首页|非对称荷载下内撑式基坑支护结构参数分析及设计优化探讨

非对称荷载下内撑式基坑支护结构参数分析及设计优化探讨

Parameter analysis and discussion on design optimization of support structure of internal bracing foundation excavation under asymmetric loads

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非对称荷载作用下,内撑式基坑会向荷载小侧整体偏移,这将不利于基坑的稳定,因此有必要对支护结构进行设计优化.本研究以某偏压综合管廊基坑为例,通过有限元软件PLAXIS 2D对该基坑进行了仿真模拟,模拟结果与实测数据吻合良好,验证了模型的有效性.进一步对该基坑进行参数分析,研究了支护结构长度、等效厚度和弹性模量对支护结构变形和基坑安全性的影响.研究结果表明,在两侧支护结构均按偏压侧进行设计的基础上,增大某侧支护结构长度,会使该侧支护结构水平位移最大值增大,分别增大两侧支护结构等效厚度、弹性模量,均可以减小该侧支护结构水平位移最大值和非偏压侧支护结构顶部逆向位移.基于参数分析,提出一种针对非对称荷载基坑的简单有效、经济可行的优化思路,并通过数值模拟对优化效果进行了分析,证明了该优化思路的可行性.
Under the action of asymmetrical load,the internal bracing foundation excavation will skew to the small side of the load,which will be deleterious to the stability of the foundation pit,so it is necessary to optimize its design.A unsymmetrical loaded pipe gallery foundation pit is used as an example in this paper,and the finite element software plaxis 2D was used to simulate this foundation pit.The simulation results are in good agreement with the measured data,which verifies the validity of the model.Then the supporting structure parameters of the foundation pit are analyzed,and the influence of the length,equivalent thickness and elastic modulus of the supporting structure on the deformation of the supporting structure and the safety of the foundation pit is studied.The research results show that when the supporting structures on both sides are designed according to the biased side,the maximum horizontal displacement of a side supporting structure increases with the equivalent thickness of the side supporting structure.And with the increase of the equivalent thickness and elastic modulus of the supporting structure on both sides,the maximum horizontal displacement of the side supporting structure and the reverse displacement of the top of the non-biased side supporting structure will decrease.Finally,a simple and economical optimization idea for asymmetric load foundation pits is proposed by parameter analysis,and the optimization effect is analyzed through numerical simulation,which proves the effectiveness of the optimization idea.The conclusions and optimization idea can provide references for similar projects.

excavation engineeringasymmetric loadfinite elementparameter analysisoptimization measures

孙志浩、徐长节、房玲明、黄福明、黄展军、范润东

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浙江大学建筑工程学院,310058杭州

浙江大学平衡建筑研究中心,310058杭州

华东交通大学江西省岩土工程基础设施安全与控制重点实验室,330013南昌

华东交通大学江西省地下空间技术开发工程研究中心,330013南昌

浙江大学福世德勘测设计研究院,310058杭州

南昌轨道交通集团有限公司,330013南昌

浙江杭海城际铁路有限公司,314000嘉兴

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基坑工程 非对称荷载 有限元 参数分析 优化措施

国家杰出青年科学基金资助项目国家自然科学基金资助项目浙江省自然科学基金委员会-华东院联合基金资助项目国家自然科学基金-高铁联合基金资助项目江西省自然科学基金资助项目

5172580251878276LHZ19E080001U193420820192ACB20001

2024

应用力学学报
西安交通大学

应用力学学报

CSTPCD北大核心
影响因子:0.398
ISSN:1000-4939
年,卷(期):2024.41(1)
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