链子崖危岩体的变形特征、形成机制、变形破坏方式预测及稳定性初步评价

ON DEFORMATION CHARACTERISTICS, FORMATION MECHANISM, FORECAST OF DEFORMING - BREAKING PATTERN AND PRELIMINARY EVALUATION OF STABILITY IN DANGEROUS ROCK BODY OF LIANZI CLIFF OF SANXIA GORGE ON CHANGJIANG RIVER

链子崖危岩体主要变形形迹为岩体张裂,形成深大裂缝将岩体肢解而构成危岩,近期岩体表部破裂,采空区地压显示及岩体位移。二十年来,对链子崖危岩体的形成机制研讨甚多,论点各异。本文作者在大量研究工作的基础上指出:在地层组合(软基座岸坡)、构造分割、临空卸荷的基础上,底部大规模采空是危岩体形成的主要原因;而水的作用使其变形加剧。在大量的模拟计算,模型试验及地质分析的基础上,本文对危岩体的变形破坏方式进行了预测,并对其稳定性进行了初步评价。

The dangerous rock body of the Lianzi Cliff is a cracked rock body of large scale, its principal deforming feature is tensile cracking of the rock body, producing deep -large cracks and disjointing rock body to form dangerous rock body with abulk up to 2890000m3. early deforming characteris ticsof this dangerous rock body is unique crack system and development of cracks, and its recent de formation is expressed by surface cracking features, display of ground pressure in the mining empty area and displacement of the rock body for twenty years, many research work have been put on, the forming mechanism of the dangerou rock body of Lianzi Cliff, viewpoints are different, this time, after a large number of work it is considered that on the basis of strata combination (bank with soft base ) .structural separation and unloading on edge of bank,large scale mining empty area in the base of slope is the main cause of forming dangerous rock body; and affect of water is strengthen defor mation. Through a large number of analogous calculation, test model experiment and geological anal ysis. this paper has carried out forecast for breaking pattern of the dangerous rock body , and prelimi nary evaluation for its stability.