Mechanism of the landslide deformation due to drilling of boreholes：A case study of Fanshantou landslide at Songyang County of Zhejiang Province
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摘要:
浙江省松阳县范山头滑坡是具有两层滑动带的中型土质滑坡，地质条件复杂，2010年初次发现之后，一直处于蠕动变形阶段。2018年7月开始对其采取虹吸排水工程治理。在治理施工过程中，钻探用水大量漏失，导致滑坡深部出现57~74 mm的累计变形量直至测斜孔剪断，滑坡地表裂缝最大宽度达到了17.5 mm。停止钻探，启动虹吸排水之后，滑坡裂缝停止扩大，深部位移量控制在了1 mm之内。本文基于此次实际抢险过程中的各项监测数据，分析蠕动型滑坡对地下水径流场变化的双向响应过程，并应用水力学和有效应力原理对这个响应过程进行机制分析。得出了在设计计算和工程实践中，必须充分考虑地下水径流渗透力，不可盲目忽略不计的结论，并再次验证排出滑坡体内的地下水是增强滑坡稳定性的快速有效手段之一。
Abstract:Fanshantou landslide in Songyang is a medium-sized soil landslide with two sliding belts. The geological conditions are complex. After the first discovery in 2010, it has been in a period of peristaltic deformation. In July 2018, it began to adopt siphon drainage engineering. During the process of treatment and construction, a large amount of drilling water was lost, resulting in a cumulative deformation of 57 to 74 mm in the depth of the landslide until the oblique hole was cut, and the maximum width of the landslide surface crack reached 17.5 mm. After stopping drilling and starting siphon drainage, the landslide cracks stopped expanding, and the deep area displacement was controlled within 1 mm. Based on the monitoring data of the emergency rescue, this paper analyzes the bidirectional response process of moving landslide to the changes of groundwater flow field, and analyzes the mechanism of the response process by means of hydraulics and effective stress principle. It is concluded that groundwater runoff permeability must be fully considered in design calculation and engineering practice, and can not be ignored blindly.
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Key words:
- moisturing landslide /
- drilling leaks /
- landslide response /
- groundwater runoff /
- permeability
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表 1 范山头滑坡裂缝统计表
Table 1. List of Characteristics of Cracks
裂缝走向/（°） 条数 比例/% 发育部位 形态 100～120 32 51.6 滑坡体中部、后缘 直线形 5～30 17 27.4 滑坡体右翼和前部 直线形 150～175 11 17.7 滑坡体左翼 直线形 81 1 1.61 滑坡体后缘 弧形 130 1 1.61 滑坡体后缘 弧形 
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