水土压力分算与合算的统一算法

摘要
图/表
参考文献
相关文章 (15)

全文: PDF (199 KB) HTML (1 KB)
输出: BibTeX | EndNote (RIS)

摘要以土中孔隙水特征为基础，假定土体中的黏性土颗粒吸附的结合水会抵消一部分土中孔隙，最终把土的孔隙比、界限含水量、颗粒分析等物理参数引入土水压力计算，提出一个可以采用土层物理指标计算的水压力比率，给出通过土体渗透系数试验测定值的方法，通过该参数可以把有效应力强度指标与总应力强度指标统一在一个强度公式中。同时，给出一个可以统一水土分算和合算的算法，实现水土压力分算和合算结果之间的过渡，为解决水土压力分算和合算结果的跳跃提供一个新思路。根据理论分析，渗透系数–孔隙比实测曲线应该沿e轴正向平移，土体中黏粒成分含量越高，平移量越大，相关文献的试验数据可证实这点；含有黏粒成分的砂性土采用水土分算偏于保守，而孔隙比较大的黏性土采用水土合算偏于不安全；围护结构上的水土压力计算不但与土体分类有关，还与孔隙比直接相关。

	服务

	把本文推荐给朋友
	加入我的书架
	加入引用管理器
	E-mail Alert
	RSS
	作者相关文章

关键词 ：土力学, 水土压力, 有效应力原理, 孔隙水压力, 渗透系数, 界限孔隙比

Abstract：Applying combined calculation of water and earth pressures for clay leads to a result which is more close to the field measurement value，however，obviously violates the principle of effective stress. Based on characteristics of the pore water in soil，it is assumed that the bound water absorbed by the clay particles in the soil offsets part of soil pore，and finally physical parameters such as void ratio，boundary water content，particle analysis，etc. are introduced to calculation of water and earth pressures on retaining structures to propose a coefficient which can be calculated through physical parameters of soil and to provide the method of measuring the value of through permeability tests. With the coefficient ，the effective stress intensity index and total stress intensity index are integrated in one strength formula. A new calculation method to unify the separate calculation and combined calculation of water and earth pressures is proposed to carry out the transition between results of the two conventional calculation methods and provide a new idea for solving the jump problem between the two results. According to the theory analysis of this paper，the measured permeability coefficient-void ratio curve will have a translational move in a forward direction along e-axis. The more clay particles that soil contains will have the larger translation，which has been verified by experimental data of related literatures. Separate calculation of water and earth pressures is too conventional for sand soil containing clay particles while combined calculation of water and earth pressures for clay with high void ratio can?t guarantee the safety. Water and earth pressures on retaining structure are related not only to the soil categories，but also the void ratio.

Key words： soil mechanics water and earth pressures effective stress principle pore water pressure permeability coefficient limit void ratio

收稿日期: 2011-01-07

引用本文:

王洪新. 水土压力分算与合算的统一算法[J]. 岩石力学与工程学报, 2011, 30(5): 1057-1064.
WANG Hongxin. UNIFIED METHOD OF SEPARATE AND COMBINED CALCULATION OF WATER AND EARTH PRESSURES. , 2011, 30(5): 1057-1064.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/I5/1057

[2]	杨晓军，龚晓南. 基坑开挖中考虑水压力的土压力计算[J]. 土木工程学报，1997，30(4)：58-62.(YANG Xiaojun，GONG Xiaonan. Calculation of earth pressure on excavation considering pore pressure[J]. China Civil Engineering Journal，1997，30(4)：58-62.(in Chinese)) " target="_blank">
[6]	方玉树. 基于水压率讨论土中孔隙水压力及有关问题[J]. 岩土工程界，2007，10(5)：21-26.(FANG Yushu. Discussion on pore pressure and related problems considering hydraulic pressure ratio[J]. Geotechnical Engineering World，2007，10(5)：21-26.(in Chinese)) " target="_blank">
[4]	李广信. 基坑支护结构上水土压力的分算与合算[J]. 岩土工程学报，2000，22(3)：348-352.(LI Guangxin. Estimating the water and earth pressures on the supporting structure around a foundation pit separately and together[J]. Chinese Jounal of Geotechnical Engineering，2000，22(3)：348-352.(in Chinese))
[8]	殷宗泽. 土工原理[M]. 北京：中国水利水电出版社，2007：151-152.(YIN Zongze. Geotechnical principle[M]. Beijing：China Water Power Press，2007：151-152.(in Chinese)) " target="_blank">
[10]	梅国雄，宋林辉，宰金珉. 地下水浮力折减试验研究[J]. 岩土工程学报，2009，31(9)：1 476-1 480.(MEI Guoxiong，SONG Linhui，ZAI Jinmin. Experimental study on reduction of groundwater buoyancy[J]. Chinese Jounal of Geotechnical Engineering，2009，31(9)：1 476- 1 480.(in Chinese)) " target="_blank">
[3]	陈愈炯，温彦锋. 基坑支护结构上的水土压力[J]. 岩土工程学报，1999，21(2)：139-143.(CHEN Yujiong，WEN Yanfeng. Water and earth pressures on the supporting structure around a foundation pit[J]. Chinese Jounal of Geotechnical Engineering，1999，21(2)：139-143.(in Chinese)) " target="_blank">
[7]	姚秦. 基坑工程的水土压力混合算法[J]. 岩石力学与工程学报，2001，20(1)：134-135.(YAO Qin. Earth pressure calculation considering soil-water jointly on excavation[J]. Chinese Journal of Rock Mechanics and Engineering，2001，20(1)：134-135.(in Chinese))
[1]	魏汝龙. 总应力法计算土压力的几个问题[J]. 岩土工程学报，1995，17(6)：120-125.(WEI Rulong. Issues on calculation of earth pressure using total stress method[J]. Chinese Jounal of Geotechnical Engineering，1995，17(6)：120-125.(in Chinese))
[5]	曹雪山. 支护结构上水土压力计算微观分析[J]. 四川建筑科学研究，2006，32(5)：106-110.(CAO Xueshan. Micro-analysis of water pressure and earth pressure on support structure[J]. Building Science Research of Sichuan，2006，32(5)：106-110.(in Chinese)) " target="_blank">
[9]	欧孝夺，易念平，陆增建，等. 尾矿砂土渗透系数与其埋深之间的关系分析[J]. 广西大学学报：自然科学版，2001，26(3)：219-221.(OU Xiaoduo，YI Nianping，LU Zengjian，et al. A mathematical model of permeability coefficient and cover earth pressure for tailings[J]. Journal of Guangxi University：Natural Science，2001，26(3)：219-221.(in Chinese)) " target="_blank">