天水锻压机床厂滑坡变形破坏机制及形成演化

田尤; 杨为民; 刘廷; 李浩; 程小杰

天水锻压机床厂滑坡变形破坏机制及形成演化

田尤^1,,
杨为民²,
刘廷^{1, 2},
李浩^{1, 2},
程小杰²

1.
中国地质大学地球科学与资源学院, 北京 100083
2.
中国地质科学院地质力学研究所, 北京 100081

基金项目:

中国地质调查局地质调查项目"西秦岭北缘断裂带天水段地震地质灾害调查评价"项目 12120114035601

详细信息

作者简介:
田尤(1991-), 男, 硕士研究生, 从事地质灾害、工程地质及矿物学等方面的研究。E-mail:asem_ty@163.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: 2014-11-03
- 刊出日期: 2015-06-01

DEFORMATION MECHANISM AND EVOLUTIONARY PROCESS OF THE TIANSHUI FORGING MACHINE PLANT LANDSLIDE IN GANSU

TTIAN You^1
,,
YANG Wei-min²,
LIU Ting^{1, 2},
LI Hao^{1, 2},
CHENG Xiao-jie²

1.
School of Geosciences and Resources, China University of Geosciences, Beijing 100083, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China

摘要

摘要: 天水锻压机床厂滑坡(1.4×10⁶ m³)发生于1990年8月11日, 滑坡体主要由次生黄土组成, 滑床为第四系黄土和新近系泥岩, 滑坡沿黄土-泥岩接触面发生, 属黄土接触面滑坡。通过野外调查和工程钻探对锻压机床厂滑坡变形破坏机制及形成演化进行研究, 结果表明, 该滑坡变形破坏方式表现为滑移-拉裂式, 受区内二元斜坡结构控制, 是在工程切坡和降雨、灌溉等诱发因素作用下形成; 其形成演化经历了高陡边坡形成期→滑坡孕育期→滑动面贯通临界期→滑坡启动下滑堆积期→滑坡复活变形期等过程。该滑坡目前处于欠稳定状态, 遇地震或强降雨等作用, 极有可能再次复活下滑。研究成果可为该类滑坡的防治预警提供理论依据。
- 天水锻压机床厂滑坡 /
- 工程切坡 /
- 变形破坏机制 /
- 形成演化
Abstract: The Tianshui Forging Machine Plant Landslide in Gansu Province happened on August 11, 1990 with a volume of 1.4×10⁶ m³. It is a loess interface landslide occurring along the loess/mudstone interface. The landslide body is mainly composed of secondary loess, and the slip bed is mainly composed of Quaternary loess and Neogene mudstone. The landslide is controlled by the double-layered structure of the slope in area, being induced by some factors such as engineering excavation, rainfall and irrigation. The research on the deformation mechanism and evolutionary process of the landslide based on geological survey and engineering drilling shows that the formation process can be divided as follow: the formation period of high and steep side slopes; the landslide incubation period; sliding surface through critical period; landslide falling and accumulating period; landslide revival and deformation period. Field investigation and engineering drilling indicate that the landslide is unstable at present. It can most likely revive and slide again if there is earthquake or heavy rainfall. The results can provide theoretical basis for the disaster warning of this kind of landslide.
- the Tianshui Forging Machine Plant Landslide /
- engineering excavation /
- deformation mechanism /
- evolutionary process

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图 1 天水锻压机床厂滑坡综合平面图

Figure 1. Planar graph of Tianshui Forging Machine Plant

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图 2 天水锻压机床厂滑坡剖面图

Figure 2. Profile graph of Tianshui Forging Machine Plant

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图 3 天水锻压机床厂滑坡ZK2、ZK4钻孔柱状图

Figure 3. Columnar sections of the drill holes of ZK2 and ZK4 in Tianshui Forging Machine Plant

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图 4 天水锻压机床厂滑坡全貌及变形破坏特征

Figure 4. View and the characteristics of deformation damage of Tianshui Forging Machine Plant

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图 5 天水锻压机床厂滑坡形成机理

Figure 5. Formation mechanism of Tianshui Forging Machine Plant

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图 6 天水锻压机床厂边坡开挖受力示意图

Figure 6. Free-body diagram of slope excavation of Tianshui Forging Machine Plant

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图 7 天水锻压机床厂滑坡形成演化过程

Figure 7. Formation process of Tianshui Forging Machine Plant

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表 1 天水地区易滑地层物理力学性质统计表^[1]

Table 1. Statistics of physical and mechanical properties of easy sliding layers in Tianshui area

岩性	时代	物理性质			抗剪强度
		含水量/%	天然容重/(kN·m^-3)	干容重/(kN·m^-3)	峰值		残余
		含水量/%	天然容重/(kN·m^-3)	干容重/(kN·m^-3)	C/kPa	φ/(°)	C_r/kPa	φ_r/(°)
干黄土	Q₃	10.0~18.2	14.3~15.4	12.8~13.9	24.5~52.0	25.3~31.7	5.0~12.3	22.0~27.5
湿黄土	Q₃	21.4~28.0	15.8~17.2	13.5~15.4	5.0~12.5	6.7~17.4	＜5	7.0~15.5
弱风化泥岩	N₂	3.2~13.5	19.6~25.7	18.4~25.2	90.0~1570.0	18.0~44.2	20.0~293.0	15.4~33.6
强风化泥岩	N₂	20.0~30.2	19.4~20.8	14.9~17.2	9.0~35.0	7.4~11.9	7.0~28.0	4.5~7.0
注：C—黏聚力；φ—内摩擦角；C_r—残余黏聚力；φ_r—残余内摩擦角

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表 2 天水锻压机床厂滑坡区岩土的抗剪强度指标^[23]

Table 2. Shear strength of rock and soil in Tianshui Forging Machine Plant

岩性	时代	原状土		重塑土		饱和重塑土
岩性	时代	C/kPa	φ/(°)	C_r/kPa	φ_r/(°)	C_r/kPa	φ_r/(°)
离石黄土	Q₂	85	17.0	50	13.5	15	4.0
泥岩	N	45	13.5	20	4.5	13	2.5

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