CAJ | 학술논문

Gomal Zam大坝坝基地层为灰岩, 岩石较坚硬, 但坝基断层、裂隙发育, 岩体破碎, 完整性和均一性较差, 变形模量低, 其坝基岩体质量以Ⅳ类为主, 不能满足高混凝土坝坝基要求; 右岸坝肩由F2、 F3和F13断层组成的块体, 抗滑稳定性不满足要求. 分析认为, 坝基深挖对提高建基面岩体质量作用不大, 且经济上不合理; 以弱卸荷岩体作为坝基, 通过固结灌浆改善岩体的完整性和均一性, 可以提高坝基岩体的变形模量; 通过混凝土置换对F2断层带进行处理, 处理后其抗滑稳定安全系数满足设计要求.
Gomal Zam대패패기지층위회암, 암석교견경, 단패기단층、 렬극발육, 암체파쇄, 완정성화균일성교차, 변형모량저, 기패기암체질량이Ⅳ류위주, 불능만족고혼응토패패기요구; 우안패견유F2、 F3화F13단층조성적괴체, 항활은정성불만족요구. 분석인위, 패기심알대제고건기면암체질량작용불대, 차경제상불합리; 이약사하암체작위패기, 통과고결관장개선암체적완정성화균일성, 가이제고패기암체적변형모량; 통과혼응토치환대F2단층대진행처리, 처리후기항활은정안전계수만족설계요구.
Though the foundation rocks of Gomal Zam Dam Project are mainly composed of hard limestone ,they cannot meet the design requirements for gravity dam due to their low deformation modulus and high fracture index as a results of jointing and faulting .The stability of right abutment against sliding is also cann 't meet the code requirement due to the ex-istence of fault F2,F3 and F13.Because the river valley is rather narrow and steep ,and the rocks at depth are still frac-tured,it is unsuitable for deep excavation .Thus,the dam has to be based on moderately stress-relieved rocks,which would be treated by complete consolidation grouting to improve the rock mass integrity and deformation modulus .Meanwhile the concrete replacement method is applied for treatment of Fault F 2 to enhance the overall stability of the right bank abut-ment.