均匀设计原理的基坑设计参数优选中的应用
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摘要
基坑设计就是通过多次试算不断搜寻在保证支护结构安全可靠的前提下更为经济合理的设计参数组合的过程,专业性强,对设计人员执业经验依赖性高。将每一次试算都当作一次试验,应用均匀设计原理合理安排试算方案,可以有效降低对设计人员的经验依赖,明显减少试算次数,提高基坑设计的效率,保证基坑支护的结构的安全可靠性和经济合理性。以深厚软土地区水泥土搅拌桩重力式挡土墙基坑支护为例,选择挡墙宽度、嵌固深度、被动区加固土体深度及宽度作为因素进行均匀设计试验,在对试验结果进行回归分析的基础上建立各项安全指标与设计参数之间的近似函数关系;以每延米水泥土搅拌重力式挡墙的体积最小作为控制目标,结合规范相关要求作为约束条件,建立规划求解,快速完成基坑支护结构设计参数优选;最终给出基于均匀设计原理的基坑设计流程图。
The design of foundation pit is the process of ensuring the safety and reliability of the supporting structure and then searching for more economic and reasonable combination of design parameters by multiple trial calculations. It is highly professional and high dependence on the designer's practice experience. We treat each calculation as test and use the principle of uniform design to reasonably arrange the trial calculation scheme, which can effectively reduce the experience dependence of the designers, reduce the number of trial calculations, improve the efficiency of the foundation pit design, and ensure the safety and economy of foundation pit support structure. This research takes the foundation pit support of gravity retaining wall of cement soil mixing pile in deep soft soil area as an example. We choose the width of retaining wall, the embedded depth, the depth and width of soil reinforcement in the passive zone as parameters of the uniform design test. And based on the regression analysis of test results, we establish the approximate function relationship between the safety indexes and the design parameters. Aiming at the minimum volume of cement soil mixing gravity retaining wall, we combine the requirements of standard as the constraint conditions, establish the programming solution, and complete quickly the optimization of design parameters of the supporting structure of foundation pit. Finally, based on the principle of uniform design, we obtain the design flow chart of the foundation pit.
The design of foundation pit is the process of ensuring the safety and reliability of the supporting structure and then searching for more economic and reasonable combination of design parameters by multiple trial calculations. It is highly professional and high dependence on the designer's practice experience. We treat each calculation as test and use the principle of uniform design to reasonably arrange the trial calculation scheme, which can effectively reduce the experience dependence of the designers, reduce the number of trial calculations, improve the efficiency of the foundation pit design, and ensure the safety and economy of foundation pit support structure. This research takes the foundation pit support of gravity retaining wall of cement soil mixing pile in deep soft soil area as an example. We choose the width of retaining wall, the embedded depth, the depth and width of soil reinforcement in the passive zone as parameters of the uniform design test. And based on the regression analysis of test results, we establish the approximate function relationship between the safety indexes and the design parameters. Aiming at the minimum volume of cement soil mixing gravity retaining wall, we combine the requirements of standard as the constraint conditions, establish the programming solution, and complete quickly the optimization of design parameters of the supporting structure of foundation pit. Finally, based on the principle of uniform design, we obtain the design flow chart of the foundation pit.
引文
[1] 方开泰.均匀设计与均匀设计表[M].北京:科学出版社,1994.
[2] 曾绍钧.均匀设计及其应用[M].北京:中国医药科技出版社,2005.
[3] 张国秋, 王文漩. 均匀试验设计方法应用综述[J]. 数理统计与管理, 2013,32(1):89-99.
[4] 李端有, 李迪, 马水山. 三峡永久船闸开挖边坡岩体力学参数反分析[J]. 长江科学院院报,1998,15(2):10-13.
[5] 梅松华,盛谦, 冯夏庭. 均匀设计在岩土工程中的应用[J]. 岩石力学与工程学报, 2004,23(16):2 694-2 697.
[6] 汤华, 史贵才, 葛修润,等. 均匀设计原理在地下工程位移反分析中的应用[J]. 岩石力学与工程学报, 2006,25(10):2 017-2 022.
[7] 吴朝阳, 李正农, 钟旻. 基于均匀设计的基坑土层参数反演和周边沉降预测[J]. 建筑结构, 2014,44(3):84-89.
[8] 吴迪, 周顺华, 温馨. 砂性土层泥水盾构泥浆成膜性能试验[J]. 岩石力学与工程学报, 2015,34(S1):3 460-3 467.
[9] JGJ120-2012, 建筑基坑支护技术规程[S].
[10] GB50497-2009, 建筑基坑工程监测技术规范[S].
[2] 曾绍钧.均匀设计及其应用[M].北京:中国医药科技出版社,2005.
[3] 张国秋, 王文漩. 均匀试验设计方法应用综述[J]. 数理统计与管理, 2013,32(1):89-99.
[4] 李端有, 李迪, 马水山. 三峡永久船闸开挖边坡岩体力学参数反分析[J]. 长江科学院院报,1998,15(2):10-13.
[5] 梅松华,盛谦, 冯夏庭. 均匀设计在岩土工程中的应用[J]. 岩石力学与工程学报, 2004,23(16):2 694-2 697.
[6] 汤华, 史贵才, 葛修润,等. 均匀设计原理在地下工程位移反分析中的应用[J]. 岩石力学与工程学报, 2006,25(10):2 017-2 022.
[7] 吴朝阳, 李正农, 钟旻. 基于均匀设计的基坑土层参数反演和周边沉降预测[J]. 建筑结构, 2014,44(3):84-89.
[8] 吴迪, 周顺华, 温馨. 砂性土层泥水盾构泥浆成膜性能试验[J]. 岩石力学与工程学报, 2015,34(S1):3 460-3 467.
[9] JGJ120-2012, 建筑基坑支护技术规程[S].
[10] GB50497-2009, 建筑基坑工程监测技术规范[S].