矿山井塔结构体系是由上部结构（井塔）、桩筏基础、地基和井壁四部分组成的统一体，四者共同承受外荷载，并相互影响。但工程中常规的设计方法普遍将上部结构（井塔）、桩筏基础和地基隔离开来分别考虑，且不考虑桩筏基础与井壁的共同承载特性，这种设计方法忽略了共同承载，怱略了上部结构、桩筏基础、井壁各部分的实际内力与实际情况有差别，结果造成设计偏于不安全或偏于浪费，造成经济上的损失。据此有必要将上部结构（井塔）、桩筏基础、地基和井壁四者作为一个整体进行研究，分析四者发生共同承载时各部分之间受力的特点，以优化井塔、桩筏基础、井壁的设计，使设计的筏板厚度、桩的直径和长度、井壁的厚度既能满足工程安全可靠的要求，又能达到节省材料的目的。 本文将上部结构（井塔）、桩筏基础、地基、井壁四者看成一个共同承载的完整系统，用共同作用分析方法对该系统进行分析。采用子结构分析方法，对上部结构、筏基、桩和地基所组成的体系进行分析，先将整个结构分割成若干个子结构，然后按照规定的顺序进行各个子结构刚度和荷载的凝聚，从而实现整个上部结构的刚度和荷载向桩筏基础的筏板的凝聚，最后把桩和地基作为桩一土体系的整体来分析，建立桩土支承体系的支承刚度矩阵，进而求出上部结构（井塔）、桩筏基础、地基共同作用的基本方程。通过将上部结构刚度和上部结构荷载凝聚叠加到桩筏基础的筏板上，同时假设井塔桩筏基础对井壁的某一影响深度，对井壁－桩－土支承体系相互影响和基础筏板的分析，就可得到上部结构－井壁－桩筏系统共同作用的位移方程。地基采用Drucker-Prage模型，桩土界面采用面－面接触单元处理，桩筏基础筏板采用厚板理论分析，通过建立结构模型，用数值计算的方法对竖向荷载作用下的井塔、桩筏基础、地基和井壁组成的体系进行了三维有限元分析。 分析结果表明桩筏基础筏板顶部的竖向最大位移值与实测值相符合；桩筏基础在“回”字型筏板的四个内角处和桩基与筏板连接处出现应力集中现象，这是由于截面的变化所致；井壁上的拉、压应力最大值出现在井壁底部，侧壁应力从下到上逐渐减小。用数值模拟分析考虑四者共同承载的桩筏基础的竖向位移最大值与沉降观测实测最大值是相符合的，证明了将井塔、桩筏基础、地基和井壁四者作为一个共同承载的整体分析是可行和必要的。

Mine shaft tower structure system consists of superstructure (shaft tower), pile-raft foundations, foundation soil and sidewall, which are jointed load-bearing and influenced each other in outside loading action. But the traditional designing method adopted in engineering field regards the superstructure (shaft tower), pile-raft foundations and foundation soil respectively and calculates them separately. And the joint load-bearing character of pile-raft foundations and sidewall will not be considered. Disregarding the joint load-bearing between them, also disregarding the difference among them could make the internal forces of the superstructure, pile-raft foundations and sidewall not conform to the reality, and the result of the designing method becomes either unsafe or wasted, and leads to economic loss. So it is necessary to study the superstructure (shaft tower), pile-raft foundations, foundation soil and sidewall as a whole.Analysis the characteristic force among the four parts when they joint load-bearing.Optimize shaft tower, pile-raft foundations, and sidewall design. Designed so that the thickness of the raft, the pile diameter and length and the sidewall thickness can meet the requirements of safety and reliably, and can achieve the purpose of saving materials. In this paper, superstructure (shaft tower), pile-raft foundations, foundation soil and sidewall regarded as joint load-bearing of entire system, and we analyze their system with interactive analysis theory. Adopting sub-structure method, analysis the system which consists of superstructure, raft foundations, pile and foundation soil, first the entire structure is separated into a number of sub-structure, and then in accordance with the order of the various sub-structural rigidity and load to agglomerate, thereby realize the entire superstructure of the rigidity and load agglomerate to the raft foundation. Finally regard pile and foundation soil as a pile-soil system and analysis, establish the pile-soil supporting of the bearing system rigidity matrix, then calculated the interaction basic equation of superstructure (shaft tower), pile-raft foundations and foundation soil. By agglomerating and superimposing superstructure rigidity and load to the pile-raft foundations raft-board. At the same time, assume the depth that shaft tower pile-raft foundations impact side wall. Analysis the bearing system of sidewall-pile-soil interaction and raft foundition, then get the interactive displacement equation of the superstructure-sidewall-piled raft system.Foundation soil was adopted the Drucker-Prage subsoil model, pile-soil interface adopt the side to side contact element to treaty, pile-raft foundations adopt thick-plate theory to analysis, establish a structural model. Research it with numerical calculation method, the three-dimensional finite element analysis for shaft tower, pile-raft foundation, foundation soil and sidewall which under vertical load. Analysis shows that pile-raft foundations raft top of the maximum vertical displacement values consistent with the measured values；Pile-raft foundations in the "return" of the four fonts raft interior angle and the pile foundation with a raft connecting the stress concentration, which is due to the changes in section；The maximum tension stress and compressive resistance on the sidewall in the bottom of the sidewall .and gradually reduced from the bottom to the top of sidewall .Consider the four parts joint load-bearing when use numerical value to simulate the pile-raft foundations of the maximum vertical displacement value combined with the measured maximum value proved that the shaft tower, pile-raft foundation, the foundation soil and sidewall as a joint load-bearing whole role to analysis is feasible and necessary.