CAJ | 학술논문

基于硬化土模型（HS 模型），利用 PLAXIS 有限元分析软件对上海地区某软土浅基坑中内插 H 型钢的重力式挡土墙支护开展有限元分析，根据数值试验结果和监测数据对基坑变形和稳定性进行研究。研究发现，（1）内插 H 型钢重力坝围护在浅基坑局部开挖7~8 m 范围内有着较好的可行性和工程效果，在浅基坑支护中可作为重力式围护的补充手段；（2）使用 PLAXIS 的 HS 硬化土模型模拟基坑开挖具有较好的精度和与实际情况较接近的结果，HS 模型的参数可以根据工程经验进行取值；（3）实际基坑监测结果表明浅基坑的局部深坑处的内插 H 型钢重力坝在两端重力坝的约束下其位移发展受到一定控制，可显著提高基坑的整体稳定性，且内插 H 型钢可以增加围护体本身的刚度，可抵抗部分土压力弯矩，一定程度上控制了围护体的位移；（4）实际工程中对内插 H 型钢重力坝的局部开挖深度要谨慎选择，首先在周边环境保护条件较为宽松的条件下采用，局部深坑深度建议在7~8 m 之间，并且基坑整体开挖深度建议在5~6 m 之间。通过对软土浅基坑中内插 H型钢的重力式挡土墙支护的研究，能对相关基坑支护工程提供更可靠的技术支持。
기우경화토모형（HS 모형），이용 PLAXIS 유한원분석연건대상해지구모연토천기갱중내삽 H 형강적중력식당토장지호개전유한원분석，근거수치시험결과화감측수거대기갱변형화은정성진행연구。연구발현，（1）내삽 H 형강중력패위호재천기갱국부개알7~8 m 범위내유착교호적가행성화공정효과，재천기갱지호중가작위중력식위호적보충수단；（2）사용 PLAXIS 적 HS 경화토모형모의기갱개알구유교호적정도화여실제정황교접근적결과，HS 모형적삼수가이근거공정경험진행취치；（3）실제기갱감측결과표명천기갱적국부심갱처적내삽 H 형강중력패재량단중력패적약속하기위이발전수도일정공제，가현저제고기갱적정체은정성，차내삽 H 형강가이증가위호체본신적강도，가저항부분토압력만구，일정정도상공제료위호체적위이；（4）실제공정중대내삽 H 형강중력패적국부개알심도요근신선택，수선재주변배경보호조건교위관송적조건하채용，국부심갱심도건의재7~8 m 지간，병차기갱정체개알심도건의재5~6 m 지간。통과대연토천기갱중내삽 H형강적중력식당토장지호적연구，능대상관기갱지호공정제공경가고적기술지지。
Based on the hardening-soil model, finile element analyzing method was carried out on supporting system of gravity retaining wall with embedded H-shaped steel through PLAXIS FEM software; and researches was conducted on the deformation and stability of the support system with the simulation results and on-site monitoring data. Researches show that (1) Gravity retaining wall with H-shaped steel shows good feasibility and engineering functions in the range of 7-8 m of local excavation of shallow foundation pit, which can be the supplementary means of gravity-style enclosure. (2) Good precision and results close to actual situations can be obtained by hardening-soil model(HS model for short) embedded in PLAXIS FEM software to simulate the foundation pit, and parameters of HS model can be obtained according to engineering experience. (3) On-site monitoring data of foundation pit shows that the displacement development of gravity retaining wall with H-shaped steel was controlled under the restriction of retaining wall on both ends, which is good for global stability; and that H-shaped steel can well improve the stiffness of supporting system and resist some of bending moment produced by soil mechanics, which to some extent controlled the support system’s displacement. (4) In actual engineering local excavating depth of gravity retaining wall with H-shaped steel should be carefully chosen, which is advisably used under the condition of loose requirement for surroundings’ protection, with a advisable excavating depth of 7-8 m in local foundation excavation and the global excavating depth of 5-6 m. Through the research of gravity retaining wall support with H-shaped steel in shallow foundation pit in soft soil area, more reliable technique supports can be offered for relevant supporting engineering of foundations.