路基工程
路基工程
로기공정
SUBGRADE ENGINEERING
2012年
5期
79-82
,共4页
水泥稳定碎石%基层%有限元%一次成型
水泥穩定碎石%基層%有限元%一次成型
수니은정쇄석%기층%유한원%일차성형
cement stabilized gravel%base%finite element%one-step forming
水泥稳定碎石基层施工中，层间污染与损伤，上下基层裂缝相互反射，容易导致基层整体性差，层间粘结不紧密。针对基层施工可能出现的这些情况，采用有限元模拟计算各种情况下基层底部弯拉应力最大值出现的部位和大小，根据计算结果分析得出：一次成型基层时基层底部受到的弯拉应力最小，结合基层施工特点，提出分层摊铺一次成型工艺，并通过对低等级试验路段铺筑检测了基层的压实度与芯样的完整性，从而验证在低等级道路上该工艺的可行性与可靠性。
水泥穩定碎石基層施工中，層間汙染與損傷，上下基層裂縫相互反射，容易導緻基層整體性差，層間粘結不緊密。針對基層施工可能齣現的這些情況，採用有限元模擬計算各種情況下基層底部彎拉應力最大值齣現的部位和大小，根據計算結果分析得齣：一次成型基層時基層底部受到的彎拉應力最小，結閤基層施工特點，提齣分層攤鋪一次成型工藝，併通過對低等級試驗路段鋪築檢測瞭基層的壓實度與芯樣的完整性，從而驗證在低等級道路上該工藝的可行性與可靠性。
수니은정쇄석기층시공중，층간오염여손상，상하기층렬봉상호반사，용역도치기층정체성차，층간점결불긴밀。침대기층시공가능출현적저사정황，채용유한원모의계산각충정황하기층저부만랍응력최대치출현적부위화대소，근거계산결과분석득출：일차성형기층시기층저부수도적만랍응력최소，결합기층시공특점，제출분층탄포일차성형공예，병통과대저등급시험로단포축검측료기층적압실도여심양적완정성，종이험증재저등급도로상해공예적가행성여가고성。
In construction of cement stabilized gravel base, pollution and damage between the layers as well as interreflection of cracks in the upper and lower layers lead to poor integrity of the base and loose bonding between the layers. Against these possible situations in the base construction, the position and magnitude of the maximum bending-tensile stress at the base in each ease is simulated and calculated by FEM. As a result, it is concluded that in case of one-step forming, the bending-tensile stress at the base is minimum; and combined with the base construction characteristics, the one-step forming technology for spreading in layers is proposed; furthermore, through the pavement in the low-grade test section, the compactness of the base and the integrity of the core sample are detected so that the feasibility and reliability of this technology for low-grade road is verified.
