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传统考虑土拱效应的Trapdoor松动土压力与位移无关,已逐渐不能满足工程设计需要。通过综合分析Trapdoor表面土压力随位移变化的规律,提出了Trapdoor与位移相关土压力的表达式。对于不同的土性参数和Trapdoor尺寸,计算土压力与模型试验及FLAC数值分析结果吻合良好。利用所提出的Trapdoor位移相关土压力,建立了抗局部沉陷加筋设计新方法,克服了传统Giroud(1990)设计方法不能考虑沉陷区上方土压力随沉陷位移变化的不足,从而更符合实际情况。通过扩建填埋场封顶系统及中间衬垫系统的抗局部沉陷分析及设计发现,对于封顶系统传统Giroud(1990)设计方法偏保守;而对于中间衬垫系统,上覆堆体厚度明显影响加筋体的允许张拉强度,当上覆堆体厚度H较大时(沟渠型沉陷:H>32 m,圆形沉陷:H>50 m),传统Giroud(1990)设计方法偏不安全。
Trapdoor loosening earth pressure, which has the traditional soil arching effect, has nothing to do with the displacement and has been unable to meet the needs of engineering design. By comprehensive analysis of the law of Trapdoor surface pressure changes with displacement, proposed Trapdoor and displacement-related earth pressure expression. For different soil parameters and Trapdoor dimensions, the calculated earth pressure is in good agreement with the model test and FLAC numerical analysis. By using the proposed Trapdoor displacement-related earth pressure, a new method of anti-subsidence reinforcement design is established, which overcomes the shortcoming of the traditional Giroud (1990) design method that the earth pressure above the subsidence area can not be changed with the subsidence displacement, which is more in line with the actual situation. The anti-subsidence analysis and design of the extended landfill cap system and the intermediate liner system have found that the traditional Giroud (1990) design method of the capped system is conservative. For the intermediate liner system, the thickness of the overlying reactor body obviously affects the reinforcement The allowable tensile strength of the body, the traditional Giroud (1990) design method is unsafe when the overburden thickness H is large (ditch type depression: H> 32 m, circular depression: H> 50 m).