saturated loess. This paper selects a saturated loess site in Si'ergou, Xigu district, Lanzhou City, drills a borehole, and carries out standard penetration test, cone penetration test, and shear wave velocity test. Using CPT-based soil behavior-type chart proposed by Robertson, soil behavior classification of loess with different water content was determined, and saturated loess definitely belongs to sand-like soils. Using NCEER recommended methods, cyclic resistance ratio(CRR) of saturated loess was calculated respectively from SPT, CPT, and V_S. By comparing with SPT-based and CPT-based CRR range of liquefied soils in 1976 Tangshan earthquake and 1999 Chi-Chi earthquake, we found that saturated loess is very vulnerable to liquefaction.
- Loess /
- CPT /
- Behavior-type index /
- In-situ tests /
- CRR

HTML全文

图 1 饱和黄土场地钻孔柱状图

Figure 1. Borehole profile of saturated loess site

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图 2 静力触探试验设备

Figure 2. Cone penetrometer equipment

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图 3 场地CPT测试结果

Figure 3. CPT test results of loess site

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图 4 场地CPT土层分层

Figure 4. CPT soil layer profile of loess site

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图 5 原位试验结果对比

Figure 5. Comparison of test results of three in-situ

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图 6 Robertson土类指数分类图

Figure 6. CPT-based soil behavior-type chart proposed by Robertson

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图 7 黄土土类指数分类图

Figure 7. CPT-based loess soil behavior-type chart

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表 1 黄土CPT土类指数

Table 1. loess soil behavior-type index

深度/m	q_c/MPa	f_s/kPa	R_f/%	σ_v/kPa	σ′_v/kPa	Q	F/%	I_c
9.9	3.95	64.57	1.634	154.43	154.43	30.554	1.701	2.060
12.29	3.23	49.15	1.523	193.556	193.556	21.799	1.620	2.207
14.8	3.87	71.20	1.840	234.72	234.72	23.731	1.958	2.151
17	5.40	71.01	1.315	272.4	272.4	31.074	1.385	2.078
19	7.55	101.20	1.340	306.8	306.8	41.352	1.397	1.959
20.95	6.53	98.06	1.501	340.72	340.72	33.553	1.583	2.029
22.42	6.19	121.71	1.965	366.592	366.592	30.438	2.088	2.039
23.97	7.63	159.47	2.091	393.872	393.872	36.437	2.205	1.958
26	6.77	150.12	2.217	430.3	430.3	30.563	2.368	2.026
27.65	4.66	125.78	2.701	460.95	454.45	19.687	2.997	2.197
28.95	4.99	136.82	2.742	485.65	466.15	20.861	3.038	2.171

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表 2 饱和黄土循环抗力比

Table 2. Cyclic resistance ratio of saturated loess

深度/m	q_c/MPa	f_s/kPa	R_f/%	σ_v/kPa	σ′_v/kPa	I_c	n	C_Q	q_c_1N	K_c	(q_c_1N)_cs	CRR
27.65	4.66	125.78	2.701	460.95	454.45	2.197	0.7	0.469	2.197	1.659	36.250	0.080
28.95	4.99	136.82	2.742	485.65	466.15	2.171	0.7	0.463	2.171	1.599	36.952	0.081

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