LIN Jing-lan,HUANG Yan-he.Review of Study on Formation Mechanism of Slope Disintegration Erosion and Its Problems[J].Research of Soil and Water Conservation,2010,17(02):41-44.
崩岗侵蚀的成因机理研究与问题
- Title:
- Review of Study on Formation Mechanism of Slope Disintegration Erosion and Its Problems
- 分类号:
- S157.1;P642.21
- 摘要:
- 现有研究成果表明：疏松、深厚的基岩风化壳（尤其是花岗岩）是崩岗发育的物质基础，花岗岩内各种节理、裂隙存在形成大量的软弱结构面，使土体在重力作用下极易产生崩岗；降雨是崩岗侵蚀的重要诱发因素，它产生地表径流，引起冲刷，同时还通过入渗，增加土体自重和降低抗剪强度而促进崩岗发育；崩壁侵蚀量的测定是采用常规方法或航片结合常规调查的方法进行。由于这些研究未能明确崩岗侵蚀的主导岩土特性及随土壤含水量变化的规律，尤其是未能测定瞬时崩壁侵蚀量，导致成因机理的深入研究受到限制。为此，作者提出采用无棱镜全站仪测量瞬时崩壁侵蚀量，通过钻探方式获取自然地理条件相似的崩岗密集区与非崩岗区的岩土体，提炼主导岩土特性及与降雨的关系，进一步探讨崩岗侵蚀的成因机理。
- Abstract:
- The result of current research achievements on formation mechanism of the slope disintegration erosion shows that the weathered shell of the loose and thick base rock (mainly consisting of granite) is the material basis for the development of slope disintegration, the weak structural face of the granite due to the existence of the joints and cranny can make the slope disintegration apt to occur under the gravity of soil,rainfall, one of the most influence factor, will not only produce ground run-off which can cause scouring effect, but can also lead to a deadweight increases and shear strength decreases of the soil body through water permeance, which will promote the development of slope disintegration, and the erosion amount of the wall collapse was measured using the conventional investigation method or that in combination with aerial photos. However, the deep-going study on its formation mechanism is now still restricted by the unclearness of the properties of the leading rock and soil in the slope disintegration erosion and the law of their variation with the soil moisture change, especially the unavailability to measure the instant erosion amount of the wall collapse. Therefore, it is proposed by the author to adopt the reflectorless total station to measure the instant erosion amount of the wall collapse, to use drilling to obtain the rock and soil in the dense collapse area and those in the non-collapse area but with the similar geographical conditions for extracting the properties of the leading rock and soil, and to analyze the law of the change in the rock and soil properties under different soil moistures by testing so as to further study the formation mechanism of the slope disintegration erosion.
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备注/Memo
收稿日期:2009-8-19。
基金项目:国家自然科学基金“南方花岗岩地区崩岗侵蚀成因机理研究”（40671113）
作者简介:林敬兰（1970- ），女，博士生，从事水土保持监测及研究。E-mail：sunny_cn@126.com
通讯作者:黄炎和（1962- ），博士，教授，长期从事土壤侵蚀研究。E-mail：yanhehuang@hotmail.com