基于多层次物理力学参数的小区域地震滑坡危险性评估——以长江上游石棉县城及周边为例

宋志; 倪化勇; 周洪福; 冯伟

基于多层次物理力学参数的小区域地震滑坡危险性评估——以长江上游石棉县城及周边为例

宋志^{1, 2,},
倪化勇¹,
周洪福¹,
冯伟²

1.
中国地质调查局成都地质调查中心, 成都 610081
2.
西南交通大学土木工程学院, 成都 610031

基金项目:

中国地质调查局“成渝经济区宜宾-万州沿江发展带1：5万环境地质调查”项目 121201010000150015

详细信息

作者简介:
宋志(1982-), 男, 四川省宣汉县人, 高级工程师, 主要从事岩土工程、地质灾害研究。E-mail:35842126@qq.com

中图分类号: P642.22
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- 被引次数: 0
出版历程
- 收稿日期: 2016-04-09
- 刊出日期: 2016-09-28

RISK ASSESSMENT OF SEISMIC LANDSLIDE WITHIN SMALL REGION BASED ON MULTI-LEVEL PHYSICAL AND MECHANICAL PARAMETERS: A CASE STUDY OF SHIMIAN AND ADJACENT AREAS IN THE UPPER REACHES OF YANGTZE RIVER

1.
Chengdu Institute of Geology and Mineral Resources, Chengdu 610008, China
2.
School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

摘要

摘要: 通过实地调查、遥感解译、资料收集等手段，获取滑坡崩塌体编录、松散堆积层、地质单元的岩土体物理力学参数，使得滑坡编录、地质调查数据与区域Newmark位移模型有机结合。研究表明，在滑坡编录等3个层次中，由第一层次到第三层次，物理力学参数精度逐渐下降，这也反映了滑坡编录在危险性评价中所占据的重要性，更能与实际相吻合。通过对长江上游石棉县城地质灾害潜在危险性的评估，得出了不同尺度峰值加速度下危险性分布区域与规律，经与危险性线性拟合，在峰值加速度a=0.3时，区域危险区面积呈大规模急剧上升，为区域毁灭性灾难的临界值。同时，石棉县城随着峰值加速度数值增大，危险区从滑坡编录控制逐渐过渡到坡度控制，显示了多层次物理力学参数下危险性评估的合理性。
- 滑坡 /
- 危险性 /
- 力学参数 /
- 滑坡编录
Abstract: Compared to the risk assessments of seismic landslide before, this paper achieves the landslide and collapse inventory, loose accumulated layer and the physical and mechanical parameters of rock soil mass of geological units by field survey, remote sensing interpretation and data collection. It makes an organic integration of landslide inventory, geological survey and regional Newmark displacement model. During three degrees of the landslide inventory, it can been seen that the physical and mechanical parameters get smaller gradually from the first degree to the third degree, which also inflects the importance of the landslide inventory for risk assessment and that it accords better with reality. The dangerous areas and regular under different peak acceleration are got by assessing the potential risk of geological hazard in Shimian City on the upper Yangzi River. Through the linear fitting of risks, when peak acceleration is 0.3, the dangerous areas increase greatly on the large scale that is the critical value of the regional devastating disaster. Meanwhile, the dangerous area gradually transit from that under the control of landslide inventory to that of slope, which shows the validity of the risk assessment under multi-level physical and mechanical parameters.
- landslide /
- risk /
- mechanical parameters /
- landslide inventory

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图 1 研究区石棉断裂分布简图

Figure 1. Distribution of Shimian fault in the research area

下载: 全尺寸图片幻灯片

图 2 Newmark位移模型原理图

a_c-临界加速度; a-地面加速度; D-Newmark位移量

Figure 2. Schematic diagram of Newmark displacement model

下载: 全尺寸图片幻灯片

图 3 研究区不同物理力学参数分布图

Figure 3. The distribution diagram of different physical and mechanical parameters in research area

下载: 全尺寸图片幻灯片

图 4 静态安全系数F图

Figure 4. The image of static safety coefficient

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图 5 临界加速度a_c图

Figure 5. The image of critical accelaration

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图 6 不同尺度危险性分区评价

Figure 6. Evalution of risky zones on different scales

下载: 全尺寸图片幻灯片

图 7 高、中危险区与峰值加速度拟合曲线

Figure 7. The fitted curves of medium and high risky areas and peak acceleration

下载: 全尺寸图片幻灯片

表 1 研究区物理力学参数取值

Table 1. Physical and mechanical parameters in research area

类别	编号	z/m	γ/(t·m ^-3)	c′/kPa	$\varphi$ ′/(°)
滑坡编录区(第一层次)	SM448	2.5	19.0	27	30
	SM506	2.5	19.0	25	30
	SM505	2.5	20.0	25	31
	SM107	2.5	22.0	26	31
	SM311	2.5	21.5	25	31
	SM125	2.5	21.5	26	30
	SM121	2.5	21.5	25	30
	SM309	2.5	21.5	24	30
	SM310	2.5	21.5	25	30
	SM312	2.5	21.5	24	32
	SM313	2.5	21.5	25	30
	SM452	2.5	22.0	24	32
	SM205	2.5	21.5	25	31
	SM206	2.5	21.5	26	30
	SM203	2.5	22.0	24	30
	SM204	2.5	21.5	25	30
	SM209	2.5	21.5	26	30
松散堆积区(第二层次)	SS01	3.0	21.5	28	35
	SS02	3.0	21.5	31	34
	SS03	3.0	21.5	30	34
	SS04	3.0	21.5	31	34
	SS05	3.0	21.5	32	34
	SS06	3.0	21.5	32	35
	SS07	3.0	21.5	32	35
	SS08	3.0	20.0	31	34
	SS09	3.0	22.0	31	34
	SS10	3.0	22.0	30	34
	SS11	3.0	21.5	31	34
	SS12	3.0	21.5	31	35
	SS13	3.0	21.0	30	35
	SS14	3.0	21.5	31	34
	SS15	3.0	20.0	32	35
	SS16	3.0	21.5	31	34
	SS17	3.0	21.5	30	34
	SS18	3.0	20.0	32	34
	SS19	3.0	20.0	31	34
	SS20	3.0	21.5	31	34
	SS21	3.0	21.0	30	35
	SS22	3.0	21.0	30	35
地质单元(第三层次)	DZ01	4.0	22.0	32	38
	DZ02	4.0	22.0	36	42
	DZ03	4.0	22.0	36	42
	DZ04	4.0	22.0	34	39
	DZ05	4.0	22.0	36	38
	DZ06	4.0	22.0	36	42

下载: 导出CSV

表 2 不同工况高、中危险区分布面积

Table 2. The distribution area of high and medium risky area under different working conditions

地震工况	分布面积/km ²
地震工况	高危险区	中危险区
a=0.1 g	2.78	4.01
a=0.2 g	4.12	6.29
a=0.3 g	6.78	10.02
a=0.4 g	11.62	14.28

下载: 导出CSV

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